The article discusses a research breakthrough at HZB related to green hydrogen production using an 'artificial leaf' concept. By applying pressure to photoelectrochemical cells (PEC cells), researchers have found a way to enhance efficiency by reducing losses caused by bubble formation during water splitting. The use of inorganic photoelectrodes in PEC cells mimics natural photosynthesis but with higher efficiency rates of up to 19%. The study demonstrated that operating these devices at higher pressures, specifically 8 bar, can lead to a significant reduction in energy losses. By minimizing bubble-induced light scattering and electrolyte blockages, the efficiency of the electrolytic water splitting process can be improved. The team at HZB developed a multiphysics model to analyze the impact of pressure on PEC cells and identified 6–8 bar as the optimum pressure range for enhanced performance. Dr. Feng Liang, the lead author, highlighted the benefits of avoiding optical scattering losses and reducing product cross-over at higher pressures. These findings are expected to contribute to advancements in various electrochemical and photocatalytic devices for more efficient energy conversion processes.