The article discusses a groundbreaking study conducted in São Carlos, Brazil, focusing on the creation of films integrating polyaniline nanostructures with multi-walled carbon nanotubes. These films have shown promising potential in the field of photoelectrocatalysis, particularly in the production of hydrogen (H2) through solar-driven water splitting. Referred to as green hydrogen, this renewable energy source is gaining traction as a sustainable alternative to conventional fuel. The material's ability to efficiently absorb light and maintain stability is highlighted as essential for successful H2 production. Polyaniline, despite being an organic semiconductor known for over a century, is now gaining attention for its exceptional electrical conductivity. The research was a collaborative effort involving the Center for Development of Functional Materials (CDMF) and the Center for Innovation in New Energies (CINE), both with support from FAPESP in partnership with various academic institutions. By combining expertise in nanotechnology, energy efficiency, and scientific innovation, the study paves the way for advancements in utilizing polymer materials for renewable energy applications. The full article titled 'In situ polymerized polyaniline films over multi-walled carbon nanotube coatings for enhanced photoelectrochemical performance' can be accessed for further details and insights on this innovative approach to green hydrogen production.