Atomically dispersed quintuple nitrogen and oxygen co-coordinated zirconium on graphene-type substrate for highly efficient oxygen reduction reaction

Cell Reports Physical Science

John S. Tse¹  Carlos Fernandez²  Guodong Zou³  Qiuming Peng³  Xue Zhao³  Meng Yang³  Jing Wang³  Jinming Wang³  Chenglin Yan⁴ 

[1] Department of Physics, University of Saskatchewan, Saskatoon, SK S7N5B2, Canada;School of Pharmacy and Life Sciences, Robert Gordon University, AB107GJ Aberdeen, UK;State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P.R. China;Suzhou Key Laboratory of Advanced Carbon Materials and Wearable Energy Technology, Soochow University, Suzhou 215006, P.R. China;

关键词: single atomic Zr;    quintuple coordination;    electrochemical catalyst;    DFT calculations;    oxygen reduction reaction;    Zn-air battery;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: A cost-effective and long stability catalyst with decent electrochemical activity would play a crucial role in accelerating applications of metal-air batteries. Here, we report quintuple nitrogen and oxygen co-coordinated Zr sites on graphene (Zr-N/O-C) by using a ball-milling, solid-solution-assisted pyrolysis method. The as-prepared Zr-N/O-C catalyst with 2.93 wt % Zr shows a half-wave potential of 0.910 V, an onset potential of 1.000 V in 0.1 M KOH, impressive durability (95.1% remains after 16,000 s), and long-term stability (5 mV loss over 10,000 cycles). Zn-air batteries with the Zr-N/O-C electrode exhibit a maximum power density of 217.9 mW cm−2 and a high cycling life of over 1,000 h, exceeding the counterpart equipped with a Pt/C benchmark. Theoretical simulations demonstrate that nitrogen and oxygen dual-ligand confinement effectively tunes the d-band center and balances key intermediates binding energy of intrinsic quintuple coordination Zr sites.

【 授权许可】

Unknown