双功能
电催化剂
碳纤维
析氧
材料科学
催化作用
金属有机骨架
杂原子
电池(电)
热解
双功能催化剂
化学工程
无机化学
化学
电化学
电极
有机化学
复合数
吸附
物理
功率(物理)
复合材料
物理化学
量子力学
戒指(化学)
工程类
作者
Yuhong Qian,Zhigang Hu,Xiaoming Ge,Shi-Jie Yang,Yongwu Peng,Zixi Kang,Zhaolin Liu,Jim Yang Lee,Dan Zhao
出处
期刊:Carbon
[Elsevier]
日期:2017-01-01
卷期号:111: 641-650
被引量:299
标识
DOI:10.1016/j.carbon.2016.10.046
摘要
Rechargeable Zn-air batteries are under intensive studies because of their high-energy density, low cost, and safety. However, their wide application is prevented by several remaining technical issues, one of which is the lack of suitable bifunctional cathodic catalysts for oxygen reduction reaction (ORR) during discharging and oxygen evolution reaction (OER) during charging. Due to low material cost and wide distribution, carbon-based materials may serve as promising electrocatalysts, while doping heteroatoms such as nitrogen or boron can effectively enhance their catalytic activity. Herein, we pyrolyze a metal-organic framework containing Zn, N, and B as the precursor to synthesize dual-doped and metal-free porous carbon materials as efficient ORR/OER bifunctional electrocatalysts. The surface area of obtained carbon materials can be greatly enhanced by pyrolysis under H2-containing atmosphere. In addition, N and B are evenly distributed within the carbon materials due to the crystalline MOF precursor. The resultant carbon materials exhibit high ORR and OER catalytic activities in both half-cell and single-cell battery measurements. Our study has demonstrated for the first time that MOFs can be used as precursors to synthesize metal-free ORR/OER bifunctional cathodic electrocatalysts with great potential in rechargeable Zn-air batteries.
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