Journal
JOURNAL OF POWER SOURCES
Volume 192, Issue 2, Pages 385-390Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.03.006
Keywords
Direct borohydride fuel cell; Cobalt hydroxide; Polypyrrole; Catalyst; Cell performance; Performance stability
Funding
- Hi-tech Research and Development Program of China [2006AA05Z120, 2007AA05Z144]
- Education ministry of China [20070335003]
- Science & Technology ministry of Zhejiang province [20071110029]
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A polypyrrole modified carbon-supported cobalt hydroxide (Co(OH)(2)-PPY-C) has been prepared by the impregnation-chemical method and used as the electrode catalyst in a direct borohydride fuel cell (DBFC). The microstructure of Co(OH)(2)-PPY-C has been characterized by X-ray diffraction and transmission electron microscopy. The cell performance and short-term performance stability of the DBFC using the Co(OH)(2)-PPY-C as catalysts have been investigated. A maximum power density of 83 mW cm(-2) has been achieved at 0.6V under ambient conditions. The Co(OH)(2)-PPY-C catalyst demonstrates a smaller value of polarization than the carbon-supported Co(OH)(2) catalyst. Results from electrochemical impedance spectrum analysis confirm that the polypyrrole addition to the cathode effectively decreases its resistance. During operation of the DBFC using Co(OH)(2)-PPY-C as catalyst, the Co(OH)(2) tends to be converted into CoHO2. (C) 2009 Elsevier B.V. All rights reserved.
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