Journal
JOURNAL OF POWER SOURCES
Volume 210, Issue -, Pages 321-326Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.02.021
Keywords
Platinum-iridium catalyst; Bifunctional oxygen catalyst; Unitized regenerative fuel cell
Funding
- National Natural Science Foundation of China [50872027, 21106024, 21173062]
- Ministry of Science and Technology of China [2009AA05Z111]
- Fundamental Research Funds for the Central Universities [HIT.ICRST.2010006]
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology [XWQQ5750012411]
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Bifunctional Pt/Ir-x(IrO2)(10-x) (x < 10) catalyst for unitized regenerative fuel cell (URFC) has been prepared by depositing Pt on Ir-x(IrO2)(10-x) support which is obtained initially from Adams fusion method. X-ray diffraction and transmission electron microscopy show that ultrafine and narrow distributed Pt/Ir-3(IrO2)(7) nanocomposites are formed. Electrochemical measurements demonstrate that among the series of catalysts studied, Pt/Ir-3(Iro(2))(7) catalyst possesses the highest electrochemical surface area (24.74 m(2) g(-1)) and the highest activity towards oxygen reduction reaction (ORR) (21.71 mA mg(-1) at 0.85 V). Meanwhile, considerably high activity towards oxygen evolution reaction (OER) (42.35 mA mg(-1) at 1.55V) is also observed for Pt/Ir-3(IrO2)(7) catalyst. Kinetic analyses indicate that ORR on Pt/Ir-3(IrO2)(7) catalyst follows four-electron mechanism. This work opens a new way to fabricate efficient bifunctional oxygen catalyst for URFC. (C) 2012 Elsevier B.V. All rights reserved.
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