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<p>Amorphous Co-B powder was synthesized via a finely-controlled chemical reduction of cobalt chloride with potassium borohydride in aqueous solution. The microstructure and morphology of the product were analyzed using X-ray diffraction, Scanning Electron Microscope/ Energy Dispersive Spectrometer, transmission electron microscope/ selected area electron diffraction, differential scanning calorimetry, and X-ray photoelectron spectroscopy. The electrocatalytic activity of the Co-B catalyst towards the borohydride oxidation reaction (BOR) was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, chronoamperometry, chronopotentiometry, and electrochemical active surface area measurements. Research has shown that Co-B is an amorphous solid particle that exhibits excellent electrocatalytic activity and stability toward borohydride due to its unique three-dimensional structure, in which a moderate number of spherical particles are stacked on top of one another. It is evident that Co-B sample can serve as an anode catalyst for direct boron–hydrogen fuel cells (DBFCs). The practical performance of the Co-B catalyst was assessed in a DBFC at room temperature. Notably, the Co-B/NF anode enabled a maximum power density of 213.66 mW∙cm<sup>−2</sup>, rivaling or exceeding the values achieved by precious metal catalysts, which strongly demonstrates its substantial potential as a cost-effective anode material for DBFCs.</p>

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Synthesis of amorphous cobalt-boron catalyst and its catalytic performance for the oxidation of BH4−

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Yuxin Li,
  • Xiao Tian,
  • Mingyue Ji,
  • Yuanyuan Gao,
  • Mohan Li,
  • Yuanmeng Li

摘要

Amorphous Co-B powder was synthesized via a finely-controlled chemical reduction of cobalt chloride with potassium borohydride in aqueous solution. The microstructure and morphology of the product were analyzed using X-ray diffraction, Scanning Electron Microscope/ Energy Dispersive Spectrometer, transmission electron microscope/ selected area electron diffraction, differential scanning calorimetry, and X-ray photoelectron spectroscopy. The electrocatalytic activity of the Co-B catalyst towards the borohydride oxidation reaction (BOR) was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, chronoamperometry, chronopotentiometry, and electrochemical active surface area measurements. Research has shown that Co-B is an amorphous solid particle that exhibits excellent electrocatalytic activity and stability toward borohydride due to its unique three-dimensional structure, in which a moderate number of spherical particles are stacked on top of one another. It is evident that Co-B sample can serve as an anode catalyst for direct boron–hydrogen fuel cells (DBFCs). The practical performance of the Co-B catalyst was assessed in a DBFC at room temperature. Notably, the Co-B/NF anode enabled a maximum power density of 213.66 mW∙cm−2, rivaling or exceeding the values achieved by precious metal catalysts, which strongly demonstrates its substantial potential as a cost-effective anode material for DBFCs.