The electrochemical cell was enclosed with parafilm, silicon rubber septum, and vacuum grease to attain an air-tight condition and ensure no product gas leakage from the cell. The High precision gas-tight syringe was used to transfer the evolved gases from headspace into a gas chromatograph (GC; Dhruva CIC Baroda). A thermal conductivity detector and Flame Ionisation Detector was used to quantify the generated gas during electrocatalysis. The standard gas mixture was used for GC Calibration, and the carrier gas used was argon. Intense and sharp peaks confirm the excellent crystallinity of LSCO in XRD pattern. As shown in Figure (a), all the diffraction peaks of the compounds can be well identified as rhombohedral crystal structural. The prominent crystalline peaks at 2θ = 23.1°, 32.8°, 33.14, 47.4°, 58.8° are attributed to the crystal planes of (012), ( ), ( ), ( ) and (214) with R-3c space group symmetry for the LSCO catalyst. Scherrer's equation was used to calculate the average crystallite size, which was determined to be 28.1 nm (expressions is presented in the supplementary information in section 2.2). The absence of segregated Sr and Co species phases supports the creation of a single-phase compound. LaSrCoO3 may have formed as a Rhombohedral-type structure, comparable to LaCoO3, according to the pattern.