This new technology can turn sunlight into a liquid which later can be released into heat energy.

Many consider the sun the energy source of the future. But one challenge is that it is difficult to store solar energy and deliver the energy without using large expensive batteries 

A research team from Chalmers University of Technology in  Sweden, has shown that it is possible to convert the solar energy directly into energy stored in the bonds of a chemical fluid. The liquid chemical makes it possible to store and transport the stored solar energy and release it on demand. The process is based on the natural compound norbornadiene that upon exposure to light converts into quadricyclane.

‘The technique means that that we can store the solar energy in chemical bonds and release the energy as heat whenever we need it.’ says Professor Kasper Moth-Poulsen. ‘Combining the chemical energy storage with water heating solar panels enables a conversion of more than 80 percent of the incoming sunlight.’

The research project was initiated at Chalmers over 6 years ago and the research team contributed in to a first conceptual demonstration. At the time, the solar energy conversion efficiency was 0.01 percent and the expensive element ruthenium played a major role in the compound. Now, four years later, the system stores 1.1 percent of the incoming sunlight as chemical energy. An improvement of a factor of 100. Also, ruthenium has been replaced by much cheaper carbon-based elements. 

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