Photocatalytic hydrogen production has been considered a promising approach to obtain green hydrogen energy. Crystalline porous materials have arisen as key photocatalysts for efficient hydrogen production. Here, we report a strategy to in situ photodeposit platinum clusters as cocatalyst on a covalent organic framework, which makes it an efficient photocatalyst for light-driven hydrogen evolution. Periodically dispersed adsorption sites of platinum species are constructed by introducing adjacent hydroxyl group and imine-N in the region of the covalent organic framework structural unit where photogenerated electrons converge, leading to the in situ reduction of the adsorbed platinum species into metal clusters by photogenerated electrons. The widespread platinum clusters on the covalent organic framework expose large active surface and greatly facilitate the electron transfer, finally contributing to a high photocatalytic hydrogen evolution rate of 42432 μmol g-1 h-1 at 1 wt% platinum loading. This work provides a direction for structural design on covalent organic frameworks to precisely manipulate cocatalyst morphologies and positions at the atomic level for developing efficient photocatalysts. 

/pdf/in-situ-photodeposition-of-platinum-clusters-on-a-covalent-15ys0mft.pdf

In situ photodeposition of platinum clusters on a covalent organic framework for photocatalytic hydrogen production

Efficient photocatalytic H2-evolution coupled with valuable furfural-production on exquisite 2D/2D LaVO4/g-C3N4 heterostructure

Antibacterial photocatalytic therapy (APCT) is considered to be a potential treatment for administrating antibiotic-resistant bacteria. However, due to the low photocatalytic efficiency and weak ability to capture bacteria, it is not practically applied. In this work, an organic-metal oxide hybrid semiconductor heterostructure is fabricated for the photocatalytic generation of reactive oxygen species (ROS) to kill the drug-resistant bacteria. The organic semiconductor, perylene diimide (PDI), can self-assemble on Sn3 O4 nanosheets to form a "hook-and-loop" sticky surface that can capture bacteria, via large numbers of hydrogen bonding and π-π stacking interactions, which are not possible in inorganic semiconductors. This easy-to-fabricate hybrid semiconductor also possesses improved photocatalytic activity, which is owing to the formation of heterostructure that achieves full-spectrum absorption, and the reduction of the photocarrier recombination rate to produce more reactive oxygen species. It has a good promoting effect on the wounds of mice infected by Staphylococcus aureus. This work shows new ideas for fabricating smart full-spectrum inorganic-organic hybrid adhesive heterostructure photocatalysts for antibacterial photocatalytic therapy.

Full Solar-Spectrum-Driven Antibacterial Therapy over Hierarchical Sn 3 O 4 /PDINH with Enhanced Photocatalytic Activity.

Mechanically flexible, waterproof, breathable cellulose/polypyrrole/polyurethane composite aerogels as wearable heaters for personal thermal management

Enhanced photocatalytic hydrogen evolution of 2D/2D N-Sn3O4/g-C3N4 S-scheme heterojunction under visible light irradiation

Sn3O4 is a promising, low-cost, nontoxic catalyst with suitable bandgap structure for visible-light hydrogen evolution reaction (HER). The micro-structural modifications leading to more efficient charge separation is essential for improving the photocatalytic performance. In this study, a novel Sn3O4/polypyrrole (PPy) heterostructure photocatalyst with porous Sn3O4 nanosheets in-situ anchored on PPy hollow nano rod was constructed through a two-step method combining chemical oxidative polymerization and hydrothermal process. The best hydrogen photo-generation performance was obtained for Sn3O4/2.44 wt%PPy heterostructure reaching 481.05 μmol gcatalyst−1 H2 within 5 h, which is 7.52 times higher than that of pure Sn3O4. The enhanced hydrogen photo-generation performance can be attributed to the effective charge transfer induced by the electron collector PPy which triggered the photo-induced e- directionally migration and the unique 3D micro-structure of this Sn3O4/PPy photocatalyst.

Porous Sn3O4 nanosheets on PPy hollow rod with photo-induced electrons oriented migration for enhanced visible-light hydrogen production

A novel polyaniline (PANI)/Sn3O4 heterojunction composed of PANI nanofibers and Sn3O4 nanosheets was fabricated by a facile physical milling technique. Modification of Sn3O4 with a PANI conductive polymer contributes to facilitating interfacial charge transfer efficiency, and thus, significantly enhances the visible-light Rhodamine B (RhB) photo-degradation. Results indicate that PANI/Sn3O4 heterostructures with 10 wt% PANI reached the maximum degradation efficiency (around 97%) for RhB within 5 h, which is 2.27 times higher than that of Sn3O4 alone. This improvement is due to the p–n heterostructure formation in PANI/Sn3O4. Moreover, the outcome of reactive species capturing experiments demonstrated that in PANI/Sn3O4, holes made the largest contribution to RhB degradation under visible light illumination, while hydroxyl radicals showed less significance under the same conditions. In addition, the photocatalytic mechanism was proposed based on evidence from the reactive species test and energy band structure analysis.

/pdf/visible-light-photocatalytic-capability-and-the-mechanism-1efg259zuv.pdf

Visible-light photocatalytic capability and the mechanism investigation of a novel PANI/Sn3O4 p─n heterostructure

Herein, a three-step approach toward a multi-layered porous PBC/graphene sandwich has been developed, in which the chemical bonding interactions have been successfully enhanced via esterification between the layers of pyrolyzed bacterial cellulose (PBC) and graphene. Such a chemically induced compatible interface has been demonstrated to contribute significantly to the mass transfer efficiency when the PBC/graphene sandwich is deployed as electrode material for both supercapacitors and lithium–sulfur batteries. The high specific capacitance of the supercapacitors has been increased by three times, to 393 F g−1 at 0.1 A g−1. A high initial discharge specific capacity (~1100 mAhg−1) and high coulombic efficiency (99% after 300 cycles) of the rPG/S-based lithium–sulfur batteries have been achieved.

/pdf/chemically-induced-compatible-interface-in-pyrolyzed-7dc4oek6.pdf

Chemically Induced Compatible Interface in Pyrolyzed Bacterial Cellulose/Graphene Sandwich for Electrochemical Energy Storage

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Porous Sn3O4 nanosheets on PPy hollow rod with photo-induced electrons oriented migration for enhanced visible-light hydrogen production

Visible-light photocatalytic capability and the mechanism investigation of a novel PANI/Sn3O4 p─n heterostructure

Chemically Induced Compatible Interface in Pyrolyzed Bacterial Cellulose/Graphene Sandwich for Electrochemical Energy Storage