Perovskite Titanate Research Articles

Microwave-Driven Reduction Accelerates Oxygen Exchange in Perovskite Oxides.

Microwave-assisted oxide reduction has emerged as a promising method to electrify chemical looping processes for renewable hydrogen production. Moreover, these thermochemical cycles can be used for thermochemical air separation, electrifying the O2 generation by applying microwaves in the reduction step. This approach offers an alternative to conventional cryogenic air separation, producing pure streams of O2 and N2. The electrification by microwaves lowers the requirements for titanate perovskites (CaTi1-xMnxO3-δ), which typically demand high temperatures for thermochemical cycles. Microwave activation allows for a drastic reduction in the operation conditions of the reduction reaction, leading to unprecedentedly rapid absorption-desorption cycles (<3 min per cycle). For CaTi0.8Mn0.2O3-δ, we achieved a cycle-averaged O2 production of 2.6 mL g-1 min-1 at 800 °C, surpassing conventional values of materials operating in the high-temperature regime. This method could significantly impact thermochemical air separation by enabling a faster oxygen absorption-desorption cycle at more moderate temperatures than those of conventionally heated processes.

Mixed Perovskite Phases of BaTiO3/BaTi5O11 for Efficient Electrochemical Reduction of CO2 to CO.

One of the most promising approaches in solving the energy crisis and reducing atmospheric CO2 emissions is artificial photosynthetic CO2 reduction. The electrochemical method for CO2 reduction is more appealing since it can be operated under ambient conditions, and the product selectivity strongly depends on the applied potential. Perovskites with ferroelectric properties strongly adsorb linear CO2 molecules. In this study, barium titanate (BaTiO3) perovskite is used as an electrocatalyst to promote CO2 activation and conversion to CO. Perovskite catalysts were prepared by ball-milling followed by annealing at 900 °C for 4 to 6 h in an open atmosphere. The TEM and SEM study shows that the particle size varies in the range of 80-200 nm. Mixed phases of BaTiO3 and BaTi5O11 supported on nitrogen-doped carbon nanotubes are found to be highly active for electrocatalytic CO2 reduction to CO with maximum Faradaic efficiency of 89.4 % at -1.0 V versus Ag/AgCl in CO2 saturated 0.5 KOH solution. This study concludes that mixed phases of BaTiO3 and BaTi5O11 are more active and highly selective for CO2 conversion to CO compared to single-phase BaTiO3.

Correlation-induced generation of superharmonics in the high-order harmonic spectrum of perovskite barium titanate

Correlation-induced generation of superharmonics in the high-order harmonic spectrum of perovskite barium titanate

Exploring the Role of Titanate Perovskites in the Oxidation of Amines to Imines via Photocatalysis.

Considering that structural differences could affect the photocatalytic efficiency of titanate perovskites, cubic SrTiO3 (STO) and tetragonal CaTiO3 (CTO) were synthesised as models to elucidate the structure-activity relationship. STO and CTO materials were produced through hydrothermal approaches, adjusting parameters such as temperature and pressure to optimise material purity. Among the perovskite photocatalysts, two stand out for their exceptional photocatalytic capacity and crystalline purity: CaTiO3, prepared at 180 ºC for 36 h, and SrTiO3, synthesised at 200 ºC for 24 h. Notably, we explore the selective ability of these materials for the photocatalytic oxidative self-coupling of benzylamine (BZA) to produce N-benzylidenebenzylamine (BZI), with CaTiO3 emerging as the most efficient catalyst for this reaction. The CTO material prepared at 180 ºC for 36 h (CTO180T-36) achieved a peak BZI production of 0.5 mM, with a total conversion of BZA after 7 h of irradiation. This study also emphasises the crucial role of reaction conditions and perovskite morphologies in fine-tuning photocatalytic performance. These findings highlight opportunities for developing efficient and selective photocatalytic processes, holding the compromise for applications in organic synthesis and sustainable green chemistry.

