CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiapeng Xu,Chaoqiang Liu,Lijuan Fu,Qingyu Liu,Seeram Ramakrishna,Wei Tang
In this work, CuO nanosheets are synthesized by one-step hydrothermal method and CuO/WS 2 heterostructures are fabricated by introducing CuO doping into WS 2 , the preparation method was employed to enhance the performance of the gas sensor. The CuO/WS 2 heterostructure nanocomposite sensor, doped with 5 % CuO, exhibited a pronounced enhancement in its response to 30 ppm of ammonia gas at ambient temperature, increasing the response value from 3.8 observed in pure WS 2 -based sensors to 4.7. Specifically, the response time of the CuO/WS 2 heterostructure-based gas sensor decreased to 180 s, whereas the WS 2 -based sensor required 350 s for NH 3 detection at room temperature. Furthermore, the CuO/WS 2 sensor demonstrated outstanding selectivity for ammonia, maintaining stability over a 90-day test with a response fluctuation of less than 5 %. The heterojunction formed by CuO and WS 2 showed superior sensitivity to NH 3 compared to pristine WS 2 , owing to a notable enhancement in the surface catalytic effect. It also displayed sensitivity to humidity, with a response value of 6.25 at a 71 % relative humidity. At last, the gas sensing and enhanced gas sensing performance mechanisms of the composites for NH 3 were elucidated. This remarkable multi-functional performance offers valuable insights for the advancement of room temperature gas sensors with diverse sensing functionalities.
研究领域:
材料科学
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传感器技术
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产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 11
·927
·
IF 3.444
Aiguo Han,Mei Li,Shengbo Zhang,Xinli Zhu,Jinyu Han,Qingfeng Ge,Hua Wang
In recent years, defective TiO2-based composite nanomaterials have received much attention in the field of photocatalysis. In this work, TiB2was used as a precursor to successfully prepare Ti3+defective TiO2(TiO2-B) with a truncated bipyramidal structure by a one-step method. Then, the SnS2nanosheets were assembled onto the as-prepared TiO2-B through simple hydrothermal reaction. TiO2-B exhibits strong visible light absorption properties, but the recombination rate of the photo-generated electron-hole pair was high and does not exhibit ideal photocatalytic performance. Upon introducing SnS2, the heterojunction catalyst SnS2-Ti3+defective TiO2(SnS2/TiO2-B) not only possesses the strong light absorption from UV to visible light region, the lowest photo-generated charge recombination rate but also achieves a more negative conduction band potential than the reduction potential of CO2to CO, and thereby, exhibits the significantly enhanced selectivity and yield of CO in photocatalytic CO2reduction. Notably, SnS2/TiO2-B produces CO at a rate of 58 µmol·h−1·g−1with CO selectivity of 96.3% under visible light irradiation, which is 2 and 19 times greater than those of alone TiO2-B and SnS2, respectively. Finally, a plausible photocatalytic mechanism on SnS2/TiO2-B was proposed that the electron transfer between TiO2and SnS2follows the Z-scheme mode. Our results present an effective way to gain highly efficient TiO2based photocatalysts for CO2reduction by combining different modification methods of TiO2and make full use of the synergistic effects.Keywords:photocatalytic CO2reduction;TiO2nanoplates;SnS2nanosheets;Ti3+defective TiO2
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hongshan Wang,Zhenzhen He,Qiangbin Yang,Guangyong Zeng,Zhaomei Yang,Shengyan Pu
MXene nanosheets were functionalized by introducing sodium lignosulfonate (LS) containing abundant hydrophilic groups (sulfonic acid groups and phenolic hydroxyl groups), along with the intercalation of MoS 2 nanosheets between the functionalized MXene layers. A pressure-assisted self-assembly was utilized for the fabrication of a two-dimensional (2D) MXene membrane with high water permeation and excellent dye separation characteristics. The MoS 2 @LS-MXene composite membrane has excellent pure water flux (188.1 L·m -2 ·h -1 ), which is 85% higher than that of the unfunctionalized MXene membrane, and has a good rejection effect on dye molecules (93% for Congo red (CR), and 99% for Rhodamine B (RhB)). The appropriate interlayer spacing and negative surface charge resulted low rejection of salts (4.2% of NaCl, 4.6% of Na 2 SO 4 ) in dye-salt hybrid system, consequently leading to their mutual separation. The composite membrane also exhibits excellent stability and anti-fouling ability. This study provides a simple and novel design idea for the preparation of high-performance 2D MXene membrane.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 53
·期 11
·8141-8150
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IF 2.993
Zhou Qianqian,Li Ting-Ting,Xu Wei,Zhu Hong-Lin,Zheng Yue-Qing
