ZIF-8衍生双金属电催化剂Fe/Co-N-C产过氧化氢及降解氧氟沙星

Hydrogen peroxide production and ofloxacin degradation performance of ZIF-8-derived bimetallic Fe/Co-N-C electrocatalyst

通过双金属掺杂制备不同煅烧温度下的Fe/Co-N-C-x电催化剂。利用X射线衍射仪、拉曼光谱仪对样品的化学结构进行表征,利用电化学工作站、旋转环盘电极考察催化剂的电化学活性。以氧氟沙星为目标污染物,通过降解率评价催化剂降解性能。在碱性条件下催化剂Fe/Co-N-C-800表现出最好的氧化还原性能。金属Co提高了催化剂的过氧化氢选择性及积累浓度,其过氧化氢选择性可达75%,过氧化氢积累浓度最高为142 mmol/L,经200次循环后仍表现出良好的稳定性。

Fe/Co-N-C-x electrocatalysts at different calcination temperatures were prepared by bimetallic doping.The crystal structure of the sample was characterized by XRD and Raman,and the electrochemical activity of catalysts was investigated using electrochemical workstation and rotating ring disc electrode.The catalytic degradation performance of catalyst was evaluated by degradation rate using ofloxacin as target pollutant.The Fe/Co-N-C-800 catalyst exhibited the best redox performance under alkaline conditions.Cobalt improved the H_(2)O_(2)selectivity and accumulation concentration of the catalyst.The selectivity of H_(2)O_(2)produced electrically can reach 75%,and the highest concentration of H_(2)O_(2)accumulation is 142 mmol/L.It showed good stability after 200 cycles.