聚苯胺对钯催化甲酸电氧化反应的促进作用（英文）  

Promoting effect of polyaniline on Pd catalysts for the formic acid electrooxidation reaction

作　　者：马先斌 冯媛媛[1] 李扬[1] 韩运石 鹿国萍 杨海芳[1] 孔德生[1] 

机构地区：[1]曲阜师范大学化学与化工学院,山东省生命有机分析重点实验室,山东曲阜273165

出　　处：《催化学报》2015年第7期943-951,共9页

基　　金：supported by the National Natural Science Foundation of China(21403125);the Scientific Research Foundation for the Outstanding Young Scientist of Shandong Province(BS2011NJ009)~~

摘　　要：钯基纳米材料是甲酸电氧化反应的优良催化剂.本工作制备了两个系列钯基催化剂,并考察了聚苯胺对钯上甲酸电氧化反应的助催化作用.一种是以聚苯胺为基底,在其表面电沉积钯纳米粒子,制得n PANI/Pd催化剂(n表示聚合苯胺的循环数);另一种是直接在商业Pd/C催化剂表面电聚合苯胺,制得Pd/C/n PANI催化剂.结果显示,聚苯胺单独存在时对甲酸电氧化反应没有催化活性,但其可对钯上甲酸电氧化反应呈现明显的促进作用,且促进作用与聚苯胺的厚度(聚合循环数)密切相关.在两个系列催化剂中,15PANI/Pd和Pd/C/20PANI显示出最高的催化性能.15PANI/Pd中钯的质量比催化活性是纯钯催化剂的7.5倍;Pd/C/20PANI中钯的质量比催化活性和本征催化活性分别是商业Pd/C催化剂的2.3和3.3倍.钯催化性能的提升与聚苯胺和钯纳米粒子间的电子效应有关.Pd-based nanomaterials have been considered as an effective catalyst for formic acid electrooxida- tion reaction （FAOR）. Herein, we reported two types of polyaniline （PANI）-promoted Pd catalysts. One was an nPANI/Pd electrocatalyst prepared by the electropolymerization of aniline and the electrodeposition of Pd. The other was a Pd/C/nPANI catalyst prepared by the direct electropoly- merization of aniline on a commercial Pd/C catalyst. The results show that PANI alone has no cata- lytic activity for FAOR; however, PANI can exhibit a significant promoting effect to Pd. The current densities of FAOR on the Pd catalysts with a PANI coating show a significant increase compared with that of the Pd reference catalyst without PANI as a promoter. The promoting effects of PANI are strongly dependent on the electropolymerization potential cycles （n）. The highest catalytic activities for FAOR of all the nPANI/Pd and Pd/C/nPANI catalysts were those of 15PANI/Pd and Pd/C/20PANI. The mass-specific activity （MSA） of Pd in 15PANI/Pd was 7.5 times that of the Pd catalyst, and the MSA and intrinsic activity of Pd/C/20PANI were 2.3 and 3.3 times that of the Pd/C catalyst, respectively. The enhanced performance of Pd catalysts is proposed as an electronic effect between Pd nanoparticles and PANI.

关 键 词：钯 聚苯胺 电催化 甲酸电氧化反应 

分 类 号：O621.251[理学—有机化学]