CHEMICAL ENGINEERING JOURNAL
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2016
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IF 5.31
Qianqian Huang,Jiayin Zhang,Zhengyu He,Penghui Shi,Xin Qin,Weifeng Yao
N-doped carbon materials have great potential as functional materials for water pollution control. However, the synthesis of green and sustainable N-doped carbon catalysts face numerous challenges. This study uses a thermal treatment by directly heating a homogeneous mixture of cobalt acetate and dimethylglyoxime to synthesize lamellar ordering Co 3 O 4 /N/C compounds. Dimethylglyoxime was chosen to play duple roles as both nitrogen and carbon source. The obtained N-doped carbon material was used as a catalyst for effective aniline degradation by activating peroxymonosulfate (PMS). In this approach, nanomaterials with good catalytic performance, high stability, and magnetic property can be obtained, which facilitate recycle convenience. In this study, graphitic N is found to improve electron mobility, and the lone pair of pyrrolic-like N electrons tends to form effective Co-N 4 moieties with Co species, which can increase the catalyst activity. Therefore, the prepared catalyst has higher activity than individual Co 3 O 4 . Furthermore, the effects of N-doped carbon materials on aniline degradation by activated PMS and the proposed reaction pathways for the mineralization of aniline were explain in detailed.
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高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Fengyi Wang,Yihao Wang,Jinshuo Zou,Gemeng Liang,Kaiqi Hou,Lining Liu,Zehui Lin,Ci Song,Shengyu Liu,Xingyun Li
Crystal structure and surface modulation of Co 3 O 4 catalyst holds great promise for the improvement of catalytic performance for propane oxidation. In this study, Mn doping in Co 3 O 4 was first adapted to introduce crystal defects. And acid etching was then used to orchestrate the surface properties of Mn doped Co 3 O 4 . The combination of both Mn doping and acid etching resulted in a distorted crystal structure, which significantly activates the Co-O bonds, obviously increasing the exposed active oxygen and enhancing the intrinsic oxidation ability. Consequently, as a catalyst for propane oxidation, Mn-Co 3 O 4 -H facilitates the acetate intermediate generation and its decomposition, resulting in an excellent oxidation activity with propane conversion rate 3.8 times higher than that of the pristine Co 3 O 4 catalyst at reaction temperature of 195 °C. Meanwhile, the catalyst demonstrates a stable hydrothermal performance with negligible deactivation during 30 h on-stream test. This study set an important paradigm for the structure and surface manipulation of Co 3 O 4 catalyst for efficient propane oxidation.
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高影响因子
ACS Sensors
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2025
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IF 9.1
Song Xiao,Yuhang Xue,Zhanyuan Li,Chengying Wu,Yifan Zhang,Peng Wu,Ju Tang,Xiaoxing Zhang,Hongye Yuan,Yi Li
Perfluoroisobutyronitrile (C4F7N), an eco-friendly insulating gas, has been extensively utilized in diverse gas-insulated equipment (GIE) to replace the most potent greenhouse gas SF6. Nonetheless, given the low toxicity of C4F7N, the potential leakage risk at a high-pressure operational environment cannot be overlooked, making the development of highly sensitive gas sensors for leak detection essential. Herein, Co3O4 was selected as a specific gas sensing material for C4F7N detection based on the density functional theory screening. The Co3O4-based gas sensor was prepared, and its response performance was systematically evaluated. The interaction mechanism between Co3O4 and C4F7N was also examined by the oxygen vacancy theory. The sensor demonstrates a low detection limit of 0.15 ppm at its optimal operating temperature of 300 °C, exhibiting exceptional selectivity and repeatability, with a stability response time of 55.5 s and recovery time of 1478 s. The sensor’s application potential under actual working settings was validated using a simulated leakage test. Relevant results provide guidance for the leakage monitoring of the C4F7N-based GIE.
