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Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for Methanol
LU Leilei *,DU Baozhong,YANG Rong,LIU Yuyao,LI Yukang
School of Science, Xian University of Technology, Xian 710048
*Correspondence author
#Submitted by
Funding: International Science Technology Cooperation Program of China (No. No. 2015DFR5035), National Natural Science Foundation of China (No.No. 21503166), Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) (No.No. 20116118120017)
Opened online:26 April 2017
Accepted by: none
Citation: LU Leilei,DU Baozhong,YANG Rong.Electrochemical Decontamination of Platinum Nanocrystals and its Electrocatalytic Performances for Methanol[OL]. [26 April 2017] http://en.paper.edu.cn/en_releasepaper/content/4727458
This work focused on the decontamination of polyvinylpyrrolidone(PVP) on platinum by electrochemical treatment. Pt nanocrystals were synthesized by colloidal method using chloroplatinic acid as the metal precursor and PVP K30 as a stabilizer. Spherical, cubic, octahedral and cuboctahedral Pt nanocrystals were obtained by adding different concentrations of silver nitrate to the above colloidal solution. The morphology of Pt nanocrystals was characterized by transmission electron microscope (TEM). It was found that the as-prepared Pt nanocrystals were well dispersed with a narrow size distribution. Electrochemical decontamination was applied to the Pt nanocrystals by short pulse potential step before electrocatalytic performance measurements. Repeating potential steps were set up between high voltage and low voltage. As the potential step proceeding, Pt surface sites were exposed gradually, which could be confirmed from the more and more clear hydrogen and oxygen adsorption/desorption peaks of the cyclic voltammograms (CV). The electrocatalytic activity of the electrochemically cleaned Pt nanocrystals was characterized by CV and chronoamperometry measurements. It was found that cuboctahedral Pt nanocrystals showed the best catalytic activity for methanol electrooxidation. This study put forward a simply and effective electrochemical decontamination method of the Pt surfaces capped by PVP.
Keywords:Pt nanocrystals; methanol; electrooxidation; PVP; electrochemical treatment

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