Scholarlink

<p>The design of multifunctional, low-cost electrode materials using earth-abundant elements is vital for advancing clean energy technologies. In this work, a novel electrode material (NiSiO<sub>2</sub>/rGO/g-C<sub>3</sub>N<sub>4</sub>) was synthesized and thoroughly assessed for its electrochemical energy storage and hydrogen evolution performance. Nickel silicate (NiSiO<sub>2</sub>) was fabricated via a hydrothermal route. Reduced graphene oxide (rGO) was synthesized using the Hummers method, while graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) was obtained through thermal polymerization of melamine and urea. The components were physically integrated to form a composite with a porous nanoscale architecture and strong interfacial connectivity. Morphological and structural analyses confirmed the successful formation of a well-dispersed hybrid material. Electrochemical studies in a three-electrode setup revealed that the composite (NiSiO<sub>2</sub>/rGO/g-C<sub>3</sub>N<sub>4</sub>) achieved a high specific capacity (<i>Q</i><sub>s</sub>) of 1543.5 C g<sup>−1</sup> and a specific capacitance (<i>C</i><sub>s</sub>) of 2132.3&#xa0;F&#xa0;g<sup>−1</sup> at 3&#xa0;mVs<sup>−1</sup>. The assembled supercapattery, through a two-electrode assembly, delivered a notable energy density (<i>E</i><sub>d</sub>) of 75.6&#xa0;Wh/kg and a power density (<i>P</i><sub>d</sub>) of 1771.9&#xa0;W/kg, with capacitance retention of 86.9% after 10,000 continuous cycles, indicating excellent long-term stability. Furthermore, the material showed outstanding electrocatalytic activity toward the hydrogen evolution reaction (HER). It exhibited an overpotential of only 59&#xa0;mV at 9&#xa0;mA/cm<sup>2</sup> and a favorable Tafel slope of 82.1&#xa0;mV/dec. These results confirm the potential of NiSiO<sub>2</sub>/rGO/g-C<sub>3</sub>N<sub>4</sub> as an efficient, scalable, and multifunctional material capable of supporting both advanced energy storage and hydrogen generation applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mixed-Dimensional and Multifunctional NiSiO2/rGO/g-C3N4 Hybrid Electrode for Asymmetric Supercapacitors and Efficient Hydrogen Evolution

  • 期刊论文

  • 发表日期：

    2025年9月23日

查看全文
  • Muhammad Azhar Mumtaz,
  • Muneerah Alomar,
  • Mohammed Jalalah,
  • Amir Muhammad Afzal,
  • Sohail Mumtaz,
  • Muhammad Hamza Waris,
  • Farid A. Harraz

摘要

The design of multifunctional, low-cost electrode materials using earth-abundant elements is vital for advancing clean energy technologies. In this work, a novel electrode material (NiSiO2/rGO/g-C3N4) was synthesized and thoroughly assessed for its electrochemical energy storage and hydrogen evolution performance. Nickel silicate (NiSiO2) was fabricated via a hydrothermal route. Reduced graphene oxide (rGO) was synthesized using the Hummers method, while graphitic carbon nitride (g-C3N4) was obtained through thermal polymerization of melamine and urea. The components were physically integrated to form a composite with a porous nanoscale architecture and strong interfacial connectivity. Morphological and structural analyses confirmed the successful formation of a well-dispersed hybrid material. Electrochemical studies in a three-electrode setup revealed that the composite (NiSiO2/rGO/g-C3N4) achieved a high specific capacity (Qs) of 1543.5 C g−1 and a specific capacitance (Cs) of 2132.3 F g−1 at 3 mVs−1. The assembled supercapattery, through a two-electrode assembly, delivered a notable energy density (Ed) of 75.6 Wh/kg and a power density (Pd) of 1771.9 W/kg, with capacitance retention of 86.9% after 10,000 continuous cycles, indicating excellent long-term stability. Furthermore, the material showed outstanding electrocatalytic activity toward the hydrogen evolution reaction (HER). It exhibited an overpotential of only 59 mV at 9 mA/cm2 and a favorable Tafel slope of 82.1 mV/dec. These results confirm the potential of NiSiO2/rGO/g-C3N4 as an efficient, scalable, and multifunctional material capable of supporting both advanced energy storage and hydrogen generation applications.