Coral-like Structures Research Articles

One-step fabrication of multifunctional superhydrophobic copper surfaces via laser-assisted ablation PDMS solution

The super-hydrophobic surfaces have been greatly restricted in multi-functional applications because of the poor surface durability and multi-step processes such as preparing rough structures and low surface energy modification. In this work, a multifunctional wear-resistant super-hydrophobic surface (SHS) was primarily developed by one step laser etching polydimethylsiloxane (PDMS) i.e. the uncured PDMS layer was laser-ablated just after it was coated on the surface of copper. The wettability, morphology and chemical composition of the surfaces were characterized by a contact Angle measuring instrument, scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR). The results show that the developed SHS has the high contact angle (WCA) of 156.8° and low sliding angle (WSA) of 4.6°; which presents a regular linear grating array and a large number of coral-like rough structures, and the developed SHS can withstand at least 120 tape stripping tests, 40 sandpaper friction abrasion tests, 60 h of high temperature treatment (100 °C∼300 °C) or 240 h of ultraviolet light exposure tests, respectively. The self-cleaning rate and anti-fouling rate of the SHS were 94.2 % and 91.8 %, respectively, and the freezing time of droplets on the SHS is 162 s longer than that on the original copper surface, and almost 3 times longer than that on the smooth surface. In all, the non-polluting wear-resistant multifunctional SHS was primarily developed by laser ablation of metals and polymers, which has strong potential usage in the fields of anti-fouling of industrial pipeline systems and anti-icing of outdoor power transmission systems.

Ru-induced lattice expansion of metallic Co with favorable surface property for high-efficiency water electrolysis

The development of high-performance electrocatalysts for alkaline hydrogen evolution reaction (HER) is an important step towards achieving hydrogen economy but remains major challenge. This study reports the growth of ultralow Ru (1 wt%) modified Co nanostructures (Rud-Co) with coral-like nanoarray structures on carbon cloth via lattice expansion tactics. Specifically, the as-fabricated Rud-Co electrode exhibits extraordinary electrocatalytic activity, with an overpotential of 25 mV at a current density of 10 mA cm−2 and a small Tafel slope of 31 mV dec−1 in alkaline media, which is superior to the benchmark Pt/C. Density functional theory (DFT) calculations disclose that Ru can shift the d-band center of Co to higher fermi level, which promotes electron transfer, H2O dissociation and *H adsorption during catalysis. This work provides a promising strategy for the development of efficient transition metal-based alkaline HER electrocatalysts via accelerating electron transfer and promoting mass transportation.

Preparation and Electrochromic Properties of MnO2/PPy Composite Films with Coral-like Structures.

MnO2/polypyrrole (PPy) composite films were deposited on fluorine-doped tin oxide (FTO) conductive glasses by a two-step wet-chemical method, including electrochemical deposition and chemical bath deposition (CBD). The porous MnO2 films were first grown on FTO glasses by an electrodeposition method. Second, polypyrrole nanoparticles were polymerized by the oxidation-reduction reaction between MnO2 and pyrrole, using the presynthesized MnO2 as the skeleton. Then, MnO2/PPy composite films with coral-like structures were obtained. The electrochemical and electrochromic (EC) properties of the prepared films were investigated. The results show that, compared to the single MnO2 or PPy film, the MnO2/PPy composite film has a larger optical modulation (67.3% at a wavelength of 900 nm), faster response times (4 s for coloration and 3 s for bleaching), and a higher coloration efficiency (218.16 cm2·C-1). The high coloration efficiency attests to the exceptional performance of the composite film in converting electrical signals into vivid color changes. The electrochemical stability test results show that the composite film maintains a stable EC performance after 200 coloration/bleaching cycles. The coral-like structures of the composite film are responsible for the better EC properties.

Tailored PEO synthesis and in-situ ATR-FTIR study of PtSnO2/Nb coral-like structures for application in ethanol electrooxidation

Coupling the electrooxidation of organic compounds (EOO) with hydrogen evolution can be a sustainable way for green hydrogen production, and therefore it’s of great interest to the development of suitable electrocatalysts for efficient EOO. In this study, we present the successful solvothermal synthesis of a Pt-based electrocatalyst for an ethanol oxidation reaction (EOR), using a coral-like structure as substrate which was prepared by plasma electrolytic oxidation (PEO) on a metallic niobium. Chemical analysis revealed the predominance of SnO2 in the PEO structure, while Pt doping demonstrated selectivity on the surface of the electrocatalyst. Cyclic voltammograms indicate a high electrochemically active surface area (122.45 m² gPt−1), with an onset potential of 0.27 V vs. SHE. In-situ spectroelectrochemical analysis confirm the efficient ethanol electrooxidation with remarkable selectivity in C-C bond cleavage. The prepared electrocatalyst stands out as a promising contribution to advances in green hydrogen production by coupling EOR with hydrogen evolution.

