Carbon-Supported Bimetallic Platinum–Iron Nanocatalysts: Application in Direct Borohydride/Hydrogen Peroxide Fuel Cell
2018
Yi, Lanhua | Yu, Bin | Yi, Wei | Zhou, Yuanqing | Ding, Rui | Wang, Xianyou
Carbon-supported bimetallic platinum–iron nanocatalysts (Pt–Fe/C) with various proportions of atoms, applied to direct borohydride/peroxide fuel cell (DBHFC) anode catalyst, are facilely prepared via a simple and low-cost chemical route in aqueous solution at ambient temperature. Transmission electron microscopy and X-ray diffraction results show the Pt–Fe alloy structure’s existence as well as the mean crystallite size of around 3 nm for Pt–Fe nanoparticles. Enhanced catalytic activity of Pt–Fe/C to BH₄– electro-oxidation has been observed in electrochemical test (chronoamperometry, cyclic voltammetry, single fuel cell test, and rotating disc electrode voltammetry) results, and Pt₆₇Fe₃₃/C shows the best catalytic performance. High maximum power density of 65 mW cm–² for DBHFC is acquired by using Pt₆₇Fe₃₃/C as anode at 25 °C. Furthermore, the electron-transfer number (n) related to BH₄– oxidation is evaluated, and n of 4.9 can be achieved on Pt₆₇Fe₃₃/C electrode.
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