Effect of spin coating speeds on electrical and optical characteristic of perovskite SrTiO3 thin films prepared by sol-gel method

The perovskite strontium titanate (SrTiO3/STO) was prepared by the sol-gel process, and the STO thin film was deposited onto a glass substrate by the spin coating method. Effect of different spin coating speeds on the thickness, structural, optical, and electrical properties of the STO thin films was discussed. Five STO films with various spin coating parameters of 2000, 4000, 6000, 8000, and 10000 RPM were prepared. Thickness profilometer tests have shown that the thickness of the STO film changes from 802 nm at 10000 RPM to 1321 nm at 2000 RPM spin coating speed. The prepared STO films morphology was examined by scanning electron microscope. X-ray diffraction measurements have shown that crystalline STO films have been produced with a cubic perovskite structure. The optical properties of the prepared STO films were investigated using an ultraviolet visible spectrophotometer, and the results indicated that the STO film at 8000 and 4000 RPM spin speed show the lowest and the maximum optical band gap (2.83 and 2.90 eV, respectively). All STO films have absorption coefficient values higher than 103 cm−1. The prepared STO thin films had a refractive index between 2.40 and 2.42. The electrical characteristics of the prepared STO films were investigated using the four-point probe method, and it was found that as the spin coating speed increased from 2000 to 8000 RPM, the resistivity of the STO films reduced from 6.629∗1010 to 3.009∗1010 Ω. Moreover, the STO film at 8000 RPM spin speed has the best electrical conductivity (3.301∗10−5 S m−1).

Study on Titanate perovskites with different morphologies for oxygen-evolution reaction catalysts

Metal exsolution from perovskite oxides has been used to produce well-designed electro-catalysts where metal nanoparticles are homogeneously distributed on the surface of perovskites. Our previous works revealed that the metal exsolution concept is effective not only for high-temperature system such as solid oxide fuel/electrolysis cells but also for alkaline water electrolysis at near-ambient temperatures. In this study, we prepare cuboidal and spherical Ni-doped CaTiO3 to investigate the effects of the different perovskite morphologies on Ni exsolution and catalytic activity for OER. Ni ions seem to be incorporated into the A-site of CaTiO3 with structural OH ions via solvothermal route, and the stoichiometry of spheres and cubes were confirmed as (Ca0.82Ni0.04)Ti1O2.63(OH)0.46 and (Ca0.90Ni0.04)Ti1O2.88(OH)0.12, respectively. The spheres show random distribution of Ni nanoparticles along grain boundaries, whereas Ni nanoparticles are ex-solved along the edges in the cubes. With the small amount of Ni contents (∼4 mol %), geometric current density of each cube and sphere exhibits comparable OER activities of ∼10 mA cm−2 and ∼7 mA cm−2 at 1.7 V to previously reported catalysts such as transition metals or perovskites. We suppose from Tafel slope that different A-site and oxygen stoichiometry of the CaTiO3 may affect deprotonation step during OER in terms of proton conduction.

Comprehensive analysis of structural, dielectric, and electrical properties of sol–gel synthesized Ba-doped bismuth ferric titanate perovskite nanoparticles

Comprehensive analysis of structural, dielectric, and electrical properties of sol–gel synthesized Ba-doped bismuth ferric titanate perovskite nanoparticles

Exploring the potential of perovskite structured SrTiO3 ceramics nanoparticles for developing SrTiO3 ceramics-decorated advanced Super-Wettable and photocatalytic self-cleaning membrane and its applications

There is a huge potential in developing robust, highly stable, and covalently crosslinked ceramics-decorated membranes that can be efficiently used for the treatment of oil-contaminated water. Hence, the current work was focused on developing a photo-active strontium titanate (SrTiO3) perovskite ceramics decorated highly stable membrane with photocatalytic self-cleaning, superoleophobic underwater and superhydrophilic in air features. The SrTiO3 perovskite structured ceramics were decorated in the active layer of the membranes through interfacial polymerization on a polyvinylidene difluoride (PVDF) ultrafiltrationsupport. For the sake of photoactive SrTiO3 ceramics nanoparticles to take part in the interfacial polymerization, the SrTiO3 ceramics nanoparticles were functionalized with amino silane using 3-aminopropyltriethoxysilane yielding amino-functionalize-SrTiO3 (F-SrTiO3). Ethylenediamine (EDA) was used as an additional amine for ensuring the suitable cross-linking of the polyamide (PA) network where isophthaloyl chloride (IPC) was used as a crosslinker. The resultant F-SrTiO3/PA@PVDF membrane was thoroughly investigated through several membrane characterization techniques confirming the existence of all the components in the membrane structure. When applied for separating the emulsified and surfactant stabilized oil from water, the F-SrTiO3/PA@PVDF membrane showed excellent separation efficiency reaching >99 % for an emulsion of 200 ppm with a permeance of 56 L m−2 h−1 bar−1. Moreover, the membrane showed an underwater superoleophobic (θO, W = 159.9°) nature owing to the presence of amide linkages and superhydrophilic F-SrTiO3 nanoparticles. These features lowered the evidence of membrane fouling and the photocatalytic self-cleaning potential of F-SrTiO3 resulted in removing the foulants from the membrane surface with a flux recovery of 95 % while keeping the separation efficiency intact. Hence, the current approach of covalently incorporating the photocatalytic, superhydrophilic F-SrTiO3 in the membrane active layer proved to be robust and can be readily scaled up and applied in real-life filtration conditions.

