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Fabrication of heteroatom-doped cobalt oxide yolk-shell microsphere using recycled solution from waste materials and their excellent electrochemical properties as an anode material for lithium-ion batteries

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Rare Metals 2024年第10期43卷 4934-4947页

作者： Yeong Beom Kim Chanho Kim Seung-Hyun Kim Yun Chan Kang Dongju Lee Gi Dae Park Department of Advanced Materials Engineering Chungbuk National UniversityChungbuk 28644Korea Department of Materials Science and Engineering Korea UniversitySeoul 136-713Korea Research Institute YKSintering Co.Ltd.Chungbuk 28581Korea

Heteroatom-doped transition metal oxides have attracted great attention as advanced anode materials for lithium-ion batteries due to their high theoretical capacity and superior ***,the limited resource availability has led to a substantial rise in prices for valuable metals such as Ni and Co,posing a significant challenge for their *** address this issue,recycling of these metals from waste materials have gained prominence,and particularly the recovery of Co has been mostly focused on its economic ***,we introduced a novel recycling strategy for fabrication of heteroatomdoped CoO_(x)(comprising mainly Co_(3)O_(4)with a minor CoO phase)anode with a yolk–shell structure for lithium-ion batteries,by separating Co from cemented tungsten carbide *** employing a simple leaching process and subsequent spray pyrolysis,the yolk–shell structured microsphere comprising CoO_(x)was successfully ***,the presence of other waste metals in the leachate facilitated multi-heteroatom doping during ***,the introduction of various dopants into CoO_(x)induced oxygen vacancy formation,thereby enhancing the electrochemical properties of the CoO_(x)*** a result,compared with the phase-pure(undoped)CoO_(x)yolk–shell,the heteroatom-doped CoO_(x)yolk–shell exhibited robust cycling stability(602 mAh·g^(-1)for 200 cycles at 1 A·g^(-1))and excellent rate capability(210 mAh·g^(-1)at 10 A·g^(-1)).

关键词： Recycling Heteroatom doping cobalt oxide Anode Lithium-ion batteries

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Biocompatibility and biotoxicity of in-situ synthesized carboxylated nanodiamond-cobalt oxide nanocomposite

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Journal of Materials Science & Technology 2017年第8期33卷 879-888页

作者： L.Syam Sundar Naser A.Anjum M.C.Ferro Eduarda Pereira Manoj K.Singh A.C.M.Sousa TEMA-Department of Mechanical Engineering University ofAveiroAveiroPortugal CESAM-Centrefor Environmental&Marine Studies and Department of Chemistry University of Aveiro3810-193AveiroPortugal CICECO Department of Material Engineering and CeramicsUniversity of AveiroPortugal

A nanocomposite that incorporates cobalt oxide（Co3O4） and nanodiamond（ND） can present both high magnetism（Co3O4） and high hardness（ND）. ND particles have potential applications in a variety of fields such as protein immobilization, biosensors, therapeutic molecule delivery and bio-imaging. However,limited information is available in literature on the in-situ synthesis of biocompatible magnetic materials and also on their potential biotoxicity as a result of their entry into environmental compartments and subsequent interaction with biota. In this work, a new kind of bio-compatible magnetic material –carboxylated nanodiamond（c ND） and Co3O4 was synthesized to obtain the c ND-Co3O4 *** synthesis procedure involved in-situ and chemical reduction of cobalt chloride（CoCl（26）H2O） and sodium borohydrate（NaBH4）. The synthesized cND-Co3O4 nanocomposite was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The cyto-genotoxicity of the synthesized nanocomposite material was studied by using onion（Allium cepa L.） as a test model with concentrations of 5, 10 and 20 μg/ml. The study was also extended to cND and Co3O4 materials for comparison purpose. Co3O4 and cND exhibited their contrasting effects on mitosis and other cyto-genotoxic indices studied herein. This work provided fundamental data on the synthesis and the bio-toxicity of the c ND-Co3O4 nanocomposite, which, in turn, can help to expand their multidisciplinary applications.

