RSC Advances
·
2017
·Vol. 7
·期 21
·12446-12454
·
IF 3.108
Hui Zhang,Rong Wu,Hong Xu,Fan Li,Shuo Wang,Jinshu Wang,Tingting Zhang
This paper reports first on the novel synthesis of hierarchical tin dioxide (SnO2) porous microspheres in the absence of a template using a simple spray reaction technique and annealing at 500–800 °C. The SnO2 microspheres obtained are tetragonal phase and approximately 2.2–2.7 μm in diameter, and they consist of 6.7–23.1 nm crystallites and possess hierarchical pores and Brunauer–Emmett–Teller (BET) surface areas of up to 55 m2 g−1. Using ultraviolet-visible absorption spectra analysis, it is found that SnO2 crystallites demonstrate a quantum size effect, resulting in a widening of the band gap of the SnO2 spheres. This band gap can be tuned from 3.99 eV (800 °C) to 4.26 eV (600 °C) by varying the annealing temperature. Using separated SnO2 porous spheres as the scattering layer of the photoanode for dye sensitized solar cells (DSSCs), the solar light-electricity conversion efficiency (maximum: 6.0%) is increased by up to 31.9% and 28.2% compared to cells using a commercial SnO2 powder and P25 nanopowder as the scattering layers, respectively, under the same conditions.
研究领域:
材料科学
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能源技术
·
纳米科技
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2021
·
IF 4.094
Juan Wang,Dong Zhang
The design of high comprehensive properties structural supercapacitors requires advanced electrode materials with suitable porous structure for ion diffusion , as well as unique solid electrolyte owning excellent mechanical property under high-pressure compression. Herein, we presented a novel structural supercapacitor cell constructed by graphene-coated nickel foam decorated with SnO 2 electrode and PAM–Portland cement electrolyte. It was found that the RGO/SnO 2 -1 electrode displays superior electrochemical performance with the highest areal capacitance of 0.374 F cm −2 at the current density of 1 mA cm −2 , good cycle stability, and capacitance retention rate can reach 80.4% after 1000 cycles. Polymer-inorganic cement electrolyte was prepared by synchronous reaction at room temperature. The resulting structural supercapacitor cell showed relatively high electrochemical and mechanical properties . The areal capacitance was as high as 61.0 mF cm −2 at the current density of 0.1 mA cm −2 . The excellent electrochemical performance combined with high mechanical comprehensive properties makes it a promising candidate in civil engineering applications.
研究领域:
材料科学
·
电化学工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yaqing Zhang,Zhimin Yang,Liang Zhao,Yunpeng Xing,Congcong Xin,Zefeng Wei,Teng Fei,Sen Liu,Tong Zhang
Reduced graphene oxides (RGO)-based materials exhibit high carrier mobility and selective recognition ability to NO 2 , making them constitute promising platform for room-temperature NO 2 detection. However, the low sensitivity becomes the main bottleneck for their further development. Here, we demonstrate that synergy of Pd nanoparticles (NPs) and oxygen vacancies can modulate the surface active sites over SnO 2 NPs modified RGO hybrids (labeled as SR), leading to improving the sensitivity of room-temperature NO 2 sensors. Experimentally, a wet-chemical method was used to introduce oxygen vacancies onto SR, leading to forming SR with rich oxygen vacancies (labeled as SR-Vo), which were subsequently deposited with Pd NPs, resulting in preparing Pd NPs loaded SR-Vo hybrids (labeled as Pd-SR-Vo). Impressively, the response value to 1 ppm NO 2 of Pd-SR-Vo hybrids reaches to 9.8, which is much higher than that of R-Vo hybrids (5.6) and SR hybrids (3.3). The improvement of sensitivity toward NO 2 for Pd-SR-Vo hybrids is attributed to the synergy effect of Pd NPs and oxygen vacancies, including shortening the band gap of Pd-SR-Vo hybrids with raising conduction band level, widening the width of electron depletion layer between SnO 2 -Vo and RGO, introducing Schottky contact between Pd and SnO 2 -Vo, improving efficiency for gas sensing reaction. This work not only provides an efficient approach to fabricate high-performance NO 2 sensors, but also opens a new avenue for sensing materials design and modification.
