物理化学学报2023，Vol.39Issue(6)：112-121,10.DOI:10.3866/PKU.WHXB202212009
S-型MnCo2S4/g-C3N4异质结光催化产氢性能研究
S-Scheme MnCo2S4/g-C3N4 Heterojunction Photocatalyst for H2 Production
摘要
Abstract
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 non-renewable 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 H2 reacting with O2 to generate H2O.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(2H2O → 2H2+O2)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 H2 production from water is considered a promising approach to obtain H2 energy due to its environmentally friendly energy conversion.However,the effectiveness of acquiring H2 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 H2 energy.Thus,developing highly efficient photocatalysts for H2 production is critical in promoting this technology moving forward,and obtaining renewable energy.Herein,we successfully construct the S-scheme MnCo2S4/g-C3N4 heterojunction through an expedient physical mixing process at a low temperature,which can be separately obtained via the pyrolysis process and hydrothermal method.The H2 production rate of MnCo2S4/g-C3N4 heterojunction can achieve up to 2979 μmol·g-1·h-1,which is 26.4 and 8.7 times higher than those of g-C3N4(113 μmol·g-1·h-1)and MnCo2S4(341 μmol·g-1·h-1),respectively,and presents a superior stability in three continuous cycles during H2 production tests.The high H2 production of MnCo2S4/g-C3N4 heterojunction is mainly ascribed to the following three reasons:ⅰ)The light absorption region of the heterojunction is extended to visible light.ⅱ)MnCo2S4/g-C3N4 possesses low impedance during the reaction,high photocurrent density,and more exposed sites in solution.ⅲ)The efficient reservation of active electron-hole pairs greatly enhances the ratio of electrons reacting with H*species to generate H2 over MnCo2S4/g-C3N4 heterojunction.This work provides an efficient approach to constructing advanced g-C3N4-based photocatalysts through hybridization with metal sulfides to form S-scheme heterojunctions.关键词
MnCo2S4/g-C3N4/S-型异质结/光催化分解水Key words
MnCo2S4/Carbon nitride/S-scheme heterojunction/Photocatalytic H2 production from water splitting分类
化学引用本文复制引用
孙涛,李晨曦,鲍钰鹏,樊君,刘恩周..S-型MnCo2S4/g-C3N4异质结光催化产氢性能研究[J].物理化学学报,2023,39(6):112-121,10.基金项目
This work was supported by the National Natural Science Foundation of China(11974276,22078261),Natural Science Basic Research Program of Shaanxi Province,China(2020JM-422),Key Science and Technology Innovation Team of Shaanxi Province,China(2022TD-33),National Innovation and Entrepreneurship Training Program for College Students,China(202210697148,202210697069),Qin Chuangyuan Project of Shaanxi Province,China(QCYRCXM-2022-213).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 （11974276,22078261）
