MOF-derived Co-MOF,O-doped carbon as trifunctional electrocatalysts to enable highly efficient Zn-ai

• 作 者: Xinde Duan Na Pan Can Sun Kexin Zhang Xukun Zhu Mingdao Zhang Li Song Hegen Zheng
• 机 构: School of Environmental Science and Engineering, Nanjing University of Information Science & Technol
• 出 处: 能源化学
• 发表日期: 2021年5期
• 关键词: Metal-organic frameworks Carbon catalysts Trifunctional electrocatalyst Metal-ai

Development of high-efficiency non-noble electrocatalysts for oxygen reduction reaction (ORR),oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is urgently needed for high-performance Zn-air batteries and overall water splitting.Here,a facile strategy to synthesize novel Co-MOF,O-doped carbon (Co-MOF-T) based on Zn,Co-doped glucosamine and ZIF-8 by pyrolysis at temperature T was demonstrated.The prepared Co-MOF-800 showed a superior oxygen reduction reaction (ORR) activity comparable to that of commercial Pt/C catalyst.In addition,this catalyst shows great potential in the overall water splitting due to the excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activities.Based on the trifunctional activity,the primary Zn-air batteries using a Co-MOF-800 air electrode achieved a high open-circuit voltage of 1.38 V,a specific capacity of 671.6 mAh gZn-1,and a prominent peak power density of 144 mW cm-2.Also,the rechargeable Zn-air batteries based on CoMOF-800 air electrode could be smoothly run for 510 cycles with a low voltage gap of 0.58 V.Finally,the trifunctional Co-MOF-800 catalyst was applied to boost the electrochemical water splitting,demonstrating its promising potential as a green energy material for practical applications.