Chromium doping and in-grown heterointerface construction for modifying Ni3FeN toward bifunctional electrocatalyst toward alkaline water splitting |
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| Affiliation: | 1. College of Electromechanical Engineering, College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266061, PR China;2. Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, PR China;1. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;2. Pollution Prevention Biotechnology Laboratory of Hebei Province, Shijiazhuang 050018, China;3. Tianjushi Engineering Technology Group Co., Ltd, Shijiazhuang 050011, China;4. Shijiazhuang Donghua Jinlong Chemical Co., Ltd, Shijiazhuang 052165, China;1. Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, 76080 Jamshoro, Sindh Pakistan;2. Dr. M.A Kazi Institute of Chemistry University of Sindh Jamshoro, 76080, Sindh Pakistan;3. Department of Metallurgy, NED University of Engineering and Technology, Karachi Pakistan;4. Université de Lorraine, CNRS, IJL, F-54000 Nancy, France;5. Department of Inorgnic Chemistry, Crystallography and Mineralogy. (Unidad Asociada al ICP-CSIC), Faculty of Sciences, University of Malaga, Campus de Teatinos, 29071 Malaga, Spain, France;6. Department of Production Engineering and Mechanical Design, Port Said University, Port Fua, 42526, Egypt;7. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;8. Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O.Box 84428, Riyadh 11671, Saudi Arabia;1. Department of Solar Energy, School of Technology, Pandit Deendayal Energy University, Raisan, Gandhinagar, 382426, India;2. Solar Research & Development Center (SRDC), Pandit Deendayal Energy University, Raisan, Gandhinagar, 382426, India;1. Department of Mechanical Engineering, Chungbuk National University, Cheongju, 28644, Republic of Korea;2. Department of Mechanical & Robotics Engineering, Andong National University (ANU), 1375 Gyeong-dong-ro, Andong-si 36729, Gyeongsangbuk-do, South Korea |
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| Abstract: | Exploring high-performance non-noble metal electrocatalysts is pivotal for eco-friendly hydrogen energy applications. Herein, featuring simultaneous Chromium doping and in-grown heterointerface engineering, the Cr doping Ni3FeN/Ni heterostructure supported on N-doped graphene tubes (denoted as Cr–Ni3FeN/Ni@N-GTs) was successfully constructed, which exhibits the superior bifunctional electrocatalytic performances (88 mV and 262 mV at 10 mA cm?2 for HER and OER, respectively). Furthermore, an alkaline electrolyzer, employing Ni3FeN/Ni@N-GTs as both the cathode and the anode, requires a low cell voltage of 1.57 V at 10 mA?cm?2. Cr doping not only modulates the electronic structure of host Ni and Fe but also synchronously induces nitrogen vacancies, leading to a higher number of active sites; the in-grown heterointerface Cr–Ni3FeN/Ni induces the charge redistribution by spontaneous electron transfer across the heterointerface, enhancing the intrinsic catalytic activity; the N-GTs skeleton with excellent electrical conductivity improves the electron transport and mass transfer. The synergy of the above merits endows the designed Cr–Ni3FeN/Ni@ N-GTs with outstanding electrocatalytic properties for alkaline overall water splitting. |
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| Keywords: | Cr doping Nitrogen vacancies Heterointerface Bifunctional electrocatalyst Overall water splitting |
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