Pt单层修饰Pd/C氧还原催化剂  

Pt monolayer on Pd/C as electrocatalyst for oxygen reduction reaction

作　　者：章欢[1] 戴煜[1] 胡晓宏[1] 陈胜利[1] 陈经广[2] 

机构地区：[1]湖北省化学电源重点实验室,武汉大学化学与分子科学学院,武汉430072 [2]特拉华大学化工系,美国纽瓦克特拉华19716

出　　处：《中国科学：化学》2011年第12期1784-1790,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(20973131);教育部新世纪优秀人才支持计划(NCET-06-0612);中央高校基本科研业务费专项资金资助

摘　　要：分别利用液相热解法和浸渍还原法制备了碳载钯纳米催化剂(Pd/C),并研究了其对氧还原反应的电催化活性。与浸渍还原法相比,液相热解法得到的Pd/C催化剂虽然粒径较大,但表现出较好的氧还原反应(ORR)活性和稳定性.在所制备的Pd/C催化剂基础上,通过置换欠电势沉积的Cu原子单层,获得了Pt单层修饰的Pd/C催化剂,其ORR活性较Pd/C催化剂有显著提高,且与纯Pt/C催化剂接近,而其耐久性则较纯Pt/C催化剂有显著提升,显示出Pt单层催化剂的潜在优势.Carbon supported Pd nanoparticle catalysts（Pd/C） for oxygen reduction reaction（ORR） were synthesized by using the liquid-phase pyrolysis method and the impregnation method respectively.Although the Pd/C catalysts produced in liquid phase method possessed larger particle sizes,they exhibited higher activity for ORR and much better durability as compared with Pd/C prepared by the impregnation-reduction method.By galvanic displacement of the monolayer Cu formed on Pd nanoparticle surface through under potential deposition,Pt monolayer decorated Pd/C catalysts（PtML/Pd/C） were fabricated.The thus prepared Pt monolayer catalysts exhibited ORR activity close and durability superior to the state-of-the-art commercial Pt/C.The Pt mass activity of the PtML/Pd/C catalyst for ORR was more than 4 times higher than that given by the Pt/C,showing a great perspective of the Pt monolayer electrocatalysts in fuel cells applications.

关 键 词：氧还原反应 铂单层催化剂 钯催化剂 核壳结构 欠电势沉积 

分 类 号：O643.36[理学—物理化学]