Ultrathin Iron-Cobalt Oxide Nanosheets with Abundant Oxygen Vacancies for the Oxygen Evolution Reaction.
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TLDR
A facile solution reduction method using NaBH4 as a reductant is developed to prepare iron-cobalt oxide nanosheets (Fex Coy -ONSs) with a large specific surface area, ultrathin thickness, and, importantly, abundant oxygen vacancies that could improve electronic conductivity and facilitate adsorption of H2 O onto nearby Co3+ sites.Abstract:
Electrochemical water splitting is a promising method for storing light/electrical energy in the form of H2 fuel; however, it is limited by the sluggish anodic oxygen evolution reaction (OER). To improve the accessibility of H2 production, it is necessary to develop an efficient OER catalyst with large surface area, abundant active sites, and good stability, through a low-cost fabrication route. Herein, a facile solution reduction method using NaBH4 as a reductant is developed to prepare iron-cobalt oxide nanosheets (FexCoy-ONSs) with a large specific surface area (up to 261.1 m2 g−1), ultrathin thickness (1.2 nm), and, importantly, abundant oxygen vacancies. The mass activity of Fe1Co1-ONS measured at an overpotential of 350 mV reaches up to 54.9 A g−1, while its Tafel slope is 36.8 mV dec−1; both of which are superior to those of commercial RuO2, crystalline Fe1Co1-ONP, and most reported OER catalysts. The excellent OER catalytic activity of Fe1Co1-ONS can be attributed to its specific structure, e.g., ultrathin nanosheets that could facilitate mass diffusion/transport of OH− ions and provide more active sites for OER catalysis, and oxygen vacancies that could improve electronic conductivity and facilitate adsorption of H2O onto nearby Co3+ sites.read more
Citations
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Journal ArticleDOI
Atomically Embedded Ag via Electrodiffusion Boosts Oxygen Evolution of CoOOH Nanosheet Arrays
TL;DR: Layered cobalt (oxy) hydroxides have received much attention as cost-effective and efficient catalysts for the oxygen evolution reaction (OER) for electrochemical water splitting as mentioned in this paper.
Journal ArticleDOI
Disordering the Atomic Structure of Co(II) Oxide via B-Doping: An Efficient Oxygen Vacancy Introduction Approach for High Oxygen Evolution Reaction Electrocatalysts
TL;DR: DFT calculation results reveal that the oxidation of *OOH is the rate-limiting step for O-vacancies enriched CoO in the OER and that the presence of O- vacancies can efficiently lower the reaction barrier for breaking CoO bond, contributing to the improvement of OER kinetics.
Journal ArticleDOI
Advanced Oxygen Electrocatalysis in Energy Conversion and Storage
Huan Yang,Xiaotong Han,Abdoulkader Ibro Douka,Lei Huang,Lanqian Gong,Chenfeng Xia,Ho Seok Park,Bao Yu Xia +7 more
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Cobalt/Iron(Oxides) Heterostructures for Efficient Oxygen Evolution and Benzyl Alcohol Oxidation Reactions
Yiyin Huang,Rui Yang,Ganesan Anandhababu,Jiafang Xie,Jiangquan Lv,Xiaotao Zhao,Xueyuan Wang,Maoxiang Wu,Qiaohong Li,Yaobing Wang +9 more
TL;DR: In this article, a cobalt/iron(oxides) heterostructures with interface engineering for regulating surface structure properties toward enhanced oxygen evolution reaction (OER) and benzyl alcohol oxidation (BAO) are demonstrated.
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Ni/MoC heteronanoparticles encapsulated within nitrogen-doped carbon nanotube arrays as highly efficient self-supported electrodes for overall water splitting
TL;DR: In this article, a nitrogen-doped carbon nanotube (NCNT) arrays are successfully constructed on the carbon cloth (CC) as bifunctional catalysts for overall water splitting via a facile strategy.
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