亲氧性结构对铂表界面醇类分子电氧化的促进机制研究

双功能机理催化体系各功能组份协同催化是醇类电氧化性能提高的关键，而功能组份的亲氧特性构筑至关重要。本项目拟采用亲氧性结构的硒(碲)化物作为新型功能组份构筑铂基双功能机理催化体系,聚焦醇类电氧化的催化活性、稳定性及抗毒化能力等基础科学问题，研究不同纳米结构硒(碲)化物的亲氧性对铂表界面醇类分子电氧化的促进机制,为发展高效醇类燃料电池催化剂提供基础。首先筛选出本征亲氧特性高、电子效应强、锚定力紧密的过渡金属硒(碲)化物纳米材料，通过非金属元素掺杂、表面缺陷及粗糙化、羟基功能化构造提升亲氧特性，增强铂基纳米晶的锚定结合力，抑制纳米颗粒团聚现象，强化各功能组份之间的相互作用，提高双功能机理催化体系的协同催化能力；研究电催化剂理化结构性质与电催化性能的关系，阐明新型催化体系各功能组份的相互作用规律和亲氧特性功能组份对醇类电氧化的促进机理，为形成新型催化剂体系提供研究思路与技术支持。

The synergistic catalysis of different functional components from the bi-functional mechanism catalyst system is pivotal to boosting the performance for alcohols fuel electrochemical oxidation and the oxophilic character of the functional components is very significant. Herein, this project proposed to employ the selenide(telluride) that has oxophilic characters as a novel functional component for constructing bi-functional mechanism catalyst system. The high performance catalyst will be focused on the fundamental scientific problems for alcohols fuel oxidation such as the catalytic activity, stability and anti-poisoning ability. The effect of the oxophilic character of selenide(telluride) with different nano-structure on the promoted catalytic mechanism of Pt interface for alcohols molecular oxidation will be studied and the research results will provide basics for developing highly efficient fuel cells catalysts. The selenide(telluride) with high intrinsic oxophilic character and strong electronic effect and anchoring force will be firstly screened. The selected materials will be employed to further increase its oxophilic character by non-metallic elements doping, defects and roughness and surface hydroxyl functional group construction to increase the bonding force of Pt nanocrystals and depress the nanoparticle agglomeration. This catalyst design will enhance the interaction of different functional components and boost the synergistic catalysis ability in the proposed bi-functional mechanism catalyst system. The relationship between physical-chemical properties and performance for electrocatalysis will be studied with the aim to show the interaction of different components and enhanced catalytic mechanism from the oxophilic character components. The results can offer scientific guidance and technical support of high performance catalyst development for alcohols fuel oxidation.