期刊
APPLIED SURFACE SCIENCE
卷 605, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.154743
关键词
Oxygen evolution reaction; Surface reconstruction; Water splitting; Iron doping; Ni-based electrocatalysts
类别
资金
- National Natural Science Foundation of China [52002294]
- Key Research and Development Program of Hubei Province [2021BAA208]
- Knowledge Innovation Program of Wuhan-Shuguang Project [2022010801020364]
- City University of Hong Kong Donation Research Grant [9229021]
- Shenzhen - Hong Kong Innovative Collaborative Research and Development Program [SGLH20181109110802117, CityU 9240014]
A good understanding of the reconstruction process and catalytic mechanism of nonnoble transition metal electrocatalysts in OER is crucial for efficient and energy-saving hydrogen production. In this study, Fe-doped NiO nanosheet arrays were prepared, facilitating energy-efficient surface reconstruction, activation of more Ni3+ species, and generation of more oxygen vacancies to enable fast and efficient OER.
A good understanding of the strategy to improve the reconstruction process and catalytic mechanism of nonnoble transition metal electrocatalysts in the oxygen evolution reaction (OER) is crucial to achieving highefficiency and energy-saving hydrogen production because it is considered the rate-determining step in water splitting. In this work, Fe-doped NiO nanosheet arrays are prepared on carbon cloth (Fe/NiO/CC) by a simple solution method and subsequent sonication. The Fe dopants facilitate energy-efficient and rapid surface reconstruction, activate more Ni3+ species, and generate more oxygen vacancies to enable fast and efficient OER. As a result, an overpotential of merely 288 mV is required for a current density of 100 mA cm(-2) by the Fe/NiO/CC electrocatalyst and a small Tafel slope of 72.6 mV dec(-1) is observed in the alkaline electrolyte. Based on densityfunctional theory calculation, the difference in the bonding and charge redistribution in NiO caused by Fe dopants modulates the electronic structure and coordination unequally, consequently increasing the number of active sites and enhancing the intrinsic catalytic activity as well. The results provide a deeper understanding of how heteroatom doping modulates the intrinsic activity of active atoms in transition metal-based electrocatalysts and reveal the role in reconstruction in electrocatalytic OER.
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