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PubMed
高影响因子
Sustainable Materials and Technologies
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2024
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IF 8.6
Yu Wan,Huiyao Li,Youlan Zou,Wenhao Tang,Shiyan Deng
Enhancing ionic conductivity and Li dendrite inhibition capability in poly(ethylene oxide) (PEO)-based solid polymer electrolytes (SPEs) is imperative for the advancement of all-solid-state lithium metal batteries (ASSLMBs). Herein, we incorporate the inorganic functional nanofiller of hollow porous polyhedral Co 3 O 4 to facilitate the formation of amorphous regions, thereby enhancing the migration of PEO chain segments. The suitable hollow porous polyhedral structure offers the advantage of minimizing filler agglomeration and providing a continuous and extensive network for ion transport, thereby enhancing ionic conductivity. The addition of 7 wt% Co 3 O 4 to PEO SPEs (PEO+ Co 3 O 4 –7) results in an enhanced ionic conductivity of 2.68 × 10 −3 S cm −1 and the Li + transference number of 0.493 at 60 °C. Furthermore, Li//Li symmetric cell with PEO+ Co 3 O 4 –7 SPEs enables a stable cycle for 1000 h at 0.2 mA cm −2 . LiFePO 4 / PEO+ Co 3 O 4 –7/Li cell indicates an initial capacity of 149 mA h g −1 and a reversible capacity of 113 mA h g −1 after 200 cycles at 0.2C. This study emphasizes the importance of constructing efficient ion transport paths through structural design.
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高影响因子
FUEL
·
2025
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IF 7.5
Zihao Hu,Xiaoying Zhou,Tiantian Zhang,Zuliang Wu,Jing Li,Wei Wang,Erhao Gao,Jiali Zhu,Shuiliang Yao
Catalytic combustion has been considered the effective way to oxidize carbon monoxide (CO). It is both crucial and challenging to develop highly-active monolithic catalysts at lower temperatures for industrial applications. This study synthesized a monolithic Co 3 O 4 /Mn 3 O 4 -NF catalyst by the generation of in-situ metal–organic framework (MOF-74)-derived Co 3 O 4 /Mn 3 O 4 on nickel foam (NF). The resulting Co 3 O 4 /Mn 3 O 4 -NF catalyst demonstrated superior low-temperature CO oxidation performance, and the T 90 temperature was 20 °C. The enhanced activity is associated with the increased oxygen vacancy concentration, abundant Co 3+ , Mn 2+ + Mn 3+ , and surface-adsorbed oxygen species (O ads ), as well as low-temperature reducibility. In addition, operando DRIFTS analysis revealed that the surface of this as-prepared catalyst possessed abundant terminal-type oxygen (M O), facilitating CO adsorption and catalytic oxidation. This pioneering study introduces a paradigm-shifting insight: the effectiveness of non-noble metal oxide catalysts can now compete with, and in some cases, outperform their noble metal counterparts. This breakthrough is set to transform the industry, presenting a compelling alternative to conventional noble metal catalysts and propelling the evolution of state-of-the-art environmental conservation technologies.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Wei-Xiao Li,Meng-Jiao Liu,Xiao-Yuan Wu,Sa-Sa Wang,Weiming Wu,Can-Zhong Lu
Porous Ni 2+ -doped Co 3 O 4 nanosheets were prepared by a combination method of electrodeposition and post-calcination. The catalytic activities of the as-prepared samples for the electrocatalytic nitrate reduction to ammonia were evaluated. It was found that the Ni 2+ -doped Co 3 O 4 sample with a Ni 2+ doping content of 20 % exhibited higher catalytic activity as compared with other samples. The outstanding catalytic activity of the 20 % Ni 2+ -doped Co 3 O 4 sample could be attributed to its porous nanosheet structure with rich oxygen vacancies, which was confirmed by SEM, XPS, TEM, EPR and operando EIS analyses. The DFT results further revealed that the increased hydrogen generation energy and nitrate adsorption, and the diminished rate-determining step energy barrier ensured Ni 2+ -doped Co 3 O 4 exhibited outstanding activity for the electrocatalytic nitrate reduction. Moreover, membrane-less electrocatalytic nitrate reduction was coupled with methanol oxidation by using the oxygen vacancies-rich Co 3 O 4 electrocatalyst. The Faradic efficiencies for the electroreduction of nitrate to ammonia and the electrooxidation of methanol to formate could keep at 98 % and 99 % after multiple cycles, respectively, revealing a good stability of the reported hybrid system for the membrane-less electrocatalytic ammonia synthesis.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Bei Xue,Kezhi Li,Shengyue Gu,Leilei Zhang,Jinhua Lu
Nanocrystalline transition metal oxides have attracted a great deal of attention due to their good electrochemical activity. To pursue novel active electrode materials with low detection, high sensitivity and good selectivity for the detection of H 2 O 2 , Ni foam-supported ZnO nanowires and Co 3 O 4 /NiCo 2 O 4 double-shelled nanocages (ZnO/Co 3 O 4 /NiCo 2 O 4 /Ni foam) have been successful fabricated by facile and effective methods When tested as an enzymatic-free H 2 O 2 electrochemical sensor, the obtained ZnO/Co 3 O 4 /NiCo 2 O 4 /Ni foam exhibits fast response time within 5 s, low detection limit of 0.163 μM (S/N = 3), high sensitivity of 0.388 mA mM −1 cm −2 , wide linear range from 0.2 μM to 2.4 mM (R 2 = 0.996), exhibiting good selectivity and long-term stability. The reason is that special structure of the ZnO nanowires could provide direct electrical pathways for the fast electron transport and Co 3 O 4 /NiCo 2 O 4 double-shell nanocages provide abundant mesopores and large specific surface area to enhance the catalytic activity of H 2 O 2 detection. These results suggest that the ZnO/Co 3 O 4 /NiCo 2 O 4 /Ni foam could be considered as a promising electrode material to build electrochemical biosensor.
