Carbon Neutralization
·
2025
·Vol. 4
·期 4
·e70030
·
IF 12
Hailong Zhong,Chuanwang Zeng,Jiajun Lai,Guiyong Liu,luya Jin,Chao Liu,Xiaopeng Qi
Engineering vacancy defects is a critical approach to modulating the properties of catalytic materials. However, the development of highly efficient vacancy defect catalysts and the investigation of their roles and effects remain challenging. In this study, nitrogen-doped carbon-coated Co 3 O 4 porous nanomaterials were synthesized using ZIF-67 as a sacrificial template. Subsequently, through vacuum heat treatment, nitrogen-doped carbon-coated Co 3 O 4 porous nanomaterials with an appropriate amount of oxygen vacancies were finally obtained. This material exhibits excellent oxygen evolution reaction (OER) catalytic activity. At a current density of 10 mA cm −2 , the overpotential is only 293 mV, and it has good cyclic stability. The existence of oxygen vacancies has been confirmed by various characterization methods. Moreover, density functional theory (DFT) calculations show that oxygen vacancies can enhance the electrical conductivity of the material, optimize the binding energy of the intermediates in the OER, and significantly improve the catalytic activity. In this study, a method of designing high-performance OER electrocatalytic materials by regulating the oxygen vacancies in the nitrogen-doped carbon-coated Co 3 O 4 system is proposed, which opens up a new way for the development of efficient transition-metal-based electrocatalysts for water splitting. Summary Using ZIF-67 as a template, obtained uniformly dispersed nitrogen-doped carbon-coated cobalt tetraoxide has relatively abundant porosity. The introduction of oxygen vacancy defects significantly improves the electrical conductivity and specific surface area of the material in favor of electrocatalysis. DFT calculation shows that the introduction of oxygen vacancy can significantly improve the conductivity of the material, Co 3 O 4 system is conducive to the reaction of oxygen-containing intermediates, reduces the binding energy required in the reaction process, and improves the electrocatalytic activity of the material. The prepared Co 3 O 4 /NC-Ov-1 showed excellent OER catalytic performance (overpotential of 293 mV at 10 mA cm −2 ).
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lihong Liu,Ming Yang,Bo Li,Duo zhang,Lihua Huo
In this paper, Au-modified Co 3 O 4 hollow nanospheres/graphene composites (Au-Co 3 O 4 /rGO) were synthesized for the first time through a novel “one-pot cooking” method at ambient temperature. The hollow nanospheres exhibited a particle size of approximately 10–15 nm, while the modified Au nanoparticles were about 4–5 nm in diameter. A high-efficiency and high response H 2 S gas sensor was constructed based on Au-Co 3 O 4 /rGO ternary composites. The effects of different Au modifying mass ratios on the H 2 S gas-sensitive performance of the composites were systematically investigated. At an operational temperature of 92 °C, the Au-Co 3 O 4 /rGO sensor, incorporating an Au loading mass ratio of 1.3 wt%, exhibited a response value of 175.4 for H 2 S at 100 ppm, a recovery time of 30 s, and a detection limit reaching as low as 10 ppb. This response was tripled compared to the undoped Co 3 O 4 /rGO sensor. At the same time, the H 2 S sensing mechanism by Au-Co 3 O 4 /rGO was discussed in detail.
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RSC Advances
·
2015
·Vol. 5
·期 86
·70527-70535
·
IF 3.84
Kaina Shang,Wentao Li,Yongmei Liu,Wenguang Zhang,Hui Yang,Jiqing Xie,Zuyan Liu,Shu-Lei Chou,Lingzhi Zhao,Ronghua Zeng
We report the synthesis of a novel shuttle-like Fe3O4–Co3O4 self-assembling architecture through a facile hydrothermal method. The composite manifests quite excellent electrochemical performance as anodes of Li-ion batteries. It delivers a high reversible capacity of ∼1013 mA h g−1 at 100 mA g−1 after 100 cycles (∼1246 mA h g−1 at 0.5 A g−1, 864 mA h g−1 at 1 A g−1 and 625 mA h g−1 at 2 A g−1 after 50 cycles). The rate performance is also outstanding with a reversible capacity of 660 mA h g−1 even at 5 A g−1 and a capacity retention of 94% after 78 cycles. The synergetic effect of Co3O4 and Fe3O4, as well as the unique self-assembling architecture, may be responsible for the large enhanced electrochemical performance.
