The bifunctional 3D-on-2D FeCo/Ni(OH)2 hierarchical nanocatalyst for industrial-level electrocatalytic water splitting |
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| Affiliation: | 1. School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006, China;2. School of Advanced Technology, Xi''an Jiaotong-Liverpool University, Suzhou 215000, China;3. Cybrid Technologies Inc., Suzhou 215217, 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. 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. Instituto Politecnico Nacional. Laboratorio de Nanomateriales Sustentables. Escuela Superior de Ingeniería Química e Industrias Extractivas. Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos, CP 07708 CDMX, Mexico;2. Instituto Politecnico Nacional. Laboratorio de Electroquimica y Corrosion. Escuela Superior de Ingeniería Química e Industrias Extractivas. Av. Instituto Politécnico Nacional S/N, Unidad Profesional Adolfo López Mateos, CP 07708 CDMX, Mexico;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 |
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| Abstract: | Developing high-performing and cost-effective bifunctional electrocatalysts under the industrial conditions is significant for revolutionizing the hydrogen economy. Herein, we developed a bifunctional 3D-on-2D FeCo/Ni(OH)2 hierarchical nanocatalyst on Ni mesh by a facile and low-cost method that can boost both the two half-reactions of water splitting all at once. The FeCo/Ni(OH)2/Ni mesh showed an outstanding electrocatalytic performance under the industrial conditions (3 M KOH, 90 °C) with applied voltages of 1.47 and 1.91 V to drive the electrolyzer at 10 and 500 mA/cm2, respectively, much better than the Ni(OH)2/Ni mesh, FeCo/Ni mesh, and Raney Ni/Ni mesh samples. Furthermore, it can maintain good stability for more than 192 h under the working condition of 500 mA/cm2. This promotion in electrocatalytic properties can be ascribed to the synergistic effects between 3D FeCo nanoparticles and 2D Ni(OH)2 nanosheets, including the large electrochemically active surface areas, the intense electronic interplay between the two component and the elevated interfacial contact and charge transport. Eventually, this water electrolyzer yields a 14.7% solar-to-hydrogen efficiency when integrated with Si solar cells, which exceeds analogous solar-driven systems reported so far. |
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| Keywords: | Bifunctional electrocatalysts Water splitting Industrial applications 3D-on-2d nanostructure Transition metal hydroxides |
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