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高影响因子
International Journal of Electrochemical Science
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2024
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IF 1.3
Ying Geng,Chun-yong Zhang,Lin Zhu,Hao-yu Wang,Ji-rong Bai,Jing-jing Huang,Zhen-long Zhao
s Polymer catalyst electrodes have good electrical conductivity, high mechanical strength and other characteristics, which have good prospects in the future market of green and low carbon. In this paper, the electrode of PEDOT polymer catalyst is studied, and the electrochemical performance of the electrode is improved by doping different metals. This study describes the design of PEDOT-Co 3 O 4 @Mn 3 O 4 /Mn 2 O 3 catalysts by simple solvothermal synthesis. As a catalyst in the hydrogen evolution reaction (HER), the overpotential of the same polarization curve is much smaller than that of PEDOT, with a Tafel slope of 118.21 mV dec ‐1 , by electrochemical and characterization analysis. In the test of the supercapacitor performance, it has a large specific capacitance of 1298.5 Fg -1 and a small electrical impedance (0.21 Ω). After 2000 cycles of CV test, the capacitance remains 87.76 %, and the curve shape is stable, which proves that it has good electrochemical performance. Our results confirm the materials have great application prospects in HER and capacitors.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Haonan Zhu,Fangyuan Wang,Yingying Cao,Yuhai Yang,Siyu Yang,Zipeng Zou,Fengjie Hu,Feng Chen,Jianping Qiu,Shuang Song
Nb 2 O 5 based photocatalysts have garnered significant attention in the field of antibiotic photodegradation due to their potential. Enhancing the efficiency of carrier separation efficiency still remains a crucial factor for optimizing photocatalytic performance. Herein, a Nb 2 O 5 /Co 3 O 4 p–n heterojunction photocatalyst was synthesized by a straightforward one-step hydrothermal method. The Nb 2 O 5 /Co 3 O 4 composites effectively utilized visible light to catalytically degrade norfloxacin, achieving 89.2% degradation in 90 min. This performance was 2.68 and 7.42-fold greater than pure Nb 2 O 5 and Co 3 O 4 , respectively. Furthermore, this composite maintained its high activity through five cycles of photocatalysis. The exceptional performance was creditable to the establishment of p-n heterojunction structure between Nb 2 O 5 and Co 3 O 4 , which effectively inhibited the electron-hole recombination and distinctly broadens the visible light adsorption region. •O 2 − and h + were confirmed as the critical active species in this process. The primary degradation pathways for norfloxacin were decarboxylation and ring-opening. This study introduced an innovative method for developing and fabricating flower-like Nb 2 O 5 -based heterojunctions for enhancing photocatalytic efficiency. This approach held significant promise for the effective treatment of antibiotic-contaminated wastewater through photocatalysis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Yujin Li,Mingzhu Qiu,Peiqing Guo,Xuefang Lei,Shaohui Li,Ran Meng,Nali Chen,Dongxia Zhang,Xibin Zhou
Hydrogen peroxide (H 2 O 2 ) is an environmentally friendly intermediate in the environmental field and also plays an important role in human metabolism, but the production and accumulation of excessive H 2 O 2 will cause harm to the human body, resulting in serious damage to cells. Therefore, N-doped graphene quantum dots Fe 3 O 4 /Co 3 O 4 nanoparticles with core-shell structure were prepared by in-situ synthesis and precipitation. The experimental results show that the prepared Co 3 O 4 nanoparticles have more efficient peroxidase activity than Co 3 O 4 nanoparticles alone. It can catalyze the oxidation of 3, 3, 5, 5-tetramethylbenzidine (TMB) to produce a blue product (TMBox) in the presence of H 2 O 2 . In addition, Co 3 O 4 with negative charge in the shell can produce a strong electrostatic driving coordination effect with positively charged TMB, which enhances the affinity between the nanoparticles and the substrate, and selectively catalyzes H 2 O 2 oxidation of colorless TMB to turn it blue. Based on these experimental results, a simple, low-cost, and efficient colorimetric method for H 2 O 2 detection was established, which showed a sensitive response to H 2 O 2 in the range of 0.02–2.5 μM with a detection limit of 2.3 nM. In addition, due to the magnetic properties of the prepared nanoparticles, they could be easily recovered by applying a magnetic field. This research provides a viable approach for magnetic nanomaterials with encouraging prospects for environmental monitoring, biosensing, and more.