关键词： Nanodiamond cobalt oxide Nanodiamond Nanocomposite Bio-toxicity Allium cepa

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Porous cobalt oxide@Layered Double Hydroxide Core-Shell Architectures on Nickel Foam as Electrode for Supercapacitor

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 603-610页

作者： Zhang Luojiang Hui Kwan San Department of Electrical Engineering The Hong Kong Polytechnic University School of Mathematics University of East Anglia

The high performance of an electrode relies largely on a scrupulous design of nanoarchitectures and smart hybridization of electroactive materials.A porous core-shell architecture in which one-dimensional cobalt oxide(Co_3O_4)nanowire cores are grown on nickel foam prior to the growth of layered double hydroxide(LDH)shells is *** precipitation and thermal treatment result in homogeneous forests of 70-nm diameter Co_3O_4 nanowire,which are wrapped in LDH-nanosheet-built porous covers through a liquid phase deposition *** to the unique core-shell architecture and the synergetic effects of Co_3O_4and NiAl-LDH,the obtained Co_3O_4@LDH electrode exhibits a capacitance of 1 133.3F/g at a current density of 2A/g and 688.8F/g at 20A/g(5.3F/cm^(2 )at 9.4mA/cm^(2 )and 3.2F/cm^(2 )at 94mA/cm^2),which are better than those of the individual Co_3O_***,the electrode shows excellent cycling performance with a retention rate of 90.4%after 3 000cycles at a current density of 20A/g.

关键词： core-shell cobalt oxide layered double hydroxide(LDH) nickel foam supercapacitor(SC)

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Three-dimensional interconnected cobalt oxide-carbon hollow spheres arrays as cathode materials for hybrid batteries

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Progress in Natural Science:Materials International 2016年第3期26卷 253-257页

作者： Jiye Zhan Xinhui Xia Yu Zhong Xiuli Wang Jiangping Tu State Key Laboratory of Silicon Materials Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province and School of Materials Science and Engineering Zhejiang University

Hierarchical porous metal oxides arrays is critical for development of advanced energy storage ***, we report a facile template-assisted electro-deposition plus glucose decomposition method for synthesis of multilayer CoO/C hollow spheres arrays. The CoO/C arrays consist of multilayer interconnected hollow composite spheres with diameters of350 nm as well as thin walls of20 *** hollow spheres architecture with 3D porous networks are achieved. As cathode of high-rate hybrid batteries, the multilayer CoO/C hollow sphere arrays exhibit impressive enhanced performances with a high capacity(73.5 m Ahg-1at 2 Ag-1), and stable high-rate cycling life(70 m Ahg-1after12,500 cycles at 2 Ag-1). The improved electrochemical performance is owing to the composite hollowsphere architecture with high contact area between the active materials and electrolyte as well as fast ion/electron transportation path.

关键词： cobalt oxide Hollow spheres Cathode Arrays Hybrid battery

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A cobalt oxide@polydopamine-reduced graphene oxide-based 3D photothermal evaporator for highly efficient solar steam generation

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Tungsten 2020年第4期2卷 423-432页

作者： Ting Gao Xuan Wu Gary Owens Hao‑Lan Xu Future Industries Institute University of South AustraliaAdelaideSA 5095Australia

Improving the evaporation rate and energy efficiency of solar steam generation is very important to facilitate real-world applications for clean water *** this work,Co_(3)O_(4)@polydopamine(PDA)nanoparticles were synthesized and combined with reduced graphene oxide(rGO)to fabricate a new Co_(3)O_(4)@PDA-rGO photothermal *** obtained pho-tothermal aerogel sheet was thereafter used to prepare both two-dimensional(2D)and three-dimensional(3D)photothermal evaporators for solar steam *** to the excellent light absorption and hydrophilicity of the photothermal aerogel,a high evaporation rate of 1.60 kg·m^(−2)·h^(−1) was achieved for the 2D photothermal *** for the 3D evaporator,the evaporation rate was dramatically increased to 3.71 kg·m^(−2)·h^(−1) with a corresponding light-to-vapor energy efficiency of 107%.This was attributed to an increased evaporation surface area,decreased energy loss from the top evaporation surface to the environment,and energy gain from the environment on the side evaporation *** 3D evaporator also showed excellent practical performance in seawater desalination thus demonstrating great potential for real-world applications.

