Abstract
The effect of reductive treatment on the phase composition, morphology, and electrochemical parameters of δ-MnO2 produced by the hydrothermal method from KMnO4 at a temperature of 160°C in the presence of HNO3 was studied. δ-MnO2 processing with 3 M NaBH4 aqueous solution leads to partial reduction of Mn(IV) to Mn(III) and Mn(II). The electrochemical characteristics of the obtained electrode materials were examined by cyclic voltammetry, galvanostatic charge–discharge measurements, and impedance spectroscopy. Reductive treatment increases the specific capacitance of δ-MnO2 in 1 M Na2SO4 up to 204 F g–1 at a current density of 0.1 A g–1, and also reduces diffusion limitations during cycling due to an increase in the specific surface area. The loss of specific capacitance after 2000 charge–discharge cycles does not exceed 2.6%, which confirms the high electrochemical stability of the obtained electrode materials.
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ACKNOWLEDGMENTS
The work was supported by the Russian Science Foundation (project no. 21-43-00023). The authors acknowledge support from the Lomonosov Moscow State University Program of Development for providing access to the XPS and TEM facilities.The authors thank D.N. Stolbov for the study of materials by scanning electron microscopy.
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E.A. Arkhipova: conducting electrochemical studies, analysis and processing of experimental data; A.S. Ivanov: conducting electrochemical studies; S.K. Nikolenko: hydrothermal synthesis, reduction modification of materials; K.I. Maslakov: X-ray photoelectron spectroscopy studies and interpretation of experimental data; S.V. Savilov: analysis of materials by X-ray phase analysis and processing of experimental data; S.M. Aldoshin: the concept of work, the formulation of the goals of the study, the selection of experimental conditions.
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Translated from Zhurnal Prikladnoi Khimii, No. 1, pp. 4–11, August, 2023 https://doi.org/10.31857/S0044461823010012
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Arkhipova, E.A., Ivanov, A.S., Nikolenko, S.K. et al. Reductive Treatment of δ-MnO2 with Sodium Borohydride: Method for Increasing the Electrode Material Capacitance. Russ J Appl Chem 96, 1–7 (2023). https://doi.org/10.1134/S1070427223010019
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DOI: https://doi.org/10.1134/S1070427223010019