研究领域:
材料科学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Miao Lu,Siyuan Zhang,Zhongmei Song,Liang Ma,Haining Liu,Ming Fang,Huifang Zhang,Xiushen Ye,Zhijian Wu
Increased levels of octadecylamine (ODA) and 4-dodecylmorpholine (DMP) in the aqueous, primarily utilized as flotation agents in the worldwide production of potash fertilizer, imperil the stability of ecosystems and the downstream production of high-end chemicals. Nevertheless, there is a dearth of exhaustive studies pertaining to the elimination of ODA and DMP. Herein, the Ti/SnO 2 -Sb/β-PbO 2 anode was fabricated by a thermal decomposition-electrodeposition technique for the electrocatalytic degradation of ODA and DMP. The degradation efficiency of ODA and DMP can achieve complete degradation, reaching 100%, after treatment periods of 10 min and 120 min, respectively. Meanwhile, the TOC removal efficiency of ODA and DMP is up to 85% and 61% at 30 min and 120 min, respectively. In particular, sulphate exhibits inhibitory degradation activity of ODA and DMP in comparison to chloride salt. The recycling and accelerated lifetime tests indicate excellent stability and recyclability of the Ti/SnO 2 -Sb/β-PbO 2 electrode. The mechanism of electrocatalytic degradation involves indirect electrochemical oxidation mediated by free radicals. The primary reactive species responsible for the degradation of DMP and ODA, as determined through scavenger quenching experiments and ESR, are ·OH and Cl·. The degradation of the ODA and DMP commences with the elimination of N element, leading to the formation of the N O 3 - . The carbon chain subsequently undergoes the breakdown. The degradation pathways of ODA and DMP were also proposed based on the GC–MS and H-NMR analyses, respectively. Moreover, the Ti/SnO 2 -Sb/β-PbO 2 anode performed excellently in the removal of ODA and DMP in real samples, TOC removal from ODA and DMP in natural samples was 56% and 52%, respectively, within 180 min. This study provides the first exploration of electrocatalytic degradation mechanisms and pathways of ODA and DMP based on the Ti/SnO 2 -Sb/β-PbO 2 anode.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Ziying Wang,Tong Zhang,Tianyi Han,Teng Fei,Sen Liu,Geyu Lu
In this paper, SnO 2 nanoparticles (NPs) decorated reduced graphene oxide hybrids with abundant vacancies (designated as SnO 2 -RGO-OVs) have been successfully prepared by a combined hydrothermal synthesis and chemical solution deposition method. It is found that high density SnO 2 NPs with the size of 3–5 nm are uniformly distributed on the surface of RGO nanosheets. Most importantly, SnO 2 -RGO-OVs hybrids exhibit excellent room-temperature NO 2 sensing properties with the low detection limit of 50 ppb. When SnO 2 -RGO-OVs-based sensor was exposed to 1 ppm NO 2 , the response is 3.80 and response time and recovery time are 14 s and 190 s, respectively. These sensing performances are superior to those of most reported room-temperature NO 2 sensors based on RGO-based materials and other materials. The excellent sensing performances of SnO 2 -RGO-OVs hybrids can be attributed to their specific structure, e.g., RGO that could facilitate transferring carriers during sensing progress, and abundant OVs that could facilitate adsorption of more NO 2 molecules onto SnO 2 NPs in SnO 2 -RGO-OVs hybrids.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Zhaopeng Li,Hongye Qin,Kunjie Zhu,Pei Liu,Xuchun Chen,Xiaotian Wang,Haixia Li,Lifang Jiao
Although tremendous efforts have been dedicated to promote the electrochemical stability of sodium metal batteries (SMBs), the uncontrollable dendrites growth and inevitable side reactions at the sodium (Na) anode/electrolyte interface have not been effectively resolved. In this work, a flexible and functionalized 3D framework with mesoporous SnO2 nanosheet arrays (SnO2@CC-12) is fabricated to serve as a sodiophilic matrix toward dendrite-free Na metal anode. The mesoporous SnO2 nanosheet arrays provide abundant sodiophilic sites and sufficient internal voids, which can not only accelerate electron transport to reduce the local current density of Na anode surface but also manipulate the Na+ flux deposition to suppress the growth of Na dendrites. Therefore, the SnO2@CC-12-Na symmetric cell exhibits an ultralow overpotential of 9 mV and superior Na plating/stripping stability over 2200 h at 1.0 mA cm–2. Moreover, the full cells using Na3V2(PO4)3 cathode show favorable high-rate performance and impressive long cycling stability with 95.1% capacity retention over 1000 cycles at 500 mA g–1. This work may provide a new insight into the design of functionalized interface layer with high sodiophilicity toward dendrite-free SMBs.
