Journal
JOURNAL OF POWER SOURCES
Volume 307, Issue -, Pages 251-258Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.12.131
Keywords
Hydrogen peroxide reduction reaction; Platinum-rare earth alloys; Direct borohydride fuel cells; Electrocatalytic activity
Funding
- Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [IF/01084/2014/CP1214/CT0003, SFRH/BPD/77768/2011, UID/CTM/04540/2013]
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Hydrogen peroxide (H2O2) is being actively investigated as an oxidant for direct borohydride fuel cells. Herein, platinum-rare earth (RE = Sm, Dy, Ho) alloys are prepared by arc melting and their activity for hydrogen peroxide reduction reaction (HPRR) is studied in alkaline media. Cyclic voltammetry and chronoamperometry measurements show that Pt-Sm electrode displays the highest catalytic activity for HPRR with the lowest activation energy, followed by Pt-Ho, while Pt-Dy alloys show practically no activity. Laboratory direct borohydride-peroxide fuel cells (DBPFCs) are assembled using these alloys. The DBPFC with Pt-Sm cathode gives the highest peak power density of 85 mW cm(-2), which is more than double of that obtained in a DBPFC with Pt electrodes. (C) 2015 Elsevier B.V. All rights reserved.
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