Ultrathin Carbon Nitride with Atomic-Level Intraplane Implantation of Graphited Carbon Ring Domain for Superior Photocatalytic Activity in the Visible/Near-Infrared Region
Efficient photocarrier transfer and sufficient light absorption play a crucial role in improving photocatalytic H2 evolution activity. Hence, we report a conceptual design of ultrathin carbon nitride intra-plane implanted with graphited carbon ring domain (CN-GP) via thermal polymerization of polyvinyl butyral and melamine membrane, displaying obvious disparities in the decoration type compared with the adsorption of graphene on the bulk g-C3N4 surface. This unique intra-plane heterostructural CN-GP can greatly sheathe the visible/near-infrared light range, expedite electron-hole pair separation and weaken the barrier of the photocarrier transfer through their suitable energy band structures and in-built electric felds. Consequently, the CN-GP displayed remarkable photocatalytic activity under visible/near-infrared illumination by acquiring a H2 production rate of 11.33 mmol g-1 h-1, and even showed near-infrared-drived photocatalytic activity. This work presents an effective way for the rational fabricat...
#1Jianxian Zeng(Hunan University of Science and Technology)H-Index: 8
#2Chaoqiang Lv(Hunan University of Science and Technology)H-Index: 3
Last. Ying Wang(Hunan University of Science and Technology)H-Index: 1
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Abstract A novel ion-imprinted blend membrane was fabricated to separate selectively platinum(IV) from aqueous media. An amphiphilic copolymer poly(methyl methacrylate)-b-poly(4-vinylpyridine) (PMMA-b-P4VP) was firstly synthesized via the reversible addition fragmentation chain transfer polymerization, and characterized by 1H NMR, FT-IR and GPC. Subsequently, poly(vinylidene fluoride) (PVDF) blend membranes were prepared using PMMA-b-P4VP as a blending additive. Effects of the following factors ...
#1Zhao Zhang(China University of Geosciences)H-Index: 5
#2Luhua Lu(China University of Geosciences)H-Index: 32
Last. Kai Dai(Huaibei Normal University)H-Index: 35
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Abstract The Feasibility of interfacial redox reaction has determinant role in hydrogen evolution during photocatalytic water-splitting process. Here, we report that promoting interfacial oxidation ability of porous graphitic carbon nitride (Pg-C 3 N 4 ) with defects can effectively improve visible light photocatalytic hydrogen evolution (PHE) activity. Pg-C 3 N 4 with edge site defects was fabricated by constraining growth of g-C 3 N 4 on porous kaolinite-derived template. The Pg-C 3 N 4 with e...
: A green, template-free and easy-to-implement strategy was developed to access holey g-C3 N4 (GCN) nanosheets doped with carbon. The protocol involves heating dicyandiamide with β-cyclodextrin (βCD) prior to polymerization. The local symmetry of the GCN skeleton is broken, yielding CxGCN (x corresponds to the initial amount of βCD used) with pores and a distorted structure. The electronic, emission, optical and textural properties of the best-performing material, C2GCN, were significantly modif...
Ti3C2Tx is a 2-dimensional titanium carbide material featuring outstanding electrochemical properties. In spite of this, application of Ti3C2Tx as co-catalyst in photo-catalysis is rarely explored, probably because of its metallic nature and hydrophilic surface. Given that Ti3C2Tx with different surface terminations exhibits large differences in catalytic, electrochemical and chemical properties, we demonstrate an improvement of the photocatalytic activity of Ti3C2Tx as a co-catalyst by annealin...
#1Qing Han(BIT: Beijing Institute of Technology)H-Index: 15
#2Zhihua Cheng(BIT: Beijing Institute of Technology)H-Index: 17
Last. Liangti Qu(BIT: Beijing Institute of Technology)H-Index: 90
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Photocatalytic water splitting for hydrogen evolution by utilizing solar energy has a great significance for high-density solar energy storage and environmental sustainability. Here, a defect-rich amorphous carbon nitride (DACN) photocatalyst has been synthesized by simply direct calcination of the rationally size-reduced urea crystals. The introduction of nitrogen vacancies combined with disordered structure cause a broad visible-light-reponsive range, countless lateral edge/exposed surface bon...
#1Ting Song(SCUT: South China University of Technology)H-Index: 15
#2Piyong Zhang(SCUT: South China University of Technology)H-Index: 15
Last. Heping Zeng(SCUT: South China University of Technology)H-Index: 17
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Abstract Graphitic carbon nitride (CN) nanosheets have aroused a great deal of interest due to their capability to utilize visible light to split water into its constituent molecules of hydrogen and oxygen (H2 and O2). However, the photocatalytic capacity of conventional bulk g-C3N4, with its large π-π conjugated electronic system, is still constrained by the π-π stacking interaction and small number of active sites. Hence, an uncomplicated post-processing method to construct a different π-π con...
Last. Yi-Jun Xu(FZU: Fuzhou University)H-Index: 90
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Abstract Graphene oxide (GO) has widely been used as the precursor of graphene to construct graphene-semiconductor composite photocatalysts for various redox reactions. However, the electrical conductivity and charge carrier mobility of reduced GO (RGO) are remarkably decreased due to considerable disruption of the 2D π-conjugation of the electronic structure in the domain of RGO sheets, which results that the net improvement efficiency of photoactivity is often limited. Herein, we report a simp...
