用NH_4F络合还原法制备的炭载Pd催化剂对甲酸分解的催化性能和甲酸氧化的电催化性能  

Catalytic Ability for Formic Acid Decomposition and Electrocatalytic Performance for Formic Acid Oxidation of Carbon Supported Pd Catalyst Prepared with NH_4F Complexing Reduction Method

作　　者：沈娟章[1,2] 唐亚文[1] 陆天虹[1,3] 

机构地区：[1]江苏省新型动力电池重点实验室,南京师范大学化学与材料科学学院,南京210097 [2]中国林业科学研究院林产化学工业研究所,南京210042 [3]中国科学院长春应用化学研究所,长春130022

出　　处：《无机化学学报》2012年第2期326-330,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20873065、21073094);江苏高校优势学科建设工程资助项目

摘　　要：直接甲酸燃料电池(DFAFC)的两大问题是炭载Pd(Pd/C)催化剂对甲酸氧化的电催化稳定性不好和Pd催化剂能催化甲酸分解。发现用NH4F络合还原法制备的NH4F修饰Pd/C催化剂对甲酸氧化的电催化活性要比Pd/C催化剂好大约20%,电催化稳定性也要稍优于Pd/C催化剂。在120 s内和30℃下,甲酸在Pd/C催化剂上分解产生38 mL气体,但在NH4F修饰Pd/C催化剂上基本上不分解,因此NH4F修饰主要能抑制Pd催化剂催化分解甲酸的能力,而且又能在一定程度上提高Pd/C催化剂对甲酸氧化的电催化性能。The poor electrocatalytic stability of the Pd/C catalyst and the catalytic decomposition of formic acid by the Pd/C catalyst are two problems for direct formic acid fuel cell（DFAFC）.The results show that the electrocatalytic activity of the NH4F modified Pd/C catalyst prepared with NH4F complexing reduction method for formic acid oxidation is about 20% better than that of the Pd/C catalyst.The electrocatalytic stability of the title catalyst is also better than that of the Pd/C catalyst.Furthermore,formic acid can be decomposed on the Pd/C catalyst to produce 38 mL gas in 120 s at 30 ℃.However,formic acid is almost not decomposed on the NH4F modified Pd/C catalyst.The NH4F modification can mainly inhibit the catalytic ability for the decomposition of formic acid on the Pd/C catalyst.In addition,it can increase in a certain extent the electrocatalytic performance of the Pd/C catalyst for the formic acid oxidation.

关 键 词：炭载Pd催化剂 NH4F络合还原法 甲酸氧化 甲酸分解 

分 类 号：O646[理学—物理化学]