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<p>Transition metal dichalcogenides (M = Mo, W, Re) have gained significant attention for electrocatalytic applications in renewable energy due to their unique layered structures. However, their catalytic activity is often limited by the inert nature of basal planes, with active sites primarily located along the edges. In this study, we employed doping as a strategy to enhance the catalytic performance of Re<sub>(1−<i>x</i>)</sub>W<sub><i>x</i></sub>S<sub>2</sub> alloys by increasing the density of active sites. Using Re<sub>2</sub>(<i>µ</i>-S)<sub>2</sub>(S<sub>2</sub>CNEt<sub>2</sub>)<sub>4</sub> (1) and WS<sub>3</sub>(S<sub>2</sub>CNEt<sub>2</sub>)<sub>2</sub> (2) as precursors, thin films were synthesized via aerosol-assisted chemical vapor deposition at 500&#xa0;°C. Comprehensive characterization using powder X-ray diffraction, Raman spectroscopy, inductively coupled plasma optical emission spectroscopy, scanning electron microscopy, energy-dispersive&#xa0;X-ray spectroscopy, and transmission electron microscopy (TEM) confirmed the successful formation of Re<sub>(1−<i>x</i>)</sub>W<sub><i>x</i></sub>S<sub>2</sub> alloys. TEM analysis revealed a phase transition from 1T to 2H at W concentrations between 22.6 and 30.8%, indicating a structural evolution from the ReS<sub>2</sub> (1T) to WS<sub>2</sub> (2H) phase. Catalytic testing of both bulk and exfoliated materials in hydrogen evolution demonstrated that doping-induced structural modifications led to a higher density of catalytically active sites, significantly enhancing performance. These findings underscore the role of doping in tailoring the electronic and structural properties of TMDCs to optimize their catalytic efficiency, paving the way for their broader application in sustainable energy technologies.</p>

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Optimizing catalytic performance of ReS2 thin films: development of Re(1−x)WxS2 alloys for enhanced hydrogen evolution via aerosol-assisted CVD

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Naktal Al-Dulaimi,
  • Mundher Al-Shakban,
  • Inigo Yrezabal,
  • Andinet Ejigu

摘要

Transition metal dichalcogenides (M = Mo, W, Re) have gained significant attention for electrocatalytic applications in renewable energy due to their unique layered structures. However, their catalytic activity is often limited by the inert nature of basal planes, with active sites primarily located along the edges. In this study, we employed doping as a strategy to enhance the catalytic performance of Re(1−x)WxS2 alloys by increasing the density of active sites. Using Re2(µ-S)2(S2CNEt2)4 (1) and WS3(S2CNEt2)2 (2) as precursors, thin films were synthesized via aerosol-assisted chemical vapor deposition at 500 °C. Comprehensive characterization using powder X-ray diffraction, Raman spectroscopy, inductively coupled plasma optical emission spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy (TEM) confirmed the successful formation of Re(1−x)WxS2 alloys. TEM analysis revealed a phase transition from 1T to 2H at W concentrations between 22.6 and 30.8%, indicating a structural evolution from the ReS2 (1T) to WS2 (2H) phase. Catalytic testing of both bulk and exfoliated materials in hydrogen evolution demonstrated that doping-induced structural modifications led to a higher density of catalytically active sites, significantly enhancing performance. These findings underscore the role of doping in tailoring the electronic and structural properties of TMDCs to optimize their catalytic efficiency, paving the way for their broader application in sustainable energy technologies.