双功能
杂原子
电池(电)
电催化剂
材料科学
析氧
催化作用
双金属
碳纤维
介孔材料
化学工程
无机化学
化学
电极
电化学
复合数
有机化学
复合材料
戒指(化学)
物理化学
功率(物理)
工程类
物理
量子力学
作者
Jun Li,Huaibin Xue,Nengneng Xu,Xiucheng Zhang,Yongxia Wang,Rui He,Haitao Huang,Jinli Qiao
标识
DOI:10.1016/j.matre.2022.100090
摘要
Rational construction of highly efficient and cheap bifunctional electrocatalysts to boost both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is extremely essential for the wide application of rechargeable metal-air battery. In this work, we design a core-shell structural catalyst of CoNi dual-metal embedded in nitrogen doped porous carbon (NPC, [email protected]), which is developed via the pyrolysis of CoNi-MOFs, assisting by mesoporous SiO2 to effectively inhibit the aggregation of metal sites. Consequently, the as-prepared [email protected] manifests good ORR activity with half-wave potential up to 0.77 V. Specifically, the [email protected] gives a very low OER over-potential of merely 101 mV in 6 M KOH along with high stability, outperforming the commercial Pt/C-RuO2. Moreover, the home-made zinc air battery with [email protected] air cathode demonstrates excellent stability over long-term charging–discharging test, and delivers the maximum power density of 224 mW cm−2. The enhanced high performance of [email protected] bifunctional catalyst for both ORR and OER can be ascribed to its unique core-shell structure and strong synergistic effect between the dual-bimetal active sites and the heteroatom doped carbon. This work opens a new avenue for the rational design of nonprecious metal bifunctional catalysts for rechargeable metal-air battery.
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