Vopor-polymerization strategy to carbon-rich holey few-layer carbon nitride nanosheets with large domain size for superior photocatalytic hydrogen evolution
Abstract Ultrathin graphitic carbon nitride (CN) nanosheets, especially large-size holey few-layer materials have attracted great attention but are rarely reported in the phocatalysis field. Hence, an uncomplicated vopor-polymerization strategy is used to obtain a novel sample of carbon-rich holey few-layer CN nanosheet with large domain size (S-ACN) using the oxygen in-situ regulation. Interestingly, the same preparation strategy synthesizes the carbon-rich amorphous hollow-cubic CN materials (S-NCN) without the oxygen in-situ regulation. Consequently, the optimized S-ACN exhibits marked improvement in photocatalytic hydrogen evolution, by nearly 21.8 times compared with the bulk CN (ACN). The carbon-rich S-ACN with few-layer structures and copious in-plane holes displays an excellent photocatalytic activity due to the unique structural advantages for the synergistic effect of light absorption, abundant active sites, and efficient separation of photoproduced electron-hole pairs. It is a green and facile strategy for the fabrication of large-size holey few-layer nanosheets for the other transformations including organic synthesis process, environmental remediation, and CO2 reduction.
#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...
Last. Yongping Zhang(SWU: Southwest University)H-Index: 9
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In this study, we fabricated porous fiber-like g-C3N4 photocatalysts by calcifying melamine to improve the photocatalytic hydrogen evolution performance via a facile supramolecular hydrogel approach. The as-prepared g-C3N4 microwire (MW(III)) photocatalysts significantly enhanced hydrogen production under solar irradiation (16.88 μmol h−1). The performances of photocatalysts fabricated from the same precursor via calcification improved with the increase in the crystallinity and the degree of pol...
Last. Xinchen Wang(FZU: Fuzhou University)H-Index: 130
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: Metal-free carbonitride(CN) semiconductors are appealing light-transducers for photocatalytic redox reactions owing to the unique band gap and stability. To harness solar energy efficiently, CN catalysts that are active over a wider range of the visible spectrum are desired. Now a photochemical approach has been used to prepare a new-type triazine-based CN structure. The obtained CN shows extraordinary light-harvesting characteristics, with suitable semiconductor-redox potentials. The light ab...
Last. Chaorong Li(ZSTU: Zhejiang Sci-Tech University)H-Index: 23
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Abstract The two dimensional(2D) Z-scheme AgCl/Ag/Ca/TiO 3 nano-heterojunction is synthesized via simple preparation of hydrothermal-chemical co-deposition method. The results of SEM, EDS, elemental mapping, XRD, TEM, XPS and Raman shift imply that the AgCl/Ag nanoparticles have deposited on the surfaces of CaTiO 3 nanosheets successfully. Compared with the unmodified samples, the photocatalytic activity of the as-prepared 2D AgCl/Ag/CaTiO 3 nano-heterojunction exhibits a remarkable enhancement ...
Gold (Au) plasmonic nanoparticles were grown evenly on monolayer graphitic carbon nitride (g-C 3 N 4 ) nanosheets via a facile oil-bath method. The photocatalytic activity of the Au/monolayer g-C 3 N 4 composites under visible light was evaluated by photocatalytic hydrogen evolution and environmental treatment. All of the Au/monolayer g-C 3 N 4 composites showed better photocatalytic performance than that of monolayer g-C 3 N 4 and the 1% Au/monolayer g-C 3 N 4 composite displayed the highest ph...
Last. Chunsheng Shi(TJU: Tianjin University)H-Index: 61
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Three-dimensional open porous graphitic carbon nitride with cyano groups (3D OPG-C3N4-CN) has been fabricated by a facile two-step process that combines NaCl-assisted freeze-drying with calcination. NaCl not only works as a template for the 3D open porous structure, but also facilitates the decomposition of g-C3N4 around 500 °C to some extent. Meanwhile, a moderate amount of cyano groups acting as electron capture centers are introduced at the edge of the 3D open porous g-C3N4 during the formati...
#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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Exploiting solar power for hydrogen production from seawater is a great challenge owing to the corrosive properties of seawater and inadequate visible-light conversion capabilities. Here we report an uncomplicated post-processing method to construct Ti3+ self-doped titanium–silicon material with corrosion resistance. This is a new experimental method to regulate the electrical, optical, and photocatalytic performances of titanium-containing photocatalysts in a controlled way. Moreover, we demons...
Last. Ji-Jun Zou(Ministry of Education)H-Index: 63
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Abstract Graphitic carbon nitride (g-C 3 N 4 ) has emerged as a promising photocatalyst, but poor charge separation and low surface area limit its activity. Here, we report a hydrothermal method to generate hydrogen bonded supramolecular complex via water-based homogeneous supramolecular assembly, which is a promising precursor to fabricate porous and oxygen-doped g-C 3 N 4 . The hydrothermal treatment provides a homogeneous environment for hydrolysis of melamine to produce cyanuric acid and rea...
