稳定高效的SiC基半导体可见光催化全解水制氢研究

项目名称： 稳定高效的SiC基半导体可见光催化全解水制氢研究

项目编号： No.51472029

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 袁文霞

作者单位： 北京科技大学

项目金额： 83万元

中文摘要： 化合物半导体是一类重要的太阳能分解水制氢催化剂材料，然而转化效率高且得到实际应用的催化剂体系还需大力研发。禁带宽度可调、应用广泛的SiC具有化学性质稳定、高电子迁移率、价格低廉、环境友好等特性，是一种理想的可见光响应催化剂。本项目在前期SiC可见光催化分解水制氢的基础上，拟以提高SiC可见光全分解水催化活性为研究目标，构建SiC为核心产氢催化剂的Z型光催化体系，系统研究该类催化体系光催化全解水微观机制。通过SiC的p型或n型浅能级掺杂，研究半导体多子类型及其浓度对光生载流子传导分离的影响；对不同晶型SiC进行深能级掺杂，研究掺杂对SiC扩展半导体可见光响应范围的促进机制；引入高导电性固体媒介，研究溶液pH值、媒介/（助）催化剂界面性质、载流子传导等与催化效率的关系，力争开发出性能优良的新型光催化全分解水体系，挖掘SiC在光催化研究领域应用潜力，搞清楚限制半导体全分解水制氢效率的影响因素。

中文关键词： 化合物半导体；光催化材料

英文摘要： Compound semiconductors are a major class of materials acting as photocatalysts for conversion of solar energy into hydrogen by splitting water. However, the photocatalysts with high solar-energy conversion efficiency that can be used practically for water splitting still need to be further explored. Silicon carbide, a well-known semiconductor with tunning band gaps, is finding more and more applications in the recent years. It should be an ideal visible-light-driven photocatalyst in terms of appropriate band gap and CB position, high charge-carrier mobility, chemical stability, low cost and environmental friendliness. In this proposal, we will focus on studing Z scheme photocatalytic mechanism in order to enhance SiC photocatalytic activity by overall splitting water under visible-light irradiation. The influence of majority carriers in P-type or N-type SiC will be determined to understand the separation and migration of photo-excited carriers in a Z-scheme photocatalyst system. It is necessary to extend the response range of visible-light (e.g. from 420 to 600 nm) by deep-level doping of SiC with the different crystal structures. The solid photocatalyst interface is also needed to be studied when introducing a solid electron mediator. The research will facilitate the new enhanced photocatalysts and understand the limit factors for overall water splitting under visible-light illumination.

英文关键词： compound semiconductor;photocatalytic material