Direct analysis of platinum loading on electrode

doi:10.7523/j.issn.2095-6134.2015.04.007

Abstract

Abstract: A simple, easy-handling, and ultrasensitive quantitative analysis of platinum (Pt) component based on ultraviolet-visible (UV-Vis) spectroscopy is carried out to determine the real Pt loading on glass-carbon electrode. On the basis of the acquired data, the electrochemical active surface area (ECSA) and the peak current (Ip) of methanol electrochemical oxidation as the indicative parameters of the model catalyst (commercial platinum/carbon (Pt/C)) are calculated precisely. For the comparison purpose, the ECSA and Ip are also specified by the theoretical Pt loading calculated based on the Pt content of bulk materials and the ink coating on electrode. The results show that the relative standard deviations of both the ECSA and Ip averaged by real Pt loading decrease significantly, indicating that the data calibrated by real Pt content reflect the intrinsical properties of the commercial Pt/C. Our research may help to increase the accuracy of Pt-containing catalyst evaluation, make the data in different reports comparable, and improve performance of fuel cell catalysts.

Key words: Pt content determination, UV-Vis spectrophotometry, Pt catalyst, methanol oxidation

CLC Number:

O643.36

XUE Qiong, ZHANG Zhikun, HE Yujian, YANG Jingkui, YANG Zhiyong. Direct analysis of platinum loading on electrode[J]. , 2015, 32(4): 468-475.

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