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This study focuses on the synthesis of Cu₂S particles as the core wrapped-up with thin layer of TiO₂-shell for improved surface and interface control of photo-excitons for H₂ production. Chemical states of metal Cu⁺, Ti⁴⁺ ions were confirmed by X-ray Photo-electron and Electron Paramagnetic Resonance (g-factor of 2.03) Spectroscopy. Transmission Electron Microscopic images revealed the hexagonal shape of Cu₂S wrapped-up with TiO₂ having the shell thickness varying from 12.0 to 16.7 nm. Time resolved transient photoluminescence decay spectra confirmed that three folds prolonged life-time of excitons generated on Cu₂S@TiO₂ core-shell than pristine Cu₂S. The batch photo-ractor used to evaluate the performance of photocatalysts in an aqueous solution containing Na₂S/Na₂SO₄ promoted oxidation reaction for H⁺ generation. The control over shell thickness directly influenced the optical and surface …