You may also be interested in solar methane reforming and the like (at 70%+ efficiency from solar in to chemical energy out): http://www.pnnl.gov/news/release.

You may also be interested in solar methane reforming and the like (at 70%+ efficiency from solar in to chemical energy out): http://www.pnnl.gov/news/release.aspx?id=981 http://www.pnnl.gov/news/release.aspx?id=981 http://energy.gov/sites/prod/files/2015/01/f19/fcto_webinarslides_highly_efficient_solar_tc_reaction_systems_011315.pdf http://energy.gov/sites/prod/files/2015/01/f19/fcto_webinars...