Here we report a facile impregnation synthesis of layered Co­(OH)2 deposited with g-C3N4 while the pH value is adjusted by using ammonia solution for photocatalytic water oxidation with UV–vis and visible light illumination. This surface modification not only accelerates the interface transfer rate of charge carriers but also reduces the excessive energy barrier for O–O formation, thus leading to enhanced reaction kinetics for photocatalytic water oxidation. The optimum oxygen evolution rates (OERs) of the Co­(OH)2/g-C3N4 sample reached 27.4 and 7.1 μmol h–1 under UV–vis (λ >300 nm) and visible light (λ >420 nm) irradiation, which are 5.5 and 7 times faster than those for pristine g-C3N4, respectively. These results underline the possibility for the development of effective, robust, and earth-abundant WOCs for the promotion of water-splitting photocatalysis by sustainable g-C3N4 polymer photocatalysts.

Building step-scheme (S-scheme) heterojunctions is newly emerging to be an efficient means to get excellent photocatalysts for water pollution control. Herein, a 2D/0D S-scheme heterojunction of C3N5/Bi2WO6 is synthesized by...

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Cobalt selenide has been processed as an effictive cocatalyst to decorate with visible light photocatalysts, including WO 3 , BiVO 4 , and g-C 3 N 4 to establish intense surface contact with the substrates for photocatalytic water oxidation reaction. Compared with CoO x and CoS x , CoSe 2 is superior in improving the photocatalytic water oxidation activity due to the lowest anionic electronegativity to construct dense adhesion, enabling fast interfacial charge transfer for water oxidation reaction.Water splitting provides a promising and clean manner to convert solar energy into chemical fuel, which relaxes the excessive rely on fossil fuels. 1 However, any process of water splitting for solar H 2 production require promoters to catalyze the sluggish oxygen evolution reaction (OER), involving uphill energy consumption, multiple-electrons transfer, and complicated O-H bond breaking and O-O bond formation. 2 Currently, the state of the art water This journal is

The rational cooperation of sustainable catalysts with suitable light-harvesting semiconductors to fabricate photosynthetic device/machinery has been regarded as an ideal technique to alleviate the current worldwide energy and environmental issues. Cobalt based species (e.g., Co-Pi, Co3O4, and Co-cubene) have attracted particular attentions because they are earth-abundant, cost-acceptable, and more importantly, it shows comparable water oxidation activities to the noble metal based catalysts (e.g., RuO2, IrO2). In this contribution, we compared two general cocatalysts modification strategies, based on the surface depositing and bulk doping of ultrafine cobalt species into the sustainable graphitic carbon nitride (g-C3N4) polymer networks for oxygenic photosynthesis by splitting water into oxygen, electrons, and protons. The chemical backbone of g-C3N4 does not alter after both engineering modifications; however, in comparison with the bulk doping, the optical and electronic properties of the surface depositing samples are efficiently promoted, and the photocatalytic water oxidation activities are increased owing to much more exposed active sites, reduced overpotential for oxygen evolution and the accelerated interface charge mobility. This paper underlines the advantage of surface engineering to establish efficient advanced polymeric composites for water oxidation, and it opens new insights into the architectural design of binary hybrid photocatalysts with high reactivity and further utilizations in the fields of energy and environment.

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Polymeric carbon nitride (CN) is apromising material for photocatalyticw ater splitting.H owever,C Ni ni ts pristinef orm tends to show moderate activityd ue to fast recombinationo ft he charge carriers.T he design of efficient photocatalytic system is therefore highly desired, but it still remains ag reat challenge in chemistry.I nt his work, ap yrene-based polymer able to serve as an electron donor to accelerate the interface chargec arrier transfer of CN is presented. Thec onstruction of donor-acceptor (D-A) heterojunction was confirmed to significantly restrain the charger ecombination and, thus, improvet he proton reduction process. Thiss tudy providesapromising strategy to achieve solar H 2 production in an efficient and lowcost manner.