The invention provides methods for reduction of metal oxide particles using a high temperature solar aerosol reactor. The invention also provides metal-oxide based processes for the generation of hydrogen from water splitting using a high temperature solar aerosol reactor. In addition, the invention provides solar thermal reactor systems suitable for use with these processes.
ACKNOWLEDGEMENT OF GOVERNMENT SUPPORT
 This invention was made, at least in part, with support from the Department of Energy under grant numbers DE-FG36-03G013062 and DE-FC36-99G010454. The United States government may have certain rights in this invention.