不同碳化温度对ZIF-8碳化物催化活性的影响

摘要

This paper uses Zn(NO3)2·6H2O and 2-methyl imidazole at room temperature to prepare a kind of ideal precursor ZIF-8. The effects of different temperatures on the surface morphology and catalytic properties of carbides are investigated at different temperatures. By the means ofTEM and EDS characterizations, the crystal morphology and distribution of carbon, nitrogen elements is studied. Furthermore, we applied the instrument of cyclic voltammetry (CV), linear scan test method (LSV), and K-L equation, to explore the peak potential under different temperatures, ZIF-8-T half wave potential, and limiting current density. Through characterization and test, it is found that of ZIF-8 at temperature of 800℃carbidespossesses conductive carbon frameworks with larger pore volume, resulting in advanced ORR catalytic activity.%本文采用六水硝酸锌和2-甲基咪唑常温下混合搅拌制备一种理想的前躯体ZIF-8.在不同温度T下进行碳化,探究不同温度对碳化物的表面形貌和催化性能的影响.本文通过TEM、EDS等表征手段,观察了ZIF-8晶体碳化后形貌以及碳氮元素的分布,进一步通过循环伏安法(CV) 线性扫描测试法(LSV) 以及K-L方程,探究了不同温度下ZIF-8-T的峰电位、半波电位和极限电流密度.通过表征和测试发现,当碳化温度为800℃,碳化物具有较大的孔体积和导电性碳框架,具有较优的ORR催化活性.