This review highlights the recent progress in porous materials (MOFs, zeolites, POPs, nanoporous carbons, and mesoporous materials) for CO2 capture and conversion.
Highly efficient photocatalysts for visible light-induced O 2 generation are synthesized via an electrostatically derived self-assembly of Zn-Cr-LDH 2D nanoplates with graphene 2D nanosheets. In the obtained nanohybrids, the positively charged Zn-Cr-LDH nanoplates are immobilized on the surface of negatively charged graphene nanosheets with the formation of a highly porous stacked structure. A strong electronic coupling of the subnanometer-thick Zn-Cr-LDH nanoplates with reduced graphene oxide (RGO)/graphene oxide (GO) nanosheets gives rise not only to the prominent increase of visible light absorption but also to a remarkable depression of the photoluminescence signal. The selfassembled Zn-Cr-LDH-RGO nanohybrids display an unusually high photocatalytic activity for visible light-induced O 2 generation with a rate of $1.20 mmol h À1 g À1 , which is far superior to that of the pristine Zn-Cr-LDH material ($0.67 mmol h À1 g À1 ). The fact that pristine Zn-Cr-LDH is one of the most effective visible light photocatalysts for O 2 production with unusually high quantum efficiency of 61% at l ¼ 410 nm highlights the excellent functionality of the Zn-Cr-LDH-RGO nanohybrids as visible light active photocatalysts. The Zn-Cr-LDH-RGO nanohybrid shows a higher photocatalytic activity than the Zn-Cr-LDH-GO nanohybrid, providing strong evidence for the superior advantage of the hybridization with RGO. The present findings clearly demonstrate that graphene nanosheets can be used as an effective platform for improving the photocatalytic activity of 2D nanostructured inorganic solids. Broader contextThe development of efficient photocatalysts for visible light-induced O 2 generation is one of the most important issues in the technology of solar energy harvesting. However, most of the photocatalysts ever-developed are not suitable for visible light-induced production of O 2 gas because of their non-optimized band structure with wide bandgap energy and the mismatched band position. Among inorganic solids, layered double hydroxide (LDH) with optimized electronic structure boasts very high photocatalytic activity for visible light-induced O 2 generation. The hybridization with electron accepting species provides a powerful way to further enhance the photocatalytic efficiency of the LDH material. In the present study, highly efficient photocatalysts for visible light-induced O 2 generation are synthesized via an electrostatically derived self-assembly of exfoliated Zn-Cr-LDH nanoplates with graphene nanosheets. A strong electronic coupling between two kinds of subnanometer-thick 2D nanostructured materials gives rise not only to the prominent increase of visible light absorption but also to a remarkable depression of electron-hole recombination. As a consequence, the resulting Zn-Cr-LDH-RGO nanohybrids display an unusually high photocatalytic activity for visible light-induced O 2 generation. The present ndings clearly demonstrate that graphene nanosheets can be used as an effective platform for improving the photocatalytic activity o...
Strongly coupled nanocomposites of layered titanate and reduced graphene oxide (RGO) are synthesized by electrostatically derived self-assembly between negatively charged RGO nanosheets and positively charged TiO(2) nanosols, which is then followed by a phase transition of the anatase TiO(2) component into layered titanate. The resulting nanocomposite consists of thin 2D nanoplates of lepidocrocite-type layered titanate immobilized on the surface of RGO nanosheets. The composite formation with RGO nanosheets is effective not only in promoting the phase transition of anatase TiO(2) nanosols, but also in improving the thermal stability of the layered titanate, indicating the role of RGO nanosheets as an agent for directing and stabilizing layered structures. The layered-titanate-RGO nanocomposites exhibit remarkably expanded surface area with the formation of micropores and mesopores. The composite formation with RGO nanosheets gives rise to the disappearance of the reflectance edge of layered titanate in the diffuse reflectance UV-vis spectra, indicating a strong electronic coupling between the RGO and layered titanate. The strong electronic correlation between the two components is further evidenced by the visible-light-induced generation of photocurrents after the hybridization with RGO. The layered-titanate-RGO nanocomposite shows a higher activity for the photodegradation of organic molecules than uncomposited layered titanate, underscoring the usefulness of graphene hybridization in improving the photocatalyst performance of layered titanate. The experimental findings presented here clearly demonstrate that the self-assembly of metal oxide nanoparticles with RGO 2D nanosheets is quite effective not only in synthesizing porous metal-oxide-graphene nanocomposites with improved photo-induced functionality, but also in achieving strong electronic coupling between RGO and metal oxides.
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