Preparation of Calcium Titanate Perovskite Compound, Optical and Structural Properties

In this work, we have successfully fabricated a calcium titanate perovskite compound. The resulting CaTiO3 compound was studied by preparing samples by compacting it in a powder state and using a Pousson device. The distance between the planes dhkl, Miller indices (hkl), degree of crystallinity and amorphism, structure and lattice parameters of the calcium titanate perovskite compound were determined using an X-ray diffractometer. Also, according to the results of FT-IR analysis, the formation of CaTiO3 perovskite is confirmed as a result of the study of molecular vibrations. The main broad peaks are observed in the range of 680÷400 cm-1, the absorption band at the wave number of 543,93 cm-1 corresponds to the specific stretching vibrations of Ti-O bonds and indicates the formation of the CaTiO3 perovskite type structure implies. Based on the results of these measurements, it will be possible to use semiconductor compounds in the future to create nanofilms by magnetron sputtering.

Novel high-entropy perovskite titanate: A potential thermal protective material with improved thermophysical properties

High-entropy oxides (HEOs) have attracted considerable attention as potential materials for thermal protective coatings, which are driven by the growing demand for critical high-temperature components. Solid-phase reaction was used in the successful synthesis of Nonisotropic high-entropy titanate (La0.3K0.1Ca0.2Sr0.2Ba0.2)TiO3+δ thermal protective coating (TPC) material, whose mechanical and thermal properties were investigated via combined first-principles calculations and experimental methods. Notably, the coating material exhibited a higher thermal expansion coefficient (TEC) of 12.2 × 10−6 K−1 compared with other HEOs reported in the TPC field. Meanwhile, the prepared TPC material presented a prominent thermal insulation behavior with a low thermal conductivity of 1.46 W·m−1·K−1 at 1200 °C, and this condition was mainly attributed to multicomponent cation doping, which produces prevalent structural defects and lattice distortions that greatly enhance phonon scattering. First-principles calculations revealed the outstanding elastic anisotropy of (La0.3K0.1Ca0.2Sr0.2Ba0.2)TiO3+δ and its stronger resistance to microcrack extension compared with its single-component counterpart. The compound also showed good mechanical properties with a Vickers hardness of 11.5 GPa. The extraordinary thermo-mechanical properties achieved serve as a strong motivation for the pursuit of high-entropy approaches for the development of promising high-temperature TPC.

KNN composite ceramics with superior pyroelectric performance for self-powered thermal detector

The thermal detector based on pyroelectric effect has attracted widespread attention due to its self-powering and rapid response. Although phase boundary engineered lead-free potassium sodium niobate [K0.5Na0.5NbO3, KNN] based ferroelectrics exhibit promising for pyroelectric sensor application, the high dielectric constants (εr) of these materials significantly constrain their pyroelectric figures of merit (FOMs), owing to the inverse correlation between FOMs and εr. To address this problem, we innovatively introduce perovskite bismuth sodium titanate [Bi0.5Na0.5TiO3, BNT] with low εr and high pyroelectric coefficient as the second phase to construct a KNN/BNT composite. The introduction of BNT can not only remain the high pyroelectric coefficient (p=7.12 × 10−4 C m−2 K−1) of KNN matrix, but also result in superior FOMs (Fv increased by 74 %), outperforming previous KNN-based pyroelectric ceramics. The excellent pyroelectric performance originates from the unique composite microstructure with compositional heterogeneity. That is, both the low εr BNT enriched phase and refined grain size as well as the promoted vibration of Nb–O octahedron contribute to the superior pyroelectric performance. A self-powered thermal detector with great thermal response has been developed, which also exhibits potential for detecting ultraviolet energy and infrared radiation.

A-site-deficiency range identified for in situ exsolution from (La0.4Sr0.6)1-αTi0.95Ni0.05O3±δ electrodes for SOFC and SOEC.

