JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2022
·Vol. 106
·期 2
·444-454
·
IF 2.606
Zhang Ji,Mu Chengfa,Shen Tao,Qi Gengxin
Different micro-structured SnO 2 powders were synthesized by hydrothermal and chemical co-precipitation methods. The influence of milling process and sintering parameters on the physical properties of Ag/SnO 2 electrical contact materials was investigated. The microstructure and physical properties of Ag/SnO 2 electrical contact materials were characterized by X-ray Diffraction, Scanning Electron Microscopy and Conductivity analyzer. The results showed that spherical SnO 2 (s) powders with a diameter about 2 μm were synthesized. With increased milling time, there was a slight decrease in the average sizes of Ag/SnO 2 (s) powders, but no significant difference. The optimal density of 9.545 g∙cm −3 and resistivity of 2.67 μΩ∙cm of Ag/SnO 2 (s) electrical contact materials were obtained after sintering at 860 °C for 6 h in air atmosphere. The promotion of sintering densification and improvement of physical properties of Ag/SnO 2 (s) contact may be due to the combined effects of mechanical activation energy and higher sintering temperature. Using the finite element method, simulation models were developed to interpret the effects of different micro-structured SnO 2 powders on the physical properties of Ag/SnO 2 materials.
Graphical abstract
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Haihong Yin,Zhirun Qian,Yunfeng Wu,Zhipeng Chen,Fuzhi Wang,Tingting Chen,Bocheng Su,Kangwei Wen,Haijian Chen,Zhenguo Wang,Lin Qin
Lithium-sulfur batteries (LSBs) provide high capacity and energy density for advanced energy storage but encounter performance and safety issues due to lithium polysulfides (LiPSs) dissolution and dendrite formation. This study introduces a dual-functional SnO 2 -CNT-PANI||PP=|SnO 2 separator (DF-SNCPS) aimed at improving the stability and safety of LSBs. The separator includes a SnO 2 -CNT-PANI layer on the sulfur cathode side for enhanced electrical conductivity and polysulfide adsorption and a SnO 2 nanoparticle (nano-SnO 2 ) layer on the lithium anode side to regulate lithium-ion concentration and inhibit dendrite growth. Density functional theory (DFT) and the phase field method have verified the relevant material's catalytic performance and dendrite suppression ability. These methods have provided a comprehensive understanding of the underlying mechanisms, providing auxiliary explanations for their role in catalyzing polysulfide conversion and suppressing lithium dendrite growth. This innovative design mitigates the shuttle effect and enhances cyclic stability and sulfur utilization, achieving a notable cyclic performance with a capacity retention of 0.05 % per cycle over 800 cycles at 1 C. The synergistic effects of the modified separator present a viable pathway for LSB commercialization.
研究领域:
材料科学
·
能源存储
·
电池技术
·
纳米技术
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Hang Liu,Bing Liu,Peihua Li,Wenlong Kang,Yuhong Zhang
In this paper, the SnO 2 and Ce/SnO 2 nanomaterials are synthesized through a simple hydrothermal route and used for detecting NO 2 gas . The SnO 2 materials exhibit a good linearity for NO 2 detection, and the limit of detection is calculated to be as low as about 5 ppb at 10% humidity. The humidity dependence of the gas sensing characteristics of metal oxide semiconductors has been one of the greatest obstacles for gas sensor applications . The NO 2 gas sensing response of SnO 2 and Ce/SnO 2 also are investigated at 50% humidity. The Ce/SnO 2 materials show higher response than pure SnO 2 . The gas sensing mechanism of Ce/SnO 2 material is discussed in detailed. The reach results provide a new way for increasing the anti-humidity of the metal oxide semiconductor gas sensor.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yongying Wang,Yangge Guo,Zhengwei Zhang,Zirui Wu,Chanez Maouche,Shuiyun Shen,Yi Li,Junliang Zhang,Juan Yang
