期刊
CHEMICAL ENGINEERING JOURNAL
卷 424, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130337
关键词
Solid polymer electrolyte water electrolysis; Acidic water splitting; Core-shell structure; Oxygen evolution reaction; Hydrogen evolution reaction
资金
- National Natural Science Foundation of China [21703212]
- Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University [JDGD-202025]
This study reports a facile method to construct alpha-Ni(OH)(2)@Ir core-shell nanoparticles as bifunctional electrocatalyst for acidic overall water splitting application, which shows lower overpotentials and higher mass activities compared to benchmarked IrO2 and Pt/C.
The industrialization of solid polymer electrolyte water electrolysis (SPEWE) dominantly relies on electrocatalyst with high stability and efficiency for oxygen evolution reaction (OER) catalysis. In this work, we report a facile method to construct alpha-Ni(OH)(2)@Ir core-shell nanoparticles as bifunctional electrocatalyst for acidic overall water splitting application. alpha-Ni(OH)(2)@Ir requires lower overpotentials (238 mV and 20 mV) to achieve 10 mA cm(-2) in acidic OER and HER catalysis compared to benchmarked IrO2 (332 mV) and Pt/C (36 mV); meanwhile, the OER mass activity at 1.55 V vs. RHE was 92 fold higher than IrO2; HER mass activity at overpotential of 80 mV was 5 fold better than Pt/C. The boosted catalytic activity is due to the enhanced utilization efficiency of Ir stemmed from the ultrathin Ir shell (similar to 1 nm). Moreover, 1.49 V is demanded for alpha-Ni(OH)(2)@Ir to attain 10 mA cm(-2) in acidic overall water splitting, 110 mV lower than benchmarked Pt/C-IrO2 system. Meanwhile, stable catalytic performance is recorded for 20 h.
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