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<p>Due to its layered structure and appropriate electronic configuration, two-dimensional MoS<sub>2</sub> has been considered a reliable and inexpensive electrocatalyst and electrode material for the oxygen reduction reaction (ORR). Additionally, the MoS<sub>2</sub> and reduced graphene oxide (rGO) structure can act as a good host for other nano-catalysts. However, the catalytic activity of pristine MoS<sub>2</sub> is not as effective as the industrial targeted values. In this work, nickel-MoS<sub>2</sub> (Ni/MoS<sub>2</sub>) and Ni/MoS<sub>2</sub>-rGO composites are synthesized and evaluated as catalysts for ORR at the cathode. Electrochemical studies using a rotating disk electrode system confirmed that the as-synthesized catalyst exhibits good electrocatalytic activity to ORR in alkaline media (0.1&#xa0;M KOH) and followed the desirable 4-electron transfer process. Ni/MoS<sub>2</sub>-rGO composite displays a current density of − 11.1&#xa0;mA/cm<sup>2</sup> and half-wave and onset potentials of 0.74&#xa0;V and 0.87&#xa0;V, respectively, at 2400&#xa0;rpm, whereas the bare MoS<sub>2</sub> shows the values of limiting current density, half-wave potential, and onset potential of − 5.8&#xa0;mA/cm<sup>2</sup>, 0.61&#xa0;V, and 0.79&#xa0;V, respectively. Numerous highly active Mo sites, high conductivity, and high specific surface area in MoS<sub>2</sub>-rGO make it a novel catalyst material for ORR. Ni further enhances conductivity and is involved in electrochemical reactions. The onset potential slightly shifts towards the lower value after the potential cycling, whereas the limiting current density decreases by ≈9.0% for Ni/MoS<sub>2</sub>-rGO, which shows its good stability in alkaline media. Therefore, Ni/MoS<sub>2</sub>-rGO composite can be a good candidate for electrode catalyst material for alkaline fuel cells.</p> Graphical Abstract <p></p>

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Enhancement in ORR Performance by Compositing Ni-Decorated MoS2 with rGO for Alkaline Fuel Cells

  • 期刊论文

  • 发表日期：

    2025年1月4日

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  • Monika Shrivastav,
  • Harshit Galriya,
  • Ripsa Rani Nayak,
  • Navneet Kumar Gupta,
  • Mukesh Kumar,
  • Rajnish Dhiman

摘要

Due to its layered structure and appropriate electronic configuration, two-dimensional MoS2 has been considered a reliable and inexpensive electrocatalyst and electrode material for the oxygen reduction reaction (ORR). Additionally, the MoS2 and reduced graphene oxide (rGO) structure can act as a good host for other nano-catalysts. However, the catalytic activity of pristine MoS2 is not as effective as the industrial targeted values. In this work, nickel-MoS2 (Ni/MoS2) and Ni/MoS2-rGO composites are synthesized and evaluated as catalysts for ORR at the cathode. Electrochemical studies using a rotating disk electrode system confirmed that the as-synthesized catalyst exhibits good electrocatalytic activity to ORR in alkaline media (0.1 M KOH) and followed the desirable 4-electron transfer process. Ni/MoS2-rGO composite displays a current density of − 11.1 mA/cm2 and half-wave and onset potentials of 0.74 V and 0.87 V, respectively, at 2400 rpm, whereas the bare MoS2 shows the values of limiting current density, half-wave potential, and onset potential of − 5.8 mA/cm2, 0.61 V, and 0.79 V, respectively. Numerous highly active Mo sites, high conductivity, and high specific surface area in MoS2-rGO make it a novel catalyst material for ORR. Ni further enhances conductivity and is involved in electrochemical reactions. The onset potential slightly shifts towards the lower value after the potential cycling, whereas the limiting current density decreases by ≈9.0% for Ni/MoS2-rGO, which shows its good stability in alkaline media. Therefore, Ni/MoS2-rGO composite can be a good candidate for electrode catalyst material for alkaline fuel cells.

Graphical Abstract