电催化剂
尖晶石
催化作用
化学工程
材料科学
氧化物
纳米颗粒
析氧
碳纳米管
电化学
氧气
无机化学
阴极
甲醇
氧化还原
化学
电极
纳米技术
物理化学
有机化学
冶金
工程类
作者
Xiaotong Wang,Ting Ouyang,Ling Wang,Jia‐Huan Zhong,Zhao‐Qing Liu
标识
DOI:10.1002/anie.202000690
摘要
Herein, we highlight redox-inert Zn2+ in spinel-type oxide (ZnX Ni1-X Co2 O4 ) to synergistically optimize physical pore structure and increase the formation of active species on the catalyst surface. The presence of Zn2+ segregation has been identified experimentally and theoretically under oxygen-evolving condition, the newly formed VZn -O-Co allows more suitable binding interaction between the active center Co and the oxygenated species, resulting in superior ORR performance. Moreover, a liquid flow Zn-air battery is constituted employing the structurally optimized Zn0.4 Ni0.6 Co2 O4 nanoparticles supported on N-doped carbon nanotube (ZNCO/NCNTs) as an efficient air cathode, which presents remarkable power density (109.1 mW cm-2 ), high open circuit potential (1.48 V vs. Zn), excellent durability, and high-rate performance. This finding could elucidate the experimentally observed enhancement in the ORR activity of ZnX Ni1-X Co2 O4 oxides after the OER test.
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