Solar energy for carbon-free liquid fuel
The Sun-to-X project will contribute to European Commission targets for  clean energy for all and circular economy by developing a system for the conversion of solar energy into storable chemical fuel. While the concept of solar-to-chemical fuels has been around for decades, the technology has been limited by the economic viability and scalability of the technology.
The Sun-to-X project focuses on using solar energy to produce  a carbon-free, non-toxic, energy-dense, liquid fuel - Hydrosil, with very good long-term stability, which is applicable in the transport and energy sectors. We will firstly produce hydrogen as chemical intermediate through a photoelectrochemical device. This will then be converted to Hydrosil through a thermochemical reaction.

The novelty of our proposal lies in the following three key aspects:  
1. Overcoming the known practical challenges of high-performance photoelectrochemical fuel production by using membrane photoelectrode assemblies which can operate with solar energy using only ambient humidity as the water supply
2. Developing reactors for and demonstrating the renewable production of Hydrosil for the first time, using a thermochemical process (using concentrated solar light)
3. Demonstrating a completely decarbonised energy cycle with liquid fuels

In addition, we will demonstrate the applicability of Hydrosil towards the transition to a circular economy, by using it for the valorisation of waste plastics.