Pd_n-Fe纳米合金作为Mg-H_2O_2半燃料电池阴极研究  

Cathode Performance of Mg-H_2O_2 Semi-fuel Cell with Pd_n-Fe Alloy as Cathode

作　　者：孙丽美[1] 石乐乐[1] 张帅帅[1] 张益佳 李增辉 何乌日嘎木拉 

机构地区：[1]内蒙古民族大学化学化工学院,内蒙古自治区纳米碳材料重点实验室,通辽028000

出　　处：《无机材料学报》2018年第1期81-86,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(21003070,21463017); 内蒙古自然科学基金(2012MS0208)~~

摘　　要：通过化学还原方法制备Pd:Fe原子比(n)为2:1、4:1、8:1的Pd_n-Fe/C催化剂。采用TEM、XRD和XPS技术对复合催化剂进行表征。结果显示,Fe加入Pd/C催化剂中,与Pd形成合金,Pd_n-Fe/C催化剂的粒径发生变化;获得的Pd_4-Fe纳米合金粒子在C载体表面分布均匀,平均粒径为2~3 nm,Fe的加入对Pd/C催化剂晶体结构有很大影响。电化学(CV,LSV,CA)测试表明:加入Fe提高了Pd/C催化剂的催化性能,Pd/Fe原子比为4:1时,Pd_n-Fe/C的催化性能最好。当E=0.2 V时,Pd/C电极电流密度为17.71 mA/cm^2,而Pd_4-Fe/C电极电流密度可达19.42 mA/cm^2。电池测试表明,以Pd_4-Fe/C和Pd/C催化剂为阴极的Mg-H_2O_2半燃料电池的开路电势均为1.8 V左右,而当电流密度为180 mA/cm^2时,以Pd_4-Fe/C为阴极的电池最大能量密度比Pd/C为阴极的电池高41 mW/cm^2。Carbon-supported palladium-iron composite electrocatalysts with different Pd to Fe atom ratios （2 ： 1, 4 ： 1, 8 ： 1） were prepared by a chemical reduction method. The morphology and surface state of the Pdn-Fe/C and Pd/C electrocatalysts were characterized by X-ray diffractionanalysis （XRD）, transmission electron microscopy （TEM） and X-ray photoelectron spectroscopy （XPS）. The results indicated that Fe was added to the Pd/C catalyst and reacted with Pd to form Pdn-Fe alloy, with slightly varied particle size. And the Pdn-Fe catalyst particles were homogeneously distributed on the surface of the C carrier with the average particle size between 2-3 nm. The addition of Fe influenced crystal lattice structure of Pd/C catalysts. Electrochemical （CV, LSV, CA） data showed that the eletrocatalytic activity of the Pd4-Fe/C electrocatalyst for hydrogen peroxide electroreduction was much higher than that of Pd/C. The current density of Pd/C electrode for hydrogen peroxide electroreduction reaction was 17.71 mA/cm2 when E = 0.2 V and the current density of Pd4-Fe/C electrode was up to 19.42 mA/cm2. The Mg-H2O2 semi-fuel cell performance text showed that both the open circuit potential of the two fuel cells were about 1.8 V, of which the power density of Mg-H2O2 semi-fuel cell using Pdn-Fe/C as the cathode was higher 41 mW/cm2 than that using Pd/C as cathode.

关 键 词：FE PD/C H2O2电还原 Mg-H2O2半燃料电池 

分 类 号：TQ174[化学工程—陶瓷工业]