Effect of Adsorption Potential on CO Oxidation at Au@Pt Nanoparticles Electrodes, A Surface Enhanced Raman Spectroscopic Study

Authors

Pu ZHANG, Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
Yi WEI, Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
Yong-li ZHENG, Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;
Yan-xia CHEN, Hefei National Laboratory for Physical Science at Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;Follow
Zhong-qun TIAN, State Key Laboratory of Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;

Corresponding Author

Yan-xia CHEN(yachen@ustc.edu.cn)

Abstract

The adsorption/oxidation of CO on the 55 nm Au@0.7 nm Pt nanoparticles electrode in both potentiodynamic and potentiostatic modes were investigated by surface enhanced Raman spectroscopy in a thin layer electrochemical flow cell under controlled mass transport, with the aim of clarifying the origin CO oxidation at lower electrode potentials (in current pre-wave region of corresponding cyclic voltammograms). Our results demonstrated that the CO oxidation kinetics differed significantly from the three kinds of different CO adsorption history, with almost no CO oxidation current in the pre-peak potential region after 0.35 V_RHE CO adsorption with or without subsequent holding the potential at 0.06 V_RHE for 30 min, compared to the significant CO oxidation current at lower potentials in both cyclic voltammograms and potentiostatic current transients after CO adsorption at 0.06 V_RHE. In contrast, at the same reaction potential in the pre-wave region both during linear potential sweep and potential step experiments, differences in Raman spectra of saturated CO adlayer with CO adsorption potential of 0.06 V_RHE and 0.35 V_RHE were negligible. Possible origins for the effect of pre-adsorption potential on CO oxidation kinetics are discussed.

Graphical Abstract

Keywords

CO oxidation, pre-peak, surface enhanced Raman spectroscopy

DOI Link

https://doi.org/10.13208/j.electrochem.150309

Publication Date

2015-08-28

Online Available Date

2015-08-28

Revised Date

2015-05-05

Received Date

2015-03-09

Recommended Citation

Pu ZHANG, Yi WEI, Yong-li ZHENG, Yan-xia CHEN, Zhong-qun TIAN. Effect of Adsorption Potential on CO Oxidation at Au@Pt Nanoparticles Electrodes, A Surface Enhanced Raman Spectroscopic Study[J]. Journal of Electrochemistry, 2015 , 21(4): 305-311.
DOI: 10.13208/j.electrochem.150309
Available at: https://jelectrochem.xmu.edu.cn/journal/vol21/iss4/1