Hydrogen energy is one of the highly sort out energy generation pathways leading towards the goal of creating a sustainable and renewable world energy cycle. In this article, we present a detailed study on the plasmonic enhancements of the CuO (Cupric oxide) nanofoam structures grown on thin Cu foil as a substrate, which are utilised as photo-electro catalytic electrodes for water splitting and CO2 reduction applications. The synthesis route used to grow the nanofoams is the electrochemical method, which is quite simple, cost-effective, and easily scalable. The selectivity of the CuO nano-foam structural dimensions is achieved via tuning the solvent concentration and the electro-potential values. Material characteristics were obtained using various techniques. In addition, FDTD simulations were carried out to study the optical properties. The FDTD studies were modelled based on the synthesised CuO nanofoams to have a good comparison between the results of simulations vs synthesis. The observed optical absorption values show an enhancement of near 2-fold for CuO nanofoams with specific dimensions vs CuO thin film in the visible spectra. Moreover, there is an increase in the effective surface area (catalytic sites) by 6-fold, which is an added advantage when using the material as a photo-catalytic electrode for water splitting applications.