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<p>In this study, composite of Ni<sub>3</sub>S<sub>4</sub>/NiS<sub>2</sub> was synthesized using single-step hydrothermal route. A series of characterization like X-ray diffraction and Fourier transform infrared confirms the formation of heterostructure nickel sulfide which consists of NiS<sub>2</sub> and Ni<sub>3</sub>S<sub>4</sub> phase. Characteristics of mixed phase of Ni<sub>3</sub>S<sub>4</sub>/NiS<sub>2</sub> relationship have been examined by electrochemical test. Charge transfer resistance of the synthesized composite Ni<sub>3</sub>S<sub>4</sub>/NiS<sub>2</sub> is 15.79 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11696_2025_4334_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Omega\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Ω</mi> </math></EquationSource> </InlineEquation>. Areal and specific capacitance of prepared composite is 4.96 F/cm<sup>2</sup> and 545 F/g at 3&#xa0;mV/s, respectively, and it shows 89% cyclic stability over 1600 cycle at constant scan rate of 50&#xa0;mV/s. 1&#xa0;M LiOH aqueous solution used as electrolyte during the characterization of electrochemical test. Surface property of composite Ni<sub>3</sub>S<sub>4</sub>/NiS<sub>2</sub> has been examined by nitrogen isotherm, and pore size of the composite is 3.934&#xa0;nm which provides the effective path for electron transportation between the surface of working electrode and electrolyte. The calculated parameters of the series of characterization indicated that prepared composite of Ni<sub>3</sub>S<sub>4</sub>/NiS<sub>2</sub> is a potential electrode material for electrochemical devices.</p>

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Hydrothermally synthesized mixed phase of Ni3S4/NiS2 as an efficient electrode for electrochemical devices

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Rekha Bhardwaj,
  • Vanita Bhardwaj,
  • Ranjana Jha

摘要

In this study, composite of Ni3S4/NiS2 was synthesized using single-step hydrothermal route. A series of characterization like X-ray diffraction and Fourier transform infrared confirms the formation of heterostructure nickel sulfide which consists of NiS2 and Ni3S4 phase. Characteristics of mixed phase of Ni3S4/NiS2 relationship have been examined by electrochemical test. Charge transfer resistance of the synthesized composite Ni3S4/NiS2 is 15.79 \(\Omega\) Ω . Areal and specific capacitance of prepared composite is 4.96 F/cm2 and 545 F/g at 3 mV/s, respectively, and it shows 89% cyclic stability over 1600 cycle at constant scan rate of 50 mV/s. 1 M LiOH aqueous solution used as electrolyte during the characterization of electrochemical test. Surface property of composite Ni3S4/NiS2 has been examined by nitrogen isotherm, and pore size of the composite is 3.934 nm which provides the effective path for electron transportation between the surface of working electrode and electrolyte. The calculated parameters of the series of characterization indicated that prepared composite of Ni3S4/NiS2 is a potential electrode material for electrochemical devices.