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<p>The development of new energy utilization devices is restricted due to the high cost of precious metal catalysts. To solve the problem, a low-cost oxygen reduction reaction (ORR) catalyst was prepared using enzymatic hydrolysis lignin as the carbon source, potassium bicarbonate and melamine as the activator and nitrogen source. The specific surface area of the carbon electrocatalyst (ELC-1N-2&#xa0;K) was 2102 m<sup>2</sup>g<sup>−1</sup>. XPS test results show that the ELC-1N-2&#xa0;K catalyst is successfully doped with nitrogen. Electrochemical tests showed that the prepared porous carbon materials exhibited excellent ORR activity, with a starting potential (E<sub>onset</sub>) of up to 0.98&#xa0;V and a stable half-wave potential (E<sub>1/2</sub>) of 0.83&#xa0;V in the alkaline electrolyte, as well as excellent stability. In addition, the open circuit voltage of zinc air batteries (ZAB) prepared with ELC-1N-2&#xa0;K as the cathode is 1.46&#xa0;V, the maximum power density is 122.56&#xa0;mW/cm<sup>2</sup>, and the specific capacity is 805&#xa0;mAh/g<sub>Zn</sub>. This study offers a new approach for biomass-derived oxygen electrocatalysts and supports the development of low-cost, high-efficiency lignin-based catalysts.</p>

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Lignin-derived porous carbon materials with enhanced oxygen reduction reaction performance for zinc air batteries

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Guoli Pang,
  • Rui Wang,
  • Yuping Zhu,
  • Yiming Liu,
  • Qiang Zhang,
  • Yongfeng Ji,
  • Lili Dong,
  • Tingzhou Lei,
  • Suxia Ren

摘要

The development of new energy utilization devices is restricted due to the high cost of precious metal catalysts. To solve the problem, a low-cost oxygen reduction reaction (ORR) catalyst was prepared using enzymatic hydrolysis lignin as the carbon source, potassium bicarbonate and melamine as the activator and nitrogen source. The specific surface area of the carbon electrocatalyst (ELC-1N-2 K) was 2102 m2g−1. XPS test results show that the ELC-1N-2 K catalyst is successfully doped with nitrogen. Electrochemical tests showed that the prepared porous carbon materials exhibited excellent ORR activity, with a starting potential (Eonset) of up to 0.98 V and a stable half-wave potential (E1/2) of 0.83 V in the alkaline electrolyte, as well as excellent stability. In addition, the open circuit voltage of zinc air batteries (ZAB) prepared with ELC-1N-2 K as the cathode is 1.46 V, the maximum power density is 122.56 mW/cm2, and the specific capacity is 805 mAh/gZn. This study offers a new approach for biomass-derived oxygen electrocatalysts and supports the development of low-cost, high-efficiency lignin-based catalysts.