CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Shikang Yin,Linlin Sun,Yaju Zhou,Xin Li,Jinze Li,Xianghai Song,Pengwei Huo,Huiqin Wang,Yongsheng Yan
The use of semiconductor photocatalytic reduction technology has higher efficiency and lower energy consumption for CO 2 reduction, but its existence of some mismatched energy band positions and relatively slow charge-hole separation greatly limits its practical application. In this paper, a SnS 2 /Au/g-C 3 N 4 embedded structure model with carbon and nitrogen hybridization is proposed to gain an in-depth understanding of the role of hybridization and precious metal modification in photocatalysis. Carriers were investigated from the perspective of kinetics through photocurrent, LSV curve, and FL spectroscopy. After modification of Au nanoparticles, the photo-excited electrons showed a slower decay process, indicating that the separation of carriers was enhanced, which was further confirmed by impedance and PL spectroscopy. SEM, AFM and TEM analysis confirmed that the 2D face-to-face SnS 2 /Au/g-C 3 N 4 embedded structure was successfully prepared and the Au nanoparticles were evenly distributed. Au nanoparticles not only act as a bridge for electron transport in 2D semiconductor materials to accelerate electron transport, but generate more excited electrons by themselves under the radiation of sunlight, which effectively improves the separation efficiency of electron-hole pairs and enhances the photocatalyst activity. DFT calculations show that the Z-type mechanism and the intercalated energy level of the SnS 2 /Au/g-C 3 N 4 embedded structure expand the light absorption and improve the carrier separation efficiency. As expected, the photocatalyst activity with CO and CH 4 the evolution rate of up 93.81 µmol·g −1 ·h −1 and 74.98 µmol·g −1 ·h −1 under visible light irradiation, respectively, while the photocatalytic activity is negligible loss after 30 h photoreduction. This work reveals the role of embedded structure and precious metal modification in the separation and transmission of electron-hole, opening up new perspective for achieving high-efficiency solar CO 2 reduction performance.
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ELECTROCHIMICA ACTA
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2020
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IF 6.215
Yong Zuo,Xijun Xu,Chaoqi Zhang,Junshan Li,Ruifeng Du,Xiang Wang,Xu Han,Jordi Arbiol,Jordi Llorca,Jun Liu,Andreu Cabot
Tin disulfide is a promising anode material for Li-ion batteries (LIB) owing to its high theoretical capacity and the abundance of its composing elements. However, bare SnS 2 suffers from low electrical conductivity and large volume expansion, which results in poor rate performance and cycling stability. Herein, we present a solution-based strategy to grow SnS 2 nanostructures within a matrix of porous g-C 3 N 4 (CN) and high electrical conductivity graphite plates (GPs). We test the resulting nanocomposite as anode in LIBs. First, SnS 2 nanostructures with different geometries are tested, to find out that thin SnS 2 nanoplates (SnS 2 -NPLs) provide the highest performances. Such SnS 2 -NPLs, incorporated into hierarchical SnS 2 /CN/GP nanocomposites, display excellent rate capabilities (536.5 mA h g −1 at 2.0 A g −1 ) and an outstanding stability (∼99.7% retention after 400 cycles), which are partially associated with a high pseudocapacitance contribution (88.8% at 1.0 mV s −1 ). The excellent electrochemical properties of these nanocomposites are ascribed to the synergy created between the three nanocomposite components: i) thin SnS 2 -NPLs provide a large surface for rapid Li-ion intercalation and a proper geometry to stand volume expansions during lithiation/delithiation cycles; ii) porous CN prevents SnS 2 -NPLs aggregation, habilitates efficient channels for Li-ion diffusion and buffer stresses associated to SnS 2 volume changes; and iii) conductive GPs allow an efficient charge transport.
