Piante e canali del calcio

Engineered MoSe2‐Based Heterostructures for Efficient Electrochemical Hydrogen Evolution Reaction

“…The MoSe 2 flakes are produced by LPE, [35,37] followed by SBS, [116][117][118] The graphene flakes are produced by the LPE, [35,37] followed by SBS, [116][117][118] The SWCNTs (> 90% purity, Cheap Tubes) are used as received, without any purification steps. The SWCNT dispersions are produced by dispersing SWCNTs in NMP at a concentration of 0.2 g L -1 using ultrasonication-based de-bundling.…”

“…The MoSe 2 flakes are produced by the LPE [35,37] of the MoSe 2 bulk crystal in IPA (see Experimental Section), thus avoiding typical problems relating to the LPE of TMDs in toxic and high boiling point solvents such as NMP and dimethylformamide (DMF), including hightemperature annealing processing for solvent removal as well as surface oxidation. [122,123,124] The morphology of the MoSe 2 flakes, as selected by the SBS process [116][117][118] (see Optical absorption spectroscopy (OAS) of MoSe 2 flake dispersion in IPA is reported in Figure S2. Absorption peaks around 810 nm (1.53 eV) and 708 nm (1.75 eV) correspond to the A and B excitonic peaks.…”

“…The graphene flake dispersions are produced by LPE, [35,37] followed by the SBS [116][117][118] of pristine graphite in NMP, while SWCNT dispersions are produced by dispersing SWCNTs in NMP with the aid of ultrasonication for the de-bundling process. [119,120] Additional details concerning the dispersion production are reported in the Experimental Section, following procedures previously reported.…”

“…As depicted in Figure 1, MoSe 2 and graphene flakes are produced in the form of dispersion by the LPE [35][36][37][38][39] of their bulk counterparts in 2-Propanol (IPA) and N-Methyl-2-pyrrolidone (NMP), respectively, which is followed by a sedimentation-based separation (SBS) process. [116][117][118] The SWCNT dispersions are produced by first dispersing SWCNTs in NMP then conducting an ultrasonication-based de-bundling process. [119][120][121] Subsequently, graphene/MoSe 2 or SWCNTs/MoSe 2 heterostructures are fabricated by sequentially depositing the as-formulated dispersions on nylon membranes through vacuum filtration.…”