Efficient oxygen reduction electrocatalysis on Mn3O4 nanoparticles decorated N-doped carbon with hierarchical porosity and abundant active sites |
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| Affiliation: | 1. Key Laboratory of Luminescent and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, School of Materials & Energy, Southwest University, Chongqing 400715, PR China;2. Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China;1. Department of Mathematics, Karnatak University, Pavate Nagar, Dharwad, 580003, India;2. Department of Computer Science (MCA), KLE Technological University, BVB Campus, Hubli, 580031, India;3. Department of Mathematics, IIT Madras, Chennai, 600036, India;1. School of Chemical Engineering, Sichuan University, 610065, Chengdu, China;2. Biogas Institute of Ministry of Agriculture, Chengdu, 610041, China;1. Institute of High Temperature Electrochemistry of the Ural Branch of the RAS, 20 Academicheskaya, Ekaterinburg, 620990, Russia;2. Ural Federal University Named After the First President of Russia B. N. Yeltsin, 19 Mira, Ekaterinburg, 620002, Russia;3. Institute of Solid State Chemistry of the Ural Branch of the RAS, 91 Pervomaiskaya, Ekaterinburg, 620990, Russia;1. School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong, 529020, China;2. Department of Materials Science & Engineering & Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China;3. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China |
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| Abstract: | Transition metal on nitrogen-doped carbons (M-N-C, M = Fe, Co, Mn, etc.) are a group of promising sustainable electrocatalysts toward oxygen reduction reaction (ORR). Compared to its Fe, Co analogues, Mn–N–C possesses the advantage of being inert for catalyzing Fenton reaction, and thus is expected to offer higher durability, but its ORR activity needs essential improvement. Herein, an efficient Mn–N–C ORR catalyst composed of Mn3O4 nanoparticles supported on nitrogen-doped carbon was successfully synthesized by pyrolysis of cyanamide/Mn-incorporated polydopamine (PDA) film coated carbon black (CB), where the presence of N-rich cyanamide confers abundant Mn-Nx active sites and rich micropore/mesopores to the catalyst. In an alkaline medium, as-synthesized Mn–N–C electrocatalyst outperforms commercial Pt/C catalyst in terms of onset potential (0.98 V, vs. RHE), half-wave potential (0.868 V, vs. RHE), and limiting current density. Meanwhile, it exhibits excellent durability and resistance to methanol. In a Zinc-air primary battery, it demonstrates better performance as a cathodic catalyst than Pt/C. |
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| Keywords: | Oxygen reduction reaction Mn–N–C Polydopamine Cyanamide Zinc-air battery |
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