INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Shaodong Sun,Dong Ren,Man Yang,Jie Cui,Qing Yang,Shuhua Liang
Constructing direct Z-scheme heterostructure is an effective way to promote the separation of photogenerated carriers and optimize the redox ability of the photocatalytic system. This work reports the in-situ synthesis of sea-urchin-like ZnS/SnO 2 Z-scheme heterojunctions via a one-step hydrothermal method . Both experimental results and density functional theory (DFT) calculations indicate that the tight interfaces derived from in-situ precursor dissociation can ensure a fast transfer for photogenerated carriers, meanwhile, the Z-scheme type of heterojunctions can increase the carrier separation efficiency and maintain the high reduction ability of photogenerated electrons. As expected, the photocatalytic hydrogen evolution rate of the as-optimized ZnS/SnO 2 sample can reach 2.17 mmol g −1 h −1 , which is 15.5 times higher than that of the commercial ZnS. This work can offer a novel strategy for designing Z-scheme heterojunction as well as controlling the contact interface for boosted photocatalytic activity .
研究领域:
材料科学
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能源科学
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催化化学
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产品关联
DOI
高影响因子
Journal of Water Chemistry and Technology
·
2023
·Vol. 45
·期 2
·164-175
·
IF 0.6
Jing Meng,Geng Cong,Guan Yinyan,Gao Weichun,Ming Hao,Li Dan,Wang Nan,Liu Shiyue,Jiang Wei,Liang Jiyan,Wang Xueying
Abstract The sol-gel approach was utilized to make a copper-doped Ti/SnO 2 -Sb anode for electrochemical oxidation of norfloxacin (NOR). Sycanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), linear scan voltammograms (LSV), and cyclic voltammetry (CV) were used to examine the anode’s surface morphology and electrochemical characteristics. The results show that the doped metal makes the anode coating denser and smoother, which is more conducive to resistance to electrochemical corrosion. The electrochemical degradation of NOR utilizing the constructed anode was examined in relation to reaction circumstances such as current density, pH value, and initial NOR concentration. Within the selected range of reaction conditions, the removal rate of NOR using Ti/SnO 2 –Sb–Cu electrode was significantly higher than that of blank electrode. The following were the shifting trends: NOR removal efficiencies grew with applied current density and initial NOR concentration, and reduced with increasing pH value. Water samples with different reaction times were taken and tested by UV-Vis spectrum. As can be seen from the results, with the progress of the reaction, the intensity of the characteristic peak decreased, indicating that NOR is degraded gradually. The electrochemical degradation pathways of NOR were studied using liquid chromatography coupled with mass spectrometry (LC-MS). Six intermediates were detected and a possible reaction pathway for the degradation of NOR by electrochemical oxidation was proposed.
研究领域:
环境科学
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电化学工程
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DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 34
·23306-23313
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IF 3.3
Guohui Li,Pengyu Li,Zhi Ge,Dawei Yan,Wei Sun,Yuanyuan Sun,Xiaoxia Zhou
Photocatalytic conversion of carbon dioxide into fuels provides an effective approach to realize carbon resource utilization. However, the photocatalytic efficiency is still relatively low due to the recombination of photogenerated charges. Herein, we have designed Cu-doped SnO2 nanoparticles (Cu–SnO2) using a glucose-involved hydrothermal crystallization method for the photocatalytic reduction of CO2. The rich oxygen vacancies facilitated the separation and transfer of photogenerated charges, and the confined effect of the typical mesoporous structure promoted the adsorption of CO2, especially a high density of grain boundaries (GBs) and the doping of atomic Cu would introduce new active sites to activate CO2 molecules. This elaborately designed catalyst exhibited super and stable photocatalytic conversion activity of CO2-into-CO, with a CO optimal yield of 107 µmol g−1 in 4 h, which was 2.75 times that over pure SnO2. In situ Raman results indicated that the CO2 reduction reaction followed a *COOH pathway on Cu–SnO2. This work provides implications for the construction of a catalyst with rich defects in the field of energy and environmental catalysis.