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CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jiaqin Liu,Chen Zhou,Wenzhe Yue,Bo Yan,Yichao Lin,Aisheng Huang
A facile and green template-free hydrothermal method was conducted to controllably synthesize spinel type cobalt oxides (Co 3 O 4 ) with cube, truncated octahedron and octahedron morphologies. The catalytic performance over various shapes of catalysts was investigated towards CO oxidation. Among of them, the Co 3 O 4 cube performs the best catalytic activity, which can even be comparable to those of certain noble metal catalysts. The phenomenon might be ascribed to the synergistic effects of exposed Co 3+ active sites and surface oxygen distribution on the surface of the catalyst. The results may provide significant insights for the fabrication of metal oxide catalysts for CO oxidation .
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhe Liu,Xichao Mo,Shuhao Tian,Jie Chen,Yanpeng Liu,Haiyang Wu,Yawei Zhao,Yanrong Wang,Shanglong Peng
As one of the two-dimensional (2D) nanomaterials , MXene exhibits great potential on gas-sensing owing to its high specific area, rich functional groups and great charge transfer mobility. Herein, electrostatic adsorption and calcination strategies were taken for ZIF-derived Co 3 O 4 and alkalized Ti 3 C 2 T x MXene to fabricate Co 3 O 4 /MX7.5 heterojunction . It can be found that Co 3 O 4 nanoparticles (NPs) uniformly grow on the surface of alkalized Ti 3 C 2 T x . Alkalized Ti 3 C 2 T x with lower work function (lower than 3.9 eV) can transfer more electrons towards Co 3 O 4 and promote the redox of Co 2+ . These increased Co 2+ ions can help to adsorb more adsorbed oxygen and produce more oxygen defects, which enhances contact interaction between ethanol molecules and adsorption sites. The formation of heterojunction between Co 3 O 4 and MXene is observed by UV–vis spectra, and this interface effect enhances the ability of gas sensors. Therefore, the sensors based on the obtained Co 3 O 4 /MX7.5 heterojunction can operate at a relatively low temperature (140 °C) with a response of 3500 % and a low detection limit of 1 ppm. And it also delivers long-term stability (about 30 days). This work demonstrates practical application for detecting ethanol at a relatively low working temperature and keeping their response in a long term.
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ChemSusChem
·
2017
·Vol. 10
·期 14
·2875-2879
·
IF 7.226
Jun-Jun Zhang,Hong-Hui Wang,Tian-Jian Zhao,Ke-Xin Zhang,Xiao Wei,Zhi-Dong Jiang,Shin-Ichi Hirano,Xin-Hao Li,Jie-Sheng Chen
Oxygen vacancies can help to capture oxygen-containing species and act as active centers for oxygen evolution reaction (OER). Unfortunately, effective methods for generating a high amount of oxygen vacancies on the surface of various nanocatalysts are rather limited. Here, we described an effective way to generate oxygen-vacancy-rich surface of transition metal oxides, exemplified with Co 3 O 4 , simply by constructing highly coupled interface of ultrafine Co 3 O 4 nanocrystals and metallic Ti. Impressively, the amounts of oxygen vacancy on the surface of Co 3 O 4 /Ti surpassed the reported values of the Co 3 O 4 modified even under highly critical conditions. The Co 3 O 4 /Ti electrode could provide a current density of 23 mA cm −2 at an OER overpotential of 570 mV, low Tafel slope, and excellent durability in neutral medium. Because of the formation of a large amount of oxygen vacancies as the active centers for OER on the surface, the TOF value of the Co 3 O 4 @Ti electrode was optimized to be 3238 h −1 at an OER overpotential of 570 mV, which is 380 times that of the state-of-the-art non-noble nanocatalysts in the literature. Graphical Interface activation : An easy but effective approach to generating a rich amount of oxygen vacancies (V O ) in Co 3 O 4 nanocrystal-based oxygen evolution reaction (OER) electrodes by constructing a highly coupled interface with metallic Ti is demonstrated. Oxygen vacancies help to capture water molecules for OER in neutral electrolyte, resulting in impressively high current density and TOF value at an OER overpotential of 570 mV.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Tao Sun,Yue Wang,Zenghui Li,Anning Jiang,Lijuan Yang,Jijun Feng
Electrocatalysts often undergo reconstruction during the electrochemical process, especially the surface phase. This dynamic evolution makes the relationship between actual microstructure and catalytic activity confusing. Therefore, unraveling this dynamic evolution and further mastering effective methods to provoke advantageous structural emergence is crucial. Herein, we report an electroreduction strategy to stimulate grain boundary-rich Co 3 O 4 nanoneedle going on structure evolution and boosting its catalytic performance toward nitrate reduction reaction (NO 3 RR). Under suitable oxyacid ions solution and reduction potentials, hexagonal Co(OH) 2 nanoplates and oxygen-vacancies (O v ) rich Co 3 O 4-x nanofilm epitaxial growth on Co 3 O 4 nanoneedle. This microstructure evolution enhances the catalytic performance of pristine Co 3 O 4 nanoneedle toward NO 3 RR. Optimal Co 3 O 4-x /Co(OH) 2 @NF electrode achieves a remarkable ammonia Faraday efficiency 93.36 ± 3.66% and a NH 3 yield rate 3.21 ± 0.158 mg h −1 cm −2 at a high potential of 0.05 V vs. RHE. This work presents a novel strategy for engineering high-efficiency electrocatalysts toward NO 3 RR.