Integration of water oxidation catalysts on conductive support without polymer binder is an appealing strategy to improve the catalytic activity for electrochemical oxygen evolution reaction. Herein, the hierarchical CuO dandelion-like materials assembled from numerous ultrathin nanosheets are directly grown on Cu foil to produce a 3D oxygen evolution anode (CuO NSDs/CF). As a result of its integrated configuration and high electrocatalytic active sites, the anode exhibits superior electrocatalytic water oxidation activity in 1.0 M NaOH solution, associated with a small overpotential of 370 mV at 10 mA cm −2 and a low Tafel slope of 41 mV dec −1 . Furthermore, the anode can maintain a relatively stable current density at 1.65 V versus RHE for at least 24 h, and a high Faradaic efficiency of 98% is also achieved.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 6
·2619-2628
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IF 8.867
Yuzhen Zhu,Zaixiang Xu,Wenya Jiang,Shuxian Zhong,Leihong Zhao,Song Bai
The utilization of a metal cocatalyst is a promising route to improve the solar-to-chemical conversion efficiency of semiconductor-based photocatalysts. The efficiency of the improvement is greatly dependent on the architectural structure of the metal cocatalysts, especially the catalytically active sites on the surface of the cocatalysts. In this article, Pd nanosheets with different sizes have been hybridized with TiO2 nanosheets to disclose how the edge of Pd cocatalysts influences the photocatalytic performance of TiO2–Pd hybrid structures in the reduction of CO2 to fuels. It was found that the highest photocatalytic activity was realized by small Pd nanosheets with the highest edge density on the TiO2 nanosheets. The reason is that the edges of the nanosheets act as the highly active sites for the CO2 reduction reaction. To further verify the edge-dependent photocatalytic performance, Pd nanorings were also deposited on the TiO2 nanosheets, which further improve the photocatalytic activity as compared with original nanosheets resulting from the additional edge sites exposed on the side of the hollow interior in the rings. This work underlines the importance in the edge engineering on the surface of cocatalysts in realizing high-performance photocatalytic applications.
研究领域:
材料科学
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能源化学
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环境科学
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产品关联
DOI
高影响因子
Sensors & Diagnostics
·
2023
·
IF 0
Zeyi Wang,Yuping Li,Jian Zhang,Xiao Huang
As a piezoelectric ceramic material, SeZnO3 has received increasing attention for pressure sensing. However, the poor conductivity and low dielectric constant of bare SeZnO3 severely limit its wide applications. Herein, to improve the pressure sensing properties of SeZnO3, SeZnO3 nanosheets composited with Ag nanoplates were synthesized via a dissolution coprecipitation method, which exhibited a higher sensitivity (54.8 kPa−1) to external pressure with an excellent repeatability than that of bare SeZnO3 nanosheets (12.3 kPa−1). The enhanced pressure sensing properties of Ag/SeZnO3 nanocomposites could be attributed to an increased dielectric constant and an enhanced charge output. Moreover, the nanocomposite-based pressure sensors showed an accelerated response/recovery rate (0.7 s/2.7 s) because of the effective charge transfer between SnZnO3 and Ag, which was confirmed by XPS results. This Ag/SeZnO3 composite nanosheet-based pressure sensor demonstrates a potential for practical monitoring of human movement.
研究领域:
材料科学
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电子工程
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DOI
NANOTECHNOLOGY
·
2025
·Vol. 36
·期 18
·185401
·
IF 2.8
Chen Zhang,Ruipeng Hou,Shufang Chang,Rong Wu,Shunhang Wei
Cocatalysts generally serve as active sites accelerating carrier separation. However, when the hydrophilicity of photocatalyst itself is poor, the trapped electrons or holes on cocatalysts are difficult to react with reactants quickly. In this work, Bi4Ti3O12 nanosheets with excellent hydrophilicity was prepared and then thermally deposited Rh on their surface (Bi4Ti3O12(Rh)), and finally in-suit grew ZnIn2S4 on the surface of Bi4Ti3O12(Rh). Based on the results of photocatalytic performance and materials characterization, it was found that the Bi4Ti3O12(Rh) in the photocatalytic system could be considered as a special cocatalyst rather than formed heterojunction with the ZnIn2S4. Under visible-light irradiation, the Rh acted as an electron trapping site to conduct photogenerated electrons trapping from ZnIn2S4 to the surface of Bi4Ti3O12. This process not only further accelerated carrier separation, but also facilitated electrons reacting with water due to the excellent hydrophilicity of Bi4Ti3O12(Rh), thereby achieving enhanced photocatalytic H2 production performance in the absence of sacrificial agents.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2020
·
IF 8.247
Wenwu Fu,Yaoting Li,Mao-sung Chen,Yanjie Hu,Bingheng Liu,Kai Zhang,Chenyang Zhan,Ming Zhang,Zhongrong Shen