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APPLIED SURFACE SCIENCE
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2020
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IF 6.182
Siyuan Li,Yi Jiang,Wenchao Jiang,Yu Zhang,Kai Pan,Song Wang,Chongyang Hu,Lu-Hua Zhang,Lixin Xia
Constructing a heterojunction photoelectrode is an effective way to promote the photogenerated charge separation in photoelectrochemical (PEC) water oxidation. In this work, we successfully fabricated C 3 N 4 /BiVO 4 hybrid electrodes by integrating g-C 3 N 4 onto the nanoporous BiVO 4 via a simple in-situ synthesis method. The as-prepared C 3 N 4 /BiVO 4 photoanodes were systematically studied by Electrochemical Impedance Spectroscopy, steady-state surface photovoltage (SPV), transient SPV, Open circuit potential and Photoluminescence measurements. With an optimal loading of g-C 3 N 4 , the 2-C 3 N 4 /BiVO 4 electrode showed a high photocurrent density of 4.06 mA/cm 2 at 1.23 V (vs. RHE) for water oxidation, a 2.8 times enhancement over that of the BiVO 4 . It is found that g-C 3 N 4 improved the PEC performance of the photoanodes by simultaneously promoting the charge separation and surface reaction kinetics. When a NiOOH co-catalyst was immobilized onto the 2-C 3 N 4 /BiVO 4 electrode, both the PEC property and stability of the photoanode were enhanced. An extremely high photocurrent density of 5.44 mA/cm 2 at 1.23 V was achieved. The largest half-cell solar energy conversion efficiency for NiOOH/2-C 3 N 4 /BiVO 4 was 1.43% at 0.78 V, corresponding to 8.4 times that of unmodified BiVO 4 (0.17% at 0.97 V). This work brings new insight into the development of C 3 N 4 -based devices for application in solar to fuel conversion.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Feihui Li,Ruiru Zhao,Bingye Yang,Wei Wang,Yu Liu,Jianping Gao,Yunlan Gong
Nowadays, energy shortage is one of the major problems in the world. Photocatalytic hydrogen production is a new type of energy technology with good application prospect. As a new type of photocatalytic semiconductor material, g-C 3 N 4 has attracted much attention as a photocatalyst . By ultrasonic treatment of a mixed solution of g-C 3 N 4 and bovine serum albumin, followed by adding a certain amount of silver nitrate solution and then directly hydrothermal treatment , a special dandelion-like g-C 3 N 4 /Ag (D-g-C 3 N 4 /Ag) was prepared. The scanning electronic microscopy, transmission electronic microscopy , X-ray diffraction, Fourier transform infrared, fluorescence and physicochemical adsorption methods were used to characterize the morphology and structure of D-g-C 3 N 4 /Ag. In addition, the photocatalytic H 2 production of D-g-C 3 N 4 /Ag with different Ag loadings or in different sacrificial agents and different pH conditions were investigated. The results indicated that when triethanolamine was used as sacrificial agent, photocatalytic hydrogen efficiency was the best, and the rate of photocatalytic hydrogen production reached 862 μmol g −1 h − 1 as the Ag loading was 4%.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Puhui Deng,Mengxiang Gan,Xue Zhang,Zhuzhu Li,Yu Hou
The use of non-noble-metal to replace precious metal as co-catalyst in solar-driven hydrogen evolution reaction (HER) is important for lowering hydrogen production cost. In this work, nickel metal nanoparticles loaded nitrogen-doped graphite carbon nitride (NiNCN3) was prepared, which significantly enhanced the HER activity of nitrogen-doped graphite carbon nitride. The hydrogen evolution rate of NiNCN3 can reach to 1507 μmol g −1 h −1 , much higher than that of 3 wt % Pt/NCN (1055 μmol g −1 h −1 ). The distinguished photocatalytic performance is due to the accelerated electron transfer efficiency and inhibited photogenerated electron-hole recombination. Our study offers an alternative method to achieve the low-cost and effective noble-metal-free photocatalyst for HER.