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高影响因子
ACS Applied Nano Materials
·
2026
·
IF 5.8
Xinru Wang,Lei Jin,Wenqian Li,Yu-Shi He,Jinglin Mu,Weimin Zhang
Electrocatalytic hydrogenation dechlorination (EHDC) has emerged as a promising and environmentally benign strategy for the degradation of chlorinated phenols (CPs), owing to its green process characteristics and the absence of hazardous byproducts. Achieving high EHDC efficiency necessitates both a highly active electrocatalyst and optimized reaction conditions. In this work, we fabricated a Pd/Co3O4 electrode, comprising ultralow-loading Pd nanoparticles (0.011 mg Pd cm–2) supported on a Co3O4 nanoarray grown on carbon fiber paper (CFP), for EHDC applications. The well-defined array structure facilitates uniform potential and current density distribution while also expanding the number of electroactive sites. Electrochemical and theoretical analyses reveal that abundant oxygen vacancies (OVs) in Co3O4 induce a spatial charge redistribution in the Pd/Co3O4 heterostructure, thereby strengthening the metal-support interaction (SMSI). This optimization of geometric and electronic properties significantly enhances both hydrogen evolution capability and EHDC performance. Under optimized operational parameters, including pH, substrate concentration, and applied potential, the Pd/Co3O4/CFP electrode achieves nearly complete degradation (close to 100%) of 10 mg·L–1 4-chlorophenol (4-CP) within 180 min at a cathodic potential of −0.8 V vs Ag/AgCl, with phenol (P) as the main product. The mass activity (MA) for 4-CP dechlorination reaches 1.0289 min–1 mg–1. Density functional theory (DFT) calculations further illustrate that the underlying oxygen vacancy rich Co3O4 modulates the electronic structure of Pd, boosting hydrogenation capacity and EHDC efficiency. These findings underscore the great potential of the Pd/Co3O4/CFP electrode as an efficient and practical electrocatalyst for EHDC processes.
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Micromachines
·
2026
·Vol. 17
·期 2
·247
·
IF 3.5
Xueqi Wang,Yu Hong,Guohui Wu,Yujie Hou,Shengnan Zhao,Binbin Dong,Jianchun Fan,Jun Yu
Gas sensors based on metal oxide semiconductors (MOS) have attracted significant attention in monitoring of methane emission and leakage monitoring due to their high sensitivity, fast response time, simple structure and low cost. However, the high power consumption caused by long-term high-temperature operation of MOS sensors restricts their application in mobile and portable devices. In this study, MOF-derived Co3O4dodecahedrons for low-concentration methane detection at room temperature was prepared using Zeolitic Imidazolate Framework-67 (ZIF-67) as a template and with various calcination temperatures. Among them, the Co3O4-350 calcined at 350 °C exhibited the optimal CH4sensing performance at room temperature, with a response of Rg/Ra= 1.53 to 2000 ppm CH4. This enhanced gas sensing performance is attributed to the highest Co3+proportions and the largest specific surface area in Co3O4-350 nanomaterials, which provided more active sites for gas adsorption and reaction. To address the challenge of slow response speed and irrecoverability during CH4detection at room temperature, the Co3O4nanomaterials were printed onto a micro-heater plate (MHP) to form a MEMS gas sensor. By introducing a pulse heating mode to the MEMS sensor, the response and recovery time were significantly reduced to 26 s and 21 s, respectively. This enhancement improves both the efficiency and reliability of the MEMS gas sensor for early-stage detection of CH4leaks in various industrial applications.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Dexin Jin,Changhua Wang,Yinhe Rong,He Ma,Yingying Li,Xintong Zhang
Photo-plasma catalysis, combining the controllability of photocatalysis with the high reactivity of plasma, presents a promising platform for reactive oxygen species (ROSs) generation. However, efficient coupling of photocatalysis and plasma requires interfaces that integrate multiple catalytic functions to reconcile differences between the two processes. Herein, we report the tuning of the TiO 2 /Co 3 O 4 nano-interface for efficient photo-plasma catalytic ROS generation by loading a Co 3 O 4 nanozyme onto a surface-disordered TiO 2 photocatalyst. For bisphenol A (BPA) removal, the composite catalyst achieves a degradation rate that is 17.3-fold and 12.6-fold higher than those of plasma and photocatalysis alone, respectively. Combined ROS scavenging and probe analyses reveal that the enhanced bisphenol A removal is directly related to the efficient singlet oxygen ( 1 O 2 ). Further mechanistic analyses suggest that the yield of 1 O 2 is linked to the conversion of superoxide radicals (•O 2 − ). The heterogeneous nano-interface serves as the key reaction center. Specifically, surface disorder and heterojunction-driven electron accumulation promote •O 2 − generation via photocatalytic O 2 reduction on TiO 2 , while holes in Co 3 O 4 oxidize plasma-generated H 2 O 2 to •O 2 − through a sustained Co 3+ /Co 2+ redox cycle. Compared with TiO 2 /Fe 2 O 3 and TiO 2 /CuO, TiO 2 /Co 3 O 4 exhibits superior photo-plasma catalytic performance due to the more efficient conversion between H 2 O 2 and •O 2 − enabled by the stable Co 3+ /Co 2+ redox cycle. This work provides a general paradigm for developing interfacial reaction centers in catalysts to improve coupled catalytic ROS generation.
