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规则贵金属等离激元热电子跃迁注入PEC水解机制研究

批准号11704107 学科分类光与物质的相互作用 ( A040405 )
项目负责人彭小牛 负责人职称讲师 依托单位湖北大学
资助金额27.00
万元
项目类别青年科学基金项目 研究期限2018 年 01 月 01 日 至
2020 年 12 月 31 日
中文主题词贵金属;等离激元;热电子;PEC水解
英文主题词nobel metal;surface plasmon;hot electron; photoelectrochemical water splitting

摘要

中文摘要 随着能源问题日益严峻,利用光电化学 (PEC)水解析氢/析氧实现太阳光能向化学能的转化存储, 成为解决能源危机重要潜在途径,而 PEC水解电极半导体材料面临着吸收系数低、能带间隙大及表面活性低三大挑战。利用贵金属等离激元热电子(hot electron)跃迁注入效应,可以有效解决上述缺陷。本项目主要研究等离激元热电子跃迁注入效应对PEC水解性能的优化增强机制,以规则贵金属(Au/Ag)纳米结构(纳米棒阵列)为基础,构建金属-半导体-催化剂复合纳米体系,通过改变金属纳米阵列中等离激元共振模式,调控其弛豫衰减产生的热电子能量,引导其克服界面势垒跃迁至半导体导带,并进一步通过氧化/还原催化剂的促进,增强复合结构PEC水解催化活性,优化其能量转换效率。本项目从热电子的产生、传输及使用三个层面,研究热电子跃迁注入效应增强PEC水解析氢/析氧催化活性机制,为等离激元新能源器件的开发设计提供参考思路。
英文摘要 With the intense global energy crisis, the oxygen/hydrogen evolution through the photoelectrochemical water splitting becomes the potential solution for the shortage of the energy supply. As the main electrode for the PEC water splitting, the semiconductor suffers from the disadvantages of the low absorption coefficient, the large band gap and the poor surface activity, which greatly limits the efficiency of the energy conversion and can be efficiently optimized by the hot-electron injection process of the surface plasmon. In our proposal, we mainly focus on the mechanism of the enhanced PEC catalytic performance caused by the hot-electron injection process of the surface plasmon. Basing on the Au/Ag nanoarrays, the metal-semiconductor-catalyst composite nanostructure will be synthesized. The resonant mode of the surface plasmon in the nanoarrays will be modulated, in order to optimize the energy of the hot electrons decayed form the surface plasmon. Then the hot electrons will be guided transit to the conduction band of the semiconductor through the surface energy barrier, and lately join the oxidation or reduction reactions in the catalyst. The energy conversion efficiency of the PEC water splitting will be significantly enhanced and catalytic properties of the heterostructure will be obviously optimized. In this proposal, the improved catalytic performance of the PEC process is studied form the generation, transition and utilization of the hot electrons, which provides intriguing strategy for the application of the plasmon-enhanced new energy devices.
结题摘要

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