title: Solar to fuels conversion technologies: a perspective.
abstract: To meet increasing energy needs, while limiting greenhouse gas emissions over the coming decades, power capacity on a large scale will need to be provided from renewable sources, with solar expected to play a central role. While the focus to date has been on electricity generation via photovoltaic (PV) cells, electricity production currently accounts for only about one-third of total primary energy consumption. As a consequence, solar-to-fuel conversion will need to play an increasingly important role and, thereby, satisfy the need to replace high energy density fossil fuels with cleaner alternatives that remain easy to transport and store. The solar refinery concept (Herron et al. in Energy Environ Sci 8:126-157, 2015), in which captured solar radiation provides energy in the form of heat, electricity or photons, used to convert the basic chemical feedstocks CO2and H2O into fuels, is reviewed as are the key conversion processes based on (1) combined PV and electrolysis, (2) photoelectrochemically driven electrolysis and (3) thermochemical processes, all focused on initially converting H2O and CO2to H2and CO. Recent advances, as well as remaining challenges, associated with solar-to-fuel conversion are discussed, as is the need for an intensive research and development effort to bring such processes to scale.
authors.affiliation: Department of Materials Science and Engineering, Massachusetts Institute of Technology and Materials Processing Center, Cambridge, MA 02139 USA.|International Institute of Carbon Neutral Energy Research, Kyushu University, Fukuoka, Japan.
authors.forename: Harry L
authors.identifier: 0000-0001-8339-3222
authors.initials: HL
authors.lastname: Tuller
keywords: CO2 sequestration; Electrolysis; Fuel cell; Hydrogen economy; Photoelectrochemistry; Solar energy; Solar fuels; Thermochemical processes