晶面可控铂钯基纳米晶上电催化的表面增强红外光谱研究

项目名称： 晶面可控铂钯基纳米晶上电催化的表面增强红外光谱研究

项目编号： No.21273046

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 蔡文斌

作者单位： 复旦大学

项目金额： 90万元

中文摘要： "表面清洁优选"、"结构现场表征"和"反应现场监测"三大问题是现阶段Pt、Pd基晶面优先取向的纳米晶电催化研究的瓶颈。针对此现状，本课题中拟采用特性强吸附物种来置换表面杂质，探索温和、有效的纳米晶清洗方法；结合电化学衰减全反射表面增强红外光谱方法表征探针分子在不同纳米晶面的吸附状态，同时检验晶面的清洁程度；进而应用上述现场红外光谱方法研究在酸、碱性溶液中不同晶面优先取向的Pt、Pd基纳米晶上小分子燃料阳极电催化过程，从分子水平上揭示"纳米晶面-反应性质"关系，澄清相关反应机理。以上研究促进晶面可控纳米单晶（材料）、燃料电池相关电催化（反应）和现场高灵敏光谱技术（方法）三方面有机结合，对创制新一代高性能Pt、Pd基纳米电催化剂具有重要意义。

中文关键词： 电催化；表面增强光谱；铂钯基纳米晶；晶面控制；表面清洁

英文摘要： "Mild and effective surface decontamination", "in situ determination of preferential facets" and "in situ monitoring of reactions" are currently the bottlenecks for investigating electrocatalysis on facet-controlled Pt, Pd-based nanocrystals. To address these issues, we propose to replace the surface impurities on the nanocrystals which are well-synthesized based on wet-chemistry process with certain specifically adsorbed species and explore the mild and effective decontamination method. Also, we plan to apply electrochemical ATR surface enhanced IR absorption spectroscopy (SEIRAS) to characterize the adsorption states of probe molecules on different nanocrystal facets, check the surface cleanness and establish the relationship between spectral information and facet structures of nanocrystals. Furthermore, electrocatalytic processes of small organic fuel molecules on these facets-controlled Pt, Pd based nanocrystals in both acidic and alkaline solutions will be systematically studied with in situ ATR-SEIRAS, in order to reveal the facet dependent electrocatalytic activity and stability on the molecular level, and to provide mechanistic insights into the relevant reactions. The above integrated investigations involve a novel combination of facet-controlled nanocrystals, fuel cell-related electrocatalysis and in s

英文关键词： electrocatalysis；ATR-SEIRAS；Pd;Pd-based nanocrystal；facet-control；surface decontamination