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<p>The sluggish kinetics of the oxygen evolution reaction (OER) serves as a bottleneck in the water-splitting process. Herein, a simple and rapid method has been developed to synthesize amorphous iron–cobalt-layered double hydroxide (a-CoFe<sub>x</sub>-LDH) nanoflowers via a solvothermal approach. The Fe dopant not only weakens the Co–O coordination but also disrupts the crystal structure of Co-LDH, significantly enhancing the electrocatalytic activity of a-CoFe<sub>x</sub>-LDH. Remarkably, by virtue of abundant oxygen vacancies, amorphous structure, and nanoflower morphology, the representative a-CoFe<sub>0.2</sub>-LDH exhibits excellent electrochemical activity for OER with a minimal overpotential (<i>η</i><sub>10</sub> = 239&#xa0;mV), a low Tafel slope (65&#xa0;mV dec<sup>–1</sup>), and long-term electrochemical stability. When constructing a complete water decomposition electrolytic cell with Pt/C || a-CoFe<sub>0.2</sub>-LDH, only an overpotential as low as 1.49&#xa0;V is required. This work presents an effective method for producing cobalt-based LDH amorphous structures with abundant oxygen vacancies, offering new insights into the OER.</p> Graphical abstract <p></p>

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Boosting oxygen evolution reaction via oxygen vacancies and phase engineering on CoFe-layered double hydroxide nanoflowers

  • 期刊论文

  • 发表日期：

    2025年3月27日

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  • Xianbiao Chen,
  • Xiaofeng Yang,
  • Pengyu Guo,
  • Yiwen Chen,
  • Zhe He,
  • Yuan Li,
  • Wenyuan Xu,
  • Zhaohui Hou,
  • Minjie Zhou,
  • Binhong He

摘要

The sluggish kinetics of the oxygen evolution reaction (OER) serves as a bottleneck in the water-splitting process. Herein, a simple and rapid method has been developed to synthesize amorphous iron–cobalt-layered double hydroxide (a-CoFex-LDH) nanoflowers via a solvothermal approach. The Fe dopant not only weakens the Co–O coordination but also disrupts the crystal structure of Co-LDH, significantly enhancing the electrocatalytic activity of a-CoFex-LDH. Remarkably, by virtue of abundant oxygen vacancies, amorphous structure, and nanoflower morphology, the representative a-CoFe0.2-LDH exhibits excellent electrochemical activity for OER with a minimal overpotential (η10 = 239 mV), a low Tafel slope (65 mV dec–1), and long-term electrochemical stability. When constructing a complete water decomposition electrolytic cell with Pt/C || a-CoFe0.2-LDH, only an overpotential as low as 1.49 V is required. This work presents an effective method for producing cobalt-based LDH amorphous structures with abundant oxygen vacancies, offering new insights into the OER.

Graphical abstract