Femtosecond laser-textured superhydrophilic coral-like structures spread AgNWs enable strong thermal camouflage and anti-counterfeiting

Modulating the thermal emission of a material in the infrared (IR) range can be essential for various practical applications such as smart textiles, camouflage, and anti-counterfeiting. Although many different materials or structures have been proposed, the complex manufacturing processes are still hindering their widespread use. Herein, a facile femtosecond laser processing technology and a drop-coating method are introduced to form a patternable low emissivity film. Laser-treated polyimide films resulted in superhydrophilic structured surfaces that are uniformly coated with silver-nanowires (AgNWs) in aqueous solutions for low emissivity surfaces. Furthermore, the emissivity of the samples is as low as ∼0.2 without deterioration over 800 bending-releasing cycles. The as-prepared films also display good thermal camouflage properties, namely, the films reduced the thermal radiation temperature of an object by 35.8 °C when the object temperature was ∼69.1 °C. Additionally, this IR camouflage effect of the AgNWs coated samples shows excellent stability even in harsh environments such as immersion in water, acid, alkali, and salt solution and applied voltage. We also show that information encryption was possible by adjusting the amount of AgNWs. The design of this programmable patterned low emissivity film indicates an idea for the thermal camouflage and anti-counterfeiting technology, which can carry more abundant application scenario and disguise them more complex and sophisticated.

Antibacterial PVDF Coral-Like Hierarchical Structure Composite Film Fabrication for Self-Cleaning and Radiative Cooling Effect.

Passive radiative cooling (PRC) is a zero-energy-consumption technology that reflects sunlight and radiates heat to cold outer space. In this work, a porous poly(vinylidene fluoride)-poly(methyl methacrylate) (PVDF-PMMA) composite film is fabricated by decorating zinc-imidazolate metal-organic framework (MOF) (ZIF-8) particles obtained by phase inversion. Due to the competent scattering via the coral-like hierarchical structures and the vibration excitations of specific functional groups, the prepared film exhibits good solar reflectance (92.6%) and intermediate infrared emittance (99.1%), with an average sub-ambient cooling of 10.4 °C under a solar radiation intensity of 0.6 AM1.5. Additionally, poly(vinylidene fluoride) has a low surface energy, while the ZIF-8 particles and coral-like hierarchical structures enhance the surface roughness, endowing the surface with significant superhydrophobicity characterized by a water contact angle (WCA) of 157.5° and a sliding angle (SA) of 2°. These films exhibit excellent antibacterial properties. When the content of ZIF-8 particles in the film is 300 mg·L-1, the antibacterial rate reaches 100% after 1 h of treatment. Thus, the ZIF-8 porous poly(vinylidene fluoride)-poly(methyl methacrylate) composite (ZPPP) film has potential application prospects in areas with high health and environmental requirements, such as cold chain transportation and public spaces.

Effect of reducing agents on structural, morphological, optical and electrochemical properties of Mn2O3 nanoparticles by co-precipitation method

Abstract In this work, two different reducing agents namely sodium hydroxide and potassium hydroxide (NaOH and KMnO4) were used to synthesis of manganese oxide (Mn2O3) nanoparticles by the co-precipitation method and examined for the electrochemical applications. The as-prepared Mn2O3 nanoparticles using NaOH precursor, dried in a hot oven at 80 °C for 6 h (MN-1) and then annealed for 7 h at 600 °C (MN-2). Similarly, Mn2O3 nanoparticles were prepared using KMnO4 precursor, dried in a hot oven at 80 °C for 6 h (MK-1) and then annealed for 7 h at 450 °C (MK-2), respectively. The influences of reducing agents on structural, morphological and optical properties were investigated. The structural analysis revealed the prepared samples had tetragonal crystal structures with better crystallinity. FT-IR spectral analysis revealed the characteristic bonds of Mn–O–Mn were observed in the region of 486–573 cm−1. The FE-SEM and HR-TEM images showed coral-like and nanorod structures for samples MN-2 and MK-2, with exhibited lattice value of 0.27 nm related to the (222) plane. The presence of the elements manganese (Mn) and oxygen (O) was confirmed by EDAX mapping. The XPS study confirmed that the oxidation state of the prepared samples was +2. The UV-Vis spectra suggested that the adsorption edge was blue-shifted compared to the sample MN-2. Cyclic voltammetry (CV) and galvanostatic charge–discharge experiments demonstrated that charge storage in Mn2O3 exhibited faradic-dominated capacitive behavior. MN-2 nanorod structures were obtained at excellent specific capacitance value of 196 F g−1 compared to MK-2 nanoparticles. Based on this study, Mn2O3 nanoparticles was recommended as exceptional electrode materials for efficient supercapacitor applications due to its superior electrical conductivity, large surface area and redox properties.

