聚苯胺对钯催化甲酸电氧化反应的促进作用

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...

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Bibliographic Details
Published in催化学报 Vol. 36; no. 7; pp. 943 - 951
Main Author 马先斌 冯媛媛 李扬 韩运石 鹿国萍 杨海芳 孔德生
Format Journal Article
LanguageChinese
Published 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 2015
Subjects
甲酸电氧化反应
电催化
聚苯胺
钯
Electrocatalysis
聚苯胺
Formic acid electrooxidation reaction
Palladium
Polyaniline
电催化
甲酸电氧化反应
钯
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ISSN0253-9837
1872-2067
DOI10.1016/S1872-2067(15)60863-4

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Summary: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.
Bibliography: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 15
ISSN:0253-9837
1872-2067
DOI:10.1016/S1872-2067(15)60863-4