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<p>To obtain environment-friendly and renewable hydrogen energy, research is being actively conducted towards lowering the hydrogen evolution reaction (HER) energy barrier through various modifications to the surface of a transition metal bimetal electrochemical catalyst. Herein, we report the development of highly N-doped carbon shell-encapsulated cobalt iron nano cube (CoFe@HNCS) through fine-tuning of the nitrogen-doping content in the carbon shell. The pyridinic N-rich N-doped carbon shell, achieved by adding melamine through electrostatic interactions, improves conductivity, increases active sites, and optimizes Gibbs free energy for hydrogen adsorption. In alkaline HER performance, the optimized CoFe@HNC20 exhibits a lower overpotential (98.2&#xa0;mV) than CoFe@NCS (133.2&#xa0;mV) at 10&#xa0;mA&#xa0;cm<sup>−2</sup>. Furthermore, CoFe@HNCS20 as cathode catalyst in anion exchange membrane (AEM) water electrolyzer also shows low cell voltage of 1.808&#xa0;V to achieve the current density of 0.5 A cm<sup>−2</sup>. The expansion of the application to combine solar cells and AEM electrolyzer suggests the possibility of a hydrogen ecosystem.</p>

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Fine-tunable N-doping in carbon-coated CoFe nano-cubes for efficient hydrogen evolution in AEM water electrolysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月20日

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  • Ui Young Lee,
  • Dong In Jeong,
  • Jun Seok Ha,
  • Ju Hyeok Lee,
  • Hyuk Choi,
  • Jung Hyeon Yoo,
  • Hyuck Gu Choi,
  • Hyun You Kim,
  • Bong Kyun Kang,
  • Yoo Sei Park,
  • Dae Ho Yoon

摘要

To obtain environment-friendly and renewable hydrogen energy, research is being actively conducted towards lowering the hydrogen evolution reaction (HER) energy barrier through various modifications to the surface of a transition metal bimetal electrochemical catalyst. Herein, we report the development of highly N-doped carbon shell-encapsulated cobalt iron nano cube (CoFe@HNCS) through fine-tuning of the nitrogen-doping content in the carbon shell. The pyridinic N-rich N-doped carbon shell, achieved by adding melamine through electrostatic interactions, improves conductivity, increases active sites, and optimizes Gibbs free energy for hydrogen adsorption. In alkaline HER performance, the optimized CoFe@HNC20 exhibits a lower overpotential (98.2 mV) than CoFe@NCS (133.2 mV) at 10 mA cm−2. Furthermore, CoFe@HNCS20 as cathode catalyst in anion exchange membrane (AEM) water electrolyzer also shows low cell voltage of 1.808 V to achieve the current density of 0.5 A cm−2. The expansion of the application to combine solar cells and AEM electrolyzer suggests the possibility of a hydrogen ecosystem.