In situ growth of Ag₂S quantum dots on SnS₂ nanosheets with enhanced charge separation efficiency and CO₂ reduction performance

Abstract

Photocatalytic CO2 reduction to carbon fuels is desirable solutions to replace conventional fossil fuels. Herein, SnS2 nanosheets (NSs) were fabricated via facile hydrothermal method, which transformed to thinner and more...

Design and synthesis of a covalent organic framework bridging CdS nanoparticles and a homogeneous cobalt–bipyridine cocatalyst for a highly efficient photocatalytic CO2reduction

“…65,66 The decrease in CdS size and the strong interfacial interaction between CdS and TpBpy are supposed to suppress the bulk electron–hole recombination of CdS and facilitate the interfacial charge transfer. 14,67 From the high-resolution TEM (HRTEM) and STEM images of the hybrids (Fig. S12d and S13e†), the interplanar spacings of the dispersed CdS particles and TpBpy are determined to be 0.33 and 0.34 nm, corresponding to the (111) plane and the π–π stacking between the COF layers.…”

Ag2S Quantum Dots for Use in Whole-Cell Biohybrid Catalyst for Visible-Light-Driven Photocatalytic Organic Pollutant Degradation

“…Under visible light irradiation, electron–hole pairs are generated in the conduction band (CB) and valence band (VB) of the synthesized Ag 2 S QDs. The band gap of the Ag 2 S QDs is calculated to be 1.53 eV from the UV–vis-DRS spectrum (Figure S4b), which is higher than that of bulk Ag 2 S (0.9 eV) due to quantum confinement effects. , Meanwhile, the potential values of CB and VB of Ag 2 S QDs are calculated to be −0.31 eV (CB) and 1.22 eV (VB) according to previously reported formulas. , Due to the potential of O 2 /•O 2 – (−0.28 eV vs. NHE), electrons with a potential of −0.31 eV transfer from the CB of Ag 2 S QDs to O 2 to generate •O 2 – . However, as the potential of •OH/H 2 O (2.38 eV vs. NHE) is lower than the VB of Ag 2 S QDs (1.22 eV vs. NHE), oxidative species (•OH) cannot be generated, which is consistent with the above mentioned ESR results.…”

“…We also investigated the effect of SOD on the E. coli-Ag 2 S QD biohybrid system as it can convert S4b), which is higher than that of bulk Ag 2 S (0.9 eV) due to quantum confinement effects. 39,40 Meanwhile, the potential values of CB and VB of Ag 2 S QDs are calculated to be −0.31 eV (CB) and 1.22 eV (VB) according to previously reported formulas. 41,42 , which in turn react with the organic pollutants to degrade the organic pollutants.…”

Metal to non-metal sites of metallic sulfides switching products from CO to CH4 for photocatalytic CO2 reduction

“…2c ). The possible reason is that the Sn atoms are in different crystal structures 38 . Furthermore, the binding energies of S 2p 3/2 and S 2p 1/2 in the CuInSnS 4 sample are measured to be 161.45 eV and 162.70 eV, respectively, which corresponds to the S 2− valence state.…”