γ-MnO2 nanorod-assembled hierarchical micro-spheres with oxygen vacancies to enhance electrocatalyti

• 作 者: Ge Huo Xue-Wan Wang Zhi-Bin Zhang Zhongxin Song Xiao-Min Kang Ming-Xing Chen Qi Wang Xian-Zhu Fu Jing-Li Luo
• 机 构: College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China;Key
• 出 处: 能源化学
• 发表日期: 2020年12期
• 关键词: γ-MnO2 Oxygen vacancy ORR electrocatalysts Al-air battery

γ-MnO2 nanorod-assembled hierarchical micro-spheres with abundant oxygen defects are synthesized by a simple thermal treatment approach as oxygen reduction electrocatalysts for Al(aluminum)-air batteries.The rich oxygen vacancies on the surface of γ-MnO2 are verified by morphology,structure,electron paramagnetic resonance(EPR)and X-ray photoelectron spectroscopy(XPS)results.The oxygen reduction reaction(ORR)electrocatalytic activity of γ-MnO2 is significantly improved by the incoming oxygen vacancies.The γ-MnO2 nanorod-assembled hierarchical micro-spheres calcined under 300 ℃ in Ar atmosphere show the best ORR performance.The primary Al-air batteries using γ-MnO2 catalysts as the cathode,which demonstrates excellent peal power density of 318 mW cm-2 when applying theγ-MnO2 catalysts with optimal amount of oxygen vacancies.