10.1021/acsami.5b04640.s001 Soundarrajan Chandrasekaran Soundarrajan Chandrasekaran Thomas J. Macdonald Thomas J. Macdonald Andrea R. Gerson Andrea R. Gerson Thomas Nann Thomas Nann Nicolas H. Voelcker Nicolas H. Voelcker Boron-Doped Silicon Diatom Frustules as a Photocathode for Water Splitting American Chemical Society 2015 Water SplittingAn biosilica nanostructures magnesiothermic conversion antireflective properties biomineralizing microalgae hydrogen production Diatom frustules indium phosphide nanocrystal layers energy conversion diatom Hydrogen production fuel vectors Aulacoseira sp nanostructured silicon iron sulfur carbonyl electrocatalyst water splitting 2015-08-12 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Boron_Doped_Silicon_Diatom_Frustules_as_a_Photocathode_for_Water_Splitting/2141296 An effective solar-powered silicon device for hydrogen production from water splitting is a priority in light of diminishing fossil fuel vectors. There is increasing demand for nanostructuring in silicon to improve its antireflective properties for efficient solar energy conversion. Diatom frustules are naturally occurring biosilica nanostructures formed by biomineralizing microalgae. Here, we demonstrate magnesiothermic conversion of boron-doped silica diatom frustules from Aulacoseira sp. into nanostructured silicon with retention of the original shape. Hydrogen production was achieved for boron-doped silicon diatom frustules coated with indium phosphide nanocrystal layers and an iron sulfur carbonyl electrocatalyst.