Organic Heterojunction Photocatalysts for Solar-Driven Green Hydrogen Synthesis From Water

The sustainable generation of green hydrogen is a critical challenge in our transition towards net zero. Artificial photosynthetic systems based on photocatalytic particles in suspension offer one of the potentially lowest cost routes to green hydrogen production using sunlight. However the limited visible light absorption of most photocatalytic systems to date, typically based on metal oxides, has to date limited achievable conversion efficiencies. Recently, substantial breakthroughs have been achieved in the performance of photocatalyst particles based on organic semiconductors, harnessing solar light across the visible and near infrared. However to date efficient hydrogen generation has only been achieved in the presence of sacrificial electron donors. In this project, we will focus on the development of organic heterojunction photocatalysts with controlled nanomorphology and their integration into a hybrid organic / inorganic tandem system for green hydrogen synthesis from water without any sacrificial species. The project brings together the expertise of the Durrant group at Imperial in the spectroscopy and photochemical function of photocatalytic systems with the McCulloch group's expertise in the design and synthesis of organic semiconductors. It further benefits from the participation of two talented researcher / co-investigators, Dr Soranyel Gonzalez Carrera (Imperial) with expertise in nanoparticle processing and photocatalytic characterisation and Dr Catherine Aitchison at Oxford with expertise in templating strategies for organic photocatalysts.

The project will focus on the synthesis, characterisation and optimisation of visible / near IR absorbing organic heterojunction photocatalyst nanoparticles. Optimised nanoparticles will be tested in a tandem Z-scheme configuration with facet engineered Bismuth Vanadate particles supplied by our project partner, Prof Can Li from the University of Dalian, in order to achieve overall water splitting. Two...