Fig. 2: Photocatalytic CO2RR on SA/MOF powder catalysts.
From: Metal-organic framework membranes with single-atomic centers for photocatalytic CO2 and O2 reduction
a, b The enhancing of light harvesting and conversion efficiency for A-aUiO through defects engineering. UV–Vis diffusive reflectance spectra (a) and photocurrent-potential curves (b) for A-aUiO and a-UiO samples, respectively. Inset in a: Digital photograph showing the color of aUiO and A-aUiO samples. c Time course of HCOOH evolution on A-aUiO, Ir1/A-aUiO, Irx/A-aUiO and IrNPs/A-aUiO catalysts. d HCOOH and H2 selectivity as a function of Ir loadings in Ir/A-aUiO catalysts. e Ir L-edge XANES spectra of Ir/A-aUiO catalysts with different Ir loadings. Ir foil and IrO2 were used as standards. The first maximum of the XANES curves after the absorption edge (dashed line) shows gradual positive movement with decreasing Ir loading, suggesting the metallicity of the Ir species was gradual decreased. f Apparent activation energy (Eapp) of various catalysts for HCOOH generation. g HCOOH yields on A-aUiO and aMIL catalysts with and without Ir SAs modification. All the photocatalytic reactions were performed under visible light (>420 nm) irradiation and using isopropanol (20 v/v% in water) as sacrificial agents. Error bars were calculated by carrying out three parallel catalysis reactions.
