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Titanium dioxide nanoparticles play a crucial role in the production of hydrogen gas evolution. Among the four polymorphic phases of TiO₂ (anatase, rutile, brookite, and TiO₂ (B)), the anatase phase shows good photo activity in catalytic applications. We prepared a single anatasephase of TiO₂ nanoparticles usinga facile one-step ionothermal method with the existence of 1-(3,6-dioxa heptane) 3-methyl imidazolium methane sulfonate IL[DOMIMS]. The ionic liquid-based substitution reaction mechanism was utilized for the ionothermal synthesis of TiO₂. The anatase phase structure and nanoparticle-like morphology of synthesized TiO₂ nanomaterial were confirmed by XRD analysis and TEM studies. The vibrational frequency of the Ti–O–Ti bond at 544 cm⁻¹ was measured usingthe FTIR spectrum, and the UV absorbance of the sample was studied usingthe UV/visible spectra. The prepared TiO₂ nanoparticles showed the best results of H₂ generation via awater-splitting reaction, liberating 2084 μmol·g⁻¹·h⁻¹ of H₂ gas. TiO₂ nanoparticles act as a good material for electrochemical applications such as supercapacitors and sensing of dopamine, as well as a better photocatalyst for the degradation of methylene blue.