题 目：Oxidizing Vacancies in Nitrogen-Doped Carbon Enhance Air-Cathode Activity
作 者：Mengfan Wang1, Weipeng Wang2, Tao Qian1, Sisi Liu1, Yutao Li3, Zhufeng Hou4, John B. Goodenough3, Pulickel M. Ajayan2, Chenglin Yan1
1.Soochow Institute for Energy and Materials InnovationS College of Physics Optoelectronics and Energy Soochow University Suzhou 215006, China
2.Department of Materials Science and Nanoengineering, Rice University, Houston, TX 77005, USA
3.Materials Science and Engineering Program and Department of Mechanical Engineering The University of Texas at Austin, Austin, TX 78705, USA
4. National Institute for Materials Science (NIMS) 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
摘 要：Oxidizing vacancies in nitrogen‐doped carbon have recently been reported to enhance the oxygen reaction activity of air cathodes, but their specific role has remained elusive and controversial. Herein, the critical role of oxidizing the vacancies in enhancing the oxygen reduction reaction for metal–air battery is identified with density functional theory. Deliberate introduction of oxygen‐enriched vacancies in nitrogen-doped carbon is shown experimentally to provide superior oxygen reduction activity. In situ X-ray powder diffraction gives direct observation of the oxygen reactions in a zinc-air battery catalyzed by vacancy-enriched oxidized carbon; the intensity changes of the carbon peak show continuous chemisorption of oxygen intermediates on the carbon cathode during discharge. The air-cathode performance is shown to exceed that with Pt/C+IrO2 catalysts.