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Carbon-Supported Bimetallic Platinum–Iron Nanocatalysts: Application in Direct Borohydride/Hydrogen Peroxide Fuel Cell

Yi, Lanhua, Yu, Bin, Yi, Wei, Zhou, Yuanqing, Ding, Rui, Wang, Xianyou
ACS sustainable chemistry & engineering 2018 v.6 no.7 pp. 8142-8149
X-ray diffraction, alloys, ambient temperature, anodes, aqueous solutions, borohydrides, catalysts, catalytic activity, crystallites, electrochemistry, electron transfer, fuel cells, hydrogen peroxide, nanoparticles, oxidation, transmission electron microscopy
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.