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<p>Nanocrystalline spinel-structured CuAl<sub>2</sub>O<sub>4</sub> was synthesized using a solution combustion method. This method is simple, chief, and environmentally friendly for synthesizing high-quality nanomaterials. The inorganic reagents, aluminum nitrate nonahydrate [Al(NO<sub>3</sub>)<sub>3</sub>.9H<sub>2</sub>O], copper nitrate hexahydrate [Cu(NO<sub>3</sub>)<sub>3</sub>.6H<sub>2</sub>O], and glycine, as a fuel are used for the synthesis of CuAl<sub>2</sub>O<sub>4</sub>. The effects of 800&#xa0;°C calcination temperature on the synthesized CuAl<sub>2</sub>O<sub>4</sub> materials have been studied in detail. The structural, morphological, and compositional properties were examined using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) equipped with EDAX, and Transmission Electron Microscopy (TEM). The optical, magnetic, and electrical properties of the synthesized CuAl<sub>2</sub>O<sub>4</sub> material were confirmed by UV–visible Spectroscopy, Vibrating Sample Magnetometer (VSM), and I–V measurements. Thermal analysis and bonding configuration were confirmed using Thermogravimetric-Differential Thermal Analysis (TG–DTA) and FTIR Spectroscopy. The gas-sensing response of the synthesized CuAl<sub>2</sub>O<sub>4</sub> material was checked with various gases like ammonia, ethanol, formaldehyde, acetone, toluene, and carbon dioxide. It was observed that the synthesized CuAl<sub>2</sub>O<sub>4</sub> material responds differently to different gases and at different temperatures. The synthesized CuAl<sub>2</sub>O<sub>4</sub>exhibits rapid response and recovery ability for ammonia gas. Thus, CuAl<sub>2</sub>O<sub>4</sub> has great potential for ammonia gas sensing with high sensitivity and good selectivity. The synthesized material is also tested for electrochemical performance, and it was estimated through galvanostatic charge–discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) in KOH electrolyte. The specific capacitance (CS) of the CuAl<sub>2</sub>O<sub>4</sub> powder electrode was measured with the three-electrode method, confirming the maximum CS of 492.6 F/g at a scan rate of 5 mVs<sup>−1</sup>. The calculated value of energy density and power density of the CuAl<sub>2</sub>O<sub>4</sub> powder electrode is 5.5954 WhKg<sup>−1</sup> and 598.32 Wkg<sup>−1</sup>, respectively.</p>

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Gas-sensing and supercapacitor performance of nanocrystalline spinel-structured CuAl2O4 synthesized by solution combustion method

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • R. D. Prakshale,
  • S. V. Bangale,
  • M. M. Kamble,
  • S. B. Sonawale

摘要

Nanocrystalline spinel-structured CuAl2O4 was synthesized using a solution combustion method. This method is simple, chief, and environmentally friendly for synthesizing high-quality nanomaterials. The inorganic reagents, aluminum nitrate nonahydrate [Al(NO3)3.9H2O], copper nitrate hexahydrate [Cu(NO3)3.6H2O], and glycine, as a fuel are used for the synthesis of CuAl2O4. The effects of 800 °C calcination temperature on the synthesized CuAl2O4 materials have been studied in detail. The structural, morphological, and compositional properties were examined using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) equipped with EDAX, and Transmission Electron Microscopy (TEM). The optical, magnetic, and electrical properties of the synthesized CuAl2O4 material were confirmed by UV–visible Spectroscopy, Vibrating Sample Magnetometer (VSM), and I–V measurements. Thermal analysis and bonding configuration were confirmed using Thermogravimetric-Differential Thermal Analysis (TG–DTA) and FTIR Spectroscopy. The gas-sensing response of the synthesized CuAl2O4 material was checked with various gases like ammonia, ethanol, formaldehyde, acetone, toluene, and carbon dioxide. It was observed that the synthesized CuAl2O4 material responds differently to different gases and at different temperatures. The synthesized CuAl2O4exhibits rapid response and recovery ability for ammonia gas. Thus, CuAl2O4 has great potential for ammonia gas sensing with high sensitivity and good selectivity. The synthesized material is also tested for electrochemical performance, and it was estimated through galvanostatic charge–discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) in KOH electrolyte. The specific capacitance (CS) of the CuAl2O4 powder electrode was measured with the three-electrode method, confirming the maximum CS of 492.6 F/g at a scan rate of 5 mVs−1. The calculated value of energy density and power density of the CuAl2O4 powder electrode is 5.5954 WhKg−1 and 598.32 Wkg−1, respectively.