Titanium Monoxide Research Articles

Anisotropy of elastic properties of disordered cubic titanium monoxide TiOy

For the first time, the elastic constants c11, c12, and c44 of disordered cubic titanium monoxide TiOy were determined depending on the oxygen content y in the homogeneity region from TiO0.80 to TiO1.25. It has been established that the values of the elastic moduli depend on the oxygen content y and the crystallographic direction [hkl ]. Large changes in the elastic characteristics of TiOy depending on the [hkl ] direction indicate a strong anisotropy of the elasticity of disordered cubic titanium monoxide.

STUDY OF THE INFLUENCE OF PLASMA-ELECTROLYTICE OXIDATION PARAMETERS ON THE FUNCTIONAL PROPERTIES OF HETEROXIDE COATINGS

The results of a study of the influence of the parameters of plasma-electrolytic oxidation in diphosphate electrolyte solutions of metal platforms made of titanium alloys, as the basis for the formation of heterooxide coatings with photocatalytic activity, on the level of their functional properties are presented. It has been established that heterooxide coatings obtained in PEO modes on titanium alloy platforms, in which zinc and tungsten compounds were incorporated as dopants, demonstrate photocatalytic activity in the processes of azo dye degradation under UV irradiation. An increase in the concentration of oxygen-containing compounds of dopants in electrolyte solutions has a positive effect on their incorporation into the composition of the monoxide matrix of the composite, morphology and catalytic properties of the obtained coatings. Based on the results of determining the morphological features of the structure of the coatings, it was proved that, compared with titanium monoxide, as a material for a photocatalytic platform, heterooxide coatings have a more developed globular surface microstructure, which positively affects the level of their functional performance. A symbatic dependence between the content of incorporated dopants and the specific surface area of coatings, as well as their photocatalytic activity, has been proven. It is noted that the change in the phase structure of the surface layers in the process of plasma-electrolytic formation of the TiO/ZnO-WO3 coating on the surface of the carrier metal causes an increase in the mechanical characteristics of the resulting coatings, in particular, the microhardness almost doubles. The obtained results can become the basis for the creation of functional materials for the catalytic neutralization of natural, synthetic and man-made toxicants, which will lead to the solution of a number of environmental problems both during the war crisis and during the post-war reconstruction of the country.

Functional Laminated Fiber Scaffold Based on Titanium Monoxide for Lithium Metal-Based Batteries.

Lithium metal-based rechargeable batteries are attracting increasing attention due to their high theoretical specific capacity and energy density. However, the dendrite growth leads to short circuits or even explosions and rapid depletion of active materials and electrolytes. Here, a functionalized and laminated scaffold (PVDF/TiO@C fiber) based on lithiophilic titanium monoxide is rationally designed to inhibit dendrite growth. Specifically, the bottom TiO@C fiber sublayer provides rich Li nucleation sites and facilitates the formation of stable solid electrolyte interphase. Together with the top lithiophobic PVDF sublayer, the prepared freestanding scaffold can effectively suppress the growth of Li dendrite and ensure stable Li plating/stripping. Based on the dendrite-free deposition, the Li/PVDF/TiO@ C fiber anode enables over 1000h at a current density of 1mA cm-2 in a symmetrical cell and delivers superior electrochemical performance in both Li || LFP and Li-S batteries. The functional laminated fiber scaffold design provides essential insights for obtaining high-performance lithium metal anodes.

