Potassium ions and cyano group modified g-C_(3)N_(4) for effective generation of H_(2)O_(2) through two-electron oxygen reduction  

作　　者：Dongying Wang Shulan Pu Yongmin Chen Ke Lei Yujie Duan Linjiao Mao Xuhui Zeng Xi Luo Yuntao Zhang Yuqin Dong Jin Zhong Zhang Yan Sun 

机构地区：[1]School of Mechanical Engineering,Chengdu University,Chengdu 610106,China [2]Department of Chemistry and Biochemistry,University of California,Santa Cruz,CA 95064,USA

出　　处：《Science China Chemistry》2025年第1期192-200,共9页中国科学(化学英文版)

基　　金：supported by the National Natural Science Foundation of China(51702027)。

摘　　要：Potassium ions(K^(+))doped graphitic carbon nitride(g-C_(3)N_(4))was prepared by a thermal etching method using potassium hydroxide(KOH)as an ion source.Fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS)results showed that the generation of the cyano group was detected while introducing K^(+).Under simulated sunlight irradiation,the sample with a K^(+)doping amount of 10%showed the highest hydrogen peroxide(H_(2)O_(2))generation rate of2,140.2μmol h^(-1)g^(-1).The apparent quantum yield(AQY)at 400 nm and the solar-to-chemical conversion(SCC)are 4.35%and1.23%,respectively.K^(+)acted as a bridge between g-C_(3)N_(4)layers,which enhanced charge transfer efficiency.Meanwhile,the cyano group enhanced the adsorption capacity of protons(H^(+))and promoted the yield of H_(2)O_(2).The catalyst exhibited excellent photocatalytic stability based on four-cycle experiments.In addition,a mechanism study showed that superoxide radicals(·O_(2)^(-))were the most important active species in the reaction system.Photocatalytic production of H_(2)O_(2)was achieved through consecutive single-electron steps.This study deepens the understanding of the oxygen reduction reaction process and opens up a new venue for improving H_(2)O_(2)generation.

关 键 词：PHOTOCATALYSIS hydrogen peroxide oxygen reduction reaction potassium doping cyano group 

分 类 号：O62[理学—有机化学]