Piezo-Photocatalytic Degradation of Tetracycline by 3D BaTiO3 Nanomaterials: The Effect of Crystal Structure and Catalyst Loadings

Piezoelectric photocatalysis improves catalytic activity by preventing photogenerated carrier recombination. Hence, three morphologies of BaTiO3 (BTO) were successfully prepared for the piezoelectric photocatalytic degradation of tetracycline (TC, C(TC) = 40 mg/L). The tetragonal-phase BaTiO3 nanoparticles (BTO-NPs) showed the best performance in comparison with cubic-phase nanoflowers (BTO-Nf) and cubic-phase coral-like structures (BTO-Nc) under the same conditions (C(BTO) = 0.6 g/L). When the loading of BTO-NPs was reduced to 0.2 g/L, the photocatalytic degradation efficiency was lowered from 64.2% to 50.1%. However, the 0.6 g/L BTO-NPs increased by only 12.8% after piezoelectricity induction. On the contrary, the BTO-NPs’ degradation effect of 0.2 g/L with the piezoelectric effect was greatly improved from 50.1% to 78.0%, with an increase rate of 27.9%. As the quantity of catalyst was decreased, the increased inter-particle voids made the lattice more susceptible to deformation by external forces, producing a more pronounced piezoelectric effect. These findings indicate that crystal structure and catalyst loading are critical factors in increasing piezoelectric photocatalytic performance. This article emphasizes the application value of piezoelectric photocatalysis in degrading organic pollutants, and provides practical guidelines for optimizing its performance.

Solution combustion synthesis of nanostructured Ni/W-containing electrocatalysts for hydrogen evolution reaction: The effect of fuel-to-oxidant ratio

The effect of varying fuel-to-oxidant ratio (φ) on the physicochemical properties and electrocatalytic performance for the hydrogen evolution reaction (HER) of nanostructured NiW materials produced via solution combustion synthesis (SCS) method was investigated. Agar and nickel nitrate served as the fuel and oxidant, respectively. TGA-MS results revealed that a fuel-to-oxidant ratio of 9 (φ9) provides the optimal conditions for reducing metal oxides to metallic phases due to the highest emission of reducing gas species (H2, CH4, and NH3). N2 adsorption/desorption measurements indicated that under fuel-rich conditions (φ > 1), both the specific surface area and porosity expanded with increasing the fuel quantity. Microscopy characterization was found to be consistent with N2 adsorption/desorption and TGA-MS results, revealing that the increased gas expulsion from higher fuel content led to more pronounced coral-like structures comprising of nano-sized particles and pores. Evaluation of electrocatalytic activity in an acidic medium (0.5 M H2SO4) revealed that the φ9 sample demonstrated the highest electrocatalytic HER performance. XRD and XPS analyses correlated well with this result, attributing the enhanced HER activity to the presence of the Ni0.9W0.1 metallic phase, limited oxide formation, and the highest proportions of metallic Ni and W atomic states, beyond mere surface area effects. Consequently, this study provides valuable insights into the importance of the fuel-to-oxidant ratio in optimizing the SCS method for controlled synthesis of nanostructured NiW materials in terms of morphology and composition, with implications for their potential development as high-performance, cost-effective electrocatalysts.