研究领域:
材料科学
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环境催化
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能源化学
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产品关联
DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Zhang Quanquan,Li Xin,Wang Xingwang,Huang Xin,Liu Yuncai,Wu Fengshou,Zhang Bingguang,Deng Kejian
Photocatalysis has exhibited huge potential in selective conversion of glucose into value-added chemicals. Therefore, modulation of photocatalytic material for selective upgrading of glucose is significant. Here, we have investigated the insertion of different central metal ions, Fe, Co, Mn, and Zn, into porphyrazine loading with SnO2 for access to more efficient transformation of glucose into value-added organic acids in aqueous solution at mild reaction conditions. The best selectivity for organic acids containing glucaric acid, gluconic acid, and formic acid of 85.9% at 41.2% glucose conversion was attained by using the SnO2/CoPz composite after reacting for 3 h. The effects of central metal ions on surficial potential and related possible factors have been studied. Experimental results showed that the introduction of metalloporphyrazine with different central metal ions on the surface of SnO2 has a significant effect on the separation of photogenerated charges, changing the adsorption and desorption of glucose and products on the catalyst surface. The central metal ions of cobalt and iron contributed more to the positive effects toward enhancing conversion of glucose and yields of products, and manganese and zinc contributed more to the negative effects, resulting in the poor yield of products. The differences from the central metals may attribute to the surficial potential change of the composite and the coordination effects between the metal and oxygen atom. An appropriate surficial potential environment of the photocatalyst may achieve a better interactive relationship between the catalyst and reactant, while appropriate ability of producing active species matched with adsorption and desorption abilities would gain a better yield of products. These results have provided valued ideas for designing more efficient photocatalysts in selective oxidation of glucose utilizing clean solar energy in the future.
研究领域:
化学
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材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Daguang Li,Jiaxing Huang,Ruobai Li,Ping Chen,Danni Chen,Meixuan Cai,Haijin Liu,Yiping Feng,Wenying Lv,Guoguang Liu
As an emerging carbon nanomaterial, carbon dots (CDs) have superior prospects for applications in the area of photocatalysis due to their unique optical and electronic properties. In this study, a novel CDs modified g-C 3 N 4 /SnO 2 photocatalyst (CDs/g-C 3 N 4 / SnO 2 ) was successfully synthesized by the thermal polymerization. Under visible light irradiation, the resulting CDs/g-C 3 N 4 /SnO 2 photocatalyst exhibited excellent photocatalytic activity for the degradation of indomethacin (IDM). It was demonstrated that a 0.5 % loading content of CDs led to the highest IDM degradation rate, which was 5.62 times higher than that of pristine g-C 3 N 4 . This improved photocatalytic activity might have been attributed to the unique up-conversion photoluminescence (PL) properties and efficient charge separation capacities of the CDs. Moreover, the combination of g-C 3 N 4 with SnO 2 improved the separation of photoinduced carriers and augmented the specific surface area. Reactive species (RSs) scavenging experiments and electron spin resonance (ESR) revealed that superoxide radical anions (O 2 ·− ) and photogenerated holes (h + ) played critical roles during the photocatalytic process. The results of the detection of H 2 O 2 and ESR confirmed that CDs/g-C 3 N 4 / SnO 2 was a Z-scheme heterojunction photocatalyst. Further, HRAM LC–MS/MS was employed to identify the byproducts of IDM, and the major IDM degradation pathways of the CDs/g-C 3 N 4 /SnO 2 photocatalyst were proposed. This study provides new ideas for the design of novel CDs modified photocatalysts for environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CARBON
·
2023
·
IF 10.9
Zhangjie Qin,Zhaofeng Wu,Qihua Sun,Jun Sun,Min Zhang,Fengjuan Chen,Dongzhi Zhang,Changwu Lv,Haiming Duan
Inspired by the ordered tubular structure inside the dog nose and its olfactory receptors, this paper reports a biochar/SnO 2 composite based on waste disposable bamboo chopsticks (DBC) combined with tin dioxide (SnO 2 ) nanoparticles . The response of optimized biochar/SnO 2 composite reaches 4513 to 500 ppm NH 3 , and the response/recovery times are 50.4 s and 3.7 s, respectively. The biochar/SnO 2 composite displays the dog-nose-like ultra-fast response (1 s response up to 1100) to 500 ppm NH 3 at room temperature (25 °C), which makes the biochar/SnO 2 composite with the application promising for rapid detection of NH 3 . The optimized biochar/SnO 2 sensor also exhibits good selectivity and linear response with a theoretical detection limit as low as 34 ppb NH 3 . In addition, the biochar/SnO 2 sensor has reliable humidity immunity and long-term stability. Within a period of up to six months, the response fluctuation of biochar/SnO 2 sensor to 500 ppm NH 3 at 25 °C is less than 3.7%. However, the susceptibility of biochar/SnO 2 composite to the operating temperature need to be overcome. The biochar/SnO 2 composite was prepared by low-temperature pyrolytic carbonization (300 °C) with the advantages of abundant raw materials, low cost and green environmental protection, providing a new outlet for solid waste.
