Journal
ELECTROCHIMICA ACTA
Volume 158, Issue -, Pages 209-218Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.01.111
Keywords
Direct borohydride-hydrogen peroxide fuel cell; Anode electrocatalyst; Bimetallic nanocatalyst; Borohydride electrochemical oxidation; Catalytic activity
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Funding
- National Natural Science Foundation of China [21203161, 51202066, U1462121]
- Natural Science Foundation of Hunan Province, China [13JJ4051]
- Key research Items in the Science and Technology Program of Hunan Province, China [2013FJ2013, 2013SK3162]
- Open Foundation of the Innovation platform of the Higher Education Institutions of Hunan Province, China [14K91]
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Carbon supported Pt-Zn bimetallic nanoparticle electrocatalysts (Pt-Zn/C) are facilely prepared by a modified NaBH4 reduction method in aqueous solution at room temperature and investigated as alternative anode catalysts for direct borohydride-hydrogen peroxide fuel cell (DBHFC). The physical and electrochemical properties of the as-prepared nanospherical electrocatalysts are investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV), chronoamperometry (CA) and fuel cell test. Based on results of TEM and XRD, the Pt-Zn nanoparticles show average particle size of approximately 2.5nm on the carbon surface. The fundamental electrochemical results show that the Pt-Zn/C catalysts exhibit much higher catalytic activity and stability for the direct oxidation of BH4 than Pt/C catalyst since Pt atoms are partly substituted by Zn atoms in Pt-Zn catalyst. Among various Pt-Zn catalysts with different compositions, the Pt67Zn33/C catalyst presents the highest catalytic activity for BH4 electrooxidation. The DBHFC using Pt67Zn33/C as anode catalyst and Pt/C as cathode catalyst obtains the maximum power density as high as 79.9mWcm(-2) at 79.5mAcm(-2) and 25 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.
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