Mesoporous CdSe materials are promising photo-catalysts for water splitting as well as photo-sensitizers toward CO2 conversion in the presence of co-catalysts. Here, CdSe materials with moderate mesoporosity (0.1-0.2 cm3/g) and surface area (30-60 m2/g) have been synthesized via chemical ion-exchange in aqueous solutions. Sheet-like CdSe(ethylenediamine)0.5 were successively introduced to create homogeneous or heterogeneous mesopores (4-8 nm). Orthorhombic and hexagonal structures of CdSe are individually obtained after reacting with S2-and Fe3+, confirmed by XRD and HRTEM. For S2- treated CdSe(ethylenediamine)0.5, residual sulfides were found predominately at the edges of the CdSe sheets with controllable substitutions of anions (S/Se=0.1-0.3). For Fe3+ treated CdSe(ethylenediamine)0.5, the original orthorhombic structure was transformed into hexagonal one (wurtzite), instead, with loss of most organic components. Formation of ion-induced mesoporosity in 2D semiconductors demonstrates potential catalysts and substrates for energy conversion reactions.

Formation of 2D semiconductors with mesoporosity

2019 Spring National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.