研究领域:
材料科学
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环境科学
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传感技术
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产品关联
DOI
高影响因子
iScience
·
2025
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IF 4.1
Qixin Chen,Zhongchen Bai,Xu Wang,Xishun Peng,Xinghua Li,Cheng Zuo,Zhengping Zhang
The electron transport layer (ETL) plays a crucial role in fabricating efficient and stable planar perovskite solar cells (PSCs). Among the various alternatives to TiO 2 for ETLs, tin oxide (SnO 2 ) has emerged as a highly promising candidate due to its outstanding potential. However, improvements in SnO 2 materials remain necessary due to inherent limitations such as low conductivity, high energy barrier, and interfacial defects. In this study, Mg 2+ ions were introduced into SnO 2 to substitute Sn sites, leading to an increase in the open-circuit voltage (V oc ) of perovskite solar cells, and consequently enhancing overall device efficiency. With a Mg doping concentration of 3.0%, the V oc and power conversion efficiency (PCE) of the solar cell reached 1.540 V and 7.17%, respectively. The incorporation of Mg 2+ ions into SnO 2 presents an effective method to improve the performance of SnO 2 ETL in perovskite solar cells while utilizing more environmentally friendly solvents.
研究领域:
材料科学
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纳米技术
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光伏技术
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固态电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Functional Materials Letters
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2020
·
IF 2
Dan Sun,Huixiao Guo,Yu Li,Haiying Li,Xiaosong Li,Chunxia Tian,Jianxia Zhang,Li Liu
This paper reports the preparation of 3D ordered porous SnO 2 with different diameters (103, 546, and 1030 nm) by a simple template method. We find that 103 nm porous SnO 2 nanomaterials have the highest response (30) and fastest response/recovery time (3/10 s) for 100 ppm HCHO (formaldehyde) compared with the response and response/recovery times for 546 nm (20 and 3/17 s, respectively) and 1030 nm (10 and 6/20 s, respectively) porous SnO 2 nanomaterials at a low working temperature (220 ∘ C). All three sensors show good long-term stability, repeatability, and linearity. The results show that decreasing the diameter of the porous SnO 2 materials effectively increased the gas sensitivity to HCHO. The increase in the gas sensitivity was attributed to the ordered porous structures, large specific surface area, and additional oxygen vacancies on the surface.
研究领域:
材料科学
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传感器
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mingtao Qiao,Yurui Tian,Jiaxin Li,Xiaowei He,Xingfeng Lei,Qiuyu Zhang,Mingliang Ma,Xiaorong Meng
Multiband-compatible stealth materials play an increasingly crucial role in the field of modern military defence because they can enable the targeted objects to dodge advance detection technologies. In this study, chain-like Fe 3 O 4 @poly(ethyleneglycol dimethacrylate- co -methacrylic acid) nanocomposites were constructed as precursors through the magnetic field-induced distillation precipitation polymerisation. Then, the liquid-phase seed-mediated growth method, together with subsequent calcination , was applied to introduce SnO 2 shells and remove poly(ethyleneglycol dimethacrylate- co -methacrylic acid) shells, which led to the successful preparation of innovative core–shell Fe 3 O 4 @SnO 2 nanochains. The unique microstructure and appropriate components endowed nanochains with multiple functional applications. The minimum reflection loss value was approximately −39.4 dB (5.67 GHz), exhibiting excellent microwave absorption performance. The possible microwave absorption mechanisms involve interfacial polarisation, space charge polarisation, natural resonance, and multiple reflections and scatterings. The optimal infrared reflectivity reached 0.64, 0.51, and 0.37 in three atmospheric windows, indicating outstanding infrared stealth performance, which was attributed to the intense infrared reflection of SnO 2 shells. Furthermore, three nanochains showed different colours (dark green, brick red, and bright orange), revealing selection absorption for visible light . This can be attributed to the combined effect of visible responses of SnO 2 shells along with Bragg diffraction from the periodic arrangement of Fe 3 O 4 particles in a single nanochain. Thus, core-shell Fe 3 O 4 @SnO 2 nanochains can be considered as promising radar-infrared-visible compatible stealth materials. This discovery opens a new means to exploit multiband-compatible stealth materials.
