DBHFC阴极铂合金催化剂的制备及其电催化性能  

Preparation and Electro-catalytic Performance of Platinum Alloy Nano-particles as Cathode Catalysts for Direct NaBH_4-H_2O_2 fuel cell

作　　者：郭章飞[1] 郑丹[1] 吕林[1] 马国仙[1] 董瑾[1] 

机构地区：[1]上海应用技术学院化学与环境工程学院,上海201418

出　　处：《功能材料与器件学报》2012年第4期272-277,共6页Journal of Functional Materials and Devices

基　　金：国家自然科学基金(批准号:60936003)

摘　　要：采用浸渍还原法分别制备了两种不同铂含量的Pt/C纳米催化剂和Pt-Mn/C、Pt-Co/C纳米合金催化剂,利用XRD和TEM技术对催化剂的粒径大小、晶体结构和晶格常数进行表征,并对四种催化剂进行了循环伏安、线性扫描伏安和电流-时间测试。结果表明:四种催化剂的平均粒径均在10nm以下,且Pt-Mn/C、Pt-Co/C两种合金催化剂的粒径均小于Pt/C催化剂;四种催化剂均为面心立方晶体结构;与Pt/C催化剂相比,两种合金催化剂的晶格常数有所减小,且结晶度较低。电化学性能测试表明,两种Pt合金催化剂较相同Pt载量的纯Pt催化剂具有更高的还原峰电位和更大的还原峰电流,其中Pt-Co/C催化剂的还原峰电位和峰电流最大;在催化剂稳定性方面,两种Pt合金催化剂要优于两种纯Pt催化剂。Using impregnation - chemical reduction method, we prepared two Pt/C nano - catalysts with different platinum content and Pt- Mn/C, Pt- Co/C nano -alloy catalyst. The size, structure and lattice constant of these types of catalysts were characterized by XRD and TEM techniques. Then we tested the cyclic vohammetry, linear sweep voltammetry and current - time curve of the four catalysts. The results show that ： the average particle size of the four catalysts are below 10 nm, and Pt - Mn/C, Pt - Co/C are smaller than two pure Pt/C catalysts ; four catalysts are all face - centered cubic crystal structure ; com- pared with Pt/C catalyst, the lattice constants of the two alloy catalysts have been reduced, and have a lower degree of crystallinity. The electrochemical performance tests show that： compared with the two kinds of pure Pt catalyst, two Pt alloy catalysts have a higher reduetive peak potential and peak current,and Pt - Co/C catalyst has the highest reductive peak potential and peak current. The stability of the two kinds of alloy catalyst is superior to both pure Pt catalysts.

关 键 词：铂合金 阴极催化剂 电还原 双氧水 NaBH4-H2O2燃料电池 

分 类 号：TQ152[化学工程—电化学工业]