期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 25, 期 55, 页码 12780-12788出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201902389
关键词
CuCo alloy nanoparticles; metal-organic frameworks; nitrogen-doped carbon; oxygen electrocatalysts; zinc-air batteries
资金
- Thousand Talents Program of China
- National Natural Science Foundation of China [21601118, 21101170, 21573139, 21773146]
- Fundamental Research Funds for the Central Universities [GK201903033]
- Research Funds of Shaanxi Normal University
The development of efficient bifunctional electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) still remains a challenge in a wide range of renewable energy technologies. Herein, CuCo alloy nanoparticles encapsulated by nitrogen-doped carbonaceous nanoleaves (CuCo-NC) have been synthesized from a Cu(OH)(2)/2D leaf-like zeolitic imidazolate framework (ZIF-L)-pyrolysis approach. Leaf-like Cu(OH)(2) is first prepared by the ultrasound-induced self-assembly of Cu(OH)(2) nanowires. The efficient encapsulation of Cu(OH)(2) in ZIF-L is obtained owing to the morphology fitting between the leaf-like Cu(OH)(2) and ZIF-L. CuCo-NC catalysts present superior electrocatalytic activity and stability toward ORR and OER over the commercial Pt/C and IrO2, respectively, which are further used as bifunctional oxygen electrocatalysts in Zn-air batteries and exhibit impressive performance, with a high peak power density of 303.7 mW cm(-2), large specific capacity of up to 751.4 mAh g(-1) at 20 mA cm(-2), and a superior recharge stability.
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