Preparation and characterization of wear resistant TiO layer on Ti alloy

Titanium monoxide (TiO) is golden in color, and of good chemical inertness and high hardness, making it a potential candidate for decorative and protective coatings. In this study, a TiO layer was coated on Ti alloy substrate through a combination of cathode plasma electrolysis (CPE) and comproportionation between the Ti substrate and Ti4+ from the electrolyte. The thickness of the obtained TiO layer was around 500 nm, with a hardness of 11 GPa, a modulus of 220 GPa and a critical load of 55 N. The coefficient of friction of the CPE-treated sample vs. ZrO2 ball was decreased from 0.4 to 0.6 to around 0.2 when the Hertz pressure was less than 885 MPa. The wear rate of the CPE-treated sample was reduced by ~450 times compared with that of the untreated Ti alloy. Correspondingly, the wear rate of the ZrO2 ball was reduced by ~170 times. In addition, wear resistance of the CPE-treated samples was also significantly improved for common metallic materials (such as stainless steel, carbon steel, or copper alloy) as the counterpart. The surface morphology evolution and the mechanical properties of the TiO layer can avoid the severe abrasive wear as well as adhesive wear, and contribute to the excellent antiwear effects. CPE demonstrates a technologically relevant capability, especially in forming a TiO antiwear layer on Ti alloy.

Application of nitrogen-doped graphene-supported titanium monoxide as a highly active catalytic precursor to improve the hydrogen storage properties of MgH2

MgH2 has broad prospects in energy storage applications; however, its poor thermodynamic properties and slow hydrogen absorption and desorption rates are unsuitable for commercial needs. In the present work, TiO@N-C (denoted as TTONC), a highly active catalytic precursor, was employed to improve the hydrogen storage properties of MgH2. The TTONC-catalyzed MgH2 could uptake hydrogen at room temperature, and the onset dehydrogenation temperature of TTONC-catalyzed MgH2 was 94 °C lower than that of pristine MgH2 (∼300 °C). Dehydrogenated TTONC-catalyzed MgH2 had a capacity retention rate of 95.2% after 50 hydrogen absorption-desorption cycles. The dehydrogenation and hydrogenation apparent activation energies of MgH2-TTONC were 90.5 kJ.mol−1 and 52.7 kJ.mol−1, respectively. The catalytic mechanism analysis revealed that the in situ formed Ti generated TiH2 in the hydrogenation process, and Ti/TiH2 acted as a hydrogen pump to diffuse hydrogen atoms in the hydrogen absorption/desorption process. The formation of stable CN layers with carbon structural defects on the surface of MgH2 inhibited the fragmentation and agglomeration of MgH2 particles, and they served as nucleation sites to enhance hydrogen diffusion. Hence, the dehydrogenation/hydrogenation properties and cyclic stability of MgH2 were greatly enhanced by the addition of TTONC.

Minimizing catalyst amount in sulfur cathodes with titanium monoxide: Toward more applicable Li-sulfur batteries

Using economical oxide catalysts into sulfur (S8) cathodes proves an efficient way to address kinetic issues in Li-sulfur batteries (LSBs). However, these catalysts often occupy too much proportion in weight, thus attenuating the cathode gravimetric energy density. Also, they tend to be sulfurized/ deteriorated in electrode fabrication or battery cycling. To overcome above constraints, we herein propose to minimize the catalyst amount in S8 cathodes with titanium monoxide (TiO) nanoclusters. In such configured cathodes, there are only ∼ 1.47 % of TiO nano catalysts in weight; such oxides with rich (200) facet prove efficient kinetic-boosting properties on Li2Sn phase conversions. Notably, they exhibit prominent electrochemical stability over all cyclic periods, without evident sulfuration or phase deteriorations. The in-situ Raman monitoring toward LSBs reveals the liquid-to-solid polysulfide transitions can be well accelerated even under lean-catalyst conditions. As evaluated, the cathodes of S8 infused in lean TiO-involved carbon hosts (S8@L-TiO@CH) show a great specific capacity of 1331 mAh g−1 at 0.2 C, with a high capacity retention ratio of 78.5 % at the end of cycling. This work may guide a research trend to endow S8 cathodes with elevated viability/durability for practical usage.