Designing catalysts with high activity and stability to boost their ethanol oxidation reaction (EOR) performance is one of the central targets in the development of direct ethanol fuel cells (DEFCs). However, how to design the EOR catalysts in a rational way is still challenging, needing more efforts put in. Herein, we have synthesized a catalyst of PtCu-SnO 2 aerogel via ingeniously introducing Cu into Pt-SnO 2 system, resulting in the formation of a main phase of alloy (PtCu)-amorphous oxide (a-SnO 2 ) interface. Benefiting from the optimized structures, the PtCu-SnO 2 aerogel displays excellent acidic EOR performance with 4.5 times promotion in activity compared to pure Pt aerogel. In-depth investigations through electrochemical in-situ Fourier transform infrared spectroscopy and density functional theory calculations have shown that the absorbed OH on a-SnO 2 surface together with the greatly-modified electronic structure of the alloy surface atoms can facilitate the C1 pathway and the oxidation of *CO intermediates for ethanol oxidation reaction. The resulting affinity of surface OH and the modification of reaction energies both in turn contribute to the improvement of EOR performance with high activity, stability, and anti-poisoning ability, proving interfacial engineering an effective strategy for the rational design of EOR catalyst.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 119
·98500-98507
·
IF 3.84
Yunshi Liu,Ping Yang,Jia Li,Katarzyna Matras-Postolek,Yunlong Yue,Baibiao Huang
SnO2 and SnO2/CeO2 one dimensional (1D) nanostructures with various morphologies including solid nanofibers (NFs), nanobelts (NBs), nanotubes (NTs), and wire-in-tubes (WTs) were successfully prepared via a single-spinneret electrospinning process and a subsequent heat-treatment by adjusting the heating rate and the amount of CeO2. The interesting morphology evolution of samples from NTs to NBs was reported with increasing amounts of CeO2. In addition, SnO2 particles existed on the surface of the CeO2 matrix to form diverse structures in the 1D nanofibers. The band gap of the composite oxides decreased with the addition of CeO2. Compared with other nanostructures, SnO2/CeO2 NTs exhibited superior gas sensing properties, such as the highest response to ethanol. Due to the existence of Ce3+ and oxygen vacancies and the hollow structure, SnO2/CeO2 NTs revealed great CO oxidation performance, indicating the enhanced interactions between the catalyst and the target gas. These excellent properties were attributed to the prominent 1D hollow morphology, the good dispersion of SnO2 nanoparticles on the surface of the CeO2 matrix, the ideal crystallinity, and the composite interactions between the two oxides. In addition, the current method could be utilizable to fabricate other metal oxides with various morphologies for property controlling and important applications.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 11
·1-19
·
IF 2.8
Wang Lu,Zhou Ying-Hua,Liu Xiaoheng
Carbon fibers’ textile (CFT)-based flexible electrodes containing a large number of SnO 2 nanospheres and V 2 O 5 /SnO 2 nanoparticles were obtained by a facile one-pot template method. The homogeneously distributed SnO 2 and V 2 O 5 /SnO 2 exhibit an optimized worm-like mesoporous skeleton and an ideal pore size distribution with a highest surface area of around 295.5 m 2 ·g −1 and 198.0 m 2 ·g −1 , respectively. Using the mesoporous transition/mixed transition metal oxide nanomaterials simultaneously as both positive and negative electrodes, a solid-state flexible asymmetric supercapacitor was fabricated with the V 2 O 5 /SnO 2 @CFT as the positive electrode and SnO 2 @CFT as the negative electrode with well-widened voltage windows. Benefiting from the 3D controllable mesoporous architecture of electroactive species, the assembled supercapacitors delivered a high specific capacitance of 151.3 F·g −1 at 1 A·g −1 , and good rate stability with 70.9% capacitance retention at a higher current density of 5 A·g −1 . Notably, the device can operate in a wide voltage window (0~1.6 V), which enhance substantially the energy density to 193.6 Wh·kg −1 at a power density of 2880 W·kg −1 . These encouraging results are expected to open up a possibility of designing and fabricating the other metal oxide nanomaterials with mesoporous structure and uniform morphology for high-performance supercapacitors and other energy storage devices application.