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Yujie Li,Lei Ding,Yichen Guo,Zhangqian Liang,Hongzhi Cui,Jian Tian
The big challenging issues in photocatalytic H2 evolution are efficient separation of the photoinduced carriers, the stability of the catalyst, enhancing quantum efficiency, and requiring photoinduced electrons to enrich on photocatalysts’ surface. Herein, Ti3C2 MXene quantum dots (QDs) possess the activity of Pt as a co-catalyst in promoting the photocatalytic H2 evolution to form heterostructures with g-C3N4 nanosheets (NSs) (denoted g-C3N4@Ti3C2 QDs). The photocatalytic H2 evolution rate of g-C3N4@Ti3C2 QD composites with an optimized Ti3C2 QD loading amounts (100 mL) is nearly 26, 3 and 10 times higher than pristine g-C3N4 NSs, Pt/g-C3N4, and Ti3C2 MXene sheet/g-C3N4, respectively. The Ti3C2 QDs increase the specific surface area of g-C3N4 and boost the density of the active site. Besides, metallic Ti3C2 QDs possess excellent electronic conductivity, causing the improvement of carrier transfer efficiency.
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PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
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IF 3.42
Chunlin Chen,Yi He,Guoqing Xiao,Fei Zhong,Yunqing Xia,Youqing Wu
The application of graphene (Gr) in waterborne coatings is restricted owing to its strong hydrophobic properties. Herein, graphitic (g)-C 3 N 4 , also with good barrier properties, has been used for the first time to disperse Gr in epoxy solution via simple ultrasonic vibration. The morphologies and structures of g-C 3 N 4 and Gr/g-C 3 N 4 were characterized through FT-IR, XRD, XPS, UV–vis absorption spectra, TEM and Raman spectra. Corrosion resistance performances of the g-C 3 N 4 /epoxy and Gr/g-C 3 N 4 /epoxy nanocomposites coatings were evaluated by electrochemical impedance spectroscopy (EIS) and salt spray tests. Gr/g-C 3 N 4 /epoxy nanocomposites coating exhibits improved anti-corrosion performance in contrast to g-C 3 N 4 /epoxy coating due to enhanced barrier performances.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jing Wang,Min Yue,Yuze Han,Xing Xu,Qinyan Yue,Shiping Xu
The g-C 3 N 4 /MnFe 2 O 4 as recyclable catalyst was synthesized via auto-combustion sol-gel method. Peroxymonosulfate (PMS) activation by the catalyst for triclosan (TCS) degradation was investigated considering the activation performance, reaction parameters and activation mechanism. The catalyst prepared with 1:1 of g-C 3 N 4 and MnFe 2 O 4 molar ratio performed the best catalytic activity in the TCS degradation and with lest metal leaching. The concentration of Cl − showed a dual effect on the TCS degradation, while HCO 3 − and SO 4 2− performed inhibitory effect. Sulfate radicals, hydroxyl radicals, superoxide and non-radical single oxygen contributed to the degradation of TCS. Compared with MnFe 2 O 4 /PMS system, few heavy metals were leached from g-C 3 N 4 /MnFe 2 O 4 (1:1)-PMS after each reuse ( Fig. S6 b), suggesting that g-C 3 N 4 was conducive to the stability of g-C 3 N 4 /MnFe 2 O 4 (1:1) catalyst. Dichlorination, hydroxylation, cyclization and other bond breaking reaction were inferred as the TCS degradation pathways. These results demonstrated that g-C 3 N 4 /MnFe 2 O 4 (1:1) was a highly effective and stable catalyst for PMS activation to treat toxic organic pollutants in water.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Hongtao Wang,Jihao Bai,Meng Dai,Kunpeng Liu,Yueying Liu,Linsheng Zhou,Fengmin Liu,Fangmeng Liu,Yuan Gao,Xu Yan,Lu Geyu
In this work, 2D/2D ZnO/g-C 3 N 4 heterojunction composite was synthesized through an ultrasonic mixing and subsequent calcination process. The gas-sensing performance to NO 2 was investigated at room temperature activated by visible/ultra-violet LED light sources. Noticeably, when ZnO/g-C 3 N 4 composite is illuminated by 460 nm light, it exhibits the highest response of 44.8 to 7 ppm NO 2 , and the response and recovery time is 142 and 190 s, respectively. Furthermore, it possesses excellent repeatability and selectivity to NO 2 , and the limit of detection is 38 ppb. In addition, the effect of humidity on the sensing performance under visible light was also investigated. The excellent gas-sensing performance is attributed to the absorbance of g-C 3 N 4 in the visible light region and the charge separation at the interface between ZnO and g-C 3 N 4 .