The Natural Growth of CaCO3 Crystals on Hemp Yarns: A Morphology Analysis and the Mechanical Effects on Composites

Plant fibres are promising candidates to replace synthetic fibres in polymer matrix composites. However, there is still an important issue to overcome: the poor quality of adhesion at the fibre/matrix interface. Many surface treatments of plant fibres have been developed, most of them based on non-environmentally friendly processes. In this paper, a 100% natural treatment is proposed. Hemp yarns are immersed in tap water until the natural growth of limestone beads attached to their surface occurs. The morphology analysis reveals that these calcium carbonate crystals have a nanoneedle architecture, with hemp fibres acting as nucleators for these highly ordered coral-like structures. Tensile tests on ±45° woven hemp/epoxy composites show that the presence of CaCO3 beads improves the adhesion quality of the fibre/matrix interface and, therefore, increases Young’s modulus value.

Identification of intermetallics in the laser-welded joint of rare-earth magnesium alloy and the corresponding strengthening mechanisms

Morphology and distribution of intermetallic compounds in the heat-affected zone (HAZ) are easily altered during welding thermal cycles, contributing to the softening of the HAZ. Finding solutions to mitigate the softening and enhance the strength of the joint is currently at the forefront of Mg alloy processing and manufacturing. In this work, 0.7 mm thick Ce-containing Mg alloy sheets were successfully joined using fiber laser welding. The microstructure of the joint was observed employing scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). Accordingly, the phase compositions in both HAZ and fusion zone (FZ) were determined. Subsequently, the mechanical properties of the joint were evaluated through tensile-shear and hardness tests. The results revealed that the HAZ experienced softening, retaining 76.6% of the strength of the base metal in the tensile-shear test. Interestingly, intermetallics composed of conventional alloying elements within the HAZ transformed into coral-like structures during the welding thermal cycles, whereas the morphology and distribution of intermetallics containing rare-earth (RE) elements barely changed. As a result, the joint exhibited cracks along the boundaries of the coral-like precipitates during tensile loading. In comparison, both intermetallics consisting of conventional elements and those containing RE elements were fragmented into micron-sized fine particles in the FZ, leading to an increase in the strength of the FZ. Ultimately, the mechanisms responsible for the softening of the HAZ and the strengthening of the FZ were elucidated, presenting a promising welding solution for Mg alloys.

Formation of highly ordered TiO2 nanotubes on Ti6Al4V alloys manufactured by electron beam powder bed fusion (E-PBF)

Highly ordered TiO2 nanotubes were obtained by anodization on Ti6Al4V substrates manufactured by electron beam powder bed fusion (E-PBF). Effects of anodization parameters such as anodizing time, stirring, fluoride concentration, and water content were analyzed in an organic electrolyte (ethylene glycol) that contains ammonium fluoride. The ordering of the nanotubes was measured by regularity ratio calculations based on fast Fourier transform (FFT) from SEM images. It was found that for the processed specimens, the highest ordering of the TiO2 nanotubes was reached at 30 V for 5000 s with a concentration of 9 vol% H2O and 0.4 wt.% NH4F, exhibiting nanotubes free of delamination, cracks, and coral-like structures with a regularity ratio (RR) of 1.91. This work offers a simple method for creating homogeneous and organized TiO2 nanotubes on Ti6Al4V substrates manufactured by E-PBF which potentially improves its functionality in diverse industrial applications such as nanosensors, controlled-release substances, solar cells, water splitting, electrochromic devices, and Li-ion battery anodes.Graphical

Three-Dimensional-Printed Coral-like Structures as a Habitat for Reef Fish

Coral reefs are three-dimensional biogenic structures that provide habitat for plenty of marine organisms; yet, coral reefs are deteriorating worldwide. Hence, it is essential to identify suitable substitutes for such coral services. This study examines reef fishes’ behavior and reactions to three-dimensional-printed (3DP) corals based on scanned Stylophora pistillata, as well as modified 3DP models. In particular, fishes’ unresponsiveness to the color, shape, morphology, and material of 3DP models both in vitro and in situ experiments was investigated. Coral reef fishes responded to the 3DP corals and demonstrated their usage in a range of services. Moreover, a greater number of fish species interacted more with 3DP models than they did with live corals. Furthermore, specific reef fish species, such as Sea Goldies (Pseudanthias squamipinnis), showed a preference for specific 3DP coral color, and other species demonstrated preferences for specific 3DP model shapes. The current study results show that three-dimensional-printed coral models can substitute for live corals for certain types of reef fish services.

