期刊
NANO ENERGY
卷 47, 期 -, 页码 257-265出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2018.02.048
关键词
2D nanomaterials; NiPS3 nanosheets; Fe-doping; Electrocatalysis; Oxygen evolution reaction
类别
资金
- Singapore MOE AcRF [RG113/15, 2016-T1-002-062-002]
- Singapore EMA project EIRP [12/NRF2015EWT-EIRP002-008]
Exploring earth-abundant electrocatalysts to realize efficient oxygen evolution reaction (OER) is highly desired for developing sustainable electrochemical energy storage and conversion technologies. Herein, 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. The density functional theory (DFT) calculations reveal that the Fe-doping effectively decreases the energy barrier of OER path by reducing the binding of the oxygen-containing species on the surface of NiPS3. As such, the Fe-doped NiPS3 nanosheets show a low overpotential of 256 mV to reach a current density of 30 mA cm(-2) and a small Tafel slope of 46 mV dec(-1). To our knowledge, this is one of the best OER electrocatalysts in alkaline medium to date. The in-depth mechanism study demonstrates that the in-situ formed Fe-doped nickel oxides/hydroxides shell, resulting from the surface oxidation during the OER process, not only may serve as favorable electrocatalytic species but also improves the chemical stability of the Fe-doped NiPS3 in alkaline electrolyte. This work provides a new perspective for designing highly efficient OER electrocatalysts based on the ternary two-dimensional layered metal thiophosphates.
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