Electrodeposited osmium three-dimensional anodes for direct borohydride fuel cells

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• 作者：V.W.S. Lam^a ; ^c ; D.C.W. Kannangara^a ; A. Alfantazi^b ; E.L. Gyenge^a ; ^c ; ^{egyenge@chbe.ubc.ca}
• 关键词：Direct borohydride fuel cell ; Electrodeposition ; Three-dimensional electrode
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 August, 2012
• 卷：212
• 期：Complete
• 页码：57-65
• 文件大小：1162 K

摘要

Three-dimensional Os anodes for direct borohydride fuel cells (DBFC) were developed by surfactant assisted electrodeposition of Os on two fibrous graphite substrates, AvCarb鈩?P75 and GF-S3, respectively. Structural characterization of the electrodes using SEM, TEM, and XPS revealed cluster-like Os deposits composed of nano-sized particles of less than 5 nm in diameter with partially oxidized surfaces. The structural and compositional features of the graphite fiber matrixes had a profound influence on the crystallography of the electrodeposited Os. The polycrystalline Os/AvCarb鈩?P75 exhibited superior electrocatalytic activity in cyclic voltammetry compared to Os/GF-S3 with respect to oxidation of adsorbed intermediates. To explain the different activity XRD was used to investigate the crystallographic differences between the two electrodes. A DBFC with Nafion^庐 117 membrane and operated at 333 K, with Os/AvCarb鈩?P75 anode (1.7 mg cm^鈭? Os) and 4 mg cm^鈭? Pt black oxygen cathode catalyst, generated a peak power density of 109 mW cm^鈭? with a standard error of the mean of 卤12 mW cm^鈭? at 90%confidence level. The longer-term durability of the newly developed anodes was investigated.