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<p>The increasing global demand for energy and the environmental impact associated with fossil fuel consumption highlight the need for efficient electrochemical energy storage systems. In this work, a reduced graphene oxide/lanthanum hexacyanoferrate (rGO/LaHCF) nanocomposite thin film is synthesized through a single-step electrochemical deposition method. The films are characterized using electrochemical, spectroscopic, and microscopic techniques. Cyclic voltammetry reveals enhanced charge storage behavior at pH = 2.0, displaying a pseudocapacitive profile. Scanning electron microscopy shows rGO sheets coating LaHCF particles, while energy-dispersive X-ray spectroscopy confirms the expected elemental composition. Raman and FTIR analyses identify the characteristic D and G bands of rGO and the vibrational modes associated with the cyanide group of the hexacyanoferrate framework. Electrochemical measurements demonstrate specific capacitances of 81 and 26&#xa0;F g<sup>− 1</sup> at current densities of 0.5 and 10&#xa0;A g<sup>− 1</sup>, respectively. Galvanostatic charge–discharge tests reveal an average coulombic efficiency of 102.8%, indicating good reversibility. During long-term cycling, the specific capacitance initially decreases within the first 180 cycles and subsequently increases, reaching approximately 110% of its initial value after 2,000 cycles. These results demonstrate that the rGO/LaHCF nanocomposite is a promising electrode material for supercapacitor applications.</p> Graphical abstract <p></p>

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Charge storage evaluation of reduced graphene oxide/lanthanum Prussian blue analogue thin film

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月10日

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  • Rodrigo M. Alves,
  • Pedro H. S. Borges,
  • Edson Nossol

摘要

The increasing global demand for energy and the environmental impact associated with fossil fuel consumption highlight the need for efficient electrochemical energy storage systems. In this work, a reduced graphene oxide/lanthanum hexacyanoferrate (rGO/LaHCF) nanocomposite thin film is synthesized through a single-step electrochemical deposition method. The films are characterized using electrochemical, spectroscopic, and microscopic techniques. Cyclic voltammetry reveals enhanced charge storage behavior at pH = 2.0, displaying a pseudocapacitive profile. Scanning electron microscopy shows rGO sheets coating LaHCF particles, while energy-dispersive X-ray spectroscopy confirms the expected elemental composition. Raman and FTIR analyses identify the characteristic D and G bands of rGO and the vibrational modes associated with the cyanide group of the hexacyanoferrate framework. Electrochemical measurements demonstrate specific capacitances of 81 and 26 F g− 1 at current densities of 0.5 and 10 A g− 1, respectively. Galvanostatic charge–discharge tests reveal an average coulombic efficiency of 102.8%, indicating good reversibility. During long-term cycling, the specific capacitance initially decreases within the first 180 cycles and subsequently increases, reaching approximately 110% of its initial value after 2,000 cycles. These results demonstrate that the rGO/LaHCF nanocomposite is a promising electrode material for supercapacitor applications.

Graphical abstract