Coupling hollow Fe3O4 nanoparticles with oxygen vacancy on mesoporous carbon as a high-efficiency ORR electrocatalyst for Zn-air battery

作者：Deng, Yijie; Tian, Xinlong; Shen, Guohong; Gao, Yang; Lin, Chenxiao; Ling, Liming; Cheng, Faliang^*; Liao, Shijun; Zhang, Shiguo^*

来源：Journal of Colloid and Interface Science, 2020, 567: 410-418.

DOI：10.1016/j.jcis.2020.02.013

• Fe(3)o(4)
• Oxygen vacancy
• Mesoporous carbon
• Oxygen reduction catalyst
• Zn-air battery

Designing a low-cost, high-efficiency and robust doped-carbon-based oxygen reduction reaction electrocatalyst for large-scale implementations of fuel cells is highly desirable but challenging. In this work, we report a new type of hollow Fe3O4 with oxygen vacancy incorporating on mesoporous carbon prepared by pyrolyzing mesoporous carbon enriched with oxygen-containing functional groups, in combination with ferric acetylacetonate. The catalysts possess high specific surface area with predominantly mesoporous architecture and ultrahigh nitrogen content (up to 7.47 wt%). Benefiting from the integration of abundant active nitrogen and Fe-N-x species, and synergistic effect between Fe3O4 nanoparticles cooperated with oxygen vacancy and N-doped carbon, the half-wave potential of the preparing hybrid catalyst is 30 mV more positive than that of the commercial Pt/C catalyst in alkaline medium, and exhibits a high selectivity (4 e(-) process), and outstanding long-term stability. More importantly, the C-FePPDA-900 catalyst displays a high power density (106 mW cm(-2)) and specific capacity of 724 mAh g(zn)(-1); when it is used as an air cathode catalyst in a specifically assembling Zn-air cell, superior to those of most reported catalysts.

• 单位
  西安交通大学; 东莞理工学院; 海南大学