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<p>The increasing consumption of fossil fuels and the deterioration of the living environment have prompted people to explore environmentally friendly and sustainable energy sources. At present, precious metal-based catalysts perform well in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), but due to their high price, it was seriously limited to promote the industrialization of electrolytic water, so it was necessary to develop more economical dual-function electrolytic water catalysts. In this paper, Co and Fe with low price and excellent performance were selected to synthesize bimetallic doped metal-organic framework CoFe-BDC/NF by hydrothermal synthesis method based on the terephthalic acid (1,4-BDC). As expected, the overpotential of CoFe-BDC/NF was 165 mV at 20&#xa0;mA/cm<sup>2</sup> for HER, and 348 mV at 100&#xa0;mA/cm<sup>2</sup> for OER in 1&#xa0;M KOH solution. Then the CoFe-BDC/NF was tested with 3000 cycles and time-dependent overpotentials, which showed that the material had good stability. In addition, the CoFe-BDC/NF was tested for overall water splitting and Faraday efficiency. When the CoFe-BDC/NF electrode was employed in the electrolyzer, the voltage was 1.628&#xa0;V to reach 10&#xa0;mA cm<sup>−2</sup>. The volume ratio of H<sub>2</sub> and O<sub>2</sub> released during water electrolysis was about 2:1, and the Faraday efficiency was about 100%.</p>

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Bifunctional Bimetal CoFe-MOF as Effective Electrocatalyst for the Water Splitting

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Junling Chen,
  • Ya Liu,
  • Heng Zhang,
  • Qingyao Lu,
  • Kejing Xie,
  • Yilin Feng,
  • Tiexin Zhang

摘要

The increasing consumption of fossil fuels and the deterioration of the living environment have prompted people to explore environmentally friendly and sustainable energy sources. At present, precious metal-based catalysts perform well in hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), but due to their high price, it was seriously limited to promote the industrialization of electrolytic water, so it was necessary to develop more economical dual-function electrolytic water catalysts. In this paper, Co and Fe with low price and excellent performance were selected to synthesize bimetallic doped metal-organic framework CoFe-BDC/NF by hydrothermal synthesis method based on the terephthalic acid (1,4-BDC). As expected, the overpotential of CoFe-BDC/NF was 165 mV at 20 mA/cm2 for HER, and 348 mV at 100 mA/cm2 for OER in 1 M KOH solution. Then the CoFe-BDC/NF was tested with 3000 cycles and time-dependent overpotentials, which showed that the material had good stability. In addition, the CoFe-BDC/NF was tested for overall water splitting and Faraday efficiency. When the CoFe-BDC/NF electrode was employed in the electrolyzer, the voltage was 1.628 V to reach 10 mA cm−2. The volume ratio of H2 and O2 released during water electrolysis was about 2:1, and the Faraday efficiency was about 100%.