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Vol. 38 No. 10 (2026): Vol 38, Issue 10, 2026

Copyright (c) 2026 David Amal Raj S

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Hydrothermal Synthesis of Chromium(II) Sulphate Doped Cuprous(I) Oxide of Optical Applications

https://doi.org/10.14233/ajchem.2026.36549
Savarimuthu David Amal Raj
Chemistry Research Laboratory, P.G. & Research Department of Chemistry, St. Joseph’s College of Arts & Science (Autonomous), Cuddalore-607001, India
https://orcid.org/0000-0002-6083-3907
Anand Gaspar
Chemistry Research Laboratory, P.G. & Research Department of Chemistry, St. Joseph’s College of Arts & Science (Autonomous), Cuddalore-607001, India
https://orcid.org/0000-0001-5335-8047
A. Amalorpavadoss
Chemistry Research Laboratory, P.G. & Research Department of Chemistry, St. Joseph’s College of Arts & Science (Autonomous), Cuddalore-607001, India
https://orcid.org/0000-0002-8022-333X
D. Bhakiaraj
Chemistry Research Laboratory, P.G. & Research Department of Chemistry, St. Joseph’s College of Arts & Science (Autonomous), Cuddalore-607001, India
https://orcid.org/0000-0002-9563-9573
S. Charles Edison
Chemistry Research Laboratory, P.G. & Research Department of Chemistry, St. Joseph’s College of Arts & Science (Autonomous), Cuddalore-607001, India
https://orcid.org/0009-0003-6654-5628

Corresponding Author(s) : D. Bhakiaraj

dbhakiaraj@gmail.com

Asian Journal of Chemistry, Vol. 38 No. 10 (2026): Vol 38, Issue 10, 2026

Abstract

Chromium(II) sulphate (CrSO4)-doped Cu2O nanocomposites were synthesized through a simple, low-cost chemical method using CrSO4 as a dopant to modify the structural, optical and electrochemical properties of Cu2O. Four synthesis approaches were employed and the resulting materials were characterized with respect to morphology, particle size, crystal structure, optical absorption and electrochemical behavior. UV-Vis spectroscopy revealed a shift in the absorption edge after chromium incorporation, with the corresponding change in optical band gap suggesting modification of the electronic structure of Cu2O. FTIR spectra exhibited the characteristic Cu–O vibrational band together with additional bands associated with interactions involving the dopant species, supporting the incorporation of Cr into the Cu2O matrix. XRD patterns exhibited the characteristic reflections of cubic Cu2O. Small changes in peak positions after Cr doping were consistent with lattice distortion caused by Cr-ion incorporation, while the cubic crystal structure was retained. SEM analysis revealed predominantly quasi-spherical particles with limited agglomeration and particle-size analysis placed the materials within the nanoscale range. Electrochemical measurements by cyclic voltammetry showed enhanced redox activity and improved charge-storage characteristics for the CrSO4-doped Cu2O samples compared with undoped Cu2O. Galvanostatic charge–discharge measurements yielded higher specific capacitance for the doped materials, together with improved cyclic reversibility and good cycling stability. These electrochemical characteristics support the potential application of CrSO4-doped Cu2O nanocomposites as electrode materials for energy-storage systems. XPS analysis further established the elemental composition and chemical states of the synthesized CrSO4-doped Cu2O nanoparticles. The combined structural, optical and electrochemical results demonstrate that controlled Cr incorporation can modify the physico-chemical properties of Cu2O while preserving its cubic framework.

Keywords

Cyclic voltammetry Cubic crystalline structure Galvanostatic charge-discharge curves
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Amal Raj, S. D.; Gaspar, A.; Amalorpavadoss, A.; Bhakiaraj, D.; Edison, S. C. Hydrothermal Synthesis of Chromium(II) Sulphate Doped Cuprous(I) Oxide of Optical Applications. ajc 2026, 38, 2675-2682.
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