MEROSUN

MEROSUN - Harvesting of solar energy by spiropyran/merocyanine photoacidic nanosystems 

The current energy crisis calls for a transition to alternative feedstocks and new ways of harvesting energy based on sustainable and recyclable materials. Tools for converting sunlight into electricity represent the best way to afford energy locally, without the need for transmission and distribution lines. However, while solar photovoltaics are playing an increasing role in the global energy market, the cost and benefits of recycling crystalline silicon are still subjects of debate. New approaches capable of harvesting solar energy could give fresh impetus towards sustainable energy technologies.

MEROSUN will create alternative designs to conventional solar cells. It comprises the development of new aqueous-based photoelectrochemical cells which work by exploiting proton gradients out-of-equilibrium. These cells will be made of spiropyran/merocyanine photoacidic nanosystems – i.e., light-responsive systems that can be programmed to efficiently generate proton gradients following the absorption of sunlight. MEROSUN takes the challenge of evolving such photo-responsive chemical systems into a clean and affordable light harvesting technology. Specifically, we will carry out structure-function relationship studies to identify merocyanine photoacids featuring enhanced water solubility and chemical stability. Another objective is to design and synthesize selective supramolecular hosts that will increase their (photo)stability and amplify the pH difference attainable following

the absorption of sunlight. The project will also involve the design and testing of different cell geometries, which will be accompanied by theoretical modelling studies to ascertain the interplay between proton diffusion phenomena and energy harvesting efficiency.

MEROSUN is a multidisciplinary a project. It will combine our unique expertise in supramolecular chemistry, photochemistry, theoretical modelling, and electrochemistry to establish and apply a new eco-friendly mechanism for harvesting solar energy. Compared to existing technologies, the solar cells envisioned herein are made of cheap and recyclable components, that can be easily connected in series and/or in parallel to realize modules that are easily scalable. We believe the project outlined here will lay a solid foundation for spin-off opportunities with significant societal and economic impact.

PRIN PNRR Project n. P20222T49M, founded by European Union – NextGenerationEU, Mission 4, Component 2; CUP C53D23007810001