JOURNAL OF MATERIALS SCIENCE
·
2024
·
IF 3.5
Ma Shuwen,Zhu Binji,Gan Ruihui,Wang Yue,Zhou Bangguo,Shi Jingli,Song Yan,Shao Xiaodong,Ma Chang
The development of highly active non-precious metal bifunctional oxygen catalysts is of great significance in improving the efficiency of zinc-air batteries (ZABs). In this work, Co 3 O 4 is modified by a simple sulfur-doping strategy, which achieves a sulfur-doped Co 3 O 4 (S-Co 3 O 4 ) with significantly-enhanced oxygen catalytic activity. The doping of sulfur promotes the exposure of cobalt active sites and brings abundant oxygen vacancies, which provide additional active sites and enhance the conductivity of Co 3 O 4 . Consequently, S-Co 3 O 4 exhibits a low overpotential of 318 mV in the oxygen evolution reaction (OER) and an improved half-wave potential (0.788 V) for oxygen reduction reaction (ORR). In addition, the sulfur doping increases the ORR kinetic current density of pristine Co 3 O 4 by a factor of 49. The assembled ZABs based on S-Co 3 O 4 cathodes show a higher peak power density (98.90 mW cm −2 ) than the commercial Pt/C + RuO 2 -based ZABs. This work reveals that the intrinsic oxygen catalytic activity of Co 3 O 4 can be significantly strengthened by sulfur doping, which can modify its structural characteristics and introduce structural defects. Graphical abstract
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Electrocatalysis
·
2024
·Vol. 15
·期 4
·344-352
·
IF 2.7
Zhang Xihuan,Jaouhari Abdelhadi El,Li Chunyue,Adnane Maimoune,Liu Wanying,Mellalou Abderrahman,Ghamouss Fouad,Lin Yuanhua
The oxygen evolution reaction (OER) holds pivotal importance in sustainable energy conversion, as it forms the critical half-reaction in various electrochemical processes, including water splitting for hydrogen production and rechargeable metal-air batteries. Here, a CoFe 2 O 4 @Co 3 O 4 nano-composite was synthesized using a facile hydrothermal process and deposited onto the surface of nickel foam through electrophoresis. Characterization using XRD, Raman spectroscopy, and XPS confirmed the successful synthesis of the composite, exhibiting characteristic peaks of both Co 3 O 4 and CoFe 2 O 4 . The nano-composite exhibited a more amorphous phase than pure oxides, benefiting electrocatalytic activity. Scanning and transmission electron microscopy highlighted the composite’s morphological characteristics, showcasing a Co 3 O 4 island distribution on the CoFe 2 O 4 surface. Electrochemical evaluations revealed the superior oxygen evolution reaction (OER) performance of CoFe 2 O 4 @Co 3 O 4 , with low overpotentials, faster kinetics, and enhanced stability compared to pure oxides and the benchmark RuO 2 catalyst. A comprehensive analysis was carried out to investigate the dynamic behavior during electrocatalytic oxygen evolution reaction. This study unveils the intricate charge and electron transfer mechanisms between cobalt and iron atoms, providing insights into their collaborative role throughout the OER process. Graphical Abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Cong Wang,Shaoyi Jia,Yongchao Zhang,Yao Nian,Yan Wang,You Han,Yong Liu,Haitao Ren,Songhai Wu,Kexin Yao,Xu Han
SO 4 − and OH radicals are important oxidative species that play important roles in the oxidation of organic contaminants by peroxomonosulfate (PMS)/persulfate (PS) and Co 3 O 4 under acidic conditions. However, the facet effect of Co 3 O 4 on the catalytic oxidation of phenol by PS under alkaline conditions has not been investigated yet. In this study, we synthesized three Co 3 O 4 nanoparticles with different facets [rod (110), cube (100) and octahedra (111)]. The Co 3 O 4 rods show the highest catalytic reactivity in the oxidation of phenol by PS, followed by Co 3 O 4 cubes and Co 3 O 4 octahedra. Quenching experiments and EPR analysis rule out contributions of SO 4 − , OH, O 2 − and 1 O 2 to phenol oxidation and suggest that H-abstraction from phenol to phenoxyl radicals is an important pathway in all Co 3 O 4 -PS systems. The analysis of total organic carbon (TOC) and solid characterizations reveal that more than 96.6 % phenol has been transformed into polyphenols, instead of being mineralized into smaller organic molecules or CO 2 in the rod-PS-phenol system. The DFT (density functional theory) calculations further confirm that PS is more readily activated via a non-radical pathway on the Co 3 O 4 (110) plane with appropriate Co(II)-Co(II) distances, and the activated O O bonds then abstract H atoms from phenol molecules with the production of phenoxyl radicals, as well as SO 4 − and OH radicals. The produced phenoxyl radicals then link together to form dimers, trimers, oligomers and eventually insoluble polymers. This study not only enriches our understanding on the facet effect of different Co 3 O 4 in the oxidation of phenol, but also gives new insight into turning phenolic wastes into polyphenol "treasures".
