Electrochemical quartz crystal microbalance study on Au-supported Pt adlayers for electrocatalytic oxidation of methanol in alkaline solution

Underpotential deposition (UPD) of Cu on an Au electrode followed by redox replacement reaction (RRR) of Cu UPD with a Pt source (H 2 PtCl 6 or K 2 PtCl 4 ) yielded Au-supported Pt adlayers (for short, Pt(CuUPD-Pt 4+ ) n /Au for H 2 PtCl 6 , or Pt(CuUPD-Pt 2+ ) n /Au for K 2 PtCl 4 , where n denotes...

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Bibliographic Details
Published in:Science China. Chemistry 2010-11, Vol.53 (11), p.2349-2356
Main Authors: Huang, Zhao, Jia, Xue’En, Xie, QingJi, Tan, YueMing, Huang, SuQing, Huang, JinHua, Meng, Yue, Yao, ShouZhuo
Format: Article
Language:English
Subjects:
Catalysts
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Copper
Electrodes
Gold
Methanol
Microbalances
Noble metals
Oxidation
Platinum
Quartz crystals
Underpotential deposition
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Summary:Underpotential deposition (UPD) of Cu on an Au electrode followed by redox replacement reaction (RRR) of Cu UPD with a Pt source (H 2 PtCl 6 or K 2 PtCl 4 ) yielded Au-supported Pt adlayers (for short, Pt(CuUPD-Pt 4+ ) n /Au for H 2 PtCl 6 , or Pt(CuUPD-Pt 2+ ) n /Au for K 2 PtCl 4 , where n denotes the number of UPD-redox replacement cycles). The electrochemical quartz crystal microbalance (EQCM) technique was used for the first time to quantitatively study the fabricated electrodes and estimate their mass-normalized specific electrocatalytic activity (SECA) for methanol oxidation in alkaline solution. In comparison with Pt(CuUPD-Pt 2+ ) n /Au, Pt(CuUPD-Pt 4+ ) n /Au exhibited a higher electrocatalytic activity, and the maximum SECA was obtained to be as high as 35.7 mA μg −1 at Pt(CuUPD-Pt 4+ )3/Au. The layer-by-layer architecture of Pt atoms on Au is briefly discussed based on the EQCM-revealed redox replacement efficiency, and the calculated distribution percentages of bare Au sites agree with the experimental results deduced from the charge under the AuO x -reduction peaks. The EQCM is highly recommended as an efficient technique to quantitatively examine various electrode-supported catalyst adlayers, and the highly efficient catalyst adlayers of noble metals are promising in electrocatalysis relevant to biological, energy and environmental sciences and technologies.
ISSN:1674-7291
1869-1870
DOI:10.1007/s11426-010-4078-9