期刊
NANO ENERGY
卷 47, 期 -, 页码 199-209出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2018.02.051
关键词
Electrocatalysis; Perovskite oxide; Phosphorus; Oxygen evolution; Oxygen reduction
类别
资金
- National Natural Science Foundation of China [51502099, 51571096]
- Natural Science Foundation of Hubei Province [2016CFB129]
- Fundamental Research Funds for the Central Universities [HUST 2016YXMS211]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Start-up Research Grant, University of Macau [SRG2016-00092-IAPME]
- Science and Technology Development Fund, Macao S.A.R (FDCT) [081/2017/A2]
The strong desire for a clean and secure energy future has stimulated great interest in searching for low-cost, highly efficient electrocatalysts for regenerative fuel cells and rechargeable metal-air batteries. Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play a paramount role in the operation of these devices, but are notoriously sluggish even with precious metals-based catalysts. Here we report our findings in the development of a bifunctional catalyst based on phosphorus-doped LaFeO3-delta for ORR and OER in alkaline solutions. The remarkable electrocatalytic performance is attributed to larger amount of O-2(2-)/O- species, trace amount of Fe4+ species, and optimized e(g) electron filling (approximate to 1), benefiting from the doping effect of phosphorus. Both the mass activity and the specific activity are nearly doubled after P-doping. Density functional theory calculations also confirm that the increase in valence state of Fe ions is due mainly to phosphorus doping. These results demonstrate that non-metal element doping is an effective approach to optimizing the electronic configuration, changing valence states of ions, and thus enhancing activities of perovskite electrocatalysts.
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