title: Ultralow Density, Monolithic WS2, MoS2, and MoS2/Graphene Aerogels.
abstract: We describe the synthesis and characterization of monolithic, ultralow density WS2 and MoS2 aerogels, as well as a high surface area MoS2/graphene hybrid aerogel. The monolithic WS2 and MoS2 aerogels are prepared via thermal decomposition of freeze-dried ammonium thio-molybdate (ATM) and ammonium thio-tungstate (ATT) solutions, respectively. The densities of the pure dichalcogenide aerogels represent 0.4% and 0.5% of full density MoS2 and WS2, respectively, and can be tailored by simply changing the initial ATM or ATT concentrations. Similar processing in the presence of the graphene aerogel results in a hybrid structure with MoS2 sheets conformally coating the graphene scaffold. This layered motif produces a ∼50 wt % MoS2 aerogel with BET surface area of ∼700 m(2)/g and an electrical conductivity of 112 S/m. The MoS2/graphene aerogel shows promising results as a hydrogen evolution reaction catalyst with low onset potential (∼100 mV) and high current density (100 mA/cm(2) at 260 mV).
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Marcus A
authors: MA
authors: Worsley
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Swanee J
authors: SJ
authors: Shin
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Matthew D
authors: MD
authors: Merrill
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Jeremy
authors: J
authors: Lenhardt
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Art J
authors: AJ
authors: Nelson
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Leta Y
authors: LY
authors: Woo
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Alex E
authors: AE
authors: Gash
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Theodore F
authors: TF
authors: Baumann
authors: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States.
authors: Christine A
authors: CA
authors: Orme
keywords: 2D materials; 3D assembly; catalysis; cryogel; graphene analogues; layered material; transition metal dichalcogenide (TMD)