Synthesis of coral-like structures of Pr–Yb co-doped YIG: Structural, optical, magnetic and antimicrobial properties

Coral-like structures of the Y3–xPrxFe5–yYbyO12, (0.00 ≤ x ≤ 0.04), (0.00 ≤ y ≤ 0.02) compound were synthesized using the sol-gel method. Structural investigation certified the YIG cubic crystal structure formation, without any secondary phase. It is shown that, the relatively large ionic radius of the dopant cations results in an expansion of the lattice parameter, variations in the Iona‒O‒Iond angle, Iona‒O, Iond‒O and Ionc‒O bond distances and decrease in the average crystallite size. Fourier transform infrared (FTIR) and Raman measurements are essential to testify the single-phase formation of YIG crystal structure and are observed changes in the stretching and vibrational modes, respectively. The morphological study, energy dispersive spectroscopy (EDS) spectra and textural properties show coral-like structures, peaks associated with Pr3+ and Yb3+ atoms and the effect of dopants on surface area, diameter, and pore volume, respectively. The optical analysis from diffuse reflectance spectra witnessed an increase in the optical gap band, a decrease in Urbach energy and blue shift in the charge transfer, correlated with the expansion of the unit cell due to the dopant's insertion in the YIG structure. A typical ferrimagnetic behavior is exhibited by the Y3–xPrxFe5–yYbyO12 compound. The saturation magnetization (Ms), cubic anisotropy constant (K1) and coercive field (Hc) increase with the Pr3+ cations content, as consequence of their magnetic nature and distribution around of Fe3+ ions due to the coexistence with the Yb3+. Finally, for the first time, antibacterial tests by mean of the direct contact method were performed for YIG co-doped with Pr3+ and Yb3+ and it is shown that, relatively high dosages of Pr3+ cations favored the activity against S. aureus, therefore, a new biological property for YIG doped with rare earths is presented.

Fabrication of a durable brass mesh capable of rapid transformation between two modes of liquid transportation

Low cost, process controllability, and durability have been the key problems in the application of superhydrophobic materials, and there are many difficulties in achieving these goals. A simple ultrasound-assisted nitric acid etching method is now described for the construction of coral-like metal structures on the surface of a brass mesh pipe. The structures are formed by the different corrosion rates of the two metals in the alloy during etching. These structures exhibit superoleophobic characteristics in water and, following modification by immersion in aqueous sodium laurate solution, superhydrophobic characteristics in air. The surface wettability of the pipe can be converted multiple times within one hour to facilitate two modes of liquid transportation, in water and in air. The pipe material has excellent durability, withstanding severe mechanical contact including fingertip friction, arbitrary folding, knife scratching, and load friction, without significantly altering the surface wettability. This novel material can be prepared using a simple, controllable, low-cost, and environmentally friendly method and offers a new direction for the development of multi-interface liquid transportation devices.

Facile synthesis of amino-functionalized magnetic materials for efficient enrichment of anionic metabolites from biological samples

The analysis of biological samples is often affected by the background matrix. Proper sample preparation is a critical step in the analytical procedure for complex samples. In this study, a simple and efficient enrichment strategy based on Amino-functionalized Polymer-Magnetic MicroParticles (NH2-PMMPs) with coral-like porous structures was developed to enable the detection of 320 anionic metabolites, providing detailed coverage of phosphorylation metabolism. Among them, 102 polar phosphate metabolites including nucleotides, cyclic nucleotides, sugar nucleotides, phosphate sugars, and phosphates, were enriched and identified from serum, tissues, and cells. Furthermore, the detection of 34 previously unknown polar phosphate metabolites in serum samples demonstrates the advantages of this efficient enrichment method for mass spectrometric analysis. The limit of detections (LODs) were between 0.02 and 4 nmol/L for most anionic metabolites and its high sensitivity enabled the detection of 36 polar anion metabolites from 10 cell equivalent samples. This study has provided a promising tool for the efficient enrichment and analysis of anionic metabolites in biological samples with high sensitivity and broad coverage, facilitating the knowledge of the phosphorylation processes of life.

