In situ surface potential evolution along Au/Gd:CeO2 electrode interfaces

被引：3

作者：

Zhu, Jiaxin ^{[1
]}

Wang, Jiaying ^{[1
]}

Mebane, David S. ^{[2
]}

Nonnenmann, Stephen S. ^{[1
]}

机构：

[1] Univ Massachusetts, Dept Mech & Ind Engn, Amherst, MA 01003 USA

[2] West Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA

来源：

APL MATERIALS | 2017年 / 5卷 / 04期

关键词：

CO2; ACTIVATION; CERIA; MORPHOLOGY; STABILITY; CATALYSTS; OXIDES;

D O I：

10.1063/1.4977206

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We present an investigation of electroactive Au/gadolinium doped ceria electrode interfaces under CO2/CO co-electrolysis environments using a combination of in situ high temperature scanning surface potential microscopy (HT-SSPM) and modified Poisson-Cahn (PC) models. Here charged surface adsorbate-oxygen vacancy interactions manifested in HT-SSPM potential profiles as small perturbations of opposite sign in reference to the applied biases. The positive deviation of surface potential on Au from applied cathodic biases is attributed to the work function difference between gold (phi(Au) similar to 5.31 eV) and graphitic carbon deposits (phi(C) similar to 5.0 eV) formed through CO disproportionation. The negative potential deviation from the applied anodic bias is attributed to negatively charged carboxylates. Results of the PC model confirmed the affinity of oxygen vacancies for the surface, thus supporting in situ experimental evidence of surface vacancy accumulation/depletion processes induced by cathodic/anodic biases. (C) 2017 Author(s).

引用

页数：6

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