Iron Carbide Nanoparticles Encapsulated in Mesoporous Fe鈥揘-Doped Graphene-Like Carbon Hybrids as Efficient Bifunctional Oxygen Electrocatalysts

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• 作者：Hongliang Jiang ; Yifan Yao ; Yihua Zhu ; Yanyan Liu ; Yunhe Su ; Xiaoling Yang ; Chunzhong Li
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 30, 2015
• 年：2015
• 卷：7
• 期：38
• 页码：21511-21520
• 全文大小：559K
• ISSN：1944-8252

文摘

It is highly crucial and challenging to develop bifunctional oxygen electrocatalysts for oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs) in rechargeable metal-air batteries and unitized regenerative fuel cells (URFCs). Herein, a facile and cost-effective strategy is developed to prepare mesoporous Fe鈥揘-doped graphene-like carbon architectures with uniform Fe₃C nanoparticles encapsulated in graphitic layers (Fe₃C@NG) via a one-step solid-state thermal reaction. The optimized Fe₃C@NG800-0.2 catalyst shows comparable ORR activity with the state-of-the-art Pt/C catalyst and OER activity with the benchmarking RuO₂ catalyst. The oxygen electrode activity parameter 螖E (the criteria for judging the overall catalytic activity of bifunctional electrocatalysts) value for Fe₃C@NG800-0.2 is 0.780 V, which surpasses those of Pt/C and RuO₂ catalysts as well as those of most nonprecious metal catalysts. Significantly, excellent long-term catalytic durability holds great promise in fields of rechargeable metal-air batteries and URFCs.