研究领域:
材料科学
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国防科技
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 6
·
IF 2.504
Haitong Tang,Xinru Yu,Shi Jin,Fanling Meng,Yan Yan,Zhongmin gao
Hierarchical carbon nanofibre (CNF)/SnO2/Ni nanostructures of graphitized carbon nanofibres and SnO2 nanocrystallines and Ni nanocrystallines have been prepared via divalent tin–alginate assembly on polyacrylonitrile (PAN) fibres, controlled pyrolysis and ball milling. Fabrication is implemented in three steps: (1) formation of a tin–alginate layer on PAN fibres by coating sodium alginate on PAN in a water medium followed by polycondensation in SnCl2 solution; (2) heat treatment at 450°C in a nitrogen atmosphere; (3) ball milling the mixture of CNF/SnO2 fibres and Ni powder. The CNF/SnO2/Ni nanocomposite exhibits good lithium ion storage capacity and cyclability, providing a facile and low-cost approach for the large-scale preparation of anode materials for lithium ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xinyu Hu,Juntao Wang,Jing Wang,Kehui Xue,Ting Yang,Yi Peng,Ying Yan,Hongbo Xiao,Wenlei Wang
Controlling the migration behavior of photogenerated carriers by designing the microstructure of materials remains a significant challenge. In this work, the solvothermal method was used to fabricate a SnO 2 /SnS 2 heterojunction anchored on biochar through −C Sn− bonds between biochar and SnS 2 , as demonstrated by X-ray photoelectron spectroscopy characterization. DFT calculations further confirmed −C Sn− bonds can shorten theoretical band gap of SnS 2 @biochar from 1.01 eV to 0.66 eV and provide a pathway for swift electron migration, which can effectively modulate the separation of photo-induced carriers and promote the generation of e − and h + . Additionally, the oxalate activated by −C Sn− bonds can effectively capture h + and produce abundant ∙CO 2 – free radicals. When the obtained composites were used as photocatalysts , Cr(VI) was thoroughly reduced by the SnO 2 /SnS 2 @biochar composite with a molar ratio of SnO 2 and SnS 2 of 2 within 20 min under visible light irradiation when oxalate was 1.0 mM (CSO-2/H 2 C 2 O 4 -1). Furthermore, CSO-2/H 2 C 2 O 4 -1 exhibited excellent reusability, and the degradation efficiency of Cr(VI) remained above 91.71% after five cycles. The remarkable photocatalytic properties can be ascribed to the synergistic effects of e − and ∙CO 2 – . This work proposes a new strategy for the preparation of an applied photocatalyst with a high separation rate of photoinduced 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
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Shahua Huang,Nasir Ali,Zhaoxiang Huai,Jingpeng Ren,Yansheng Sun,Xiaohui Zhao,Guangsheng Fu,Weiguang Kong,Shaopeng Yang
High-efficiency organic solar cells (OSCs) based on low-temperature (LT) processed SnO 2 electron transport layer (ETL) are promising for their commercial use. However, high density of traps and large contact barrier for carriers at the interface between LT SnO 2 and the active layer has been reported. To solve the problem, various interface modifying layer materials, such as PFN, has been introduced. Currently, the fabrication process of such interface modifying layer materials is complex and expensive. Herein, a facile strategy involved a polar solvent ethanolamine (EA) is introduced to modify LT SnO 2 surface. By soaking the SnO 2 film into EA solution in 2-Methoxyethanol (2-ME), EA can easily anchor into SnO 2 film surface and forms a continuous monomolecular layer via dehydration reaction. The whole process is green and highly compatible with a roll-to-roll process. Further study suggests that the deep trap centers on SnO 2 surface are substantially reduced and the built-in potential in OSCs is reinforced. Finally, OSCs based on EA-modified SnO 2 demonstrated an enhanced power conversion efficiency from 10.71% to 12.45% which was comparable to those based on ZnO (12.26%) under the same experiment parameters. Our work boosts the development of the inverted OSCs with easy fabrication and compatibility with roll-to-roll process.
研究领域:
材料科学
·
能源技术
✓ 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）