Investigating the activation of passive metals by a combined in-situ AFM and Raman spectroscopy system: a focus on titanium

Understanding the main steps involved in the activation of passive metals is an extremely important subject in the mechanical and energy industry and generally in surface science. The titanium-H2SO4 system is particularly useful for this purpose, as the metal can either passivate or corrode depending on potential. Although several studies tried to hypothesise the surface state of the electrode, there is no general consensus about the surface state of Ti in the active–passive transition region. Here by combining in-situ atomic force microscopy (AFM) and Raman spectroscopy, operating in an electrochemical cell, we show that the cathodic electrification of Ti electrodes causes the dissolution of the upper TiO2 portion of the passive film leaving the electrode covered by only a thin layer of titanium monoxide. Fast anodic reactions involved the acidification of the solution and accumulation of sulphur containing anions. This produces a local increase of the solution turbidity, allowing to distinguish favourable regions for the precipitation of TiOSO4·2H2O. These results give a clear answer to the long-stated question of the physical origin behind the formation of negative polarization resistances, sometimes occurring in corroding systems, and a rationale about the proton-induced degradation of passive surfaces in presence of sulphur containing species.

Preparation and electrical transport properties of TiO thin films

Titanium monoxide has attracted great attention due to its unique superconducting characteristics and potential applications in microelectronics. In this work, a series of TiO thin films are prepared at room temperature by using the radio frequency magnetron sputtering method through changing the oxygen partial pressures. The crystal structures, valences of the elements, and electrical transport properties of the films are investigated systematically. X-ray diffraction results indicate that the films are epitaxially grown on MgO single crystal substrates along the [001] direction. After the surface of the TiO film is treated by ion etching, it is found that the Ti element mainly exists in a divalent form. For all films, the temperature coefficients of resistance are negative above superconducting transition temperature <i>T</i><sub>c</sub>. The films prepared under high oxygen partial pressures reveal insulator characteristics, and the temperature dependence of resistivity obeys the Mott-type variable-range-hopping law in low temperature regime. The films prepared under low oxygen partial pressures exhibit metallic properties, and enter into a superconducting state at low temperature. The superconducting transition temperature <i>T</i><sub>c</sub> in our film can be as high as 3.05 K. The carrier concentrations of the films are in the vicinity of ~2.0×10<sup>22</sup> cm<sup>–3</sup>, which is comparable to those for the typical metals. Interestingly, it is found that the main species of the charge carriers in the films transforms from electrons to holes with the oxygen partial pressure decreasing. The crossover of the species of the charge carriers could related to the changing of energy-band structure with the oxygen content in TiO film.

Two-dimensional TiO nanosheets with photothermal effects for wound sterilization.

To combat multidrug-resistant bacteria, researchers have poured into the development and design of antimicrobial agents. Here, low-cost two-dimensional (2D) antibacterial material titanium monoxide nanosheets (TiO NSs) were prepared by an ultrasonic-assisted liquid-phase exfoliation method. When cultured with bacteria, TiO NSs showed intrinsic antimicrobial capacity, possibly due to membrane damage caused by the sharp edges of TiO NSs. Under near-infrared (NIR) laser irradiation, TiO NSs showed high photothermal conversion efficiency (PTCE) and sterilization efficiency. By combining these two antibacterial mechanisms, TiO NSs exhibited a strong killing effect on Gram-negative Escherichia coli (E. coli) and Gram-positive methicillin-resistant Staphylococcus aureus (MRSA). Especially after treatment with TiO NSs (150 μg mL-1) +near-infrared (NIR) light irradiation, both bacteria were completely killed. In vivo experiments on wound repair of bacterial infection further confirmed its antibacterial effect. In addition, TiO NSs had no obvious toxicity or side effects, so as a kind of broad-spectrum 2D antibacterial nanoagent, TiO NSs have broad application prospects in the field of pathogen infection.