研究领域:
材料科学
·
纳米技术
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·Vol. 113
·期 3
·942-951
·
IF 3.2
Du Tianheng,Jin Liguo
This study thoroughly investigates the effects of different solvent engineering strategies on the structure and properties of SnO 2 electron transport layers (ETLs) and evaluates their performance-enhancing effects on carbon-based all-inorganic CsPbIBr 2 perovskite solar cells (PSCs). By comparing the SnO 2 ETLs prepared with ethanol (ET-SnO 2 ) and isopropanol (IPA-SnO 2 ) solvents and constructing corresponding CsPbIBr 2 PSCs devices, we comprehensively analysed the structure, morphology, wettability, light transmittance and electronic transport properties of the SnO 2 ETLs using characterization methods such as XRD, SEM, contact angle measurement, transmission spectroscopy, steady-state fluorescence spectroscopy and electrochemical impedance spectroscopy. Combined with the J-V characteristics of the device, we revealed the mechanism of the effect of solvent engineering on the performance of PSCs. The results showed that IPA-SnO 2 exhibited better performance with lower contact angle and higher compactness, which is conducive to electron transport and reduces interfacial defects. IPA-SnO 2 also promoted the growth of CsPbIBr 2 crystals, forming larger and denser crystal structures and reducing pinhole defects. In addition, IPA-SnO 2 improves the light transmittance of the FTO substrate and the light absorption of the CsPbIBr 2 film, thereby increasing the light trapping efficiency. Finally, the IPA-SnO 2 -based PSCs achieved a PCE of 5.95%, an improvement of 25% compared to ET-SnO 2 , demonstrating good application prospects. This study provides an important experimental basis for optimizing the preparation process of SnO 2 ETL and improving the performance of carbon-based CsPbIBr 2 PSCs. Graphical
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·908
·
IF 5.3
Renjun Si,Yan Li,Jie Tian,Changshu Tan,Shaofeng Chen,Ming Lei,Feng Xie,Xin Guo,Shunping Zhang
In this work, we studied the influence of cross-interference effects between VOCs and NO on the performance of SnO2and Pt-SnO2-based gas sensors. Sensing films were fabricated by screen printing. The results show that the response of the SnO2sensors to NO under air is higher than that of Pt-SnO2, but the response to VOCs is lower than that of Pt-SnO2. The Pt-SnO2sensor was significantly more responsive to VOCs in the NO background than in air. In the traditional single-component gas test, the pure SnO2sensor showed good selectivity to VOCs and NO at 300 °C and 150 °C, respectively. Loading noble metal Pt improved the sensitivity to VOCs at high temperature, but also significantly increased the interference to NO sensitivity at low temperature. The explanation for this phenomenon is that the noble metal Pt can catalyze the reaction between NO and VOCs to generate more O−, which further promotes the adsorption of VOCs. Therefore, selectivity cannot be simply determined by single-component gas testing alone. Mutual interference between mixed gases needs to be taken into account.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yufang Li,Yangchun Feng,Hang Bai,Jinsong Liu,Dayuan Hu,Jiyu Fan,Honglie Shen
In recent years, large and small industries have discharged a multitude of organic pollutants into the environment, causing environmental pollution. Titanium dioxide (TiO 2 ) materials is very important photocatalyst as a result of its outstanding applications to remove organic contaminants from the environment. Nonetheless, the low utilization rate of visible light of TiO 2 has limited its application. To begin with, Black TiO 2 is produced by the magnesium thermal reduction method to promote the absorption of visible light, Subsequently, The black TiO 2 /SnO 2 composites are synthesized by chemical synthesis method to form a hetero-junction to augment the photocatalytic activity. The morphology, chemical composition, phase structure and photocatalytic degradation of Rhodamine B (RhB) under visible light irradiation were investigated. The morphological properties demonstrated that a Ti 3+ self-doped disorder layer forms on the surface of TiO 2 nanophase, and black TiO 2 nanoparticles are well decorated with SnO 2 nanoparticles. After 90 min of visible light irradiation, RhB has a photocatalytic degradation efficiency of 96.62%, which is 1.597 times that of TiO 2 nanoparticles, and its cycle stability is well beyond our expectation. The ameliorated photocatalytic degradation performance of TiO 2 /SnO 2 composite is ascribed to the formation of a "type Ⅱ heterojunction", which not only reinforces the absorption of visible light of black TiO 2 /SnO 2 nanoparticles, but also heightens the separation and transfer efficiency of the photogenerated carriers.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Ding Wang,Kechuang Wan,Minglu Zhang,Huijun Li,Ping Wang,Xianying Wang,Junhe Yang
SnO 2 nanofiber/nanosheets with hierarchical nanostructures were successfully synthesized via a facile hydrothermal method by using hollow SnO 2 nanofibers as the backbone. The microstructure, morphology, chemical composition, oxidation states and surface areas of SnO 2 nanofibers, SnO 2 nanofiber/nanosheets and SnO 2 nanosheets were comparatively studied by X-ray diffraction (XRD), Field emission scanning electron microscopy (FE-SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET). The characterization results indicated that the hierarchical SnO 2 nanofiber/nanosheets were constructed by nanosheets arrays uniform growth on the surface of nanofibers. Sensing performances of SnO 2 -based nanomaterials were investigated utilizing formaldehyde (HCHO) as a target gas. Compared to SnO 2 nanofibers, nanosheets and the physical mixture of nanofibers and nanosheets, the gas sensor based on SnO 2 nanofiber/nanosheets exhibited better response, more excellent selectivity, transient response and trace detection ability to HCHO gas. The response (R a /R g ) of the gas sensor is 57 toward 100 ppm HCHO at 120 °C, which is about 300% and 200% higher than that of pure SnO 2 nanofibers sensors and SnO 2 nanosheets sensors, respectively. Furthermore, the sensor has an excellent response/recovery performance with 4.7 s and 11.6 s for detecting 100 ppm HCHO. Both the growth process and the gas sensing mechanism of SnO 2 hierarchical nanostructures were discussed. Successful preparation of SnO 2 nanofiber/nanosheets is attributed to uniform decoration of seeds on the nanofibers and suitable growth conditions of nanosheets. Enhanced sensing performance mainly result from the synergistic effect of nanofibers and nanosheets, hierarchical structures and larger specific surface areas. The synthetic strategy can also be applied in preparing hierarchical materials of different constituent materials.
