【摘 要】
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Efficient bifunctional oxygen electrocatalysts for ORR and OER are fundamental to the development of high performance metal-air batteries.Herein,a facile cost-e
【机 构】
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Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology,
论文部分内容阅读
Efficient bifunctional oxygen electrocatalysts for ORR and OER are fundamental to the development of high performance metal-air batteries.Herein,a facile cost-efficient two-step pyrolysis strategy for the fabrication of a bifunctional oxygen electrocatalyst has been proposed.The efficient non-precious-metal-based electrocatalyst,Fe/Fe3C@Fe-Nx-C consists of highly curved onion-like carbon shells that encapsulate Fe/Fe3C nanoparticles,distributed on an extensively porous graphitic carbon aerogel.The obtained Fe/Fe3C@Fe-Nx-C aerogel exhibited superb electrochemical activity,excellent durability,and high methanol tolerance.The experimental results indicated that the assembly of onion-like carbon shells with encapsulated Fe/Fe3C yielded highly curved carbon surfaces with abundant Fe-Nx active sites,a porous structure,and enhanced electrocatalytic activity towards ORR and OER,hence displaying promising potential for application as an air cathode in rechargeable Zn-air batteries.The constructed Zn-air battery possessed an exceptional peak power density of～147 mW cm-2,outstanding cycling stability (200 cycles,1 h per cycle),and a small voltage gap of 0.87 V.This study offers valuable insights regarding the construction of low-cost and highly active bifunctional oxygen electrocatalysts for efficient air batteries.
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