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<p>MoO<sub>2</sub> is a promising material for efficient and cost-effective electrocatalytic water splitting, particularly for the oxygen evolution reaction (OER) in alkaline media. Modifying the morphology, composition, or oxidation state of MoO<sub>2</sub> can enhance its active surface area and performance. In this study, Mo-coated carbon paper was used as a substrate to synthesize well-organized MoO<sub>2</sub> nanowires and nanosheets via a one-step CVD method without any catalyst. The nanosheets and nanowires grow perpendicularly to the substrate. MoO<sub>2</sub> nanowire arrays exhibit superior OER performance, characterized by a lower onset potential (1.54&#xa0;V), a smaller Tafel slope, and enhanced durability compared to nanosheets. This improvement is likely attributed to the increased number of exposed active sites, reduced presence of oxidized Mo<sup>4+</sup>, and smaller crystalline size.</p> Graphical abstract <p>Here, well-organized MoO<sub>2</sub> nanowires and nanosheets have been fabricated on carbon paper using a one-step CVD method by reducing MoO<sub>3</sub> with Mo powder to investigate the intrinsic relationship between morphology, elemental composition and state, and their electrocatalytic properties. The obtained nanosheets presented as a flower-like structure, while nanowires formed into well-aligned arrays. MoO<sub>2</sub> nanowires contained higher amounts of Mo<sup>4+</sup>, were composed of smaller crystal grains, and possessed a lower onset potential for OER (oxygen evolution reaction) at about 1.54 V, a smaller Tafel slope at about 110 mV/dec, and better durability when compared to MoO<sub>2</sub> nanosheets.</p>

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Controlled growth of MoO2 nanowires and nanosheets by chemical vapor deposition: a comparative study of their electrochemical water splitting performance

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Kai Tang,
  • Siyuan Chen,
  • Xuchun Wang,
  • Xueru Zhang,
  • Yong Zhang,
  • Xiang Ke,
  • Xinru Xu,
  • Tao Wu,
  • Bingxin Wang,
  • Shasha Li

摘要

MoO2 is a promising material for efficient and cost-effective electrocatalytic water splitting, particularly for the oxygen evolution reaction (OER) in alkaline media. Modifying the morphology, composition, or oxidation state of MoO2 can enhance its active surface area and performance. In this study, Mo-coated carbon paper was used as a substrate to synthesize well-organized MoO2 nanowires and nanosheets via a one-step CVD method without any catalyst. The nanosheets and nanowires grow perpendicularly to the substrate. MoO2 nanowire arrays exhibit superior OER performance, characterized by a lower onset potential (1.54 V), a smaller Tafel slope, and enhanced durability compared to nanosheets. This improvement is likely attributed to the increased number of exposed active sites, reduced presence of oxidized Mo4+, and smaller crystalline size.

Graphical abstract

Here, well-organized MoO2 nanowires and nanosheets have been fabricated on carbon paper using a one-step CVD method by reducing MoO3 with Mo powder to investigate the intrinsic relationship between morphology, elemental composition and state, and their electrocatalytic properties. The obtained nanosheets presented as a flower-like structure, while nanowires formed into well-aligned arrays. MoO2 nanowires contained higher amounts of Mo4+, were composed of smaller crystal grains, and possessed a lower onset potential for OER (oxygen evolution reaction) at about 1.54 V, a smaller Tafel slope at about 110 mV/dec, and better durability when compared to MoO2 nanosheets.