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2024
·
IF 3.8
Yuxin Sun,Yunshuo Wu,Zhuoyi Zhang,Xuanhao Wu,Haiqiang Wang,Zhongbiao Wu
Graphical Ce-Pr co-doped Co 3 O 4 achieved 100% N 2 O conversion at 400 °C over Pr 0.02 Ce 0.2 Co 1 . The introduction of Ce facilitated the formation of oxygen vacancies, which were essential for N 2 O activation. But these Ce species strictly inhibited Co 3 O 4 crystallization and surface exposure, which were unfavorable to N 2 O decomposition. By the codoping of Pr, these negative effects were eliminated, leading to remarkable catalytic performance. Nitrous oxide (N 2 O) has gained increasing attention as a non-carbon dioxide greenhouse gas, and catalytic decomposition is an effective method for mitigating its emissions. In this study, Ce-Pr Co-doped Co 3 O 4 was synthesized via a coprecipitation method and used for the catalytic decomposition of N 2 O. The experimental results revealed that the N 2 O decomposition achieved 100% conversion at 400 °C on the catalyst with a Pr/Ce/Co molar ratio of 0.02:0.2:1, exhibiting an 80 °C decrease of T 100 compared with that of Co 3 O 4 . The introduction of Ce reduced the size and crystallization of Co 3 O 4 particles, increased the activity of the lattice oxygen of Co 3 O 4 , and facilitated the formation of oxygen vacancies, thereby enhancing the activation of N 2 O. However, the introduction of Ce inhibited the crystallization of Co 3 O 4 and the surface coverage of CeO 2 decreased the exposure degree of N 2 O molecules to the Co 3 O 4 surface. Co-doping strategy of Ce-Pr was performed to alleviate the negative effects of ceria. Consequently, the incorporation of Ce and Pr species enhanced the redox properties of Co 3 O 4 , leading to remarkable catalytic performance of N 2 O decomposition. This study elucidated the interaction between Ce and Pr dopants and Co 3 O 4 , and encouraged more attention on designing novel catalysts for N 2 O mitigation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2021
·Vol. 128
·期 1
·1-14
·
IF 2.584
Chen Peng,Wu Keliang,Peng Xiang,Ma Yue,Yang Xuqi,Duan Xinping,Ma Yan,Liu Zhiyong
Hydrogen and oxygen production based on photocatalytic monolithic water splitting is considered to be one of the effective ways to produce sustainable and clean energy. The key challenge in this process is to develop new photocatalysts that can simultaneously produce H 2 and O 2 at a stoichiometric ratio of 2:1 without the use of any sacrificial agents. In order to solve this problem, highly efficient and ingenious photosystems in nature have been studied intensively. Herein, we prepared printable Z-type composite photocatalysts CdS@TiO 2 /Pt/ITO/WO 3 /Co 3 O 4 mimicking biological vegetative leaves in nature and constructed an “artificial leaf” device that completely decomposes water. We use an electron solid penetrating transporter ITO, which can rapidly transfer photogenerated electrons and photogenerated holes and reduce the compound rate of photogenerated carriers. Thus, the efficiency of photocatalytic total water dissolution is enhanced. This photocatalyst was able to produce both H 2 and O 2 in water with an H 2 production rate of 75.93 μmol g −1 h −1 and an O 2 production rate of 36.49 μmol g −1 h −1 . We designed the oxygen-producing photocatalyst WO 3 /Co 3 O 4 , which produced oxygen at a rate of 159.21 μmol g −1 h −1 6 times higher than that of WO 3 alone. Furthermore, the morphology, composition, and microstructures of the photocatalyst were characterized by field-emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and nitrogen adsorption–desorption.
