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表面活性剂对微波辅助还原法制备碳载PdAu催化剂的影响及甲酸的电催化氧化

杨秋明1,邬冰1,2,高颖1,2*   

  1. (1.哈尔滨师范大学化学化工学院 哈尔滨 150025;2.功能材料的设计合成与绿色催化实验室 哈尔滨 150025)
  • 收稿日期:2011-11-24 修回日期:2011-12-13 出版日期:2012-10-10 发布日期:2012-10-10
  • 通讯作者: 高颖，教授; Tel:0451-88060853; Fax:0451-88060853; E-mail:yinggao99@126.com; 研究方向：直接甲酸燃料电池
  • 基金资助:
    黑龙江省自然科学基金(B200905)哈尔滨市科技局创新人才专项基金(2010RFXXG018)黑龙江省高校科技创新团队建设计划(2011TD010)资助项目

Effect of Surfactants on Microwave-assisted Reduction Prepared Carbon-supported PdAu Catalysts and Electrooxidation of Formic Acid

YANG Qiuming1, WU Bing1,2, GAO Ying1,2*   

  1. (1.College of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China;
    2.Laboratory of Design and Synthesis of Functional Materials and Green Catalysis,Harbin 150025,China)
  • Received:2011-11-24 Revised:2011-12-13 Published:2012-10-10 Online:2012-10-10
  • Contact: GAO Ying

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摘要： 采用微波辅助还原法制备出高活性碳载PdAu电催化剂，催化剂中Pd与Au能够形成合金，改变了催化剂表面活性组分的电子结构。 使用十二烷基苯磺酸钠和P123表面活性剂制备出的催化剂能够不同程度地促进催化剂中活性粒子的分散，且大幅度提高催化剂对甲酸氧化的电催化活性和稳定性，其中使用表面活性剂P123制备的催化剂对甲酸氧化的峰电流密度可达到196.8×10-3 A/cm2，甲酸氧化4030 s后的稳定电流密度可达21.6×10-3 A/cm2。 CO类强吸附物种在电极表面的吸附依然是电流衰减的主要原因。

关键词: 微波辅助还原法, Pd, Au, 甲酸, 表面活性剂

Abstract: The carbon-supported PdAu(PdAu/C) catalysts are prepared using surfactants of sodium dodecylbenzene sulfonate and P123 via a microwave-assisted reduction method. The results showed that Pd and Au could form alloys and altered the electronic structure of the catalysts′ surfaces. The activity and stability of the catalysts were greatly enhanced by using surfactants in the their preparation as the surfactants can improve the dispersions of metallic particles on the catalysts′ surface as well as increase the proportion of highly active crystal planes. The peak current density on PdAu/C prepared in nonionic surfactant P123 was as high as 196.8×10-3 A/cm2 and the pseudo-steady current density after 4030 s was 21.6×10-3 A/cm2. The strong CO adsorption by the noble metals on the catalyst remained remained as the major reason for the decrease of the oxidation current.

Key words: microwave-assisted reduction, Pd, Au, fomic acid, surfactant

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