Influence of Precursor Molar Concentration on the Morphology and Electrochemical Performance of Tin oxide Nanoparticles
J. Environ. Nanotechnol., Volume 15, No 1 (March 2026) pp. 692-700
Abstract
Despite extensive studies on Tin oxide nanoparticles for energy storage applications, the role of precursor molar concentration as a simple and scalable parameter to simultaneously tune morphology, electronic structure, and electrochemical performance remains insufficiently explored. In this work, Tin oxide nanoparticles were synthesized via a co-precipitation method using precursor concentrations of 0.3, 0.4, and 0.5 M to systematically investigate this relationship. The results reveal that increasing molar concentration leads to a significant growth in crystallite size from ~5 nm to ~15 nm, accompanied by a reduction in optical band gap from 2.92 eV to 2.70 eV, indicating enhanced defect states and improved charge transport properties. Morphological evolution from relatively smaller particles to agglomerated secondary nanostructures at higher concentrations provides improved interparticle connectivity, which is beneficial for electrochemical applications. Electrochemical analysis demonstrates that all samples exhibit electrical double-layer capacitive behaviour with good reversibility. Notably, the 0.5 M sample delivers a maximum specific capacitance of 131 Fg-1 (CV) and 26 Fg-1 (GCD), compared to 79 Fg-1 and 14 Fg-1 for the 0.3 M sample. The enhanced performance is attributed to the combined effect of increased crystallite size, reduced band gap, and favorable morphological features facilitating efficient ion diffusion and electron transport. This study establishes a direct correlation between precursor molar concentration and the resulting physicochemical and electrochemical properties of SnO2 nanoparticles, demonstrating a simple yet effective strategy for optimizing electrode materials for high-performance supercapacitor applications.
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Reference
Bard, A. J. and Faulkner, L. R., Electrochemical methods: Fundamentals and applications, 2nd Ed., Wiley, New York, 864(2011).
Barsoukov, E. and Macdonald, J. R., Impedance spectroscopy: Theory, experiment, and applications, Wiley, New Jersey, 517-528(2005).
Batzill, M. and Diebold, U., The surface and materials science of tin oxide, Prog. Surf. Sci., 79(2–4), 47–154 (2005).
https://doi.org/10.1016/j.progsurf.2005.09.002
Cao G. and Wang Y., Nanostructures and nanomaterials: Synthesis, properties and applications, World Scientific, 596(2011).
Chen, X. and Mao, S. S., Titanium dioxide nanomaterials: Synthesis, properties, modifications, and applications, Chem. Rev., 107(7), 2891–2959 (2007).
https://doi.org/10.1021/cr0500535
Comini, E., Faglia G., Sberveglieri G., Baratto, C., Ferroni, M. and Vomiero, A., Quasi-one-dimensional metal oxide semiconductors: Preparation, characterization and application as chemical sensors, Prog. Mater. Sci., 54(1), 1–67 (2009).
https://doi.org/10.1016/j.pmatsci.2008.06.003
Conway, B. E., Electrochemical supercapacitors: Scientific fundamentals and technological applications, Springer, New York, 698(1999).
https://doi.org/10.1007/978-1-4757-3058-6
Cullity, B. D. and Stock, S. R., Elements of X-ray diffraction, 3rd Ed., Prentice Hall, New Jersey (2001).
Cullity, B. D., Elements of X-ray diffraction, Addison-Wesley, Massachusetts, 95(1978).
Davis, E. A. and Mott, N. F., Conduction in non-crystalline systems, Philos. Mag., 22(179), 903–922 (1970).
https://doi.org/10.1080/14786437008221061
Dubal, D. P., Ayyad, O., Ruiz, V. and Gómez-Romero, P., Hybrid energy storage: The merging of battery and supercapacitor chemistries, Chem. Soc. Rev., 44(7), 1777–1790 (2015).
https://doi.org/10.1039/C4CS00266K
Frackowiak, E. abd Béguin F., Carbon materials for electrochemical energy storage of energy in capacitors, Carbon, 39(6), 937–950 (2001).
https://doi.org/10.1016/S0008-6223(00)00183-4
Gautam, N. K., Sharma, A., Varshney, M., Singh, J. P., Shin, H. J., Kumar, S., Brajpuriya, R., Lee, B., Chae, K. H. and Won S. O., SnO₂/Na–SnO₂@MXene hybrid electrode materials for supercapacitor applications, New J. Chem., 49, 11203–11217 (2025).
https://doi.org/10.1039/D5NJ00196J
Goldstein, J. I., Newbury, D. E., Joy, D. C., Lyman, C. E., Lifshin, E., Sawyer L., Michael J.R., Scanning electron microscopy and X-ray microanalysis, Springer New York, 550(2003).
