材料科学
催化作用
钴
电催化剂
碳化
介孔材料
碳纳米管
化学工程
电池(电)
碳纤维
纳米技术
化学
电极
电化学
复合材料
物理化学
有机化学
复合数
工程类
物理
功率(物理)
冶金
量子力学
扫描电子显微镜
作者
Chongchao Yao,Jiaxin Li,Zhihao Zhang,Chunli Gou,Zhongshen Zhang,Gang Pan,Jing Zhang
出处
期刊:Small
[Wiley]
日期:2022-04-18
卷期号:18 (20)
被引量:48
标识
DOI:10.1002/smll.202108094
摘要
Projecting a cost-effective and highly efficient electrocatalyst for the oxygen reaction reduction (ORR) counts a great deal for Zn-air batteries. Herein, a hierarchical core-shell ORR catalyst (Co2 N/CoP@PNCNTs) is developed by embedding cobalt phosphides and/or cobalt nitrides as the core into N, P-doped carbon nanotubes (PNCNTs) as the shell via one-step carbonization, nitridation, and phosphorization of pyrolyzing Co-MOF precursor. The globally N, P-doped structure of Co2 N/CoP@PNCNTs demonstrates an outstanding electrocatalytic activity in the alkaline solution with the onset and half-wave potentials of 1.07 and 0.85 V respectively. Moreover, a Zn-air battery assembled from Co2 N/CoP@PNCNTs as the air cathode delivers an open circuit potential of 1.49 V, a maximum power density of 151.1 mW cm-2 and a specific capacity of 823.8 mAh kg-1 . It is reflected that Co2 N/CoP@PNCNTs provides a long-term durability with a slight decline of 15 h in the chronoamperometry measurement and an excellent charge-discharge stability with negligible voltage decay for 150 h at 10 mA cm-2 in Zn-air batteries. The results reveal that Co2 N/CoP@PNCNTs has superiority over most Co-Nx -C or Cox P@C catalysts reported so far. The excellent catalytic properties and stability of Co2 N/CoP@PNCNTs derive from synergistic effects between Co2 N/CoP and mesoporous N, P-doped carbon nanotubes.
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