碱性直接醇类燃料电池pd基阳极催化剂的制备及性能分析-preparation and performance analysis of pd - based anode catalyst for alkaline direct alcohol fuel cell.docx

能提高的主要原因。为了进一步提高掺杂氧化物的助催化性能和催化剂的稳定性，利用溶剂热 法制备了具有一维树枝状纳米线结构的 Pd 掺杂 CeO2 树枝状纳米线，并以包碳 后的树枝状纳米线为载体制备了 Pd/C@Pd-CeO2 NWs 催化剂。研究了 Pd 掺杂 量、反应时间、硝酸添加量等关键因素对制备 Pd 掺杂 CeO2 树枝状纳米线结构 的形貌影响，并提出 Pd 掺杂 CeO2 树枝状纳米线在溶剂热环境中的形成机制； 以包碳后的一维 Pd 掺杂 CeO2 树枝状纳米线为载体，利用微波乙二醇还原法成 功制备了 Pd/C@Pd-CeO2 NWs 催化剂，该催化剂在碱性介质中具有很高的乙醇 氧化反应催化活性和稳定性；研究发现，Pd 的掺杂能够大大的提高 CeO2 释放/ 储存氧能力，提高 CeO2 助催化效率，这是 Pd/C@Pd-CeO2 NWs 催化剂电催化 活性提升的原因；催化剂一维树枝状纳米线 CeO2 载体具有极高的耐腐蚀性能， 这是该催化剂具有高稳定性的重要原因。关键词：碱性直接醇类燃料电池；三相相转移法；Pd 基催化剂；电催化；掺杂CeO2；CeO2 树枝状纳米线-II-AbstractNowadays, alkaline direct alcohol fuel cell (ADAFC) has attracted wide attention by the researchers due to its high energy density, environment friendly. The traditional ADAFC faced some serious problems, such as inferior activity and stability of the catalyst. Therefore, the design of catalysts with low cost, high catalytic activity and high stability of the catalyst became a hot topic in the ADAFC research. In allusion to the problems mentioned above, the high catalytic activity and high stability of the Pd-based catalysts have been designed and prepared, and mechanism of the oxidation reaction of alcohols on the Pd catalyst surface have also been implemented in this thesis.In this paper, the nano core-shell structure Au@Pd catalyst has been prepared by three-phase transfer method. Specifically, method of three-phase transfer process has been optimized, and the key parameters which could influence on core-shell morphology, such as intermediate phase and reducing agent was also analyzed, the activity of the Au@Pd catalyst has been tested, and the mechanism of the activity improvement also be researched; In addition, the dosage of Pd precursor, the kinds and ratio of alloy also have been optimized for higher catalysis activity. The results show that the intermediate phase and reducing agent can affect morphology and the activity of the Au@Pd catalyst by controlling the reduction rate of Pd precursor. The core shell structure Au@Pd catalyst shows much higher activity an