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Weiqi Wang,Jiamu Cao,Rongji Zhang,Huaxin Xiu,Yufeng Zhang
Although SnO2 nanomaterials have been leading components of semiconductor gas sensors, their long-standing challenges of high working temperatures limit their practical application for ultralow-power-consumption room-temperature sensing. In this study, Au and Pt bimetallic nanoparticles were used to fabricate a MoS2/AuPt/SnO2 nanocomposite device by interfacially engineering a MoS2/SnO2 nanostructure. Owing to the unique structure and electrical properties, the as-fabricated MoS2/AuPt/SnO2 device exhibits a remarkable sensing response (2.22), short response time (20 s), and excellent baseline recovery (8 s) to 10 ppm NO2 gas at 23 ± 2 °C. Meanwhile, the MoS2/AuPt/SnO2 device possesses high sensitivity, a low detection limit (20 ppb), commendable reversibility, appreciable stability, and excellent selectivity against ammonia, carbon monoxide, ethanol, isopropanol, and acetone gases. The superior sensing characteristics of the MoS2/AuPt/SnO2 nanocomposite device are attributed to the modulation effect of the Schottky junction and p–n heterojunction on the potential barrier, highly efficient interfacial electron transport, and edge-enriched structure, which provide abundant active adsorption sites. This work will advance the evolution of room-temperature gas-sensitive nanomaterials and render them promising for applications in ultralow power-integrated sensors.
研究领域:
材料科学
·
纳米技术
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sufaid Shah,Shahid Hussain,Salah Ud Din,Abdulnasser M. Karami,You Tianyan,Mingsong Wang,Guiwu Liu,Guanjun Qiao
The current study, accurately designed and created a two-dimensional (2D) structure of SnO 2 nano-flowers and In 2 O 3 nanoparticles using a simple hydrothermal technique and sol-gel method, respectively. On the outer surface of SnO 2 nanoflowers the In 2 O 3 nanoparticles were uniformly growing, clearly revealed by field emission scanning electron microscopic. Besides, crystal phase structure, surface area and elementals composition were characterized by XRD, BET, TEM, EDS, XPS and the gas sensing properties of In 2 O 3 @SnO 2 NFs. The results exhibited that 2 wt% In 2 O 3 @SnO 2 NFs sensor is highly sensitive to NO 2 , the response (R g /R a ) to 30 ppm NO 2 is 94.5, and at 50 ppb the response measured 0.61 at 150 °C, the response time is 32 and 51s, respectively, along with good moisture resistance. Besides along with excellent selectivity, long-term stability, and relative humidity (RH) in high-humidity environment, the 2 wt% In 2 O 3 @SnO 2 NFs still maintain high response 91 at 30 ppm. More importantly, at room temperature the response was (Rg/Ra = 1.01) at detection limit 300 ppb towards NO 2 , which could use be for trace NO 2 gas detection. The large specific surface areas of SnO 2 , the abundance of oxygen species adsorbed on the surface, the distinctive electron transformation between heterojunction materials, and high electron transmission channel of SnO 2 and In 2 O 3 transition layer were all considered to have a synergistic effect thatin2 contributed to excellent sensing properties of In 2 O 3 @SnO 2 NFs.
研究领域:
材料科学
·
环境监测
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）