Design and Characterization of Nanostructured Titanium Monoxide Films Decorated with Polyaniline Species

The fabrication of nanostructured composite materials is an active field of materials chemistry. However, the ensembles of nanostructured titanium monoxide and suboxide species decorated with polyaniline (PANI) species have not been deeply investigated up to now. In this study, such composites were formed on both hydrothermally oxidized and anodized Ti substrates via oxidative polymerization of aniline. In this way, highly porous nanotube-shaped titanium dioxide (TiO2) and nano leaflet-shaped titanium monoxide (TiOx) species films loaded with electrically conductive PANI in an emeraldine salt form were designed. Apart from compositional and structural characterization with Field Emission Scanning Electron Microscopy (FESEM) and Raman techniques, the electrochemical properties were identified for each layer using cyclic voltammetry and electrochemical impedance spectroscopy (EIS). Based on the experimentally determined EIS parameters, it is envisaged that TiO-based nanomaterials decorated with PANI could find prospective applications in supercapacitors and biosensing.

Conductive oxide support design and synergistic engineering of bimetallic high-performance electrocatalyst for oxygen reduction reaction

The exploration of oxygen reduction reaction (ORR) catalysts with high electrochemical activity and durability is vital for many energy conversion systems. Herein, an efficient ORR electrocatalyst consisting of highly active Co/W bimetallic nanoclusters supported by conductive and robust N-doped titanium monoxide with three-dimensional ordered macroporous architecture (3DOM Co/W@N-TiO) was developed. The 3DOM N-TiO support with rich oxygen vacancies not only offers a high surface area and conductivity but also facilitates the anchoring of Co/W nanoclusters via strong metal-support interaction, endowing the catalysts with excellent catalytic activity and durability performance. Density functional theory calculations demonstrate that there exists a synthetic effect between the binary Co/W nanocluster, which was originated from electron transfer between W and Co, promoting the ORR kinetics and thermodynamics. Benefited from these features, the catalyst displays excellent ORR performance with a half-wave potential (E1/2) of 0.84 V vs. RHE, competitive with that of benchmark Pt/C. The 3DOM Co/W@N-TiO powered zinc-air batteries achieve high power density of 168 mW cm−2 and specific capacity of 792 mAh g−1 exceeding that driven by Pt/C. This work provides an effective strategy for the development of efficient and durable ORR catalysts through conductive oxide support design and the synergistic engineering of binary metals, demonstrating its promising potentials in energy conversion systems.

Thermodynamic Analysis of Stoichiometric Composition Changes in the TixOy Films at RF Magnetron Sputtering and Modeling of Their Conductivity

Herein, the results of experiments on the synthesis of nonstoichiometric titanium oxide films by magnetron sputtering at various partial oxygen pressures and discharge powers are presented. The thermodynamic analysis of the synthesis results is performed by minimizing the Gibbs free energy of the equilibrium thermodynamic system, which takes place in the chamber. The dependences of the concentration of the main components in the deposition chamber on the partial pressure of oxygen and the discharge power, including the concentration of synthesized titanium monoxide and dioxide, are obtained. The analysis of these dependences allows determining the conditions for the critical values of the partial pressures of oxygen at which the oxides are synthesized. The exponential dependence of the conductivity on oxygen pressure is found experimentally and explained on the basis of hopping conductivity over the states of defects on the surface of nanocrystals that form the synthesized films.

Heating-Induced Transformation of Anatase TiO2 Nanorods into Rock-Salt TiO Nanoparticles: Implications for Photocatalytic and Gas-Sensing Applications.

Anatase TiO2 nanocrystals (NCs) play a vital role in photocatalytic applications due to their high catalytic activity and in gas-sensing applications due to their high chemical sensitivity. Here, we report the transformation at elevated temperature of anatase nanorods (NRs) with a length of 25 nm into rock-salt TiO nanoparticles with an average size of 9.2 ± 2.1 nm investigated by means of in situ heating in the transmission electron microscope. The NRs were completely transformed to titanium monoxide NCs after heating to a temperature of 1200 °C. We also identified an intermediate stage in the temperature range of 950–1200 °C, during which not only the anatase and rock-salt phases were found but also the brookite phase. Understanding of the phase and morphology evolution at high temperatures is of essence to the functionality of the NRs in various applications, as discussed in this work. Moreover, the high-temperature transformation to titanium monoxide is of interest as rock-salt TiO (γ-TiO) is known to exhibit superconducting properties. We propose the heating-induced transformation as a physical route to synthesize TiO NCs of very small size.

