Solvothermal synthesis of iron phosphides and their application for efficient electrocatalytic hydrogen evolution |
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| Affiliation: | 1. School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China.;2. School of Science and Minzu University of China, Beijing 100081, China.;3. College of Life and Environmental Science, Minzu University of China, Beijing 100081, China.;1. Department of Physics, Peking University, Beijing 100871, P.R. China;2. Beijing Advanced Innovation Center of Materials Genome Engineering, and Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, P.R. China;3. Center for Green Innovation, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, P.R. China;4. Key Laboratory of Micro?Nano Measurement-Manipulation and Physics, Ministry of Education, Department of Physics, Beihang University, Beijing 100191, P.R. China;1. Institute of New Energy Material Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin Key Lab on Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, PR China;2. School of Material Science & Engineering, Jiangsu University, Zhenjiang 212013, PR China;3. Automotive Engineering Research Institute, Jiangsu University, Zhenjiang 212013, PR China;1. State Key Laboratory of Multiphase Complex Systems and Center of Mesoscience, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China;3. Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborate Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China;4. Zhongke Langfang Institute of Process Engineering, Fenghua Road No 1, Langfang Economic & Technical Development Zone, Langfang 065001, China;1. China–Australia Joint Research Center for Functional Molecular Materials, Scientific Research Academy, Jiangsu University, Zhenjiang 212013, Jiangsu, PR China;2. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, PR China |
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| Abstract: | In this paper, we present a solvothermal synthesis of iron phosphide electrocatalysts using a triphenylphosphine (TPP) precursor. The synthetic protocol generates Fe2P phase at 300 °C and FeP phase at 350 °C. To enhance the catalytic activities of obtained iron phosphide particles heat-treatments were carried out at elevated temperatures. Annealing at 500 °C under reductive atmosphere induced structural changes in the samples: (i) Fe2P provided a pure Fe3P phase (Fe3P?500 °C) and (ii) FeP transformed into a mixture of iron phosphide phases (Fe2P/FeP?500 °C). Pure Fe2P films was prepared under argon atmosphere at 450 °C (Fe2P?450 °C). The electrocatalytic activities of heat-treated Fe2P?450 °C, Fe3P?500 °C, and Fe2P/FeP?500 °C catalysts were studied for hydrogen evolution reaction (HER) in 0.5 M H2SO4. The HER activities of the iron phosphide catalyst were found to be phase dependent. The lowest electrode potential of 110 mV vs. a reversible hydrogen electrode (RHE) at 10 mA cm?2 was achieved with Fe2P/FeP?500 °C catalyst. |
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| Keywords: | Solvothermal synthesis Iron phosphide Electrocatalyst Hydrogen evolution Overpotential |
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