阮艳莉,王天宇,顾祥顺

• 1:天津工业大学环境科学与工程学院

摘要(Abstract)：

为了解决锰氧化物氧电极催化剂导电性差的问题，并进一步提高其催化活性，引入沸石咪唑酯骨架结构（ZIF8）材料与二氧化锰（MnO_2）材料复合，经高温煅烧后，制得具有高稳定性和双功能催化活性的MnO@N-C催化剂。采用SEM、XRD、XPS对MnO@N-C催化剂进行表征，并将其用于锌空气电池，考察该催化剂的催化性能和电池性能。结果表明：ZIF8的加入为材料提供了丰富的氮（N）源和碳（C）源，增加了催化活性位点，提高了催化剂的导电性和活性，同时，通过2种材料之间的协同作用，使MnO@N-C催化剂实现了较高的双功能性能；催化剂在碱性电解液中的氧还原（ORR）半波电位为0.78 V，与Pt/C催化剂（0.81 V）相接近，同时MnO@N-C催化剂还具有较低的Tafel斜率（113.74 mV/dec）；在10 mA/cm~2下催化剂的氧析出（OER）电位E_(j=10)为1.66 V，与贵金属催化剂Ir O_2(1.66 V）相当；使用MnO@N-C催化剂组装的锌空气电池峰值功率密度达到121 mW/cm~2，在10 mA/cm~2下可稳定循环80 h，显示MnO@N-C催化剂具有优异的电化学循环稳定性，是一种非常有前途的高性能锌空气电池氧电极双功能催化剂。

关键词(KeyWords)： 锌空气电池;双功能氧电极催化剂;ZIF8;氧化锰;氧还原(ORR);氧析出(OER);电化学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目（21403153）

作者(Author): 阮艳莉,王天宇,顾祥顺

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