EQCM analysis of Bi oxidation mechanism on a Pt electrode |
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Authors: | Sunghyun Uhm Yongsik Yun Yongsug Tak Jaeyoung Lee |
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Affiliation: | aDepartment of Chemical Engineering, Inha University, Inchon 402-751, Republic of Korea;bFuel Cell Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea |
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Abstract: | The electro-oxidation behaviours of bismuth (Bi) species adsorbed on a platinum (Pt) anode were investigated using an in situ electrochemical quartz crystal microbalance analysis in the measurement of cyclic voltammetry (CV) and electrochemical impedance spectroscopy under potentiostatic mode. In the CV of Bi modified Pt, there were four distinct features in the current–potential curves during an anodic scan: (i) the adsorption of water molecules in acidic media, (ii) the formation of Bi oxide, (iii) ionization of Bi oxide and (iv) partial desorption of Bi species. During a cathodic scan, the Bi modified Pt surface recovered to its original state via the reduction of Bi oxide and re-deposition of Bi ion. Surface mass data with electrical charge change and impedance measurements of Bi modified Pt supported the electrocatalytic oxidation of bismuth species as the responsible mechanism. |
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Keywords: | Bismuth Electro-oxidation mechanism EQCM EIS |
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