Placing of hydrogen in titanium oxyhydride

Possible models of the arrangement of hydrogen atoms at the sites of the cubic lattice of titanium oxyhydride TiOyHp with vacancies in the metallic and nonmetallic sublattices are considered. It was found that titanium oxyhydride retains the B1 type crystal lattice of the initial cubic titanium monoxide TiOy and contains structural vacancies in the metal and oxygen sublattices. Comparison of the found analytical expressions for the intensity of diffraction reflections with experimental X-ray and neutron diffraction data showed that interstitial H atoms in oxyhydrides occupy vacant octahedral positions 4( b) of the oxygen sublattice. No displacement of H atoms in tetrahedral positions 8( c) is observed. A disorder-order phase transition channel associated with the formation of an ordered monoclinic titanium oxyhydride of the Ti5O5 type was found. The distribution functions of Ti, O, and H atoms in the partially ordered monoclinic oxyhydride Ti5.33O5.12H0.74 (Ti0.89O0.85H0.12) with a Ti5O5-type structure are calculated for the first time, and the concentrations of these atoms at the positions of its lattice were found. Keywords:Titanium monoxide, Hydrogen, Nonstoichiometry, Vacancies, Octahedral and tetrahedral positions, Distribution function.

A novel route of colloidal chemistry: room temperature reactive interactions between titanium monoxide and silicon monoxide sols produced by laser ablation in liquid resulting in the formation of titanium disilicide

In spite of advanced research on functional colloidal inorganic nanoparticles and their reactivity, room temperature reactive interactions between two different colloids have remained challenging so far. Laser ablation of titanium monoxide and silicon monoxide in ethanol and water allows the generation of TiO-derived and SiO-derived colloidal nanoparticles which were characterized for their stability, size distribution and zeta potentials with dynamic light scattering and after evaporation of solvent examined for their morphology, chemical and phase composition by scanning electron microscopy, Raman spectroscopy, high resolution transmission electron microscopy and electron diffraction and small angle X-ray scattering. Aqueous and ethanolic TiO-derived colloids consist of anatase and monoclinic TiO, while ethanolic SiO-derived colloids are composed of crystalline and amorphous Si, nanocrystalline Si and SiO2 and aqueous SiO-derived colloids contain, in addition to these phases, a high pressure form of cristobalite. Simple room temperature mixing of ethanolic TiO- and SiO-derived colloids allows the formation of TiSi2, which is a case of so far unreported room temperature reactive interactions between two colloidal species. All colloids absorb solar light and act as photocatalysts for methylene blue degradation. These findings present a challenge for further search for feasible room-temperature reactions between distinct colloidal particles and open the potential for green synthesis of other desirable and hardly achievable phases.

In situ synchrotron Х-ray diffraction study of heat-induced structural changes in TiOy/HAp nanocomposites

In situ synchrotron Х-ray diffraction (XRD) was used to study the interactions between an important biomaterial for tissue engineering and regenerative medicine, hydroxyapatite, and titanium monoxide additives of different stoichiometry, in nanocomposite materials. The study was carried out in the temperature range from ambient to 900 °C in a flow of dry air. During the temperature evolution of the nanocomposites, the mutual influences of the matrix and additives were observed. The dynamics of changes in the phase composition and the effects of TiOy on the thermal stability of the matrix were considered. The addition of 10 wt% TiOy increased the decomposition temperature of HAp by approximately 100 °C. Different additive stoichiometries shifted the temperature ranges of the phase transitions in the nanocomposites. Opposite trends were observed for the dependence of the weight content of the matrix and that of the additive on temperature in the range from 300 to 800 °C. This behaviour was explained by a partial substitution of Ti atoms for Ca atoms. After heat treatment to 900 °C, all nanocomposite phases were biocompatible. The oxyapatite and TiO2 phases retained the nanostates of their initial components, while the α- and β-ТСР phases were microcrystalline. In situ synchrotron XRD method proved to be a highly informative and precise technique for studying new biomaterials.