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高影响因子
Journal of Energy Storage
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2025
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IF 9.8
Jin-hua Zhang,Peng-jie Zhu,Yan-zhen Liu,Xiang-ru Zhu,Yong-feng Li,Cheng-Meng Chen
The construction of heterostructured energy storage and conversion with special morphology has the potential to be an up-and-coming area of research. In this study, we designed and synthesized a Co₃O₄/g-C₃N₄ heterostructured electrode material with a distinctive morphology using a multistep fabrication approach. The heterojunction formed between Co₃O₄ and g-C₃N₄ induces interfacial charge redistribution, resulting in a built-in electric field that facilitates efficient electron transfer and enhances the electronic structure. Furthermore, the engineered morphology, comprising nanocages and hollow tubes, significantly increases the number of electrochemically active sites. The optimized electrode achieved an impressive specific capacity of 921.8 F g −1 at a current density of 1 A g −1 , along with excellent cycling stability, retaining 82.88 % of its initial capacity after 10,000 cycles. Moreover, an asymmetric supercapacitor constructed with Co₃O₄/g-C₃N₄ as the positive electrode and activated carbon as the negative electrode demonstrated a stable and high energy density of 36.3 Wh kg −1 .
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2012
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IF 5.625
Ting Bao,Zhongkui Zhao,Yitao Dai,Xiaoli Lin,Ronghua Jin,Guiru Wang,Turghun Muhammad
CO preferential oxidation (PROX) reactions were performed over the supported Co 3 O 4 -CeO 2 catalysts on modified activated carbon (AC) for eliminating the trace CO from H 2 -rich gases. The effects of support modification by H 2 O 2 oxidation treatment , catalyst calcination temperature, Ce/Co atomic ratio ( n Ce/Co ), Co 3 O 4 -CeO 2 loading and reaction parameters on catalytic properties of the Co 3 O 4 -CeO 2 /AC catalysts were investigated. Various characterization techniques like scanning electron microscopy (SEM), X-ray diffraction (XRD) and H 2 temperature-programmed reduction (H 2 -TPR) were employed to reveal the relationship between catalysts nature and catalytic performance. Results illustrate that the supported Co 3 O 4 -CeO 2 catalyst on modified AC exhibits excellent catalytic properties, which highly depends on dispersity and reducibility of Co 3 O 4 affected by the time of support treatment ( t p ), calcination temperature, n Ce/Co and loading. The supported 35 wt% Co 3 O 4 -CeO 2 catalyst (1:8 of n Ce/Co ) on the modified AC with H 2 O 2 oxidation treatment for 6 h demonstrates the best catalytic properties and the almost complete CO transformation takes place in a wide temperature range of 125–190 °C. Moreover, it is also found that the developed catalyst exhibits an outstanding catalytic stability, and 100% CO conversion can be maintained as the time on stream evolutes up to 1800 min even in the presence of CO 2 and H 2 O in the feed. The optimized Co 3 O 4 -CeO 2 /AC may be a robust and promising catalyst for eliminating trace CO from H 2 -rich gases.
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高影响因子
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