Recent research is focused on leveraging BIEFs at the interface of different electronic environments to improve hydrogen production. Therefore, analysing and correlating parameters such as the work function, BIEF, and Gibbs free energy (a thermodynamic potential that can be used to calculate the maximum amount of work) is crucial for understanding the reaction mechanism. The difference in work functions between two materials is what drives the initial charge redistribution, which in turn sets up the built-in potential across the junction. BIEF directly affects the dynamics of proton adsorption/desorption, which was evaluated by Gibbs free energy of adsorption.
Scientists of Institute of Nano Science and Technology (INST), Mohali, grew CuWO4 (Copper tungsten oxide) nano-particles precursor over Cu (OH)2 (Copper hydroxide) and fabricated CuWO4-CuO hetero-structure and studied its physical and electrochemical properties. They examined the Gibbs free energy profile for proton adsorption of different regiones and found that near the depletion region and along the interface, the proton adsorption energy shows contrasting behaviour as compared with bulk area. This induces a gradient in Gibbs free energy across and near the depletion region, thereby promoting an improved hydrogen adsorption and desorption.