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PubMed
高影响因子
Journal of Environmental Sciences
·
2026
·
IF 6.5
Dengxiang Zhang,Tianqi Chen,Shuai Liu,Lian Duan,Ning Zhang
Electrochemical nitrate reduction has emerged as a sustainable route for green ammonia synthesis. Cobalt oxide exhibits high activity owing to its efficient proton generation from water electrolysis. Nevertheless, the unsynchronized proton supply and nitrogen oxide intermediate conversion results in competing H 2 evolution and reduced ammonia selectivity. To address this issue, we designed a Co 3 O 4 @CoS 2 nano-heterostructure catalyst by introducing CoS 2 (with excellent NO x adsorption performance) via hydrothermal synthesis. Electrocatalytic tests showed that the as-prepared Co 3 O 4 @CoS 2 nanocatalyst achieved a Faradaic efficiency of 99.91 % and an NH 3 yield of 23.97 mg/ (h·cm 2 ) at −0.3 to −0.7 V vs. RHE, significantly outperforming pristine Co 3 O 4 and CoS 2 . Results from in-situ Raman spectroscopy and density functional theory calculations revealed that the superior performance stems from enhanced NO x adsorption/hydrogenation and a reduced reaction energy barrier of Co 3 O 4 @CoS 2 with CoS 2 incorporation. This work proposes a facile and efficient heterostructure construction strategy, offering new insights into the design of electrocatalysts for NH 3 synthesis.
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Advanced Powder Materials
·
2026
·
IF 26.8
Selvam Mathi,Weijiang Gan,Adewale K. Ipadeola,Hao Yang,Aboubakr M. Abdullah,Zhongmin Wang,Mohammad Al-Mamun,M.-Sadeeq Balogun
Regulating the reaction microenvironment at the catalyst-electrolyte interface is a key lever for accelerating alkaline hydrogen evolution reaction (HER) kinetics. However, most noble-metal-free oxide catalysts are limited by rigid electronic structures that impede dynamic charge redistribution. Here, we develop a metastable Co 3 O 4 -CoN catalyst that establishes a self-adaptive reaction microenvironment through charge redistribution at the oxide-nitride interface, enhancing alkaline HER kinetics. Nitrogen- and vanadium-codoped Co 3 O 4 -CoN hollow nanowires (HNV/Co 3 O 4 -CoN) were synthesized through a programmed reduction-annealing route, yielding mixed-valence cobalt surfaces with spatially confined defects and dopant gradients. This metastability-induced electronic flexibility, promotes water dissociation on oxide-derived sites while maintaining favorable hydrogen adsorption on nitride-modified regions, improving both elementary steps of alkaline HER. Ultraviolet and X-ray photoelectron spectroscopy indicate pronounced interfacial charge redistribution and work-function modulation induced by dopant incorporation and metastable phase coupling. The optimized HNV/Co 3 O 4 -CoN catalyst delivers an ultralow overpotential of 7 mV@10 mA cm -2 and 264 mV@1000 mA cm -2 high current density, while sustaining stable electrolysis at ≥500 mA cm -2 . Mechanistic analysis supports reduced barriers for water dissociation and near-thermoneutral hydrogen adsorption on the coupled interface. This work demonstrates a generalizable strategy to construct electronically adaptable surfaces for high-current-density, noble-metal-free hydrogen evolution.
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