Modulating the A-site deficiency is a useful method to achieve the exsolution of nanoparticles on the surface of perovskite, improving the catalytic activity. However, rules for designing the deficiency value and its roles on the structure and performance remain unclear. In this study, a wide range of A-site deficiencies of (La0.4Sr0.6)1-αTi0.95Ni0.05O3±δ (LSTN, α = 0.00, 0.13, 0.15, and 0.18) titanate perovskite materials was designed to systematically investigate their crystal structure, binding energy, oxygen vacancy concentration, exsolution process, and electrochemical performance. An extremely high conductivity (e.g., 331.75 S cm-1@800 °C, 5% H2/Ar) was obtained in parallel with enhanced catalytical activity in SOFC and SOEC modes. The A-site-deficient samples displayed a higher conductivity, oxygen vacancy concentration, and power output than the stoichiometric samples (α = 0.00). The best maximum power density of 78.74 mW cm-2 and the highest population density of 25 particles per μm2 were obtained on the deficient LSTN with α = 0.13. These findings suggest that LSTN is an exceptionally promising material for solid oxide cell (SOC) electrodes.

Ultrathin 2D/2D ZnIn2S4/La2Ti2O7 nanosheets with a Z-scheme heterojunction for enhanced photocatalytic hydrogen evolution.

Layered lanthanum titanate (La2Ti2O7) perovskite is a good photocatalytic material owing to its high stability, strong redox ability, and non-toxicity. However, its inherent wide bandgap limits its application in photocatalytic hydrogen evolution. Therefore, combining La2Ti2O7 with two-dimensional (2D) narrow-bandgap semiconductors to form 2D/2D layered structures is the preferred strategy to improve its photocatalytic performance. In this study, a novel 2D/2D ZnIn2S4/La2Ti2O7 Z-scheme heterojunction was prepared through a solvothermal method. The experimental results show that when the molar ratio of La2Ti2O7 to ZnIn2S4 is 1 : 4, the hydrogen evolution rate of the composite under ultraviolet-visible light reaches 6.97 mmol g-1 h-1, which is 3.5 times higher than that of the pure ZnIn2S4. The results of the morphological characterization studies of the samples and the photoelectrochemical measurements show that channels for the rapid transfer of carriers are generated by the unique 2D/2D structure of these samples, and the separation and migration efficiency of the photogenerated carriers significantly improved due to the formation of the Z-scheme heterojunction. This study provides useful insights into the modulation of wide-bandgap semiconductors and research into solar energy conversion.

Silver nanoparticles-promoted bismuth titanate perovskite nanosheets photocatalyst for water purification

Photocatalysis is a recognized approach in the detoxification of pollutants and in water splitting. Such process is more appealing when it is driven by visible or solar light. In this context, we synthesized bismuth titanate perovskite oxide (Bi4Ti3O12, BTO) photocatalyst by sol–gel hydrothermal process. The resulting BTO materials was affected by the titania source and by the synthesis medium pH parameter. Titanium butoxide [Ti(n-BuO)4] was much better than titanium isopropoxide [Ti(i-PrO)4] in producing regular nanosheets with higher surface area, while 75 ml of 5.0 M sodium hydroxide was the optimum concentration for the synthesis of regular, thin, porous, almost equal size nanosheets. The photocatalytic activity of BTO was improved by loading silver nanoparticles (AgNPs) by photo-assisted reduction. The optimum weight percent of loading AgNPs was found to be 1.5 % because it led to the highest light absorbance, the smallest band gap energy, the minimum rate of electron-hole recombination. The photocatalytic degradation efficiency of 1.5 wt% Ag/BTO reached as high as 99.0 % of rhodamine B (RhB, 100 ml, 6 ppm of initial concentration) under 70 min of irradiating visible light (>420 nm). Moreover, pH had a strong influence on the photocatalytic activity of 1.5 wt% Ag/BTO, with pH = 3.0 was the optimum, owing to its impact on the interaction between the positively-charged photocatalyst surface and the negatively-charged RhB molecules. It was found that superoxide radicals played key role in the photocatalytic activity.

