无机化学学报

用NH₄F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 NH₄F Complexing Reduction Method

作者	单位
沈娟章	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 中国林业科学研究院林产化学工业研究所，南京 210042
唐亚文	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
陆天虹	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 中国科学院长春应用化学研究所，长春 130022

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。

关键词: 炭载Pd催化剂 NH₄F络合还原法甲酸氧化甲酸分解

基金项目:

Abstract: 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.

Keywords: carbon supported Pd catalyst NH₄F complexing reduction method formic acid oxidation decomposition of formic acid

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沈娟章,唐亚文,陆天虹.用NH₄F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[J].无机化学学报,2012,28(2):326-330.

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