Pd/CeO2湿法构筑及催化甲酸盐、乙醇电氧化研究  

Wet-chemistry Fabrication of Pd/CeO2 Interfaces and Comparison with Pd/SnO 2 in Terms of Formate and Ethanol Electro-oxidation Catalysis

作　　者：王建设[1] 闫杰杰 张冲[1] 席靖宇 赵建宏[1] 宋成盈[1] WANG Jianshe;YAN Jiejie;ZHANG Chong;XI Jingyu;ZHAO Jianhong;SONG Chengying(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China;Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China)

机构地区：[1]郑州大学化工学院,河南郑州450001 [2]清华大学深圳国际研究生院,广东深圳518055

出　　处：《郑州大学学报（工学版）》2020年第6期85-91,共7页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省自然科学基金资助项目(182300410263);河南省教育厅科学技术研究重点项目(13A150666)。

摘　　要：界面在电催化领域发挥着重要作用,为探索简易廉价的界面构筑方法,尝试用湿化学法制备催化剂,利用Sn(OH)2的还原作用沉积Pd,利用OH-对Ce^3+富集实现CeO2在表面沉积,从而构筑Pd/CeO2界面,并经能量色散X射线谱和X射线光电子能谱证实。电化学结果表明,CeO2与Pd形成界面且不影响Pd的电化学活性面积,说明导电性差的金属氧化物也可通过本方法与贵金属构筑界面。利用循环伏安法和计时电流法进一步比较了Pd/CeO2和Pd/SnO2两类界面对甲酸盐和乙醇电氧化催化行为。结果表明,Pd/CeO2比Pd/SnO2活性更高,原因或为Pd/CeO2界面可抑制CO类中毒产物吸附。所提供界面构筑方法拓展了导电性差的金属氧化物在电催化领域的应用。Interfaces playvital role in various electrocatalysis and thus exploring cheap and facile method for fabricating interfaces was of great significance.In this study,a wet-chemistry method for fabricating Pd/CeO2 interfaces was proposed,in which Pd was in-situ reduced by Sn(OH)2,while CeO2 was formed through Ce^3+enrichment and homogeneous precipitation onto Sn(OH)4 that is transformed from Sn(OH)2.The introduction of CeO2 was confirmed by scanning electron microscope,energy-dispersive spectroscopy and X-ray photoelectron spectroscopy.Electrochemical characterization showed that CeO2 replaced SnO2 surface and hardly lowered the electrochemical active surface area of Pd,meaning that metal oxides with poor electrical conductivity could be used by this fabrication method.The cyclic voltammetry and chronoamperometry were used to further compare the catalytic behavior of Pd/CeO2 and Pd/SnO2 interfaces for the electrooxidation of formate and ethanol.It shows that Pd/CeO2 is more active than Pd/SnO2 for formate and ethanol oxidation,the reason for which might be ascribed to Pd/CeO2 interface that prohibits CO adsorption.We believe that the present study could provide simple avenue for fabricating interfaces between noble metals and metal oxides even with poor electrical conductivity.

关 键 词：湿化学法制备 界面构筑 Pd/CeO2 Pd/SnO2 甲酸盐电氧化 乙醇电氧化 

分 类 号：O646[理学—物理化学]