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. (28th May 2021)

• Record Type: Journal Article
• Authors: Han, Zhu; Lin, Shi-Yi; Feng, Jiu-Ju; Zhang, Lu; Zhang, Qian-Li; Wang, Ai-Jun
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 37(2021)
• Page Start: 19385
• Page End: 19396
• Publication Date: 2021-05-28
• Subjects: N-doped honeycombed carbon -- Bifunctional catalysts -- Alloy nanoparticles -- Oxygen evolution reaction -- Oxygen reduction reaction -- Zn-air battery; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.03.086
• Languages: English
• ISSNs: 0360-3199

Abstract

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 NH4 Cl 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 ( E onset = 0.98 V vs . RHE) and half-wave potential ( E 1/2 = 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. Graphical abstract: Image 1 Highlights: The FeCo@ N-doped 3D honeycombed carbon was fabricated by a facile pyrolysis method. The multi-compositions and unique structures provided enriched active sites and enlarged active area. The FeCo@N-HC electrocatalyst exhibited the superior ORR/OER activity and durability. The FeCo@N-HC-based Zn-air battery displayed the high power density and excellent stability.