Direct borohydride/peroxide fuel cells using Prussian Blue cathodes

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• 作者：D.M.F. Santos^a ; ^{diogosantos@ist.utl.pt} ; P.G. Saturnino^a ; R.F.M. Lobo^b ; C.A.C. Sequeira^a ; ^{cesarsequeira@ist.utl.pt}
• 关键词：Direct borohydride fuel cell ; Sodium borohydride electrooxidation ; Hydrogen peroxide electroreduction ; Prussian Blue catalyst
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：15 June, 2012
• 卷：208
• 期：Complete
• 页码：131-137
• 文件大小：915 K

摘要

Direct borohydride fuel cells (DBFCs) are receiving much attention during the last decade. Many researchers are now focused on DBFCs operating on sodium borohydride (NaBH₄) as the fuel and hydrogen peroxide (H₂O₂) as the oxidant. In the present work, direct NaBH₄/H₂O₂ fuel cells consisting of platinum (Pt) anodes, a Prussian Blue (PB)-coated Pt or a Pt cathode, and a Nafion N117 membrane as the separator, are assembled. The effect of different operational conditions, namely the fuel (NaBH₄ + NaOH) and oxidant (H₂O₂ + HCl) compositions, as well as the operation temperature, on the performance of these DBFCs is investigated. The obtained results are evaluated and the most suitable conditions for the operation of these NaBH₄/H₂O₂ systems are proposed. The use of the PB-coated electrode can lead to up to a 50%increase in the peak power density, as compared to the cell using a single Pt cathode. At 65 掳C, the DBFC using the PB-modified electrode attained over 200 mW cm^鈭?, at a cell voltage of 0.8 V.