Theoretical study of optoelectronic, elastic and mechanical properties of gallium modified barium titanate (Ba1-xGaxTiO3) perovskite ceramics by DFT

In this report, we study the gallium modified Barium titanate (Ga-BTO) Ba1-xGaxTiO3 with (x = 50 %) perovskite ceramics, which have not been synthesized experimentally to date. The density functional theory-based full potential linear augmented plane wave has been employed to determine the optoelectronic, elastic, and mechanical properties of pure and modified BaTiO3. Completely relaxed 2 × 2× 2 of primitive five atoms’ cells has been used for calculations. A large cut-off energy of 120 Ry has been used to eliminate the basics of plane wave-indicating wave functions. The influence of substitution of Ga on electronic structure and optical parameters such as reflectivity, refractivity, dielectric function, optical conductivity, extinction, and absorption coefficients are analyzed and elucidated with TDOS and PDOS. The Ga modified BTO manifests a forbidden energy gap of 1.84 eV. The static dielectric constant Ɛ1(o) has values of 8.8 and 100 for pure and modified compounds respectively. Ga dopant improved the polarizing power of BTO and for the doped BTO imaginary part, Ɛ2(ω)showed a prominent peak located at 3.9 eV. The optical properties show that perovskite compound substituted with Ga is a good absorber in the ultraviolet region and the modified material has a small value of reflectivity and static refractive index 12.2. The general profiles of optical spectra of modified BaTiO3 display highly desirable features like the prominent peaks of optical conductivity obtained at 4.2 and 5.8 eV for modified BTO that make it a promising candidate for optoelectronic and spintronics. Ga-modified BTO has higher ductility, modulus (169.96 GPa), and anisotropy (2.949) than pure BTO found by analyzing their elastic and mechanical properties.

Understanding the electronic structure and transport properties of A-site SrTiO3-δ ceramics with enhanced configuration entropy

Since SrTiO3 is attractive due to its versatile electronic properties ranging from dielectric to semiconducting behavior, the effect of systematic co-substitution of various A-site cations on the electronic structure and transport properties of oxygen-deficient SrTiO3-δ bulk ceramics was analyzed. The materials were synthesized by reverse co-precipitation method and densified by spark plasma sintering (SPS) in a vacuum, followed by a post-thermal treatment in a reducing atmosphere (5 % H2/Ar). The phase purity was confirmed by X-ray diffraction (XRD), different microstructures were revealed by scanning electron microscopy (SEM), and characterization in terms of electrical conductivity (σel) and Seebeck coefficient (S) were performed. The largest power factor was obtained with Sr0.25Ca0.25Na0.25La0.25TiO3-δ by maintaining electrical conductivity while increasing the Seebeck coefficient. Density Functional Theory (DFT) calculations were applied to obtain information on band structures, the projected density of states (PDOS), and electron density differences (EDD). Band structures indicated that oxygen deficiency essentially changed the conductive nature of the studied materials by shifting the Fermi level to the conductive zone, while PDOS plots define the role of each element located at the A site. The electronic structure is affected to the greatest extent in the cases when Nd and Pr are present at the A-site. However, the obtained experimental and computational (DFT) results could not completely match and explain all phenomena since understanding the effect of different cations at A-site on oxygen vacancy formation seems to be a challenging task, and therefore, some hypotheses are proposed. This work attempts to understand the role of a particular cation at A-site on the electronic band structure and its relevance to the formation of oxygen vacancies, thereby providing valuable insights for future high-entropy perovskite titanates with improved transport properties.

Experimental and DFT insights on hydrothermally synthesized PbS doped bismuth titanate perovskites: An Outperforming photocatalytic hydrogen production performance

In present study, bismuth-based titanate perovskite nanomaterials have been prepared by adapting hydrothermal technique assisted with low temperature. The band gap calculated from the Tauc plot by diffused reflectance UV–visible spectroscopy is 3.25eV. Lead sulfide nanoparticles were mixed in different weight ratios of 0.1%,0.3% and 0.6%, as a dopant to the bismuth titanate perovskites leading to a decrease in the bandwidth. The elemental composition was confirmed by XPS indicating the existence Bi and Ti further, detects the presence of oxygen species in more than one states which likely improves the photocatalytic characteristics. The photocatalytic action for breakdown of water was observed by a photochemical reactor using a Xenon lamp as a source of light and the experiment was performed in proximity of various hole-emulsifying agents. It was noticed that 0.6% PbS doped bismuth titanate (BT) reveals the highest hydrogen production of 202.43 μmol/g in the presence of EDTA and for generation of hydrogen, decreasing order of scavenger’s activity is Methanol > EDTA and TEOA for 0.6% PbS doped Bismuth titanates nanomaterials.Moreover, to achieve new and subtle insights in understanding the hydrogen adsorption phenomenon in the two selected composite models, DFT studies have been done. Since, the in-silico-based results (especially, the binding energy) provided evocative and interesting results (PbS side is more favorable than the Bi–O–Ti side for hydrogen production) which could be helpful for the experimentalists in smart fabrication of such fascinating materials employed for energy storage applications.

