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<p>Exploring advanced electrocatalysts for overall water splitting is of great significance to produce large-scale, green hydrogen. In this work, Sn(MoO<sub>4</sub>)<sub>2</sub> modified SnCo<sub>2</sub>O<sub>4</sub> is fabricated via a facile two-step hydrothermal synthesis method. Structural and morphological characterization by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), and X-ray photon spectroscopy (XPS) confirms the presence of both phases in the nanocomposite. In alkaline (1&#xa0;M KOH) electrolytes, SnCo<sub>2</sub>O<sub>4</sub>/Sn(MoO<sub>4</sub>)<sub>2</sub> exhibits superior electrocatalytic activities and stabilities, requiring overpotentials of 399&#xa0;mV for the oxygen evolution reaction (OER) and 357&#xa0;mV for the hydrogen evolution reaction (HER) to achieve a current density of 50&#xa0;mA&#xa0;cm<sup>−2</sup>. The reactions follow fast kinetics, as confirmed by the Tafel slopes of 69&#xa0;mV&#xa0;dec<sup>−1</sup> (for OER) and 130&#xa0;mV&#xa0;dec<sup>−1</sup> (for HER). Overall water splitting performed using a two-electrode system reveals that the catalyst requires a potential of 1.69&#xa0;V to sustain a current density of 10&#xa0;mA&#xa0;cm<sup>−2</sup> for 24&#xa0;h. Further, stability test in simulated seawater at 50&#xa0;mA&#xa0;cm<sup>−2</sup> for 48&#xa0;h reveals marginal increase in potential. These findings highlight SnCo<sub>2</sub>O<sub>4</sub>/Sn(MoO<sub>4</sub>)<sub>2</sub> as a promising and durable electrocatalyst for clean energy applications.</p>

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Superior electrochemical performance of SnCo2O4/Sn(MoO4)2 for OER and HER via overall electrocatalytic water splitting

  • 期刊论文

  • 发表日期：

    2026年4月12日

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  • Shivangini Singh,
  • Pragya,
  • Naveen Kumar Veldurthi,
  • Sudhanshu Pati

摘要

Exploring advanced electrocatalysts for overall water splitting is of great significance to produce large-scale, green hydrogen. In this work, Sn(MoO4)2 modified SnCo2O4 is fabricated via a facile two-step hydrothermal synthesis method. Structural and morphological characterization by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FE-SEM), and X-ray photon spectroscopy (XPS) confirms the presence of both phases in the nanocomposite. In alkaline (1 M KOH) electrolytes, SnCo2O4/Sn(MoO4)2 exhibits superior electrocatalytic activities and stabilities, requiring overpotentials of 399 mV for the oxygen evolution reaction (OER) and 357 mV for the hydrogen evolution reaction (HER) to achieve a current density of 50 mA cm−2. The reactions follow fast kinetics, as confirmed by the Tafel slopes of 69 mV dec−1 (for OER) and 130 mV dec−1 (for HER). Overall water splitting performed using a two-electrode system reveals that the catalyst requires a potential of 1.69 V to sustain a current density of 10 mA cm−2 for 24 h. Further, stability test in simulated seawater at 50 mA cm−2 for 48 h reveals marginal increase in potential. These findings highlight SnCo2O4/Sn(MoO4)2 as a promising and durable electrocatalyst for clean energy applications.