研究领域:
电化学
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材料科学
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能源存储
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纳米材料
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界面工程
✓ 已验证
DOI
高影响因子
ENVIRONMENT INTERNATIONAL
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2021
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IF 9.621
Chao Yang,Yiang Fan,Shanshan Shang,Pu Li,Xiao-yan Li
Electrochemical oxidation (ECO) is an appealing technology for treating emerging organic pollutants in wastewater. However, the conventional flow-by ECO process is expensive with a low energy efficiency owing to the limitations of mass transport of contaminants to the limited surface area of the anode. In this study, a novel freestanding porous and permeable SnO 2 -Sb anode was fabricated by one-step sintering using micrometer-sized (NH 4 ) 2 CO 3 grains as the pore-forming agents. This permeable SnO 2 -Sb anode without Ti substrate functioned as a reactive anodic filter (RAF) in an ECO cell to treat wastewater containing ciprofloxacin (CIP). Forcing the wastewater through the porous RAF depth-wise improved the mass transport and vastly enlarged the electroactive surface area. Compared with the conventional flow-by configuration, the flow-through RAF exhibited a 12-fold increase in the mass transfer rate constant (60.7 × 10 −6 m s −1 ) and a 5-fold increase in the CIP degradation rate constant (0.077 min −1 ). At a cell potential of 4.0 V, more than 92% of the CIP was degraded in a single-pass operation at a filtration flux of 54 L m −2 h −1 and a short retention time of 1.7 min through the RAF. The robustness and stability of the RAF were demonstrated by its remarkable CIP degradation efficacy of 99% during 200 h of operation. The mechanism of CIP degradation was examined using probe molecules and density functional theory calculations and found to be a combined effect of direct electron transfer and oxidation by generated radicals ( OH and SO 4 − ). The great potential of RAF in flow-through ECO was further validated by its effective removal (>92%) of various organic pollutants in actual municipal wastewater at a low energy consumption of 0.33 kWh m −3 . The RAF-based ECO process thus provides an advanced environmental technology for the oxidation of toxic and recalcitrant organic pollutants in wastewater treatment.
研究领域:
环境工程
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化学工程
·
水处理
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·143503
·
IF 3.721
Yijie Liu,Xianzhe Meng,Chao Li,Yifan Gong,Juan Wang,Jiang Bo
Non-biodegradable pharmaceuticals are a group of emerging contaminants that have gained much attention because of their potential risk of inducing adverse ecological and health effects. An efficient Ti/SnO2-Sb2O5-IrO2-RuO2 electrode was prepared by Pechini method and employed as the anode for electrochemical degradation of selected pharmaceuticals (i.e., ibuprofen, atenolol, and carbamazepine). Compared its counterparts, Ti/SnO2-Sb2O5-IrO2-RuO2 exhibited higher oxygen evolution potential, lower chlorine evolution potential, larger active area, and higher stability. Unlike the negligible effect of solution pH from 4.0 to 10.0, increasing current density favored the target pollutants and COD removal. The removal of IBU was mainly attributed to the reaction with •OH, the contribution of which to IBU removal was enhanced with increasing current density. In contrast to IBU, the removal of ATEN and CBZ was mainly ascribed to the reaction with selective radical chlorine species (RCS) mainly in the form of Cl•, which was produced from direct oxidation of Cl− or indirect oxidation by •OH. It was found that the removal of ATEN and CBZ was less affected by dissolved organic matter (DOM) than that of IBU in municipal effluent. This study demonstrates that Ti/SnO2-Sb-RuO2-IrO2 is an attractive electrode for the destruction of pharmaceutical contaminants.
研究领域:
环境科学
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电化学工程
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污染控制
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Weining Liu,Xi Tan,Mingyang Zhao,Zhao Liu,Hairong Li
Triethylamine (TEA) is a highly toxic and flammable volatile organic compound (VOC) that poses serious risks to both human health and environmental safety. Thus, the development of highly sensitive gas sensors for its trace-level detection is of pressing importance. In this work, SnO 2 /TiO 2 heterostructures were synthesized via an in-situ thermal transformation of Sn-MOF/MXene precursors. The derived materials benefit from the inherent high porosity and large specific surface area of MOF-based frameworks, as well as the tightly coupled heterointerface formed under the modulation of MXene, efficiently facilitating charge separation and transport, while TEA interacts more readily with active sites due to the richness of surface defects, thereby greatly boosting TEA adsorption and sensing response. The optimized MST-2 sensor exhibits an ultrahigh response of 3525.2 to 10 ppm TEA at a notably low operating temperature of 61 °C, along with excellent selectivity and good stability. Even at an ultralow TEA concentration of 10 ppb, the sensor maintains a strong response of 44.6. Furthermore, the adsorption characteristics of individual phases, interfacial charge transfer processes, and TEA adsorption enhanced mechanisms were systematically examined through density functional theory (DFT) calculations. The effective MOF/MXene-derived co-construction strategy offers a promising avenue for designing advanced TEA sensing materials.
