期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 94, 期 -, 页码 59-63出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2018.08.009
关键词
Phosphorus-iridium; Oxygen evolution reaction; Water splitting; Stability; Hydrogen generation
资金
- National Natural Science Foundation of China (NSFC) [21473067, 21601059]
- Natural Science Foundation of Shandong Province, China [ZR2016EMM10]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [KYCX18_2601]
- Key Project funded by HaiYan Program of Lianyungang [2017-ZD-004]
- Graduate Research Innovation Program of Huaihai Institute of Technology [5508201601]
We here demonstrate a high efficient phosphorus-iridium (P-Ir) electrocatalyst for oxygen evolution reaction (OER). The P-Ir particles show an atomic ratio of 2:1 (P:Ir) and a highly uniform size of 1.8-3.6 nm (>90%). Compared to the Ir nanoparticles, the present P-Ir catalyst displays higher catalytic activities in acidic, alkaline, and neutral solutions. The P-Ir catalyst only requires an onset-potential of 190 mV for oxygen evolution in the solution of 0.1M HClO4. Compared with Ir catalyst, the P-Ir reduces the overpotential similar to 30 mV to achieve the oxygen-evolution current densities of 10 and 30 mA cm(-2), respectively. Additionally, at an overpotential of 266 mV, P-Ir obtains a mass activity 1.7 times higher than Ir. Importantly, the P-Ir catalyst shows ultrahigh stability in acidic condition. The enhancement in electrocatalysis should be ascribed to the phosphorus introduction. The work demonstrates that the present P-Ir nanocrystals are promising catalysts in electrochemical splitting water in a broad pH range.
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