期刊
ACS NANO
卷 9, 期 5, 页码 4698-4705出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00087
关键词
transition metal dichalcogenide (TMD); 3D assembly; cryogel; 2D materials; graphene analogues; layered material; catalysis
类别
资金
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- U.S. Department of Energy [DE-AC02-05CH11231]
- UC Lab Fees Research Program [12-LR-235323]
- Lawrence Livermore National Laboratory Directed Research and Development (LDRD) [13-LW-099]
We describe the synthesis and characterization of monolithic, ultra low 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 similar to 50 wt % MoS2 aerogel with BET surface area of similar to 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 (similar to 100 mV) and high current density (100 mA/cm(2) at 260 mV).
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