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Investigation of Carbon Supported Nanostructured PtAu Alloy as Electrocatalyst for Direct Borohydride Fuel Cell
Author(s) -
İyigün Karadağ Ç.,
Behmenyar G.,
Boyacı San F. G.,
Şener T.
Publication year - 2015
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201300060
Subject(s) - sodium borohydride , bimetallic strip , electrocatalyst , borohydride , materials science , x ray photoelectron spectroscopy , catalysis , chemical engineering , electrochemistry , carbon fibers , inorganic chemistry , analytical chemistry (journal) , chemistry , electrode , composite material , organic chemistry , composite number , engineering
Carbon supported bimetallic PtAu electrocatalysts for sodium borohydride electrooxidation are prepared by a modified citrate stabilized NaBH 4 reduction process at different pH and temperature values. The physical properties of the materials are characterized by X‐ray diffraction spectroscopy, energy dispersive spectrometry, X‐ray photoelectron spectroscopy and transmission electron microscopy. Nano sized electrocatalysts have narrow size distributions and are uniformly dispersed on the surface of carbon support. Electrochemical performances of catalysts for sodium borohydride electrooxidation are tested with 25 cm 2 single fuel cell. The highest performance is obtained at a peak power density of 161 mW cm −2 with 20 wt. % PtAu/C catalyst of 7.03 nm. Impact of the fuel cell operation parameters including concentration of NaBH 4 , flow rates of oxidant and fuel, and fuel cell operation temperature are investigated. The best operation parameters are obtained at 1 M NaBH 4 concentration, 3 cm 3 min −1 NaBH 4 flow rate, 0.2 dm 3 min −1 oxygen flow rate and 65 °C fuel cell temperature.