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<p>In this study, a Sm-NiMoO<sub>4</sub>/CoMoO<sub>4</sub> composite was synthesized on nickel foam using co-precipitation followed by calcination. The introduction of samarium (Sm)-induced oxygen vacancies and increased the specific surface area to 129.8 m<sup>2</sup>/g, higher than that of NiMoO<sub>4</sub> (96.36 m<sup>2</sup>/g) and CoMoO<sub>4</sub> (99.72 m<sup>2</sup>/g). The composite showed a high specific capacitance of 1982 F g<sup>−1</sup> at 1 A g<sup>−1</sup> and excellent cycling stability, retaining 98.3% after 10,000 cycles. Additionally, a solid-state asymmetric supercapacitor was assembled using Sm-NiMoO<sub>4</sub>/CoMoO<sub>4</sub> as the positive electrode and carbon nanotubes (CNTs) as the negative electrode. The device operated within 0–1.6&#xa0;V and delivered a maximum energy density of 44.8 Wh kg<sup>−1</sup> and a power density of 9900 W kg<sup>−1</sup>, showing outstanding energy storage performance.</p>

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Samarium-doped NiMoO4-CoMoO4 composites with oxygen vacancies for high-performance supercapacitors

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Tenghao Ma,
  • An Li,
  • Jian Hao,
  • Tingting Hao,
  • Yingxu Wang,
  • Guanghui Yan,
  • Jing Wang

摘要

In this study, a Sm-NiMoO4/CoMoO4 composite was synthesized on nickel foam using co-precipitation followed by calcination. The introduction of samarium (Sm)-induced oxygen vacancies and increased the specific surface area to 129.8 m2/g, higher than that of NiMoO4 (96.36 m2/g) and CoMoO4 (99.72 m2/g). The composite showed a high specific capacitance of 1982 F g−1 at 1 A g−1 and excellent cycling stability, retaining 98.3% after 10,000 cycles. Additionally, a solid-state asymmetric supercapacitor was assembled using Sm-NiMoO4/CoMoO4 as the positive electrode and carbon nanotubes (CNTs) as the negative electrode. The device operated within 0–1.6 V and delivered a maximum energy density of 44.8 Wh kg−1 and a power density of 9900 W kg−1, showing outstanding energy storage performance.