Размещение водорода в оксигидриде титана

Possible models of the arrangement of hydrogen atoms at the sites of the cubic lattice of titanium oxyhydride TiOyHp with vacancies in the metallic and nonmetallic sublattices are considered. It was found that titanium oxyhydride retains the B1 type crystal lattice of the initial cubic titanium monoxide TiOy and contains structural vacancies in the metal and oxygen sublattices. Comparison of the found analytical expressions for the intensity of diffraction reflections with experimental X-ray and neutron diffraction data showed that interstitial H atoms in oxyhydrides occupy vacant octahedral positions 4(b) of the oxygen sublattice. No displacement of H atoms in tetrahedral positions 8(c) is observed. A disorder-order phase transition channel associated with the formation of an ordered monoclinic titanium oxyhydride of the Ti5O5 type was found. The distribution functions of Ti, O, and H atoms in the partially ordered monoclinic oxyhydride Ti5.33O5.12H0.74 (Ti0.89O0.85H0.12) with a Ti5O5-type structure are calculated for the first time, and the concentrations of these atoms at the positions of its lattice were found.

Combined Spectroscopic and Computational Investigation on the Oxidation of exo-Tetrahydrodicyclopentadiene (JP-10; C10H16) Doped with Titanium-Aluminum-Boron Reactive Metal Nanopowder.

We report the results on the combustion of single, levitated droplets of exo-tetrahydrodicyclopentadiene (JP-10) doped with titanium-aluminum-boron (Ti-Al-B) reactive metal nanopowders (RMNPs) in an oxygen (60%)-argon (40%) atmosphere by exploiting an ultrasonic levitator with droplets ignited by a carbon dioxide laser. Ultraviolet-visible (UV-vis) emission spectroscopy revealed the presence of gas-phase aluminum (Al) and titanium (Ti) atoms. These atoms can be oxidized in the gas phase by molecular oxygen to form spectroscopically detected aluminum monoxide (AlO) and titanium monoxide (TiO) transients. Analysis of the optical ignition videos supports that the nanoparticles are ignited before JP-10. The detection of boron monoxide (BO) further proposes an active surface chemistry through the oxidation of the RMNPs and the release of at least BO into the gas phase. The oxidation of gas-phase BO by molecular oxygen to boron dioxide (BO2) plus atomic oxygen might operate in the gas phase, although the involvement of surface oxidation processes of RMNPs to BO2 cannot be discounted. The UV-vis emission spectra also revealed the key reactive intermediates (OH, CH, C2, and HCO) of the oxidation of JP-10. Electronic structure calculations reveal that the presence of reactive radicals has a profound impact on the oxidation of JP-10. Although titanium monoxide (TiO) reacts to produce titanium dioxide (TiO2), it does not engage in an active JP-10 chemistry as all abstraction pathways are endoergic by more than 217 kJ mol-1. This is similar for atomic aluminum and titanium, whose hydrogen abstraction reactions from JP-10 were revealed to be endoergic by at least 77 kJ mol-1. Therefore, aluminum and titanium react preferentially with molecular oxygen to produce their monoxides. However, the formation of BO, AlO, and BO2 supplies a pool of highly reactive radicals, which can abstract hydrogen from JP-10 via transition states ranging from only 1 to 5 kJ mol-1 above the separated reactants, forming JP-10 radicals along with the hydrogen abstraction products (boron hydride oxide, aluminum monohydroxide, and metaboric acid) in the overall exoergic reactions. These abstraction barriers are well below the barriers of abstractions for ground-state atomic oxygen and molecular oxygen. In this sense, gas-phase BO, AlO, and BO2 catalyze the oxidation of gas-phase JP-10 via hydrogen abstraction, forming highly reactive JP-10 radicals. Overall, the addition of RMNPs to JP-10 not only provides a higher energy density fuel but is also expected to lead to shorter ignition delays compared to pure JP-10 due to the highly reactive pool of radicals (BO, AlO, and BO2) formed in the initial stage of the oxidation process.

