1-100 nm metal ferrite spinel coatings are provided on substrates, preferably by using an atomic layer deposition process. The coatings are able to store energy such as solar energy, and to release that stored energy, via a redox reaction. The coating is first thermally or chemically reduced. The reduced coating is then oxidized in a second step to release energy and/or hydrogen, carbon monoxide or other reduced species.
STATEMENT OF GOVERNMENT INTEREST
This invention was made with government support under grant number DE-FG36-06GO15044 awarded by the U.S. Department of Energy. The government has certain rights in this invention.