Transitional metal alloyed nanoparticles entrapped into the highly porous N-doped 3D honeycombed carbon: A high-efficiency bifunctional oxygen electrocatalyst for boosting rechargeable Zn-air batteries |
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Authors: | Zhu Han Shi-Yi Lin Jiu-Ju Feng Lu Zhang Qian-Li Zhang Ai-Jun Wang |
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Affiliation: | 1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Chemistry and Life Sciences, College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China;2. School of Chemistry and Biological Engineering, Suzhou University of Science and Technology, Suzhou 215009, China |
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Abstract: | Rational development of low-cost, durable and high-performance bifunctional oxygen catalysts is highly crucial for metal-air batteries. Herein, transition metal alloyed FeCo nanoparticles (NPs) embedded into N-doped honeycombed carbon (FeCo@N-HC) was efficiently prepared by a one-step carbonization method in the existence of NH4Cl and citric acid. Benefiting from the honeycomb-like architectures and the synergistic effects of the FeCo alloy with the doped-carbon matrix, the as-synthesized FeCo@N-HC exhibited outstanding oxygen reduction reaction (ORR) with the more positive onset potential (Eonset = 0.98 V vs. RHE) and half-wave potential (E1/2 = 0.85 V vs. RHE), coupled with outstanding oxygen evolution reaction (OER) with the lower overpotential (318 mV) at 10 mA cm?2. Besides, the home-made Zn-air battery has the larger power density of 144 mW cm?2 than Pt/C + RuO2 (80 mW cm?2). This research offers some valuable guidelines for constructing robust oxygen catalysts in clean energy storage and conversion technologies. |
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Keywords: | N-doped honeycombed carbon Bifunctional catalysts Alloy nanoparticles Oxygen evolution reaction Oxygen reduction reaction Zn-air battery |
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