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Electronic Materials Letters
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2022
·Vol. 19
·期 1
·94-107
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IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
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Journal of Water Process Engineering
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2023
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IF 7
Haixia Lyu,Wenzhang Zhu,Kaixuan Chen,Jun Gao,Zenghong Xie
Three dimensions (3D) flower-shaped g-C 3 N 4 /MoS 2 composite was prepared by immobilizing molybdenum disulfide (MoS 2 ) on carbon nitride (C 3 N 4 ) with structural defects by in-situ hydrothermal assay. The morphological structure and photochemical properties of the obtained catalysts were characterized by SEM, TEM , EDS, FTIR , XRD and XPS. Using methylene blue (MB) as the target pollutant, the photocatalytic performance cyclic stability of g-C 3 N 4 /MoS 2 composite were studied under simulated sunlight. The results showed that the prepared catalyst could remove 98 % of MB within 60 min and still reached 96.4 % after 5 cycles with good stability and regeneration. Its apparent rate constant was 0.0523 min −1 , which was 11.5, 8.2 and 13.9 times higher than those of g-C 3 N 4 (0.00453 min −1 ), C 3 N 4 with structural defects (0.00635 min −1 ) and MoS 2 (0.00377 min −1 ), indicating that the synergistic effect of structural defects, heterojunctions and 3D structure has achieved efficient degradation of MB. Furthermore, the photocatalytic mechanism of g-C 3 N 4 /MoS 2 composite was proposed by combining free radical capture experiment and electron paramagnetic resonance (EPR) spectroscopy and the results showed that that ·OH and ·O 2 - played a primary role in the catalytic degradation.
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CATALYSIS LETTERS
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2023
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IF 2.8
Chen Feng,Jiao Peixin,Zhao Caixian
Single-atom photocatalysts exhibit outstanding performance in energy and environmental photocatalysis, due to their exceptional capabilities in enhancing light-harvesting, charge transfer dynamics, and surface reactions. The key to preparing single-atom photocatalysts lies in developing an appropriate metal-support that can prevent aggregation or sintering during synthetic procedures. In this work, a Co(II)-urea complexe in-situ formed in melamine was employed as single-atom Co precursors to synthesize an efficient single-atom Co decorated P doped g-C 3 N 4 (Co/PCN) photocatalyst. The high-angle annular dark field transmission electron microscope (HAADF-TEM) results indicated abundant Co single atoms were immobilized in the g-C 3 N 4 matrix. Under visible-light irradiation, the as-prepared photocatalysts show remarkably enhanced photocatalytic performance. Especially, loaded with 1.5 wt% single atoms Co, the optimized Co/PCN exhibits H 2 evolution of 892.5 µmol g −1 h −1 , which is 33 times higher than that of PCN, and even twice as much as that of Pt-loaded g-C 3 N 4 (Pt/PCN). The enhanced photocatalytic activity is ascribed to the synergistic effect between single-atom Co and P doping, which facilitates efficient light harvesting, charge separation, and migration. It is believed that this study paves a new avenue for developing high-efficiency single-atom photocatalysts. Graphical Abstract
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