研究领域:
材料科学
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化学工程
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环境科学
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纳米技术
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 41
·23397-23403
·
IF 2.936
Zhuo-Liang Jiang,Jing Xie,Cong-Shan Luo,Meng-Yang Gao,Huan-Liang Guo,Mo-Han Wei,Hong-Jun Zhou,Hui Sun
The mechanism of Li–O2 batteries is based on the reactions of lithium ions and oxygen, which hold a theoretical higher energy density of approximately 3500 W h kg−1. In order to improve the practical specific capacity and cycling performance of Li–O2 batteries, a catalytically active mechanically robust air cathode is required. In this work, we synthesized a freestanding catalytic cathode with RuO2 decorated 3D web Co3O4 nanowires on nickel foam. When the specific capacity was limited at 500 mA h g−1, the RuO2–Co3O4/NiF had a stable cycling life of up to 122 times. The outstanding performance can be primarily attributed to the robust freestanding Co3O4 nanowires with RuO2 loading. The unique 3D web nanowire structure provides a large surface for Li2O2 growth and RuO2 nanoparticle loading, and the RuO2 nanoparticles help to promote the round trip deposition and decomposition of Li2O2, therefore enhancing the cycling behavior. This result indicates the superiority of RuO2–Co3O4/NiF as a freestanding highly efficient catalytic cathode for Li–O2 batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Zhongsen Yan,Binbin Li,Guohui Liu,Zhenyu Lu,Haiqing Chang,Juxiang Jin,Wenxin Dai,Yao Qu,Fangshu Qu
Humic acid (HA), a widely prevalent natural organic matter in aquatic environments, poses serious health risks due to its potential to form carcinogenic by-products during water treatment. While the photo-Fenton process can be employed for HA degradation, its effectiveness is often hindered by the poor catalytic performance of conventional catalysts. In this study, Co 3 O 4 was modified with nitrogen-doped carbon quantum dots (NCDs) and immobilized on a PVDF membrane. Compared with Co 3 O 4 /PVDF, Co 3 O 4 /NCDs/PVDF system achieved 85.1 % HA removal and 66 % mineralization within 60 min through photocatalytic peroxymonosulfate (PMS) activation as well as showed excellent stability in cycle experiments. The incorporation of NCDs enhanced the synergistic effect between light and PMS, improved light absorption due to the narrowed bandgap of Co 3 O 4 /NCDs/PVDF, and played a significant role in generating the primary reactive species, 1 O 2 . Additionally, Co 3 O 4 /NCDs/PVDF effectively controlled Co ions leaching. Finally, the degradation intermediates were identified, and the degradation pathways were proposed. The photo-Fenton degradation of HA preferentially broke unsaturated bonds and degraded aromatic ring compounds. The Co 3 O 4 /NCDs/PVDF photo-Fenton catalytic system serves as an effective approach for boosting the efficiency of photo-Fenton degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2019
·Vol. 25
·期 12
·6051-6059
·
IF 2.289
Zhang Yanqing,Huang Yanli,Feng Chuanqi,Zhang Yimin,Wu Huimin
In this work, Co 3 O 4 was synthesized by a simple hydrothermal and subsequent calcination treatment for electrochemical detection of H 2 O 2 . In order to improve the electrochemical performance of Co 3 O 4 , it is compounded with the carbon materials derived from cypress leaves, loofah sponge, and pine needles. The electrochemical tests suggested that Co 3 O 4 /loofah sponge-derived carbon showed higher electrochemical activity towards H 2 O 2 than the other two composites. The sensor based on Co 3 O 4 /loofah sponge-derived carbon exhibited a broad linear range from 5.00 μM to 11.40 mM, with a sensitivity of 47.83 μA mM −1 cm −2 and a detection limit of 1.50 μM ( S / N = 3). Thus, this novel nonenzymatic sensor had potential application in H 2 O 2 detection.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 6
·1-15
·
IF 2.8
Xiao Lijuan,Zhou Jingkai,Yu Zhixuan,Dong Huihao,Chen Yan
