Urchin-like CoP Nanocrystals as Hydrogen Evolution Reaction and Oxygen Reduction Reaction Dual-Electrocatalyst with Superior Stability

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• 作者：Hongchao Yang ; Yejun Zhang ; Feng Hu ; Qiangbin Wang
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：15
• 期：11
• 页码：7616-7620
• 全文大小：429K
• ISSN：1530-6992

文摘

High-performance electrocatalysts with superior stability are critically important for their practical applications in hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). Herein, we report a facile method to fabricate urchin-like CoP nanocrystals (NCs) as catalyst for both HER and ORR with desirable electrocatalytic activities and long-term stability. The urchin-like CoP NCs with a diameter of 5 渭m were successfully prepared by a hydrothermal reaction following a phosphidation treatment in N₂ atmosphere and present excellent HER catalytic performance with a low onset overpotential of 50 mV, a small Tafel slope of 46 mV/decade, and an exceptional low overpotential of 鈭?80 mV at a current density of 100 mA cm^鈥? with a mass loading density of 0.28 mg/cm². Meanwhile, a remarkable ORR catalytic activity was observed with a half-potential of 0.7 V and an onset potential of 0.8 V at 1600 rpm and a scan rate of 5 mV s^鈥?. More importantly, the urchin-like CoP NCs present superior stability and keep their catalytic activity for at least 10鈥?00 CV cycles for HER in 0.5 M H₂SO₄ and over 30鈥?00 s for ORR in 0.1 M KOH, which is ascribed to their robust three-dimensional structure. This urchin-like CoP NCs might be a promising replacement to the Pt-based electrocatalysts in water splitting and fuel cells.