In this work, trithiocyanuric acid and graphene oxide quantum dots (GOQDs) served as sulfur (S) and carbon (C) sources to prepared S-, C-codoped carbon nitride (SCCN). The morphology of SCCN changes from lamellar to airbag-like nanostructure with GOQD addition. The photocatalytic hydrogen evolution performance of the optimized SCCN photocatalyst is shown to be 5.6 times higher than that of the CNS photocatalyst. The mechanism of the improved performance is further investigated. It is found that ...
Last. Ting Song(XTU: Xiangtan University)H-Index: 3
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ABSTRACT null null To make the efficient spatial charge separation and exploration of broad spectrum-driven H2 evolution remains a pivot challenge. Here, a novel core@shell Cr1.3Fe0.7O3@amine-containing carbon quantum dots (S1@NCQD) composite was successfully prepared by a facile bottom-up self-assembly route. An ordinary contact structure of carbon quantum dots (CQD) modified Cr1.3Fe0.7O3 was also prepared. The photocatalytic H2 production rate of Cr1.3Fe0.7O3 composite has not been improved on...
Last. Ting Song(XTU: Xiangtan University)H-Index: 3
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Abstract null null Defect engineering is an effective path to prune the performance of photocatalysts but are rarely reported in graphene-semiconductor composites. Here, the few-layered graphene materials with different defect contents are obtained through facile alkali-assisted “cutting-thin” technique. Meanwhile, the monolayer graphene with low defect content is also synthesized on a variety of biomasses via the same uncomplicated process. Importantly, the defects in few-layered graphene have ...
Abstract The microstructure design of polymeric carbon nitride (PCN) has been proved to promote the interlayer transport of photogenerated electron, but its influence mechanism is still not unequivocal. Herein, based on the PCN nanotube model with actual thickness, we proposed a novel mechanism by density functional theory (DFT) calculation, which explained the effect of the nanotube structure of photogenerated electron interlayer transport. The calculation results revealed that the bending laye...
Last. Guo-Jun Deng(XTU: Xiangtan University)H-Index: 3
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Abstract Designing plasmonic catalysts capable of efficient and selective photocatalytic CO2 reduction is considerable important for future carbon energy utilization. Herein, among many plasmonic bimetals, dagger-axe-like Cu@Co core-shell bimetal exhibits excellent photocatalytic CO2 reduction activity. The incorporation of Co layer into a Cu matrix constructs a core-shell structure, which could increase the CO2 adsorption capacity of Cu, thus promoting faster CO2 adsorption/activation. The elec...
Abstract Graphitic carbon nitride (g-C3N4), as a significant metal-free photocatalyst, has elicited ripples of excitement due to its many extraordinary features, such as its mild bandgap, high thermal and chemical stability, inexpansive, and environmental friendly. However, the unsatisfactory solar light absorption, low surface area and the rapid recombination of photogenerated charges severely restrict the photocatalytic activity of bulk g-C3N4. Especially, g-C3N4 with a bandgap of 2.7 eV means...
Last. Guo-Jun Deng(XTU: Xiangtan University)H-Index: 56
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Abstract Plasmonic nanocatalysis provides a unique approach of improving catalyst stability and catalytic activity for the photocatalytic CO2 conversion into valuable fuels. Herein, among many metals, pristine Cu nanoparticles (Cu NPs) driven through the localized surface plasmon resonance (LSPR) exhibit enhanced photocatalytic activity. Interestingly, different numbers of phenothiazine units bonded to the benzene ring and combined with Cu NPs show significantly different photocatalytic activiti...
#1S. Vinoth(CSIR: Council of Scientific and Industrial Research)H-Index: 5
#1S. Vinoth(CSIR: Council of Scientific and Industrial Research)
Last. A. Pandikumar(CSIR: Council of Scientific and Industrial Research)H-Index: 11
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Abstract Cobalt incorporated sulfur-doped graphitic carbon nitride with bismuth oxychloride (Co/S-gC3N4/BiOCl) heterojunction is prepared by an ultrasonically assisted hydrothermal treatment. The heterojunction materials have employed in photoelectrochemical (PEC) water splitting. The PEC activity and stability of the materials are promoted by constructing an interface between the visible light active semiconductor photocatalyst and cocatalysts. The photocurrent density of Co-9% S-gC3N4/BiOCl ha...
#1Saikat Kumar Kuila(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 3
#2Deepak Kumar Gorai(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 1
Last. Tarun Kumar Kundu(IIT-KGP: Indian Institute of Technology Kharagpur)H-Index: 3
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Abstract The low band gap energy and high surface area two-dimensional materials allow it to tune its basic properties using surface decoration. Here, La3+ are decorated on two-dimensional graphitic carbon nitride using a simple and easily scalable chemisorption process with an adsorption capacity of 657.32 mg g−1. In the X-ray diffraction (XRD) study, the positive slope of the W–H plot elucidates the tensile strain generation (0.103) in La3+ ions decorated 2D-g-C3N4 (La3+-2D-g-C3N4). The high-r...
Last. Guo-Jun Deng(XTU: Xiangtan University)H-Index: 3
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Abstract Regulating morphology has recently become an effective approach to improve the photocatalytic activity of graphite carbon nitride, but its morphology types are still limited. Herein, ultralong hollow chain-ball-like carbon nitride implanted with oxygen (OCNT) was prepared through a facile supramolecular self-assembly route. The ultralong hollow chain-ball-like structure results in enhanced photoinduced charge carrier separation. In particular, the implantation of oxygen into the chemica...