In the research of flexible smart electronics, obtaining particular structure electrodes to provide excellent electrochemical performance remains challenging. Here we report the synthesis and characterization of nanocomposite by a two-step method of polypyrrole (PPy) with Co 3 O 4 @SiO 2 in the presence of an oxidizing agent. Co 3 O 4 @SiO 2 was prepared by firing SiO 2 -coated zeolitic imidazolate framework-67 (ZIF-67/SiO 2 ) in a tubular furnace at a high temperature. Subsequently, PPy was coated and dispersed on Co 3 O 4 @SiO 2 by chemical methods at room temperature. In addition, we also explored the optimal ratio experiment of Co 3 O 4 @SiO 2 and PPy. The results show that the specific capacitance of Co 3 O 4 @SiO 2 and Co 3 O 4 @SiO 2 /PPy (2 mL) is 33.36 A/g and 107.7 A/g, at 0.6 A/g current density, indicating that the addition of PPy greatly improves the electrochemical performance of Co 3 O 4 @SiO 2 . This may be due to synergies between Co 3 O 4 @SiO 2 and PPy polymers, and the addition of PPy may help Co 3 O 4 @SiO 2 to construct more ion channels to enhance ion transport. This report will contribute to the development and application of cobalt oxide and silicon-shell electrode materials in the field of energy storage. It is helpful for the development and application of cobalt oxide and silicon-shell structures as electrode materials in the field of energy storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yan Wang,Ruitian Guo,Wei Liu,Linghua Zhu,Weibo Huang,Wei Wang,Honghe Zheng
Co 3 O 4 with high theoretical capacity and easily controllable structure attracts significant attention as the anode material for lithium-ion battery. In this work, Co 3 O 4 nanocubes, nanospheres and nanosheet clusters are prepared through a solvo-thermal procedure by altering the solvent compositions . When used as the anode material for lithium-ion battery, Co 3 O 4 nanospheres with a diameter of 500–800 nm composed of highly interconnected nanoparticles with 30 nm in diameter exhibit the optimal electrochemical performances. It exhibits an ultrahigh specific capacity of 1455 mAh g −1 at 0.2C. When the discharge current density increases 50 times, the electrode still delivers a specific capacity of 743 mAh g −1 . And it retains a high discharge capacity of 1262 mAh g −1 after 100 cycles at 0.1C. The relatively high specific surface area and porosity, as well as the stable structure, compactness of the solid electrolyte interphase film formed on the electrode are found to be the main factors for the excellent lithium storage performance of Co 3 O 4 nanospheres.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2016
·
IF 2.478
Junying Xue,Wenle Ma,Li Wang,Hongtao Cui
Co 3 O 4 quantum dots (QDs) with diameter of 3–5 nm were successfully prepared by a facile surfactant-free large-scale synthesis strategy at room temperature in ethanol. The formation of Co 3 O 4 QDs follows the sequence of Co 2+ + 2OH − → Co(OH) 2 → CoOOH → Co 3 O 4 . It is demonstrated that the dissolved oxygen and the bubbling of compressed air are the two keys for the synthesis of Co 3 O 4 QDs. The produced Co(OH) 2 was oxidized to CoOOH by the oxygen dissolving in ethanol. In order to synthesize pure phase Co 3 O 4 QDs, compressed air has to be bubbled into the solution vigorously to promote the decomposition of CoOOH by removing the oxygen evolved from the decomposition reaction. Due to small particle size and inherent properties of Co 3 O 4 , the QDs have excellent electrochemical performance and high long-term electrochemical stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Qu Qing,Zhang Jian-Hua,Wang Jing,Li Qing-Yu,Xu Chang-Wei,Lu Xihong
Considerable efforts have been devoted recently to design and fabrication of high performance and low cost electrocatalysts for oxygen evolution reaction (OER). However, catalytic activity of current electrocatalysts is usually restricted by high onset potential and limited active sites. Herein, we fabricated three-dimensional (3D) highly ordered mesoporous Pd-Co 3 O 4 composite materials as excellent electrocatalysts for OER in alkaline solution with high activity and stability. Three-dimensional highly ordered mesoporous Co 3 O 4 material was firstly synthesized using mesoporous silica KIT-6 as hard template. Then, Pd-Co 3 O 4 nanomaterials were prepared by a simple reduction method. The as-prepared 3D mesoporous Pd-Co 3 O 4 catalysts have ordered mesoporous structure with a high surface area of 81.0 m 2 g −1 . Three-dimensional highly ordered mesoporous structure can facilitate diffusion and penetration of electrolyte and oxygen. Moreover, the catalysts can also keep catalyst particles in a well dispersed condition with more catalytic active sites. Electrochemical measurements reveal that the 3D mesoporous Pd-Co 3 O 4 catalysts exhibit superior performance in alkaline solution with low onset potential (0.415 V vs . SCE) and excellent long-duration cycling stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）