Triton X-100 mediated synthesis of cobalt nitrogen-doped carbon nanocrystals as bifunctional oxygen electrocatalysts AITranslate

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Chinese Library Classification Number:O643.36[理学—物理化学];TB383[理学—化学]

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Zeolitic imidazolate framework(ZIF-67)derived metal-nitrogen carbon composites have emerged as promising bifunctional catalysts for oxygen reduction(ORR)and oxygen evolution reaction(OER),due to their high specific surface area and well-defined porous structure.However,the oversized ZIF-67 precursor severely restricts the catalytic activity of the cobalt-nitrogen carbon materials,making the synthesis of cobalt-nitrogen carbon nanocrystals a significant challenge.In this study,a Triton X-100-mediated strategy was developed to synthesize ZIF-67 nanocrystals,followed by the preparation of cobalt-nitrogen carbon nanocrystals(Co-NC-800)with a diameter of~30 nm after pyrolysis processes.Co-NC-800 nanocrystals exhibited a high specific surface area of 447.4 m²/g,featuring hierarchical porosity and an abundance of catalytically active sites,which promoted the efficient mass transfer/diffusion pathways for oxygen and ion transmission.Owing to these structural advantages,the Co-NC-800 nanocrystals exhibited remarkable bifunctional performance,with a competitive ORR half-wave potential of 0.83 V and a low OER potential of 1.63 V at 10 mA/cm²,comparable to those of commercial Pt/C and RuO₂,respectively.The rechargeable Zn-air battery assembled using Co-NC-800 nanocrystals achieved a peak power density of 116.5 mW/cm² and maintained excellent stability for over 100 h at a current density of 10 mA/cm².This work not only proposes a novel synthetic method for ZIF-67 nanocrystals but also provides new insights into the design of high-performance non-precious metal-based bifunctional electrocatalysts.