物理化学学报2021，Vol.37Issue(6)：45-75,31.DOI:10.3866/PKU.WHXB202010017
用于光催化能量转换的Z-型异质结的研究进展
Review of Z-Scheme Heterojunctions for Photocatalytic Energy Conversion
摘要
Abstract
Inspired by the photosynthesis of green plants,various artificial photosynthetic systems have been proposed to solve the energy shortage and environmental problems.Water photosplitting,carbon dioxide photoreduction,and nitrogen photofixation are the main systems that are used to produce solar fuels such as hydrogen,methane,or ammonia.Although conducting artificial photosynthesis using man-made semiconducting materials is an ideal and potential approach to obtain solar energy,constructing an efficient photosynthetic system capable of producing solar fuels at a scale and cost that can compete with fossil fuels remains challenging.Therefore,exploiting the efficient and low-cost photocatalysts is crucial for boosting the three main photocatalytic processes (light-harvesting,surface/interface catalytic reactions,and charge generation and separation) of artificial photosynthetic systems.Among the various photocatalysts developed,the Z-scheme heterojunction composite system can increase the light-harvesting ability and remarkably suppress charge carrier recombination;it can also promote surface/interface catalytic reactions by preserving the strong reductive/oxidative capacity of the photoexcited electrons/holes,and therefore,it has attracted considerable attention.The continuing progress of Z-scheme nanostructured heterojunctions,which convert solar energy into chemical energy through photocatalytic processes,has witnessed the importance of these heterojunctions in further improving the overall efficiency of photocatalytic reaction systems for producing solar fuels.This review summarizes the progress of Z-scheme heterojunctions as photocatalysts and the advantages of using the direct Z-scheme heterojunctions over the traditional type Ⅱ,all-solid-state Z-schemel,and liquid-phase Z-scheme ones.The basic principle and corresponding mechanism of the two-step excitation are illustrated.In particular,applications of various types of Z-scheme nanostructured materials(inorganic,organic,and inorganic-organic hybrid materials) in photocatalytic energy conversion and different controlling/engineering strategies (such as extending the spectral absorption region,promoting charge transfer/separation and surface chemical modification) for enhancing the photocatalytic efficiency in the last five years are highlighted.Additionally,characterization methods (such as sacrificial reagent experiment,metal loading,radical trapping testing,in situ X-ray photoelectron spectroscopy,photocatalytic reduction experiments,Kelvin probe force microscopy,surface photovoltage spectroscopy,transient absorption spectroscopy,and theoretical calculation) of the Z-scheme photocatalytic mechanism,and the assessment criteria and methods of the photocatalytic performance are discussed.Finally,the challenges associated with Z-scheme heterojunctions and the possible growing trend are presented.We believe that this review will provide a new understanding of the breakthrough direction of photocatalytic performance and provide guidance for designing and constructing novel Z-scheme photocatalysts.关键词
半导体/光催化/Z-型异质结/能源转化/反应机理Key words
Semiconductor/Photocatalysis/Z-scheme heterojunction/Energy conversion/Reaction mechanism分类
化学化工引用本文复制引用
刘东,陈圣韬,李仁杰,彭天右..用于光催化能量转换的Z-型异质结的研究进展[J].物理化学学报,2021,37(6):45-75,31.基金项目
This work is supported by the Natural Science Foundation of China (21975190,21871215,21631003,21573166),the Science & Technology Planning Project of Shenzhen Municipality,China (JCYJ20180302153921190),Natural Science Foundation of Jiangsu Province,China (BK20151247),and the Funds for Creative Research Groups of Hubei Province,China (2014CFA007)国家自然科学基金(21975190,21871215,21631003,21573166)、深圳市科技创新委员会科技项目(JCYJ20180302153921190)、江苏省自然科学基金(BK20151247)、湖北省创新群体(2014CFA007)资助项目 （21975190,21871215,21631003,21573166）
