Self-assembly of novel cobalt iron phosphate nanoparticles for the solid-state supercapattery and high-performance hydrogen evolution reaction |
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| Affiliation: | 1. Department of Physics, National Institute of Technology, Kurukshetra, Haryana, 136 119, India;2. Section of Chemistry for Technologies (ChemTech), Department of Industrial Engineering, University of Padova, Via Marzolo 9, I-35131 Padova (PD), Italy;3. Department of Physics, Indian Institute of Technology-Delhi, New Delhi, 110016, India;4. Nouveau Monde Graphite, 481 Rue Brassard, Saint-Michel-de-Saints, QC J0K 3B0, Canada;5. Department of Physics, National Institute of Technology, Puducherry, Karaikal, 609609, India;1. Key Laboratory of Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, PR China;2. Key Laboratory of Synthesis of Functional Materials and Green Catalysis, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025, PR China;3. Key Laboratory of Remote Sensing Monitoring of Geographic Environment, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025, PR China;1. Department of Automobile Engineering, College of Engineering and Technology, SRM Institute of Science and Technology, Chengalpattu, 603203, Tamil Nadu, India;2. Department of Mechanical Engineering, College of Engineering Guindy, Anna University, Chennai, 600025, Tamil Nadu, India;1. Research Institute of Macro-Safety Science, University of Science and Technology Beijing, Beijing, 100083, China;2. School of Safety Engineering & Hydrogen Energy Research Centre, Beijing Institute of Petrochemical Technology, Beijing, 102617, China;3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China;1. Department of Physics, National Institute of Technology, Kurukshetra, Haryana, 136119, India;2. Department of Physics, National Institute of Technology-Puducherry, Karaikal, 609609, India |
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| Abstract: | In this article, we report the preparation of novel cobalt iron phosphate nanoparticles which are self-assembled for energy storage, energy conversion, and sustainability. The self-assembled nanoparticles provide an efficient pathway for the transfer of electrons from the bulk of the materials to the interface of the electrode. This hypothesis has been derived from the analysis based on the electrochemical results for the supercapacitor-based energy storage and hydrogen evolution. The electrode consisting of self-assembled nanoparticles exhibits a maximum specific capacity of 280 C g?1 at a specific current of 1 A g?1. The cyclic voltammetric results suggest the prominent charge storage is by the faradaic reaction which has been concluded from Dunn's approach. The supercapattery device utilizing activated carbon (AC) as the negative electrode and cobalt iron phosphate as the positive electrode exhibit a specific capacity of 210 C g?1 at 2 A g?1 while the specific energy of 47.6 Wh kg-1 at 1.6 kW kg?1. Furthermore, the electrode actively catalyzes the electrochemical hydrogen evolution reaction and it can be lowering the overpotential required by the hydrogen generation. It exhibits the overpotential of 197 mV while the electrode represents the long-time (24 h) consistency for hydrogen production. These results indicate that the novel cobalt iron phosphate nanoparticles could be a potential candidate for energy storage and conversion purposes. |
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| Keywords: | Metal phosphates Solid-state supercapattery Distribution of charge storage Hydrogen evolution reaction |
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