Design of N-Coordinated Dual-Metal Sites: A Stable and Active Pt-Free Catalyst for Acidic Oxygen Reduction Reaction

作者：Jing Wang, Zheng‐Qing Huang, Wei Liu, Chun‐Ran Chang, Haolin Tang, Zhijun Li, Wenxing Chen, Chun‐Jiang Jia, Tao Yao, Shiqiang Wei, Yuen Wu, Yadong Li · 发表于：Journal of the American Chemical Society · 年份：2017 · DOI：10.1021/jacs.7b10385 · 被引用次数：1598 · 研究领域：Electrocatalysts for Energy Conversion、Fuel Cells and Related Materials、Advanced battery technologies research

We develop a host-guest strategy to construct an electrocatalyst with Fe-Co dual sites embedded on N-doped porous carbon and demonstrate its activity for oxygen reduction reaction in acidic electrolyte. Our catalyst exhibits superior oxygen reduction reaction performance, with comparable onset potential ( E onset, 1.06 vs 1.03 V) and half-wave potential ( E 1/2, 0.863 vs 0.858 V) than commercial Pt/C. The fuel cell test reveals (Fe,Co)/N-C outperforms most reported Pt-free catalysts in H 2 /O 2 and H 2 /air. In addition, this cathode catalyst with dual metal sites is stable in a long-term operation with 50 000 cycles for electrode measurement and 100 h for H 2 /air single cell operation. Density functional theory calculations reveal the dual sites is favored for activation of O-O, crucial for four-electron oxygen reduction.