关键词： Solar-steam generation cobalt oxide Polydopamine Reduced graphene oxide Photothermal materials Seawater desalination

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Catalytic methanation reaction over alumina supported cobalt oxide doped noble metal oxides for the purification of simulated natural gas

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燃料化学学报 2012年第7期40卷 822-830页

作者： Wan Azelee Wan Abu Bakar Rusmidah Alil Abdul Aziz Abdul Kadir Salmiah Jamal Mat Rosid Nurul Shafeeqa Mohammad Department of Chemistry Faculty of Science Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Faculty of Petroleum and Renewable Energy Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

A series of alumina supported cobalt oxide based catalysts doped with noble metals such as ruthenium and platinum were prepared by wet impregnation *** variables studied were difference ratio and calcination ***/Co(10∶90)/Al2O3 catalyst calcined at 700 ℃ was found to be the best catalyst which able to convert 70.10% of CO2 into methane with 47% of CH4 formation at maximum temperature studied of 400 ℃.X-ray diffraction analysis showed that this catalyst possessed the active site Co3O4 in face-centered cubic and PtO2 in the orthorhombic phase with Al2O3 existed in the cubic *** to the FESEM micrographs,both fresh and spent Pt/Co(10∶90)/Al2O3 catalysts displayed small particle size with undefined *** Adsorption analysis showed that 5.50% reduction of the total surface area for the spent Pt/Co(10∶90)/Al2O3 ***,Energy Dispersive X-ray analysis(EDX) indicated that Co and Pt were reduced by 0.74% and 0.14% respectively on the spent Pt/Co(10∶90)/*** using FT-IR and TGA-DTA analysis revealed the existence of residual nitrate and hydroxyl compounds on the Pt/Co(10∶90)/Al2O3 catalyst.

关键词： natural gas cobalt oxide noble metal catalyst methanation reaction

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Catalytic performance of cobalt oxide-supported gold-palladium nanocatalysts for the removal of toluene and o-xylene

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Chinese Journal of Catalysis 2017年第2期38卷 207-216页

作者：王治伟刘雨溪杨涛邓积光谢少华戴洪兴北京工业大学环境与能源工程学院化学化工系绿色催化与分离北京市重点实验室区域大气复合污染防治北京市重点实验室催化化学与纳米科学实验室北京100124 阿威罗大学机械工程系葡萄牙阿威罗3810-193

Using the molten salt and polyvinyl alcohol-protected reduction method,we fabricated Co3O4 octahedron-supported Au-Pd（x（AuPdy）/Co3O4;x =（0.18,0.47,and 0.96） wt%;y（Pd/Au molar ratio） =1.85-1.97） *** molten salt-derived Co3O4 sample possessed well-defined octahedral morphology,with an edge length of 300 *** Au-Pd nanoparticles,with sizes of 2.7-3.2 nm,were uniformly dispersed on the surface of *** 0.96（AuPd1.92）/Co3O4 sample showed the highest catalytic activity for toluene and o-xylene oxidation,and the temperature required for achieving 90%conversion of toluene and o-xylene was 180 and 187 ℃,respectively,at a space velocity of 40000 mL/（g·h）.The high catalytic performance of Co3O4 octahedron-supported Au-Pd nanocatalysts was associated with the interaction between Au-Pd nanoparticles and Co3O4 and high concentration of adsorbed oxygen species.

