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<p>Rational construction of advanced bifunctional catalysts with dual-active sites is still challenging for both oxygen reduction (ORR) and oxygen evolution reactions (OER).The design of metal single atom catalysts prepared through high-temperature gas transport is an emerging method. The CoNi-N-C catalyst was prepared by using Co powder and Nickel foam to volatilize atomic dispersed Co,Ni element embedded in nitrogen-doped cotton biomass aerogel of carbon fibers in a high temperature tubular furnace in ammonia atmosphere. In this work, CoNi-N-C-1000 atomically dispersed catalyst was successfully synthesized using the above method. The resulting CoNi-N-C-1000 exhibited excellent bifunctional catalytic performance for ORR (<i>E</i><sub>1/2</sub> = 0.85&#xa0;V) and OER (<i>E</i><sub><i>j</i>=10</sub> = 1.54&#xa0;V) in alkaline electrolytes, which can compete with previously reported bifunctional electrocatalysts. In addition, compared to the Pt/C + RuO<sub>2</sub> mixed catalyst, this bifunctional catalyst can endow the self-made zinc-air battery with better power density (155.4 mW/cm<sup>2</sup>) and cycle stability (157.5&#xa0;h), demonstrating its potential feasibility in practical applications of rechargeable zinc-air batteries.</p>

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Engineering the performance of bifunctional oxygen electrocatalysts by modulating the atomically dispersed Co, Ni on N-doped cotton biomass aerogel of carbon fiber catalysts for rechargeable zinc-air battery

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Zhengyu Yang,
  • Wan Jin,
  • Ke Tang,
  • Shun Wang,
  • Yipeng Xi

摘要

Rational construction of advanced bifunctional catalysts with dual-active sites is still challenging for both oxygen reduction (ORR) and oxygen evolution reactions (OER).The design of metal single atom catalysts prepared through high-temperature gas transport is an emerging method. The CoNi-N-C catalyst was prepared by using Co powder and Nickel foam to volatilize atomic dispersed Co,Ni element embedded in nitrogen-doped cotton biomass aerogel of carbon fibers in a high temperature tubular furnace in ammonia atmosphere. In this work, CoNi-N-C-1000 atomically dispersed catalyst was successfully synthesized using the above method. The resulting CoNi-N-C-1000 exhibited excellent bifunctional catalytic performance for ORR (E1/2 = 0.85 V) and OER (Ej=10 = 1.54 V) in alkaline electrolytes, which can compete with previously reported bifunctional electrocatalysts. In addition, compared to the Pt/C + RuO2 mixed catalyst, this bifunctional catalyst can endow the self-made zinc-air battery with better power density (155.4 mW/cm2) and cycle stability (157.5 h), demonstrating its potential feasibility in practical applications of rechargeable zinc-air batteries.