Trimetallic ZIFs-derived porous carbon as bifunctional electrocatalyst for rechargeable Zn-air battery
Trimetallic ZIFs-derived porous carbon as bifunctional electrocatalyst for rechargeable Zn-air battery
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DOI：
10.1016/j.jpowsour.2022.231723
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发表时间：
2022-09-15
影响因子：
9.2
通讯作者：
Li, Wei
中科院分区：
文献类型：
--
作者：
Guo, Zanwu;Ma, Yanan;Li, Wei
设计：高性能和卓越稳定性的非贵金属双功能电催化剂是可充电ZAB最关键的问题。在此，开发了一种简单方便的方法来合成三金属Fe/Co/Zn-ZIF衍生的多孔碳作为氧还原反应（ORR）和析氧反应（OER）的双功能电催化剂。最佳的三金属ZIF衍生碳材料表现出显着的ORR催化活性，其更正的起始电位（Eo）为1.010 V，半波电位（E1/2）为0.853 V，优于商业Pt/C催化剂。此外，它还表现出优异的OER性能，在1 M KOH中10 mA cm-2下的过电势比RuO2低352 mV，观察到的塔菲尔斜率为82 mV dec(-1)。用所制备的ZIF衍生多孔碳作为空气阴极组装的可充电ZAB表现出优异的性能，最大电流密度为240.7 mA cm-2，峰值功率密度为156.7 mW cm-2，比容量为769.13 mAh g-1，远大于配备Pt/C-RuO2的ZAB。
Design: of the non-precious-metal bifunctional electrocatalyst with high performance and remarkable stability is the most critical issue for the rechargeable ZAB. Herein, a simple and convenient method for synthesizing trimetallic Fe/Co/Zn-ZIF-derived porous carbon as the bifunctional electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) has been developed. The optimal trimetallic ZIF-derived carbon material shows a marked ORR catalytic activity with a more positive onset potential (Eo) of 1.010 V and half-wave potential (E1/2) of 0.853 V, which is superior to the commercial Pt/C catalyst. Moreover, it also exhibits the excellent OER performance with lower overpotential of 352 mV at 10 mA cm-2 in 1 M KOH than that of RuO2 and the observed Tafel slope of 82 mV dec(-1). A rechargeable ZAB assembled with the as-prepared ZIFderived porous carbon as an air cathode displays the superior performance with a maximum current density of 240.7 mA cm-2 and a peak power density of 156.7 mW cm-2 as well as a specific capacity of 769.13 mAh g-1, much larger than those of ZAB equipped with Pt/C-RuO2.