Hu Liu,Dong-Hui Yang,Xu-Yun Wang,Jiangwei Zhang,Bao-Hang Han
Exploiting low cost and durable electrocatalysts with high efficiency for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) is of great significance for energy conversion and storage applications. Herein, a hybrid electrocatalyst of FeCo alloy nanoparticles embedded in a porous N -doped carbon was prepared via a pyrolysis process of low-cost melamine sponge and mass-produced metal–polyphenol network. Benefting from the metal coordination of metal–polyphenol network and abundant N source of melamine sponge, the metal–N moiety and FeCo alloy nanoparticles (wtih a diameter around 50 nm) encapsulated in a N -doped graphene-like carbon layer were formed in-situ. Such intimate integration of graphene-like carbon-encapsulated FeCo alloys, metal–N active species, and porous structure is conducive to improve the catalytic activity and increase the catalytic durability in alkaline media. As a consequence, the as-prepared electrocatalyst exhibits the pronounced activity toward ORR, OER, and HER simultaneously under alkaline condition, particularly on the performances of potential, stability, and methanol tolerance.
Bo Wang,Qiao Liu,Ao Yuan,Qing Shi,Lan Jiang,Weiyou Yang,Tao Yang,Xinmei Hou
One key step for advancing the widespread practical application of rechargeable metal-air batteries and water electrolysis fundamentally relies on the development of cost-effective multifunctional electrocatalysts toward oxygen and hydrogen-involving reactions. The present work initiates a tofu-derived one-pot strategy for green, facile, and mass production of highly active and stable catalyst toward oxygen reduction/evolution and hydrogen evolution reactions, through the preparation of Fe/Co cross-linked tofu gel and the subsequent pyrolysis. Despite the free use of additional N/P precursors or pore-forming agents, the as-prepared materials comprise highly dispersive FeCo-rich phosphides nanoparticles and porous N,P co-doped carbon network inherited from the tofu skeleton. The resultant catalysts exhibit remarkably enhanced trifunctional activities as compared to the Fe 2 P and Co 2 P counterparts, along with better long-term stabilities than the benchmark RuO 2 and Pt/C catalysts. Accordingly, the as-assembled Zn-air battery delivers a large power density (174 mW cm −2 ) with excellent cycle stability (the gap of charge/discharge voltage@10 mA cm −2 increases by 0.01 V after 720 h of operation, vs . 0.16 V of Pt/C-RuO 2 based battery after 378 h). Furthermore, the as-constructed alkaline electrolyzer just requires a small voltage of 1.55 V@10 mA cm −2 , which outperforms nearly all of those of biomass-derived electrocatalysts ever reported, and that of noble metal catalysts-based electrolyzers (1.72 V@10 mA cm −2 for Pt/C-RuO 2 ), underscoring their bright future toward commercial applications in green energy conversion devices.
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