Cobalt-based composite films on electrochemically activated carbon cloth as high performance overall water splitting electrodes |
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| Affiliation: | 1. Department of Polymer and Carbonaceous Materials, Faculty of Chemistry, Wroc?aw University of Science and Technology, Gdańska 7/9, 50-344 Wroc?aw, Poland;2. Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, Queensland 4222, Australia;1. Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Key Laboratory of Polyoxometalate Science of Ministry of Education, National & Local United Engineering Laboratory for Power Batteries, Department of Chemistry, Northeast Normal University, Changchun, Jilin Province 130024, PR China;2. School of Chemistry and Environmental Engineering, The Collaborative Innovation Center of Optical Materials and Chemistry, Changchun University of Science and Technology, Changchun, Jilin Province 130022, PR China;3. National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Key Laboratory of Advanced Battery Materials of Yunnan Province, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China;1. School of Material Science and Engineering, Hebei University of Technology, Dingzigu Road 1, Tianjin 300130, PR China;2. Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Guangrongdao Road 29, Tianjin 300130, PR China;1. Research Laboratory of Real Samples Analysis, Faculty of Chemistry, Iran University of Science and Technology, Tehran, 1684613114, Iran;2. Electroanalytical Chemistry Research Center, Iran University of Science and Technology, Tehran, 1684613114, Iran;3. Research Institute of Petroleum Industry, Tehran 1485733111, Iran;1. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea;2. School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia;3. School of Information Engineering, Tongmyong University, Busan 608-711, Republic of Korea |
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| Abstract: | An attractive approach to obtain effective and stable electrode for water electrolysis is to directly deposit the electrocatalyst on current collector surface. Herein, we show the influence of electrochemical activation of carbon cloth substrate on the morphology and electrocatalytic properties of bifunctional electrodes for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). A simple one-step electrodeposition technique was applied to directly grow mixed Co-based films on electrochemically activated carbon cloth (EACC) surface. The produced films are composed of metallic Co, and largely amorphous CoO/Co(OH)2 phases. Variation of Co2+ concentration in the solution for electrodeposition enabled tuning the composition of mixed films in order to achieve the optimal HER and OER electrocatalytic performance in 0.1 M KOH. The synthesized electrodes require the overpotentials of 195 mV for HER and 340 mV for OER to deliver the current density of 10 mA/cm2. The results indicate that the facile oxidation of carbon cloth prior to the electrodeposition decreases the overpotential at 10 mA/cm2 by 150 and 60 mV for HER and OER respectively, thus opening the perspective of improving the activity of carbon-based self-supported composite electrocatalytic electrodes for advanced energy conversion processes. |
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| Keywords: | Carbon cloth Self-supported Electrocatalyst Electrochemical activation Water splitting Cobalt |
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