基于ALD技术可控制备Pd基核壳结构催化剂及其电催化氧化甲酸的机理初探

项目名称： 基于ALD技术可控制备Pd基核壳结构催化剂及其电催化氧化甲酸的机理初探

项目编号： No.21306119

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 化学工业

项目作者： 陈金伟

作者单位： 四川大学

项目金额： 25万元

中文摘要： 核壳结构纳米复合材料由于独特的物理、化学特性而具有广泛的应用前景。针对此类材料制备过程中单分散和壳层厚度的控制问题，以及形成机理尚需完善的情况，结合先进的原子层沉积（ALD）技术的自限制生长的优点，本项目提出开展基于ALD技术可控制备核壳结构纳米催化剂的研究工作。其次，结合实际应用，具体化研究对象，针对核壳结构电催化剂在新能源领域直接甲酸燃料电池中的应用前景和存在问题，提出重点研究Pd基核壳结构催化剂。本项目首先制备几种不同过渡金属核基底材料并采用ALD技术在其表面沉积少量氧化物进行修饰，从而研究核基底材料及其表面修饰对壳层Pd原子层沉积过程的影响机制；然后，重点研究反应器类型、前驱体比例、沉积温度等沉积条件对成膜机制的影响；最后，初步探索该类催化剂对甲酸电氧化的催化机理。该项目将对核壳结构纳米材料的制备提供有益的理论基础，也为解决直接甲酸燃料电池阳极催化剂的研发问题提供新材料和新方法。

中文关键词： 原子层沉积；核壳结构；钯；甲酸；电氧化

英文摘要： The core-shell structured nano-composite materials have showed broad application potentials due to their unique physical and chemical properties. However, the preparation of monodisperse and the control of shell thickness are still challenges for nano-scientists, as well as the growth mechanism is yet to be completed. Taking into account the advantages of the self-limiting growth of state-of-the-art atomic layer deposition (ALD) technology, this project is proposed to carry out the controlled preparation of the core-shell structure nanocatalysts based on ALD technology. Moreover, considering the application potential and problems of core-shell structure electro-catalysts for the direct formic acid fuel cell, the project focuses on the study of Pd-based core-shell structured nanocatalysts. The project first will prepare several different transition metal core substrate materials and modify the core by deposition of a small amount of oxide using ALD technology, and then study the effect of the properties of core substrate on the mechanism of shell Pd atomic layer deposition process. Secondly, the research focuses on the impact of the type of reactor, the proportion of precursor, deposition temperature. Finally, explore the catalytic mechanism of these core-shell structured catalysts for the formic acid electro-oxi

英文关键词： Atomic Layer Deposition；Core-shell structure；Palladium；Formic acid；Electro-oxidation