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<p>The development of the economical and durable catalysts of water-splitting catalysts is still a great challenge, especially in HER and OER. WS<sub>2</sub>/CaSiO<sub>3</sub> (1, 5, 10 wt%) composites were prepared via ball milling processing, and then uniformly dispersed by ultransonic treatment in water-ethanol and thermal drying at 150&#xa0;°C. The selection of WS<sub>2</sub>/CaSiO<sub>3</sub> was due to the high catalytic activity of WS<sub>2</sub> and the stability, perfect dispersibility, low cost and durability of CaSiO<sub>3</sub>. They synergistically form an interface to facilitate charge transfer and the overall electrocatalytic performance. Among the prepared samples, the 1 wt% WS<sub>2</sub>/CaSiO<sub>3</sub> electrocatalyst showed the highest performance with the current density at 1.66&#xa0;V of 10&#xa0;mA cm<sup>−2</sup> and the durability test at 160&#xa0;mA cm<sup>−2</sup> for 50&#xa0;h. The low Tafel slope of 33.6 mV dec<sup>−1</sup> shows faster charge-transfer kinetics. The electrochemical surface area of 14.7 mF cm<sup>−2</sup> is greater than that of other samples. Together, these features highlight the unique balance of activity and available active sites in the 1% WS<sub>2</sub>/CaSiO<sub>3</sub> catalyst. The high activity of the 1 wt% WS<sub>2</sub>/CaSiO<sub>3</sub> sample comes from its confined WS<sub>2</sub> nanosheets, enriched W(IV) species, and better electronic conductivity, as shown by XRD, HRTEM, FTIR, and XPS. This structure supports quick water adsorption while preventing the over-oxidation that occurs at higher loadings. Consequently, the composite acts as an effective bifunctional catalyst, improving both HER and OER at the same time.</p>

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Innovative Electrocatalytic Water Splitting Utilizing WS2 and Calcium Silicate Composite for Enhanced Hydrogen Production

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Enas E. Abdelmonem,
  • M. Khairy,
  • Mohamed Mokhtar Mohamed

摘要

The development of the economical and durable catalysts of water-splitting catalysts is still a great challenge, especially in HER and OER. WS2/CaSiO3 (1, 5, 10 wt%) composites were prepared via ball milling processing, and then uniformly dispersed by ultransonic treatment in water-ethanol and thermal drying at 150 °C. The selection of WS2/CaSiO3 was due to the high catalytic activity of WS2 and the stability, perfect dispersibility, low cost and durability of CaSiO3. They synergistically form an interface to facilitate charge transfer and the overall electrocatalytic performance. Among the prepared samples, the 1 wt% WS2/CaSiO3 electrocatalyst showed the highest performance with the current density at 1.66 V of 10 mA cm−2 and the durability test at 160 mA cm−2 for 50 h. The low Tafel slope of 33.6 mV dec−1 shows faster charge-transfer kinetics. The electrochemical surface area of 14.7 mF cm−2 is greater than that of other samples. Together, these features highlight the unique balance of activity and available active sites in the 1% WS2/CaSiO3 catalyst. The high activity of the 1 wt% WS2/CaSiO3 sample comes from its confined WS2 nanosheets, enriched W(IV) species, and better electronic conductivity, as shown by XRD, HRTEM, FTIR, and XPS. This structure supports quick water adsorption while preventing the over-oxidation that occurs at higher loadings. Consequently, the composite acts as an effective bifunctional catalyst, improving both HER and OER at the same time.