A groundbreaking study conducted at Queen Mary University of London and Imperial College London introduces a novel approach to solar-to-hydrogen systems using cost-effective organic materials. The research focused on overcoming the challenges related to the instability of organic materials in water and energy losses at critical interfaces. By integrating an organic photoactive layer with a protective graphite sheet functionalized with a nickel-iron catalyst, the team achieved a high level of efficiency and durability, setting a new benchmark for the field. Dr. Flurin Eisner highlighted the versatility of organic materials in converting sunlight into fuels or chemicals, emphasizing the potential for sustainable fuels and chemicals production. The multi-layer device architecture employed in the study demonstrated exceptional photocurrent density, surpassing previous systems, and exhibited operational stability for days, unlike earlier designs that degraded quickly. The team's use of bulk heterojunction organic photoactive layers, combined with a self-adhesive graphite sheet, not only protected the device from degradation but also maintained efficient electrical connections, leading to record efficiency and stability. Furthermore, the research resulted in full water splitting devices capable of generating hydrogen from water and light without additional electricity, achieving a solar-to-hydrogen efficiency of 5%. Dr. Salvador Eslava emphasized the significant improvement in organic photoelectrochemical device performance and the advantages of organic bulk heterojunctions applied to the electrodes of photoelectrochemical cells. The outcomes of the study are expected to drive further advancements in the field, with the team focusing on enhancing material stability and scaling the technology for industrial applications.