期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201800175
关键词
bifunctional electrocatalysts; full water splitting; hydrogen evolution reaction; oxygen evolution reaction; single-crystallized carbonate hydroxide
类别
资金
- National Nature Science Foundation of China [21790050, 21790051]
- National Key Research and Development Project of China [2016YFA0200104]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-SLH015]
The controllable synthesis of single-crystallized iron-cobalt carbonate hydroxide nanosheets array on 3D conductive Ni foam (FCCH/NF) as a monolithic oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) bifunctional electrocatalyst for full water splitting is described. The results demonstrate that the incorporation of Fe can effectively tune the morphology, composition, electronic structure, and electrochemical active surface area of the electrocatalysts, thus greatly enhancing the intrinsic electrocatalytic activity. The optimal electrocatalyst (F0.25C1CH/NF) can deliver 10 and 1000 mA cm(-2) at very small overpotentials of 77 and 256 mV for HER and 228 and 308 mV for OER in 1.0 m KOH without significant interference from gas evolution. The F0.25C1CH-based two-electrode alkaline water electrolyzer only requires cell voltages of 1.45 and 1.52 V to achieve current densities of 10 and 500 mA cm(-2). The results demonstrate that such fascinating electrocatalytic activity can be ascribed to the increase in the catalytic active surface area, facilitated electron and mass transport properties, and the synergistic interactions because of the incorporation of Fe.
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