Dispersing Effect of Poly (vinyl pyrrolidone) Addition on Platinum/Tin Phosphate/Carbon Black Bifunctional Catalysts for Direct Methanol Fuel Cell

作者：Chun Huang, Yu Cheng, Shiow Kang Yen · 发表于：ECS Meeting Abstracts · 年份：2018 · DOI：10.1149/ma2018-01/30/1813 · 研究领域：Fuel Cells and Related Materials、Conducting polymers and applications

Direct methanol fuel cells (DMFC) are electrochemical conversion device that can produce electricity at high fuel efficiencies, and Pt the excellent and major catalyst in them, is too expensive to be developed for applications widely. Before large-scale consumer use, three technological problems should be solved. 1. The activity of electrodes should be improved to increase efficiency, and then the amount (i.e. cost) of platinum catalyst in electrodes. 2. Poisoning effects of CO on Pt catalyst should be removed. 3. The conductivity of catalyst should be enhanced to reduce the energy waste in system. Nano-sized platinum (Pt) particles were successfully reduced on tin phosphate (SnP) precipitated carbon black (C) to form Pt/SnP/C catalysts. In methanol oxidation reaction (MOR), these catalysts revealed the more electrochemical mass activity and less obvious CO poisoning effects than Pt/C to become potential for bi-functional catalysts. However, the serious agglomeration of Pt is observed. In this study, Poly (vinyl pyrrolidone) (PVP) was firstly added dispersed carbon black supports, assigned to C (PAD), to avoid the further agglomeration after SnP precipitation on them for increasing the specific surface area of SnP on which platinum was reduced, and hence enhancing the electrochemical performance as well as detoxifying function. By using the characterization of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy ...