Preparation method for achieving epitaxial growth on surface of metal organic framework through lattice symmetry matching two-dimensional material template
A metal-organic framework and epitaxial growth technology, which is applied in polycrystalline material growth, single crystal growth, crystal growth, etc., can solve the problems of high crystal plane orientation and unrealized growth, achieve high crystal plane selectivity, improve electrical Chemical performance, simple operation effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0023] Example 1: The graphene film grown on both sides of the copper foil by chemical vapor deposition and transferred to the TEM grid and the graphene nanosheet prepared by liquid-phase exfoliated graphite were used as templates to epitaxially grow a two-dimensional metal organic framework single crystal.
[0024] In the first step, in H with a volume ratio of 3:1 3 PO 4 :H 2 In the solution of O, the 30 μm thick copper foil was electrochemically polished at 3 A for 1.5 min, then washed three times with deionized water, and the copper foil was blown dry with a nitrogen gun; in the chemical vapor deposition system, the muffle furnace was heated To 1050 ℃, vacuumize, and then vacuum anneal the copper foil at high temperature for 20 min; 5000 Pa, grow a single-layer graphene film, take it out after cooling for 20 min, and transfer it to a TEM grid. Or use the metal-organic framework FDM-23 corresponding precursor solution, ultrasonic liquid phase exfoliation graphite to obta...
Embodiment 2
[0027] Example 2: Raman, atomic force microscopy, and X-ray diffraction were used to characterize the metal-organic framework single crystal epitaxially grown on a graphene template obtained by liquid phase exfoliation.
[0028] The first step is to take the photo of the single crystal light microscope and select the Raman mapping analysis area ( figure 2 .(a));
[0029] The second step is the analysis of Raman mapping results ( figure 2 .(b, c)), graphene nanosheets as crystal nuclei have characteristic peaks of 2D peaks, which can be distinguished from the two-dimensional metal organic framework single crystal;
[0030] In the third step, the AFM characterization analysis of the two-dimensional metal organic framework single crystal shows that the thickness distribution of the single crystal is 10-40nm, and the average value is 17 nm ( figure 2 .(d,e)).
[0031] In the fourth step, XRD analyzes the two-dimensional metal-organic framework single crystal and its bulk cry...
Embodiment 3
[0032] Example 3: The electrochemical performance of two-dimensional metal-organic framework single crystals and metal-organic framework crystals without templates obtained by epitaxial growth of graphene templates was characterized by electrochemical hydrogen evolution reaction (HER) catalytic performance.
[0033] like image 3 As shown, the HER performance curves of the two-dimensional metal-organic framework single crystal (GMOF) obtained by graphene template epitaxy growth and the metal-organic framework crystal without template were tested in the 0.5 M sulfuric acid system, and the GMOF has a smaller initial overpotential ( image 3 .(a)) and the Tafel slope ( image 3 .(b)); meanwhile, GMOF has a higher switching frequency ( image 3 .(c)) and the electrochemically active area ( image 3 .(d)). At the same time, the charge transfer resistance of GMOF was greatly reduced (from ~5 MΩ to ~200 Ω) ( image 3 .(e)), indicating that the GMOF synthesized by the epitaxial te...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More