麦芽糖衍生氧自掺杂电催化剂电合成H_(2)O_(2)性能

Performance of Electrosynthesis of H_(2)O_(2)by Maltose-derived Oxygen Self-doped Electrocatalysts

两电子氧还原反应原位电合成H_(2)O_(2)是一种有前景的储能及H_(2)O_(2)制备方法。通过一步碳化法获得麦芽糖衍生的氧自掺杂电催化剂用于电合成H_(2)O_(2),碳化温度会改变催化剂表面官能团种类与缺陷程度从而影响其H_(2)O_(2)选择性。结果表明,在800℃碳化的催化剂具有最优的选择性,利用含氧官能团和缺陷作为反应位点,以微孔为主的孔隙结构能促进反应位点均匀分布和物质传递。负载催化剂的空气自呼吸阴极在100 mA·cm^(-2)的外加电流密度下,H_(2)O_(2)产率为39.88 mg·h^(-1)·cm^(-2),接近工业化可持续生产H_(2)O_(2)的要求。

In situ electrosynthesis of H_(2)O_(2)by two-electron oxygen reduction reaction is a promising method for energy storage and H_(2)O_(2)production.Maltose-derived oxygen self-doping electrocatalysts were obtained by one-step carbonation method for the electrosynthesis of H_(2)O_(2).The carbonization temperature would change the types of surface functional groups and the degree of defects of the catalyst,thus affecting the H_(2)O_(2)selectivity.The results show that the catalyst carbonized at 800°C has the optimal selectivity,using oxygenic functional groups and defects as reaction sites,and the pore structure dominated by micropores can promote uniform distribution of reaction sites and mass transfer.Under the applied current density of 100 mA·cm^(−2),the H_(2)O_(2)yield of the air-breathing cathode loaded with the catalyst achieves 39.88 mg·h^(−1)·cm^(−2),which is close to the requirement of industrial sustainable production of H_(2)O_(2).