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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Achieving highly efficient electrocatalytic oxygen evolution with ultrathin 2D Fe-doped nickel thiophosphate nanosheets
TL;DR: In this paper, ultrathin single-crystalline Fe-doped nickel thiophosphate (NiPS3) nanosheets prepared in large scale by an easy solid-state method were demonstrated to be highly efficient OER electrocatalysts.
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Nanometric Ni5P4 Clusters Nested on NiCo2O4 for Efficient Hydrogen Production via Alkaline Water Electrolysis
Tao Zhang,Kena Yang,Cheng Wang,Shanyu Li,Qiqi Zhang,Xuejiao Chang,Juntao Li,Simo Li,Shuangfeng Jia,Jianbo Wang,Lei Fu +10 more
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Direct chemical synthesis of ultrathin holey iron doped cobalt oxide nanosheets on nickel foam for oxygen evolution reaction
TL;DR: In this paper, the authors reported that in-situ direct growth of atomically thick Fe doped Co3O4 holey nanosheets on nickel foam (Fe-Co 3O4 H-NSs/NF) using a simple cyanogel−NaBH4 route, which effectively avoids the tedious post-etch process of nanosaets using plasma, acid, alkali, and so on.
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Simple and cost effective fabrication of 3D porous core-shell Ni nanochains@NiFe layered double hydroxide nanosheet bifunctional electrocatalysts for overall water splitting
Zhengyang Cai,Xiuming Bu,Ping Wang,Su Wenqiang,Renjie Wei,Johnny C. Ho,Junhe Yang,Xianying Wang +7 more
TL;DR: In this article, a simple magnetic field-assisted method is used for the in situ growth of Ni nanochain cores with large surface areas, allowing the subsequent vertical growth of few-layered NiFe LDH nanosheets to form densely packed shells.
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Sulfur‐Modified Oxygen Vacancies in Iron–Cobalt Oxide Nanosheets: Enabling Extremely High Activity of the Oxygen Evolution Reaction to Achieve the Industrial Water Splitting Benchmark
Linzhou Zhuang,Yi Jia,Hongli Liu,Zhiheng Li,Mengran Li,Longzhou Zhang,Xin Wang,Dongjiang Yang,Zhonghua Zhu,Xiangdong Yao +9 more
TL;DR: The oxygen vacancies of defective iron-cobalt oxide (FeCoO -Vo) nanosheets are modified by the homogeneously distributed sulfur (S) atoms, enabling FeCoO x -Vo-S to exhibit much superior OER activity.
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