项目名称: 有序介孔壳层/纳米线多级结构的可控合成及其光解水催化与电化学储能
项目编号: No.21473038
项目类型: 面上项目
立项/批准年度: 2015
项目学科: 数理科学和化学
项目作者: 郑耿锋
作者单位: 复旦大学
项目金额: 91万元
中文摘要: 本项目以太阳能的高效转化和存储为目标,针对半导体光电极的结构设计,与光催化反应能量的存储这两个重要的瓶颈问题,拟可控合成具有Z型能级结构、一维纳米线阵列的半导体光阳极与光阴级,并进一步利用表面活性剂分子诱导的自组装,在纳米线表面生长具有有序介孔结构、且孔道取向垂直于基底的介孔壳层,分别作为产氢催化剂与电化学储能结构单元。该有序介孔壳层/纳米线结构具有合适的能级分布、高比表面、长的光吸收程、短的电荷分离程、可控的介孔尺度、一维连续的电荷传输等结构优点,有利于提高太阳光能吸收、电子与空穴的分离效率、界面电荷转移、材料内电荷传输与电化学反应,以获得具有高光电转化效率、产氢效率与电化学储能容量的介孔/纳米线复合材料。通过结构设计-材料合成-性能测试-反馈优化,拓展光电极设计理念,阐明材料结构与光解水产氢、电化学储能的规律,为开发新型、可自发、同时进行光催化和电能存储的复合电极材料提供科学依据。
中文关键词: 纳米线;介孔结构;核壳结构;光催化;电化学储能
英文摘要: This project aims at the high efficiency of solar energy conversion and storage, and focuses on the two important challenges: the design of semiconductor photoelectrode materials/structures, and the storage of photocatalysis energy. In this project, we propose to rationally synthesize one-dimensional semiconductor photoanode and photocathode arrays with Z-scheme energy structures. In addition, by using a surfactant-templated organic-inorganic self-assembly process, mesoporous shell layers with ordered pore structure and perpendicular pore orientation are grown on the nanowire photoelectrode surface, and served as structured units for hydrogen evolution catalyst and electrochemistry energy storage. These ordered mesoporous-shelled, nanowire hybrid structures have suitable energy band alignment, large specific surface area, long light absorption distance, short charge separation, tunable mesopore size, one-dimensional charge transport properties, and thus are beneficial for improving solar energy absorption, electron/hole pair separation, interface charge transfer, charge transport inside materials, and electrochemical reaction kinetics. Therefore, much enhanced efficiencies in photo-electric conversion, hydrogen evolution and electrochemical energy storage are expected. By the structure design - material synthesis - property measurement - feedback and optimization strategy, we further expect to explore new concept for photoelectrode design, and illustrate the relationships between material structures with photocatalytic hydrogen formation and electrochemical energy storage. Moreover, this project will offer new scientific support for novel electrode composites that allow for spontaneous, simultaneous solar-driven water splitting and electrochemical energy storage.
英文关键词: nanowire;mesoporous structure;core-shell structure;photocatalysis;electrochemical energy storage