Dual-Mode Porous Polymeric Films with Coral-like Hierarchical Structure for All-Day Radiative Cooling and Heating

Passive radiative cooling (PRC) and passive radiative heating (PRH) have drawn increasing attention as green and sustainable cooling and heating approaches, respectively. Existing material designs for PRC/PRH are usually static and unsuitable for dynamic seasonal and weather changes. Herein, we demonstrate an all-day dual-mode film fabricated by decorating MXene nanosheets on porous poly(vinylidene fluoride) with abundant coral-like hierarchical structures obtained via phase inversion. The cooling side of the dual-mode film exhibits high solar reflectivity (96.7%) and high infrared emissivity (96.1%). Consequently, daytime subambient radiative cooling of 9.8 °C is achieved with a theoretical cooling power of 107.5 W/m2 and nighttime subambient cooling of 11.7 °C is achieved with a theoretical cooling power of 140.7 W/m2. Meanwhile, the heating side of the dual-mode film exhibits low infrared emissivity (11.6%) and high solar absorptivity (75.7%), contributing to a PRH capability of 8.1 °C, and excellent active solar and Joule heating as effective compensation for PRH. The dual-mode film could be easily switched between cooling and heating modes by flipping it to adapt to dynamic cooling and heating scenarios, which is important for alleviating the energy crisis and reducing greenhouse emissions.

High-strength electrospun polydimethylsiloxane/polytetrafluoroethylene hybrid membranes with stable and controllable coral-like structures

Polytetrafluoroethylene (PTFE) electrospun membranes have high specific areas, large porosities, and tunable structures. However, the fact that they are fragile and easily broken severely restricts their wide applicability. Using a coaxial electrospinning technique, we created a high-strength electrospun membrane with a stable coral-like microscale structure. Polydimethylsiloxane (PDMS), polyethylene oxide (PEO), and PTFE were employed as experimental materials. In addition, the microstructures and characteristics of these membranes could be easily manipulated by changing the electrospinning settings. Compared to the original properties of electrospun PTFE mats, the incorporation of PDMS into PTFE significantly improved mechanical performance. Young's modulus of the PDMS/PTFE membrane could be enhanced as much as 31.11 times. The as-prepared PDMS/PTFE membranes were hydrophobic. The excellent functionalities make this novel composite a well-qualified candidate for many cutting-edge applications.

Stable superhydrophobic and conductive surface: Fabrication of interstitial coral-like copper nanostructure by self-assembly and spray deposition

Water permeation is an important issue in both fundamental research and industrial applications. In this work, stable superhydrophobic copper surfaces were obtained by self-assembly and spray deposition on cotton fabrics. Scanning electron microscopy revealed that micro/nano dual-scale coral-like structures were established by the stacking of copper nanoparticles, thus forming a stable Cassie model for superhydrophobic feathers. The water contact angle of the surface was 161°, while the slide angle was as low as 3°. Chemical bonds were formed between substructures and copper nanoparticles by molecular grafting, which improved its mechanical stability, since the surface was verified to maintain a large contact angle after long-distance abrasion and folding. Compared with the superhydrophilic copper surface, the superhydrophobic coating showed better corrosion resistance in 3.5 wt% NaCl solution and artificial sweat. Combined with the inherent conductivity of copper, fabrics have potential applications in the new generation of advanced textiles.

Facile construction and controllable design of CoTiO3@Co3O4/N[sbnd]CNO hybrid heterojunction nanocomposite electrode for high-performance supercapacitors

We synthesized a heterojunction combination of cobalt titanate (CoTiO3)@Co3O4/NCNO as an electrode material for supercapacitors. The binary nanocomposite of CoTiO3@Co3O4 was accumulated in the rhombohedral@cubic structure of the R-3@F-d3m space-group. Further, the Rietveld refinement and Raman analysis were performed on the ternary CoTiO3@Co3O4/NCNO nanocomposite. The morphology of the ternary nanocomposite appeared as coral-like structures, where CoTiO3@Co3O4 binary nanoparticles of diameters from 50 to 100 nm are dispersed within the NCNO matrix. The current CoTiO3@Co3O4/NCNO composite electrode possessed a specific capacitance value of 873 F g−1, which is higher than that of a binary CoTiO3@Co3O4 electrode (775 F g−1) at 1 A g–1 current density. This increase is due to the presence of the NCNO matrix, which provides better charge transport properties and adds additional double-layer electrochemical characteristics that come from carbon nano-onions and the pyridinic redox reactions from the doped nitrogen. An asymmetric supercapacitor device made of the CoTiO3@Co3O4/NCNO nanocomposite and activated carbon (AC) showed excellent energy/power densities of 34.7 Wh kg−1/2.19 kW kg−1, at 4 A g−1. Even at an ultrahigh current density of 10 A g−1, a high-power density of 5.48 kW kg−1, an energy density of 13.7 W h kg−1, and capacitance retention of 90% is achieved. The present results indicate that the CoTiO3@Co3O4/NCNO nanocomposites can be used in high-performance supercapacitors.