Co-based MOF-derived Co/CoN/Co2P ternary composite embedded in N- and P-doped carbon as bifunctional nanocatalysts for efficient overall water splitting |
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| Affiliation: | 1. MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, People''s Republic of China;2. College of Materials Science and Engineering, Hunan University, Changsha, 410082, Hunan, People''s Republic of China;3. Division of Engineering Science, Faculty of Applied Science & Engineering, University of Toronto, St. George (Downtown Toronto) Campus, 27 King''s College Cir, M5S, Toronto, ON, Canada;4. MOE Key Laboratory of Materials Physics, School of Physics and Engineering, Zhengzhou University, Zhengzhou, 450001, China;1. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021, PR China;2. Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, PR China;3. University of Chinese Academy of Sciences, Beijing, 100190, PR China;4. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun, 130022, PR China;5. Hainan Provincial Key Lab of Medicine and Food Homologous Plant Resources, Hainan Institute of Science and Technology, Haikou, 571126, PR China;1. School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou City, Jiangsu Province 215009, China;2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Peter the Great Saint-Petersburg Polytechnic University, 195251 Saint Petersburg, Russia;4. Chemical Engineering & Pilot Plant Department, Engineering Research Institute, National Research Centre, 33 El-Buhouth St., Dokki, Cairo 12622, Egypt;1. School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;2. Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China;1. Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea;2. The Research Institute of Industrial Science, Hanyang University, Seoul, 133-791, Republic of Korea;3. Korea Institute of Industrial Technology, 137-41 Gwahakdanji-ro, Gangneung-si, Gangwon, 25440, Republic of Korea |
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| Abstract: | In this work, we developed ternary metallic cobalt-cobalt nitride-dicobalt phosphide composite embedded in nitrogen and phosphorus co-doped carbon (Co/CoN/Co2P-NPC) as bifunctional catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The as-prepared Co/CoN/Co2P-NPC is achieved by simultaneous annealing and phosphating of a Co–N rich metal-organic frameworks (MOFs) precursor. Compare with the phosphorus-free Co/CoN embedded nitrogen-doped carbon electrocatalyst (Co/CoN-NC), the as-prepared Co/CoN/Co2P-NPC display superior HER and OER low overpotential of 99 mV and 272 mV at current density of 10 mA cm?2. When Co/CoN/Co2P-NPC electrocatalyst is use as bifunctional catalysts in overall alkaline water splitting, it exhibit excellent behaviour with 10 mA cm?2 current at overall cell potential of 1.60 V. The excellent performance of Co/CoN/Co2P-NPC electrocatalyst is attributed to the phosphating process that could further enhance synergistic effect, create stronger electronic interactions, and form efficient dual heteroatom doping to optimize the interfacial adhesion within the electrocatalyst. This present work will create more opportunities for the development of new, promising and more active sites electrocatalysts for alkaline electrolysis. |
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| Keywords: | Ternary Co-Based composite Metal organic framework Heteroatoms doped carbon Bifunctional electrocatalyst Overall water splitting |
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