期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 299, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120678
关键词
Ni075Fe0.25Se (2); P doping; Electronic structures; Adsorption energy; OER
资金
- National Natural Science Foundation of China [21802086]
- Shandong Provincial Natural Science Foundation [ZR2019MB048, ZR2020YQ09]
- QiLu Young Scientist Program of Shandong University
- Shenzhen Fundamental Research Program [JCYJ20190807093411445]
- Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong
The study reports a highly efficient electrocatalyst P-Ni0.75Fe0.25Se2 for water splitting on nickel foam, exhibiting low overpotential and stable activity. P doping can independently modulate the electronic structure of Fe, optimize the adsorption strength of OER intermediates at active sites and facilitate the OER kinetics.
The development of efficient and stable electrocatalysts to speed up the sluggish kinetics of water splitting has long been being the frontier of energy conversion research. Herein, we report a highly efficient electrocatalyst of P-Ni0.75Fe0.25Se2 prepared on nickel foam for overall water splitting. The optimal P-Ni0.75Fe0.25Se2 electrode exhibits an extremely low overpotential of 156 mV at 10 mA cm(-2) and 226 mV at 300 mA cm(-2) for oxygen evolution reaction (OER) and the highly efficient activity remains stable for up to 1000 h at 300 mA cm(-2). More importantly, the water-alkali electrolyzer of P-Ni0.75Fe0.25Se2 parallel to MoNi4/MoO2 requires only 1.45 V and 1.82 V to reach current densities of 10 and 300 mA cm(-2), respectively, outperforming that of RuO2 parallel to MoNi4/MoO2. Systematically theoretical and experimental results reveal that P doping can independently modulate the electronic structure of Fe without affecting Ni, optimize the adsorption strength of OER intermediates at active sites and consequently facilitate the OER kinetics.
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