High active and easily prepared cobalt encapsulated in carbon nanotubes for hydrogen evolution reaction |
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| Affiliation: | 1. Fuel Cell and Battery Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, 700032, India;2. Powder Metallurgy Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India;3. Academia of Scientific and Innovative Research (AcSIR), Gaziabad-201002, India;1. School of Chemical Engineering, North China University of Science and Technology, Tangshan 063210, China;2. Hebei Province Key Laboratory of Photocatalytic and Electrocatalytic Materials for Environment, North China University of Science and Technology, Tangshan 063210, China;1. National & Local Engineering Laboratory for Motive Power and Key Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, PR China;2. Collaborative Innovation Center of Henan Province for Green Motive Power and Key Materials, Henan Normal University, Xinxiang, Henan, 453007, PR China;1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;1. Department of Chemical Engineering, Alagappa College of Technology, Anna University, Chennai 600025, Tamil Nadu, India;2. Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli 620015, Tamil Nadu, India |
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| Abstract: | We prepared M/CeO2 (M = Fe, Co or Ni) by coprecipitation method, and then fabricated M@CNT/CeO2 electrocatalysts through ethanol decomposition on M/CeO2. Experimental results showed that the activity of Co@CNT/CeO2 for hydrogen evolution reaction (HER) was much higher than that of Fe@CNT/CeO2 and Ni@CNT/CeO2, these experimental results were consistent with the density functional theory (DFT) calculation results. The electrocatalysts from ethanol decomposition on Co/CeO2 at 800 °C with different time were obtained, and their electrocatalytic activities for HER were discussed. Co@CNT-90 showed higher activity than others, when the reaction time exceeded 90 min, their HER activities declined gradually, because long-term ethanol decomposition caused decreased dispersion and thicker layers of carbon nanotube (CNT). To obtain a current density of 10 mA cm−2, overpotential of 181 mV was required for Co@CNT-90, and its polarization curve after 8000 cycles retained a similar performance to the initial polarization curve. The high activity and durability of Co@CNT-90 could be explained from the carbon-encapsulated-metal structure, thus metal was protected by carbon layers and prevented metal from contacting with electrolyte directly. XRD patterns, TEM images and experimental results proved that Co was well encapsulated by CNT. |
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| Keywords: | Nanomaterial Ethanol decomposition CNT Hydrogen evolution Non-precious metal |
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