双功能
合金
材料科学
催化作用
化学工程
碳纤维
析氧
电化学
纳米颗粒
热解
氧气
纳米技术
电极
化学
冶金
复合材料
复合数
有机化学
物理化学
工程类
作者
Shi Fang,Kaiyue Zhu,Xiaoke Li,Erdong Wang,Xuefeng Zhu,Weishen Yang
标识
DOI:10.1016/j.jechem.2021.01.032
摘要
Developing high active and stable bifunctional electrocatalysts towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential for the development of rechargeable Zn-air batteries. Herein, a facile strategy to synthesize the porous carbon layers wrapped CoFe alloy (C/CoFe) through the pyrolysis of a homogeneous mixture containing Co, Fe ions and N-doped carbon quantum dots (N-doped CQDs) was reported. The prepared carbon layers with multi-level pore structures provides more active sites and optimizes the homogeneity of the electron and mass transport. In addition, the carbon layers, which is doped by Co/Fe/N atoms, is responsible for high ORR activity, while the CoFe alloy plays a vital role in OER performance. The as-synthesized catalyst exhibits an excellent bifunctionality for electrochemical oxygen reactions, which is comparable to the commercial Pt/C and IrO2 benchmarks. Owing to the carbon layers protects CoFe alloy nanoparticles from the harsh environment, the rechargeable Zn–air battery with the C/CoFe catalyst delivers excellent stability during 20,000 charging-discharging cycles.
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