Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 288, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120037
Keywords
Borides; Amorphous phase; Surface reconstruction; Anion etching; Oxygen evolution reaction
Funding
- Australian Research Council (ARC) Future Fellowship [FT160100195]
- National Natural Science Foundation of China [21777045, 61875119]
- Foundation of Shenzhen Science, Technology and Innovation Commission (SSTIC) [2020231312, JCYJ20190809144409460]
- Natural Science Funds for Distinguished Young Scholar of Guangdong Province, China [2020B151502094]
- China Scholarship Council (CSC)
- Polish National Agency for Academic Exchange (Narodowa Agencja Wymiany Akademickiej (NAWA)) project [POWR.03.03.00-00-PN13/18]
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The study successfully obtained an efficient FeB pre-catalyst with accelerated surface reconstruction and regulated intrinsic activity of evolved FeOOH through W and P co-doping, demonstrating excellent OER activity and stability in alkaline electrolyte that surpasses most boride-based OER catalysts.
Designing cost-effective oxygen evolution reaction (OER) electrocatalysts is essential for sustainable water splitting. Recently, amorphous transition metal borides (TMBs) as OER pre-catalysts have acquired growing attention due to their favorable characteristics such as high conductivity, compositional and structural flexibility. Nevertheless, rational design of boride-based OER pre-catalysts remains an ongoing challenge. Herein, an efficient pre-catalyst derived from FeB with accelerated surface reconstruction and regulated intrinsic activity of evolved FeOOH is obtained by W and P co-doping. The obtained catalyst demonstrates an excellent OER activity with a low overpotential of 209 mV at a current density of 10 mA cm(-2), and good stability in alkaline electrolyte, which surpasses most of boride-based OER catalysts. Specifically, the anion etching facilitates the surface reconstruction and accelerates the mass/charge transfer. Density functional theory calculations suggest W doping can enhance intrinsic catalytic activity via optimizing the adsorption free energy of reaction intermediates and improving the conductivity. Additionally, the hierarchical structure and amorphous feature also benefit the OER process. This study provides a fundamental insight into the correlation between surface structure and catalytic activity, and a powerful strategy to construct efficient OER pre-catalysts.
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