The rGO-Co₃O₄-Pt nanocomposite surface was analyzed using X-Ray Photoelectron Spectroscopy (XPS) to determine the structure and valence states of carbon (C), oxygen (O), cobalt (Co), and platinum (Pt), as shown in Figure ). The prominent C 1s peak at 284.5 eV confirms the presence of sp²-hybridized carbon in the rGO framework, indicating the effective reduction of GO . The O 1s peak at 530-532 eV corresponds to oxygen, originating from the Co₃O₄ phase and residual oxygen-containing functional groups in the rGO structure . The Co 2p₃/₂ and Co 2p₁/₂ peaks at approximately 780 and 795 eV are characteristic of cobalt in Co₃O₄, reflecting a combination of Co²⁺ and Co³⁺ oxidation states . The observed peaks confirm the formation of cobalt oxide in the nanocomposite. A weak peak at 70-80 eV verifies the presence of platinum in the sample . The analysis shows that Co₃O₄ and Pt effectively functionalized the rGO matrix, forming a well-integrated rGO-Co₃O₄-Pt nanocomposite.