The main focus of this research is on energy production by clean photocatalytic technology. By using the sol–gel process, yttrium titanate nano‐photocatalysts modified with europium (x mol. Eu³⁺:Y₂Ti₂O₇) have been created and used to produce photocatalytic biogas and hydrogen using acetic acid. X‐ray powder diffraction (XRD) confirms the formation of cubic Y₂Ti₂O₇ phase. Microscopic study has indicated that Eu doping improved the shape, size, and dispersity of Y₂Ti₂O₇ photocatalyst. Different crystal defects, including oxygen vacancies (OVs) and Ti³⁺ species, are demonstrated by X‐ray photoelectron spectroscopy (XPS) studies. Compared with pure Y₂Ti₂O₇, 0.03 mol. Eu³⁺:Y₂Ti₂O₇ has the highest proportion of lattice defects. The band gap energies have increased as a result of doping on Y₂Ti₂O₇ size. Urbach energy calculations confirm that Eu³⁺:Y₂Ti₂O₇ nano‐photocatalyst has the highest degree of distortion. The photoluminescence (PL) measurements have shown that 0.03 mol. Eu³⁺ dopant can effectively separate the active charge carriers. Electron spin resonance proved the progressive increase of defect states (OV and Ti³⁺) by doping, which promoted the photocatalytic activity of the nano‐photocatalyst. These photocatalysts have generated biogas and hydrogen gas via photocatalytic oxidation of acetic acid under inert conditions. The maximum photocatalytic activity for the generation of biogas and hydrogen is found in 0.03 mol. Eu³⁺:Y₂Ti₂O₇. The maximum photocatalytic activity of 0.03 mol. Eu³⁺:Y₂Ti₂O₇ is correlated with higher lattice defects (OV, Ti³⁺) and reduced charge carrier recombination. The proposed photocatalytic mechanism has been discussed. According to the findings, Eu³⁺:Y₂Ti₂O₇ nano‐photocatalyst is a promising nanomaterial for the generation of energy.

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