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Testing PtRu/CNF catalysts for a high temperature polybenzimidazole-based direct ethanol fuel cell. Effect of metal content

Paper ID Volume ID Publish Year Pages File Format Full-Text
47058 46457 2011 7 PDF Available
Title
Testing PtRu/CNF catalysts for a high temperature polybenzimidazole-based direct ethanol fuel cell. Effect of metal content
Abstract

Catalysts with high and low metal contents, Pt–Ru (1:1 molar ratio), supported on carbon nanofibres for the electro-oxidation of ethanol have been studied in a H3PO4-doped polybenzimidazole-based fuel cell, using ethanol fed as a vapour and operating in the temperature range 150–200 °C. The catalysts were synthesised using ethylene glycol as a reducing agent and were characterized by X-ray diffraction, TEM, SEM, BET area measurements and temperature-programmed reduction. The catalyst with the highest metal percentage showed the highest Ru alloy level. A similar crystallite size was obtained for both catalysts and oxide species were not detected. Both catalysts showed very high stability to the sintering processes during cyclic voltammetry studies. Moreover, both catalysts were tested in a direct ethanol fuel cell (DEFC) operating at high temperature (125–200 °C) and with low Pt loading in both electrodes (1 mg Pt cm−2). A positive effect of temperature was observed in both cases. The catalyst with 60% PtRu gave the highest activity in ethanol oxidation and the performance was good, which makes PtRu/CNF a promising candidate for use in a DEFC operating at high temperature.

Graphical abstract.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► PtRu/CNF in a DEFC operating at high temperature is reported for the first time. ► The PtRu/CNF showed a very high resistance to the agglomeration in acid media. ► 35 mW cm−2 was reached at 200 °C, ambient pressure, and 1 mg Pt cm−2 in both electrodes. ► Catalyst with the higher metal content achieved the higher Ru alloy level.

Keywords
Carbon nanofibres; Ethanol; High temperature; Polybenzimidazole membrane; Pt:Ru/CNF
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Testing PtRu/CNF catalysts for a high temperature polybenzimidazole-based direct ethanol fuel cell. Effect of metal content
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 106, Issues 1–2, 21 July 2011, Pages 174–180
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us