S-型MnCo_(2)S_(4)/g-C_(3)N_(4)异质结光催化产氢性能研究  

S-Scheme MnCo_(2)S_(4)/g-C_(3)N_(4) Heterojunction Photocatalyst for H_(2) Production

作　　者：孙涛[1] 李晨曦 鲍钰鹏 樊君[1] 刘恩周[1] Tao Sun;Chenxi Li;Yupeng Bao;Jun Fan;Enzhou Liu(School of Chemical Engineering,Xi’an Key Laboratory of Special Energy Materials,Northwest University,Xi’an,710069,China)

机构地区：[1]西北大学化工学院/西安特种能源材料重点实验室,西安710069

出　　处：《物理化学学报》2023年第6期112-121,共10页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(11974276,22078261);陕西省自然科学基础研究计划项目(2020JM-422);陕西省重点科技创新团队(2022TD-33);国家大学生创新创业培训计划(202210697148,202210697069);陕西秦创原人才项目(QCYRCXM-2022-213)资助。

摘　　要：本文通过简单的水热法和热解法分别得到MnCo_(2)S_(4)和g-C_(3)N_(4)催化剂,之后采用溶剂蒸发法将MnCo_(2)S_(4)和g-C_(3)N_(4)纳米片结合构建获得无贵金属的S-型MnCo_(2)S_(4)/g-C_(3)N_(4)异质结。研究结果表明,优化后的复合材料具有良好的光催化产氢活性,其产氢速率最高可到2979μmol·g^(-1)·h^(-1),分别为g-C_(3)N_(4)(113μmol·g^(-1)·h^(-1))和MnCo_(2)S_(4)(341μmol·g^(-1)·h^(-1))的26.4和8.7倍。这主要归因于形成的S-型异质结具有比单体更低的反应阻抗,更高的光电流和高效的电子-空穴分离能力,以及低的析氢过电势。本研究为开发稳定、高效的非贵金属产氢异质结催化剂提供了实验基础。The increased global demand for energy and the enhanced deterioration of the environment are the two urgent challenges of the 21st century on the way to sustainable development for human society.Currently,green and renewable energy conversion technology has received much attention as a substitute for limited and nonrenewable fossil fuels.Hydrogen energy is advantageous because of its high energy capacity(142 MJ·kg^(−1))and its production by green conversion technology,consisting of H_(2) reacting with O_(2) to generate H_(2)O.It can establish a clean and sustainable hydrogen economic system,as well as reduce the utilization of fossil fuels and carbon dioxide emissions.Water splitting technology is an efficient approach to acquire the featured H2 energy of the green reaction(2H_(2)O→2H_(2)+O_(2))through electrocatalytic and photocatalytic reactions.Photocatalysis technology,with the advantage of huge solar energy utilization,has been widely regarded as a promising method for the realization of this chemical synthesis.Among photocatalysis technologies,photocatalytic H_(2) production from water is considered a promising approach to obtain H_(2) energy due to its environmentally friendly energy conversion.However,the effectiveness of acquiring H_(2) energy through photocatalytic water splitting is intimately related with photocatalysts.In general,photocatalysts still face the big challenge of their low solar energy utilization efficiency,which restricts the large-scale application of photocatalytic technology to obtain H_(2) energy.Thus,developing highly efficient photocatalysts for H_(2) production is critical in promoting this technology moving forward,and obtaining renewable energy.Herein,we successfully construct the S-scheme MnCo_(2)S_(4)/g-C_(3)N_(4) heterojunction through an expedient physical mixing process at a low temperature,which can be separately obtained via the pyrolysis process and hydrothermal method.The H_(2) production rate of MnCo_(2)S_(4)/g-C_(3)N_(4) heterojunction can achieve up to 2979μm

关 键 词：MnCo_(2)S_(4) g-C_(3)N_(4) S-型异质结 光催化分解水 

分 类 号：O643[理学—物理化学]