关键词： Molten salt cobalt oxide Au-Pd nanoparticle Volatile organic compound Catalytic oxidation

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Synthesis temperature dependence of morphologies and properties of cobalt oxide and silicon nanocrystals

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Frontiers of Computer Science 2011年第3期5卷 311-321页

作者： Akimasa KOJI Javed IQBAL Rong-Hai YU Zheng-Jun ZHANG Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Metallurgy and Ceramics Science Tokyo Institute of Technology 2-12-10okayama Meguro-ku Tokyo 152-8552 Japan

cobalt and cobalt oxide nanocrystals were synthesized on Si substrates from aqueous cobalt nitrate [Co（NO3）2·6H2O] powder via chemical vapor deposition method. Scanning electron microscope, field emission scanning electron microscope, and transmission electron microscope observations show different morphologies, such as continuous films, nano-bars, nano-dices, and nano-strings, depending on the synthesis temperature. The crystal structure characterization was conducted using X- ray diffraction methods. Furthermore, the properties of the samples were characterized using Raman spectroscopic analysis and vibrating sample magnetometer. The morphology change was discussed in terms of synthesis environments and chemical interactions between cobalt, oxygen, and silicon.

关键词： cobalt oxide nanostructure temperature dependence magnetic property

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Preparation and catalytic behavior of reduced graphene oxide supported cobalt oxide hybrid nanocatalysts for CO oxidation

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Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2266-2274页

作者： Yan WANG Ze-hua CHEN Jing HUANG Gao-jie LI Jian-liang CAO Bo ZHANG Xing-ying CHEN Huo-li ZHANG Lei JIA College of Safety Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454003China Sinopec Research Institute of Petroleum Engineering China Petroleum Chemical CorporationBeijing 100101China Collaborative Innovation Center of CoalWork Safety of Henan Province Jiaozuo 454003China

The reduced graphene oxide （rGO） supported cobalt oxide nanocatalysts were prepared by the conventional precipitationand hydrothermal method. The as-prepared rGO-Co3O4 was characterized by the XRD, Raman spectrum, SEM, TEM, N2-sorption,UV-Vis, XPS and H2-TPR measurements. The results show that the spinel cobalt oxide nanoparticles are highly fragmented on therGO support and possess uniform particle size, and the as-prepared catalysts possess high specific surface area and narrow pore sizedistribution. The catalytic properties of the as-prepared rGO-Co3O4 catalysts for CO oxidation were evaluated through acontinuous-flow fixed-bed microreactor-gas chromatograph system. The catalyst with 30% （mass fraction） reduced graphene oxideexhibits the highest activity for CO complete oxidation at 100 ℃.

关键词： reduced graphene oxide cobalt oxide catalyst CO oxidation catalytic activity

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cobalt-iron oxide/black phosphorus nanosheet heterostructure:Electrosynthesis and performance of(photo-)electrocatalytic oxygen evolution

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Nano Research 2023年第5期16卷 6057-6066页

作者： Man Zhao Xiaoru Cheng He Xiao Jianru Gao Shoufeng Xue Xiaoxia Wang Haishun Wu Jianfeng Jia Nianjun Yang Key Laboratory of Magnetic Molecules&Magnetic Information Materials Ministry of Education The School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030000China Institute of Materials Engineering University of SiegenSiegen 57076Germany

Highly active,stable,and cut-price(photo-)electrocatalysts are desired to overwhelm high energy barriers for anodic oxygen evolution reaction ***,a heterostructure of cobalt-iron oxide/black phosphorus nanosheets is in-situ synthesized via a facile and novel three-electrode electrolysis *** black phosphorus is exfoliated into its nanosheets at the cathode while the CoFe oxide is derived directly from the metal wire anode during the electrolysis *** heterostructure exhibits excellent electrocatalytic oxygen evolution reaction(OER)performance,and the overpotential at 10 mA·cm^(−2)is 51 mV lower than that of the commercial RuO_(2)*** superior OER performance stems from the favorable adsorption behavior and an enlarged electrochemical active surface area of the *** reveal the origin of excellent OER performance from the point of adsorption strength of OH*,methanol oxidation reaction(MOR)test is applied under the identified OER operating *** introduction of light illumination enhances the OER activity of this *** overpotential drops down to 280 mV,benefiting from pronounced photochemical response of black phosphorus nanosheets and iron oxide inside the *** work develops a new electrochemical method to construct high performance and light-sensitive heterostructures from black phosphorus nanosheets for the OER.

关键词： electrosynthesis oxygen evolution reaction black phosphorus cobalt oxide iron oxide

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