Enhancing Hydrogen Evolution by Optimizing the Hydrogen Adsorption on Titanium Monoxide Nanodot‐Decorated Cobalt Sulfide Nanosheets

AbstractModulating the local electronic state of metal compounds through interfacial interaction has become a key method for manufacturing high‐performance hydrogen evolution reaction (HER) electrocatalysts. The electron‐rich active sites can promote the adsorption of hydrogen, which accelerates the Volmer step and thereby enhances the electrocatalytic performance of HER. Here, we found that the strong interfacial interaction between TiO nanodots (TiO/Co−S) and Co−S nanosheets could advantageously improve the performance toward HER of electrocatalyst. Meanwhile, XPS results showed that modulating the local electronic structure of the TiO nanodots produces electron‐rich regions on Co. As a result, the overpotential of the TiO/Co−S nanocomposite at 10 mA cm−2 was 107 mV, and the Tafel slope was 83.3 mV dec−1. This study focused on the effect of the solid‐solid interface on the local electronic structure of the catalytic metal active sites and successfully improved the catalytic activity of transition metal materials in HER catalysis.

Photocatalytic activity of oxide systems based on doped d-elements of titanium alloys

CO-, W-, MO- and Zn-containing hetero-oxide nanostructured coatings on titanium and its alloys formed by plasma-electrolyte oxidation in galvanostatic mode from alkaline electrolytes were investigated. The morphology of the surface of the formed coatings was studied by scanning microscopy on the Zeiss Evo 40XVP microscope. The phase composition of the obtained coatings was determined on the X-ray diffractometer Drone-2. Photocatalytic activity of ZnO-WO3/TiO2 films, ZnO-MOO3/TIO2, ZnO-Co3O4/TiO2, CoO-WO3/TiO2 tested in a model reaction of decomposition of an aqueous solution of azobye with a concentration of 12,2·10-5 mol/L (MО) at UV irradiation. It is shown that with plasma-electrolyte oxidation of titanium and its alloys in alkaline diphosphate electrolytes in the mode of «drop-down power» forming heterostructural composites with micro-globular surface morphology. The possibility of controlling the phase and elemental composition of oxide layers, as well as the topography of the surface by changing the composition of the electrolyte and the content of individual components, as well as the modes of formation is confirmed. Heteroxide coatings formed in PEO modes differ in composition and surface morphology, but all exhibit photocatalytic properties of varying degrees of activity. The study of the photocatalytic activity of the obtained coatings in the azo dye decomposition reaction by means of UV testing allowed to rank the heteroxide systems according to the specified parameter. Thus, the degree of decomposition of MF on ZnO-WO3/TiO2 films in 50 minutes was 23 %. Metal oxide systems ZnO-Co3O4/TiO2 had similar characteristics of the degree of decomposition – 21 %. The incorporation of CoO and WO3 oxides into the coating composition reduced the catalytic activity of the system to 19 %. The unstable mode of formation of ZnO-MoO3/TiO2 oxides and the low speed of the process have affected the quality of the catalytic coating activity, reduced the degree of decomposition of MO to values of titanium monoxide Ti/TiO2 without dopants. Comparison of quantitative characteristics of the properties of the obtained coatings allowed to determine the effects of dopants, incorporated into metal oxide systems, on their photocatalytic activity.