Trace tungsten and iron-doped nickel hydroxide nanosheets for an efficient oxygen evolution reaction
| Autor: | Chun Li, Junwei Ye, Guiling Ning, Hongchang Pang, Peng Tian, Weitao Gong |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Tafel equation
Renewable Energy Sustainability and the Environment Chemistry Inorganic chemistry Oxygen evolution Energy Engineering and Power Technology chemistry.chemical_element Overpotential Catalysis chemistry.chemical_compound Nickel Fuel Technology X-ray photoelectron spectroscopy Hydroxide Cyclic voltammetry |
| Zdroj: | Sustainable Energy & Fuels. 4:2792-2799 |
| ISSN: | 2398-4902 |
| DOI: | 10.1039/d0se00205d |
| Popis: | FexNi1−x(O)OH has been proven to be an efficient, earth-abundant and nonprecious catalyst for the oxygen evolution reaction (OER). However, the weak binding of oxygenated intermediates and the exposure of a few active sites on NiFe hydroxides considerably hinder their catalytic activity. Based on the fact that the W6+ ions possess higher valency. and similar ionic radius with respect to the Fe2+, Fe3+, and Ni2+ ions, which can modulate the (NiO6) crystal structure and enhance the interaction of block electrons, we have tried to introduce a trace amount of W6+ into FexNi1−x(O)OH. To our surprise, the target product Fe0.03W0.03–Ni LDHB exhibited the lowest overpotential of 205(±3) mV at 10 mA cm−2, Tafel slope of 60 mV dec−1, and no obvious decrease in the electrocatalytic activity after more than 50 hour operation or 3000 cyclic voltammetry cycles. X-ray diffraction, Raman spectroscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy and electrochemical studies revealed a synergistic interplay among tungsten, iron and nickel for producing a favorable local coordination environment and electronic structure, which enhanced the OER performance. |
| Databáze: | OpenAIRE |
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