RESEARCH / A0327
Ionic Hydrophobic Gates on Metal–Organic Frameworks Enable High-Purity CO2 Separation from Humid Flue Gas
Read the original paper · 10.1021/jacs.5c02093 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 2. (a) TEM image, (b) magnified local view, and (c) EDS mappings of the core−shell MOF@IHG synthesized via a three-cycle stepwise IHG coating onto MOF-808(Zr). (d) Depth-profiling XPS spectra of S 2p, F 1s, and N 1s in MOF@IHG with different etching depths (from top to bottom: 0, 10, 15, 20, and 25 nm). (e) N2 adsorption−desorption isotherms and corresponding pore size distributions of MOF-808(Zr) and MOF@IHG at 77 K. (f) Digital photographs of water dispersion on MOF@IHG and the corresponding water contact angle. (g) Normalized Zr K- edge XANES spectra of MOF@IHG, MOF-808(Zr), and reference samples (ZrN, ZrO2, and Zr foil); Inset: Average oxidation state of Zrδ+ species. (h) Zr K-edge FT-EXAFS spectra of MOF@IHG, MOF-808(Zr), and reference samples; (i) Wavelet transform EXAFS spectrum of MOF@IHG. (j) Zr 3d and (k) N 1s XPS spectra of MOF@IHG. (l) Low-temperature (123 K) FT-IR spectra of CO adsorption on MOF-808(Zr) and MOF@ IHG at the same CO coverage (5 cm3).