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Noble-metal-free cobalt hydroxide nanosheets for efficient electrocatalytic oxidation

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Frontiers of Chemical Science and Engineering 2020年第6期14卷 948-955页

作者： Jie Lan Daizong Qi Jie Song Peng Liu Yi Liu Yun-Xiang Pan Institute of Nano Biomedicine and Engineering Shanghai Engineering Research Centre for Intelligent Diagnosis and Treatment InstrumentDepartment of Instrument Science and EngineeringSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

cobalt hydroxide has been emerging as a promising catalyst for the electrocatalytic oxidation reactions,including the oxygen evolution reaction(OER)and glucose oxidation reaction(GOR).Herein,we prepared cobalt hydroxide nanoparticles(CoHP)and cobalt hydroxide nanosheets(CoHS)on nickel *** the electrocatalytic OER,CoHS shows an overpotential of 306 mV at a current density of 10 mA·cm^-*** is enhanced as compared with that of CoHP(367 mV at 10 mA·cm^-2).In addition,CoHS also exhibits an improved performance in the electrocatalytic *** improved electrocatalytic performance of CoHS could be due to the higher ability of the two-dimensional nanosheets on CoHS in electron *** results are useful for fabricating efficient catalysts for electrocatalytic oxidation reactions.

关键词： electrocatalytic oxidation cobalt hydroxide nanosheet water glucose

Unveiling the active sites of ultrathin Co-Fe layered double hydroxides for the oxygen evolution reaction

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Chinese Journal of Catalysis 2022年第8期43卷 2240-2248页

作者： Xue Bai Zhiyao Duan Bing Nan Liming Wang Tianmi Tang Jingqi Guan Institute of Physical Chemistry College of ChemistryJilin UniversityChangchun 130021JilinChina State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of ScienceShanghai 201210China CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety&CAS-HKU Joint Laboratory of Metallomics on Health and Environment Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

Two-dimensional layered double hydroxides(LDHs)have been identified as promising electrocatalysts for the oxygen evolution reaction(OER);however,the simple and effective synthesis of high-quality LDHs remains extremely challenging and the active sites have not been ***,we report a facile solution-reaction method for preparing an ultrathin(thickness<2 nm)nonprecious CoFe-based ***_(1)Fe_(0.2) LDH delivers a current density of 10 mA cm^(-2) and a high turnover frequency of 0.082 s^(-1) per total 3d metal atoms at a low overpotential of 256 *** mass activity is 277.9 A g^(-1) at an overpotential of 300 mV for the *** studies reveal the Co site as the main active center for the *** doped Fe lowers the reaction barrier by accelerating the charge-transfer *** calculations reveal that the surface Co sites adjacent to Fe atoms are the active centers for the OER and the subsurface Fe dopants excessively weaken the OH^(*)adsorption,thus increasing the energy barrier of the rate-determining *** study can guide the rational design of high-performance CoFe-based LDHs for water splitting.

关键词： cobalt hydroxide Iron hydroxide Layered double hydroxide Oxygen evolution reaction First-principle study

Promoting electrocatalytic alcohols oxidation coupled with H_(2) production via ligand intercalation strategy

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Nano Research 2023年第4期16卷 4596-4602页

作者： Li Li Zhiyuan Zhang Haotong Chen Fei Chen College of New Materials and Chemical Engineering Beijing Key Lab of Special Elastomeric Composite MaterialsBeijing Institute of Petrochemical TechnologyBeijing 102617China

Electrochemical alcohol oxidation,the alternate of oxygen evolution reaction,has been recognized as an effective way to produce value-added chemicals coupled with H2 ***,the current researches still suffer from the low reaction rate and Faradaic efficiency(FE)that limits the overall ***,we report a ligand intercalation strategy to enhance the current density of alcohol electrooxidation by intercalating sodium dodecyl sulfonate(SDS)in the interlayer of Co(OH)_(2)catalyst(Co(OH)_(2)-SDS).For instance,the Co(OH)_(2)-SDS shows obviously enhanced current density for glycerol electrooxidation than that of pure Co(OH)_(2).The corresponding glycerol conversion rate and H2 production rate reach 0.35 mmol·cm^(−2)·h^(−1)and 9.1 mL·cm^(−2)·h^(−1)at 1.42 V *** hydrogen electrode,which are 2.2-and 1.9-fold higher than that of Co(OH)_(2).The yield of formate reaches 86.6%with selectivity of 95.3%at high glycerol conversion of 95.1%(with FE of 83.3%for glycerol oxidation).The Co(OH)_(2)-SDS is demonstrated efficient for different alcohols with enhanced *** confirmed that the intercalation of SDS in Co(OH)_(2)can promote the generation and exposure of CoOOH reactive sites,and also facilitate the adsorption of alcohol,thus enabling high reaction rate.

关键词： electrocatalysis alcohol oxidation hydrogen cobalt hydroxide ligand intercalation

Phase-transfer synthesis of α-Co(OH)_2 and its conversion to CoO for efficient electrocatalytic water oxidation

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Science Bulletin 2017年第9期62卷 626-632页

作者： Dingyi Guo Fangfang Chen Wei Zhang Rui Cao School of Chemistry and Chemical Engineering Shaanxi Normal University Department of Chemistry Renmin University of China

Water splitting is an attractive way to produce recyclable hydrogen energy resource. The oxygen evolution reaction(OER) is the rate-determine step of water electrolysis. The exploring of low-cost, highly efficient and durable electrocatalysts for OER is thus extremely important. In this work, we developed a facile two-phase protocol to fabricate an α-Co(OH)_2 using sodium oleate as the phase-transfer *** crystallinity and structure of the α-Co(OH)_2 was regulated by heat treatments toward enhanced electrocatalytic OER activity. With the calcination of the as-prepared α-Co(OH)_2 at 200 °C, a networked and well-dispersed CoO nanoparticles were formed. The CoO sample afforded an OER current density of 10 mA cm^(-2) under a low overpotential of 312 mV in a 1 mol L^(-1) KOH aqueous solution. The high activity of the CoO material is believed to be associated with its ultra-small particle size and plentiful open spaces in the material, both of which can provide abundant surface catalytic sites.

关键词： Water oxidation cobalt oxide cobalt hydroxide Oxygen evolution reaction Electrocatalysis

Voltammetric Response and Electrocatalysis of Glassy Carbon Electrode Modified with Monolayer Nickel hydroxide

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Wuhan University Journal of Natural Sciences 1997年第1期2卷 90-94页

作者： Liu Shouqing Li Huiling Jiang Mian Li Peibiao

The glassy carbon (GC) electrode modified with a monolayer nickel hydroxide (GC/Ni(OH) 2) was prepared by immersion of GC substrate in 1.0×10 -3 mol/L NiSO 4 solution, and then cyclic voltammetric scanning in 0.20 mol/L KOH. Similarly, GC/Co(OH) 2 electrode was prepared too. The experiments showed that the voltammetric behavior of GC/Ni(OH) 2 electrode in 0.20 mol/L KOH is more stable than that of GC/ Co(OH) 2. It was found that the GC/Ni(OH) 2 electrode acts as an effective electrocatalysis for the oxidation of hydrazine.

关键词： glassy carbon modified electrode monolayer nickel hydroxide cobalt hydroxide electroctalysis hydrazine

A Study of Preparation of Lithium-ion Batteries Grade cobalt Sulphate by Solvent Extraction

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A Study of Preparation of Lithium-ion Batteries Grade Cobalt...