期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 8, 期 13, 页码 6245-6255出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00445f
关键词
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资金
- National Natural Science Foundation of China [51871133, 51671115]
- Taishan Scholar Foundation of Shandong Province, Department of Science and Technology of Shandong Province
- Program of Jinan Science and Technology Bureau, China
Developing efficient and less noble-metal-dependent electrocatalysts toward both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is one of the key challenges for polymer electrolyte membrane (PEM) electrolyzer applications. Herein, we report the preparation of bifunctional NiIrRuAl multimetallic nanoporous nanowires (NPNWs) with different compositions through the combination of metallurgical control and a two-step dealloying method. The synthesized NiIrRuAl NPNWs display ultrahigh OER and HER activities in acid solution. With a significantly reduced noble metal (Ir and Ru) content as low as 34 at%, the NiIrRuAl-1/3 electrocatalyst (Ir : Ru = 1 : 3) yields the best OER performance, showing an extremely low overpotential of 237 mV at 10 mA cm(-2), and the overpotential of the NiIrRuAl-3/1 electrocatalyst (Ir : Ru = 3 : 1) in the HER is only 14 mV at 10 mA cm(-2) in 0.1 M HClO4 solution. More significantly, the NiIrRuAl NPNWs only need a cell voltage of 1.464 V to reach 10 mA cm(-2) for overall water splitting and show excellent long-term stability.
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