#1Junwei Fu(WUT: Wuhan University of Technology)H-Index: 17
#2Jiaguo Yu(KAU: King Abdulaziz University)H-Index: 191
Last. Bei Cheng(WUT: Wuhan University of Technology)H-Index: 109
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Photocatalysis is considered as one of the promising routes to solve the energy and environmental crises by utilizing solar energy. Graphitic carbon nitride (g-C3N4) has attracted worldwide attention due to its visible-light activity, facile synthesis from low-cost materials, chemical stability, and unique layered structure. However, the pure g-C3N4 photocatalyst still suffers from its low separation efficiency of photogenerated charge carriers, which results in unsatisfactory photocatalytic act...
Abstract Efficient separation of hole-electron pair plays a crucial role in enhancing photocatalytic water splitting activity, which essentially requires a noble metal co-catalyst. Here we report that two-dimensional (2D) metallic 1T-MoS2 can exceed the performance of noble metal like Pt as a co-catalyst in assisting the photocatalytic hydrogen evolution over 2D semiconductor such as oxygenated monolayer graphitic carbon nitride (O-g-C3N4). The abundance of intrinsic active site for hydrogen evo...
Last. Liejin Guo(Xi'an Jiaotong University)H-Index: 87
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Abstract The bridging N atom in g-C3N4 structure plays a decisive role in photo-generated charge transfer because it usually confines photo-generated electrons and holes in each heptazine, thus leading to severe recombination. In this work, a kind of 2-aminoterephthalic acid-derived benzene ring group with rich π-electrons was considered to integrate with bridging N to break the above-mentioned confining effect. On the basis of density-functional theory calculations and experimental analysis, th...
Last. Yong Sik Ok(KU: Korea University)H-Index: 104
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Abstract Antibiotics are widely present in the environment due to their extensive and long-term use in modern medicine. The presence and dispersal of these compounds in the environment lead to the dissemination of antibiotic residues, thereby seriously threatening human and ecosystem health. Thus, the effective management of antibiotic residues in water and the practical applications of the management methods are long-term matters of contention among academics. Particularly, photocatalysis has a...
Last. Guo-Jun Deng(XTU: Xiangtan University)H-Index: 3
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Abstract Graphite carbon nitride (CN) has recently become a promising photocatalyst while challenges still remain due to insufficient visible-light capture and poor electronic property. Herein, a porous ultrathin 2D CN@graphene@CN sandwich structure (5GO-CN) was prepared through in-situ local thermal oxygen erosion strategy. The inner graphene substantially accelerates the migration and separation of photogenerated charge carriers. Moreover, a small amount of oxygen-containing groups in inner gr...
Abstract 2D organic g-C3N4 photocatalysts are low cost materials with facile fabrication, suitable bandgap, tunable functionalization, excellent thermal/chemical-physical stability and exceptional photocatalytic behavior, raising considerable interest in photocatalytic and redox research areas. The photocatalytic performance of g-C3N4 mostly relies on the separation/transfer of photo-generated carriers. The mobility properties of the carrier largely determine the formation of reactive species, w...
Abstract As a typical metal-free photocatalyst, graphitic carbon nitride (g-C3N4) has attracted great attention for photocatalytic degradation of various organic pollutants. In this study, three-dimensional (3-D) phosphorus (P)-doped porous g-C3N4 nanosheets were prepared successfully via the thermal oxidation and element doping associated method. Abundant in-plane mesopores (from 2 nm to 50 nm), high specific surface area (202.9 cm2 g−1) and desirable P content (0.87%) were obtained for this 3-...
Ponceau 4R is successfully oxidized on the hetero-system ZnCo2O4/ZnO under the solar light. The spinel with a nano-morphology is elaborated by the sol gel method at ~ 850 °C. The X-ray diffraction pattern exhibits narrow peak characteristics that reveals a good crystallization. The capacitance−2–potential (C−2–E) plot of the semiconductor ZnCo2O4 indicates p type behavior from which a flat band potential of + 0.30 VSCE is determined. The energy band diagram, built from the physic-chemical proper...
#1Gang Dong(China University of Geosciences)H-Index: 3
#2Peng Qiu(China University of Geosciences)H-Index: 2
Last. Zhen Li(China University of Geosciences (Wuhan))H-Index: 97
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Abstract The notorious rapid recombination of photoinduced electron-hole limits the further application of polymeric carbon nitride (PCN) based photocatalysts. Face-to-face heterojunction composed of dissimilar 2D nanomaterials has been explored as a feasible way to facilitate the charge separation of PCN at the atomically well-defined hetero-interface. However, the conventional exfoliation-assembling process is tedious and time-consuming. Herein, a 2D/2D face-to-face heterojunction (MCN) has be...
Abstract Simultaneously regulate energy band structure and efficient injection rich-π-electrons to achieving high photocatalytic H2 evolution (PHE) activity are highly desirable. Herein, the C-substitution for N to the formation of C C in ultrathin g-C3N4 was prepared by urea and π-electron-rich 2-Aminopyrimidine copolymerization. DFT theory calculations and experimental results exhibit that introduction of C C into ultrathin g-C3N4 not only narrows its band gap from 2.7 eV to 2.48 eV and produc...