研究领域:
材料科学
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纳米技术
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传感器
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Jiaping Tang,Cuiying Dai,Ze Wen,Mei Yang,Hongbin Gao,Weiguo Mao,Zhuo Wang,Junan Pan,Yong Pan
SnO 2 /Gr composite as anode material for lithium-ion batteries was synthesized by an acoustic-chemical method followed by an annealing treatment. The composite exhibits high crystallinity and purity, and the weight ratio of SnO 2 is controllable. Benefit from the compound effect between material components, the SnO 2 /Gr anodes give notable reaction kinetics and cycling stability. The specific capacity of the composite with 27.4 wt% SnO 2 remains 649.9 mA h g −1 after 170 cycles at 200 mA g −1 . The strain field features in the symmetrical SnO 2 /Gr electrodes were in-situ measured during electrochemical cycles by digital image correlation technique . The distribution and variation characterizations of diffusion induced stress in the symmetrical SnO 2 /Gr electrodes were obtained by using mechano-electrochemical coupling constitutive equation. Furthermore, the contributions of the electrochemical and mechanical stress parts to the plane stress in the symmetrical SnO 2 /Gr electrodes also be discussed, respectively. The results and analytical method are critical for further revealing the failure mechanism and optimizing architecture of the SnO 2 /Gr electrodes for lithium-ion batteries.
研究领域:
材料科学
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电化学
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电池技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Shuang Li,Zhuo Liu,Lin Yang,Mengli Yan,Yan Xu
Oxygen vacancy defects on the surface of metal oxides can not only increase carrier density and facilitate electron transfer, but also increase more active sites, thereby significantly boosting the overall performance of sensors. In this study, a 3D bundle-like porous CeO 2 -SnO 2 heterostructure with abundant oxygen vacancy defects composed of radially cross-bundled mesoporous nanorods is successfully prepared. The synergistic effects of composition regulation, Ce 4+ /Ce 3+ valence engineering, and increased oxygen vacancy defects in the micro-nano structure enhance electron transfer at the interface, creating more active sites for triethylamine (TEA) capture. Consequently, the micro-nano structure shows an outstanding response value of 151.12 towards 100 ppm TEA at 157 °C, about six times higher than SnO 2 , with excellent selectivity, fast response/recovery times (9 s/123 s), superior anti-interference ability, and long-term stability. Also, the sensor can achieve a response value of 11.24 for TEA detection in gases from five-day-stored crucian carp at room temperature, showing potential for freshness monitoring. This work presents an effective strategy to develop TEA sensors for practical applications by using oxygen valence engineering and tailoring multi-scale pore structures in MOF-derived heterostructures.
研究领域:
材料科学
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传感器技术
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食品安全
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纳米科技
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表面化学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 12
·1895-1902
·
IF 3.382
Bojia Xu,Baobao Cao
Wrapping SnO2 nanowires with appropriate oxide shell materials could produce a significant impact on their photoelectrical and gas sensing performance. In this work, a novel highly crystalline SnO2/Zn2SnO4 core–shell nanowire has been fabricated using a sequential chemical vapor deposition (CVD) method. Cross-sectional transmission electron microscopy (TEM) reveals that the SnO2 core is surrounded by five or six Zn2SnO4 domains, displaying a characteristic quasi-hexagonal cross section. Extensive crystallographic orientation study shows that the growth direction of the core is along the SnO2 [101] direction, parallel to that of the shell Zn2SnO4 [101], i.e. SnO2 [101]∥Zn2SnO4 [101]. While the Zn2SnO4 outer shells have two crystallographic relationships between the SnO2 core, SnO2 (10)∥Zn2SnO4 (13) and SnO2 (020)∥Zn2SnO4 (1), one group of the domains sticks to the SnO2 {111} plane and the other group grows on the SnO2 {020} plane. All the Zn2SnO4 shell domains expose their {111} plane as the ending surface. The tetragonal SnO2 core growing along the [101] direction makes it nearly invisible when collecting electron diffraction from the side view of the core–shell nanowire. The geometrical model deduced from cross-sectional TEM results suggests that there is only one low index zone axis for the core nanowire, i.e. SnO2 [010], along which Moiré fringes and the very rarely seen multiple double-diffraction effect were observed and discussed in detail. We would like to call the attention of researchers to be careful in correlating the microstructure of core–shell nanowires with their physical properties, because merely observing from the radial direction might not be able to reveal the true interface structure.
研究领域:
材料科学
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纳米技术
·
晶体学
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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）