Cubic Na0.5Bi0.5TiO3nanoperovskite significantly expands the application of sensitive immunosensor for the detection of carcinoembryonic antigen.

Nanosized sodium bismuth perovskite titanate (NBT) was synthesized and first used as the electrochemical immune sensing platform for the sensitive detection of carcinoembryonic antigen (CEA). Gold nanoparticles (Au NPs) grew on the surface of NBT through forming Au-N bond to obtain Au@NBT, and a label-free electrochemical immunosensor was proposed using Au@NBT as an immunosensing recognizer towards CEA. The well-ordered crystal structure of NBT was not changed at all after the modification of Au NPs outside, but significantly improved the conductivity, catalytic activity, and biocompatibility of the Au@NBT-modified electrode. The unique cubic crystal nanostructure of NBT offered a large active area for both Au NP modification and the subsequent immobilization of biomolecules over the electrode surface, triggering the effective generation of promising properties of the proposed Au@NBT-based electrochemical immunosensor. As expected, favorable detection performances were achieved using this immunosensor towards CEA detection, where a good linear relationship between the current response and CEA concentration was obtained in the concentration range 10fg mL-1 to 100 ng mL-1 with a low detection limit (LOD) of 13.17fg mL-1. Also, the significantly enhanced selectivity, and stability guaranteed the promising electrochemical properties of this immunosensor. Furthermore, the analysis of real serum samples verified the high feasibility of this new method in clinical CEA detection. This work opens a new window for the application of nanoperovskite in the early detection of CEA.

Preparation and thermal/dielectric properties of medium/high entropy perovskite titanate ceramics

High-entropy ceramics have garnered significant attention in recent years owing to their exceptional properties and structural diversity. In this work, single-phase medium/high entropy ceramics, namely (Ca0.2Sr0.4Ba0.4)(Zr0.5Ti0.5)O3 and (Ca0.2Sr0.4Ba0.4)(Zr0.1Ti0.9)O3, were successfully designed and prepared utilizing Spark Plasma Sintering (SPS). A comprehensive investigation was conducted into the phase structure, microscopic morphology, dielectric properties, and thermal behavior of these ceramics. It was observed that all ceramics maintained a cubic perovskite structure (space group: Pm3‾m), and the introduction of multi-element doping rendered them more stable across a wide frequency and temperature range. Notably, (Ca0.2Sr0.4Ba0.4)(Zr0.5Ti0.5)O3 exhibited remarkably low dielectric loss (0.0001 at 1 kHz) at room temperature, along with excellent dielectric temperature stability (25–400 °C). By reducing the zirconium concentration in (Ca0.2Sr0.4Ba0.4)(Zr0.1Ti0.9)O3, a slight decrease in dielectric temperature stability was observed (25–350 °C); however, it demonstrated lower thermal conductivity (0.41 W/(m·K), 1200 °C) and maintained good high-temperature stability. The discovery highlights the promising practicality of both ceramics for high-temperature dielectric applications.

Efficient H2O/CO2 co-electrolysis with NixCu1-x alloy nanocatalysts modified perovskite-type titanate cathodes

Syngas, a mixture of H2 and CO with adjustable compositional ratios, can be directly produced via H2O/CO2 co-electrolysis in solid oxide electrolysis cells (SOECs). In this study, We have developed a strategy to enhance the catalytic activity of titanate perovskite cathodes by constructing active metal-oxide interfaces through the in-situ growth of NixCu1-x alloy nanocatalysts (x = 0, 0.25, 0.5, 0.75 and 1) on LST matrix. The evenly distribution of NixCu1-x alloy nanoparticles (∼30 nm) on the LST substrate has been confirmed through a serious of characterization techniques, including XRD, XPS, SEM and TEM. Specifically, the LSTNi0.75Cu0.25 cathode demonstrated an optimal synergistic effect, achieving high efficiency in the co-electrolysis of H2O/CO2 to syngas. Under an applied voltage of 1.6 V at 800 °C, the syngas production rate reaches 5.43H2 and 3.48 CO ml min−1 cm−2 with ∼96 % Faradaic efficiency. Furthermore, the composition of the produced syngas can be finely tuned in a broad range from 0.8 to 3.5 b y simply adjusting the inlet gas composition (H2O/CO2 ratio) and the operating temperature. The LSTNi0.75Cu0.25 cathode, when subjected to continuous H2O/CO2 co-electrolysis for 100 h, exhibited remarkable stability, attributing to the robust and active nature of the metal-oxide interfaces.