Ag2S与中空Pt复合纳米材料的构建与电催化性能

An important frontier in nanocrystal synthesis is the incorporation of different materials within the same nanostructures as a means of increasing functionality. This project aims at the fabrication of novel nanocomposites for electrochemically catalyzing the methanol oxidation, a key reaction in direct methanol fuel cells. Upon the combination of the structural advantage and electronic coupling effect, the nanocomposites consisting of Ag2S and hollow structured Pt nanoparticles (labeled as Ag2S-hPt) with enhanced catalytic activity and stability towards methanol oxidation are designed and optimized. This project focuses on the controllable syntheses, characterizations, electrochemical evaluation of the Ag2S-hPt composite nanomaterials, and the extension of the synthesis technique towards the systems consisting of Ag2S and other noble metals. The novelty of this project lies in the synthetic approach, which is based on a unique diffusion phenomenon of Ag in core-shell nanostructures, and the investigation of the intrinsic relationship between the catalytic properties and the physical effects in the composite materials, which provides for the theoretical basis for effectively developing novel electrocatalyts with enhanced activity and stability.

将物理和化学性质有显著差异的贵金属和半导体集成在一起实现材料的多功能化是纳米材料合成领域的一个前沿研究方向。本项目就半导体‐贵金属复合纳米材料在能源转化领域的拓展应用展开研究，由Ag2S和中空Pt复合纳米材料的设计和构建入手(标记为Ag2S-hPt)，结合纳米尺度材料的结构优势和复合材料中的电子耦合效应，揭示物理效应与材料催化性能的本征联系，调节并优化复合材料在室温下甲醇氧化反应(直接甲醇燃料电池的阳极反应)过程中的电催化活性;创新性在于材料的合成机制和建立物理效应与催化活性的本征联系，前者基于一个Ag在核壳结构纳米材料中独特的扩散过程，后者能够为高效催化剂的设计奠定理论基础。

将物理和化学性质有显著差异的贵金属和半导体集成在一起实现材料的多功能化是纳米材料合成领域的一个前沿研究方向。本项目就半导体‐贵金属复合纳米材料在能源转化领域的拓展应用展开研究，由Ag2S和中空Pt复合纳米材料的设计和构建入手(标记为Ag2S-hPt)，结合纳米尺度材料的结构优势和复合材料中的电子耦合效应，揭示物理效应与材料催化性能的本征联系，调节并优化复合材料在室温下甲醇氧化反应(直接甲醇燃料电池的阳极反应)过程中的电催化活性;创新性在于材料的合成机制和建立物理效应与催化活性的本征联系，前者基于一个Ag在核壳结构纳米材料中独特的扩散过程，后者能够为高效催化剂的设计奠定理论基础。