Poor rate capability and cyclability are the major barriers to using TiO 2 as the next generation anode material for high-performance lithium-ion batteries. In this study, a sandwich-like composite consisting of atomically defined two-dimensional (2D) carbon nanosheet is constructed by the confined synthesis in the galleries of layered TiO 2 nanosheet with the superior cycling and rate performances as the anode material for lithium-ion batteries. It is first experimentally revealed that the interfacial charge storage between unilamellar TiO 2 nanosheet and carbon nanosheet in the Carbon/TiO 2 nanosheet stack and the excellent structure stability during the discharge/charge process contribute to the superior performance of the composites. The resultant composite exhibits a high specific capacity (568 mAh g −1 ) with a specific energy of 407.4 Wh kg −1 at a specific power of 71.7 W kg −1 , and remains 88.0 Wh kg −1 at a specific power of 9.0 kW kg −1 . Apart from promising lithium-ion battery anode, this 2D Carbon/TiO 2 composite also has immense potential for applications in other areas such as sodium/potassium-ion batteries, supercapacitor , and catalysis.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2020
·
IF 3.693
Li Wenhui,Wei Xijun,Dong Hongmei,Ou Yingqing,Xiao Shenghuan,Yang Yang,Xiao Peng,Zhang Yunhuai
Layered NbS2, a member of group-V transition metal dichalcogenides, was synthesized via a colloidal synthesis method and employed as a negative material for a supercapacitor. The morphologies of NbS2 can be tuned from ultrathin nanosheets to hierarchical structures through dynamics controls based on growth mechanisms. Electrochemical energy storage measurements present that the ultrathin NbS2 electrode exhibits the highest rate capability due to having the largest electrochemical surface area and its efficient ion diffusion. Meanwhile, the hierarchical NbS2 shows the highest specific capacitance at low current densities for small charge transfer resistance, displays 221.4 F g−1 at 1 A g−1 and 117.1 F g−1 at 10 A g−1, and cycling stability with 78.9% of the initial specific capacitance after 10,000 cycles. The aggregate or stacking of nanosheets can be suppressed effectively by constructing hierarchical structure NbS2 nanosheets.
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2019
·Vol. 125
·期 1
·1-11
·
IF 1.784
Deng Senlin,Yang Zebin,Lv Guojun,Zhu Yongqiang,Li Haichao,Wang Fumin,Zhang Xubin
A novel WO 3 nanosheets (WO 3 NS)/g-C 3 N 4 Nanosheets’ (g-C 3 N 4 NS) nanocomposite photocatalyst was fabricated through a simple calcination process. WO 3 NS was first prepared with the aid of P123 lamellar micelles and g-C 3 N 4 NS was synthesized by two-step calcination process. The nanocomposite photocatalyst was characterized by X-ray powder diffraction, scanning electron microscopy, Fourier transform infrared spectrometry, UV–Vis diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence. The novel nanocomposite photocatalyst demonstrated higher photocatalytic activity for rhodamine B degradation than corresponding g-C 3 N 4 NS. 20 wt% WO 3 NS/g-C 3 N 4 NS showed the highest photocatalytic performance, which was 4.70 times higher than that of pure g-C 3 N 4 NS. The results confirmed that the incorporation of WO 3 NS could definitely accelerate the transfer of photogenerated electrons and effectively promote the separation of electrons and holes, thereby improving the photocatalytic efficiency. The trapping experiments proved that the mechanism of photocatalytic degradation may be rooted in the formation of Z-scheme system.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 64
·37355-37364
·
IF 3.049
Yun Chen,Wenge Qiu,Jiayuan Sun,Shining Li,Guangmei Bai,Shenghua Li,Chenghui Sun,Siping Pang
A reliable in situ self-generating template strategy has been developed for the synthesis of flowerlike carbon nanosheets by hydrothermal carbonization in the presence of both silica and zinc acetate using glucose as the carbon source. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), powder X-ray diffraction (XRD), Raman spectroscopy, nitrogen sorption isotherm measurement (BET) and element analysis revealed the morphology, crystal phase structure, porosity and chemical composition. The formation of the zinc silicate nanosheet template was due to the hydrolysis of amorphous silica and self-assembly under hydrothermal conditions. The resulting flowerlike carbon nanosheets proved to be an excellent palladium catalyst support.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ping Wang,Bin Guo,Huaxin Ma,Wenyu Wu,Zhao Zhang,Xiaojing Liu,Minghao Cui,Ruijun Zhang
Eco-friendly exfoliation of two-dimensional nanosheets from their layered bulks is very attracting but still remains a big challenge. Here, we report a novel preparation route of two-dimensional nanosheets through soaking the bulk layered material in the C 2 H 4 O 3 -based chemical exfoliation system followed by microwave irradiation. This route has demonstrated the effective exfoliation of two-dimensional nanosheets (graphene nanosheets, BNNS and MoS 2 NS) from their layered bulks in a green and eco-friendly way. The average layer-number of the obtained graphene nanosheets, BNNS and MoS 2 NS is 4, 6 and 5, respectively, behaving a few-layer feature. Interestingly, when the graphene paper is prepared from the exfoliated graphene nanosheets by simple vacuum filtration and mechanical pressing, its average electrical conductivity is up to 7.36 × 10 5 S/m and the EMI SE value reaches to 61 dB, both among the highest for the graphene papers reported previously. Since there exists no serious fragmentation of layered materials during the whole exfoliation, the present exfoliation strategy is more competent in preparing the large-sized two-dimensional nanosheets over those conventional green routes.
研究领域:
材料科学
·
纳米技术
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）