Gurlo A., Nanosensors: Towards morphological control of gas sensing activity, Nanoscale, 3(1), 154–165 (2011).
https://doi.org/10.1039/C0NR00441C
Kılıç, Ç. and Zunger, A., Origins of coexistence of conductivity and transparency in SnO₂, Phys. Rev. Lett., 88(9), 095501 (2002).
https://doi.org/10.1103/PhysRevLett.88.095501
Klug H. P. and Alexander L. E., X-ray diffraction procedures for polycrystalline materials, Wiley, (1974).
Liu, C., Li, F., Ma, L. P. and Cheng, H. M., Advanced materials for energy storage, Adv. Mater., 22(8), E28–E62 (2010).
https://doi.org/10.1002/adma.200903328
Liu, L., An, M., Yang, P. and Zhang, J., Superior cycle performance and high reversible capacity of SnO₂/graphene composite as an anode material, Sci. Rep., 5, 9055 (2015).
https://doi.org/10.1038/srep09055
Lou, X. W., Archer, L. A. and Yang Z., Hollow micro/nanostructures: Synthesis and applications, Adv. Mater., 20(21), 3987–4019 (2008).
https://doi.org/10.1002/adma.200800854
Miller, J. R. and Simon, P., Electrochemical capacitors for energy management, Sci., 321(5889), 651–652 (2008).
https://doi.org/10.1126/science.1158736
Nakamoto, K., Infrared and Raman spectra of inorganic and coordination compounds, Wiley, New York, 415-419(2009).
Patterson, A. L., The Scherrer formula for X-ray particle size determination, Phys. Rev., 56(10), 978–982 (1939).
https://doi.org/10.1103/PhysRev.56.978
Ramesh, S., Yadav, H. M., Lee, Y. J., Hong, G. W., Kathalingam, A., Sivasamy, A., Kim, H. S., Kim, H. S. and Kim, J. H., Porous nitrogen-doped graphene oxide/SnO₂ composite for supercapacitor applications, Sci. Rep., 9, 12622 (2019).
https://doi.org/10.1038/s41598-019-48951-2
Simon P. and Gogotsi Y., Materials for electrochemical capacitors, Nat. Mater., 7(11), 845–854 (2008).
https://doi.org/10.1038/nmat2297
Socrates G., Infrared and Raman characteristic group frequencies, Sci., 368(2004).
Tauc, J., Optical properties and electronic structure of amorphous semiconductors, Mater. Res. Bull., 3(1), 37–46 (1968).
https://doi.org/10.1016/0025-5408(68)90023-8
Trasatti, S. and Buzzanca. G., Ruthenium dioxide: A new interesting electrode material, J. Electroanal. Chem. Interf. Electrochem., 29(2), A1–A5 (1971).
https://doi.org/10.1016/S0022-0728(71)80111-0
Vandana, M., Nagaraju, Y. S., Ganesh, H., Veeresh S., Vijeth H., Basappa, M. and Devendrappa, H., A SnO₂ quantum dots/GO/PPY ternary composite film as positive electrode for solid-state asymmetric supercapacitor, RSC Adv., 11, 27801–27811 (2021).
https://doi.org/10.1039/D1RA03423E
Wang, W., Hao, Q., Lei, W., Xia, X. and Wang, X., Graphene/SnO₂/polypyrrole ternary nanocomposites as supercapacitor electrode materials, RSC Adv., 2, 10268–10274 (2012).
https://doi.org/10.1039/C2RA21292G
Wang, Y. and Xia, Y., Recent progress in supercapacitors: From materials design to system construction, Adv. Mater., 25(37), 5336–5342 (2013).
https://doi.org/10.1002/adma.201301532
Wang, Z. L., Zinc oxide nanostructures: Growth, properties and applications, J. Phys.: Condens. Matter, 16(25), R829–R858 (2004).
https://doi.org/10.1088/0953-8984/16/25/R01
Winter, M. and Brodd, R. J., What are batteries, fuel cells, and supercapacitors?, Chem. Rev., 104(10), 4245–4269 (2004).
https://doi.org/10.1021/cr020730k
Zhang, H., Chen, G. and Bahnemann, D.W., Visible-light photocatalytic materials: From synthesis to applications, J. Mater. Chem., 19(28), 5089–5121 (2009).
https://doi.org/10.1039/B821991E
Zhang, J., Liu, X., Neri, G. and Pinna N., Nanostructured materials for room-temperature gas sensors, Adv. Mater., 28(5), 795–831 (2016).
https://doi.org/10.1002/adma.201503825
Zhang, L. L. and Zhao, X. S., Carbon-based materials for supercapacitors, Chem. Soc. Rev., 38(9), 2520–2531 (2009).
