Journal of Materials Chemistry A
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2019
·Vol. 7
·期 10
·5635-5642
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IF 10.733
Lin Yang,Yohan Dall'Agnese,Kanit Hantanasirisakul,Christopher E. Shuck,Kathleen Maleski,Mohamed Alhabeb,Gang Chen,Yu Gao,Yoshitaka Sanehira,Ajay Kumar Jena,Liang Shen,Chunxiang Dall'Agnese,Xiao-Feng Wang,Yury Gogotsi,Tsutomu Miyasaka
MXenes, a class of two-dimensional (2D) transition metal carbides and nitrides, have a wide range of potential applications due to their unique electronic, optical, plasmonic, and other properties. Herein, we explore the use of the Ti3C2 MXene in organic–inorganic lead halide perovskite solar cells (PSCs). SnO2–Ti3C2 MXene nanocomposites with different contents of Ti3C2 (0, 0.5, 1.0, 2.0, and 2.5 wt‰) were used as electron transport layers (ETLs) in low-temperature processed planar-structured PSCs. Mixing SnO2 with 1.0 wt‰ Ti3C2 effectively increases the power conversion efficiency (PCE) from 17.23% to 18.34%, whereas the device prepared with pristine Ti3C2 as the ETL achieves a PCE of 5.28%. Photoluminescence and electrochemical impedance spectroscopy results reveal that metallic Ti3C2 MXene nanosheets provide superior charge transfer paths, enhancing electron extraction, electron mobility, and decreasing the electron transfer resistance at the ETL/perovskite interface, and thus leading to higher photocurrents. This work proposes a new field of application for MXenes and a promising method to increase the efficiency of solar cells.
研究领域:
材料科学
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能源技术
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纳米技术
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DOI
高影响因子
ACS ES&T Engineering
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2024
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IF 7.4
Hui-Wen Huo,Xiao-Qiong Wu,Jia-Fang Xie,Ding Li,Quan-Bao Zhao,Yu-Ming Zheng
Chemical oxygen demand (COD) indicates the relative content of organics in water. The electrochemical measurement of COD is a promising ecofriendly alternative method for rapidly, automatically, and highly accurately determining the content of organics in water. However, the key anodes must possess high catalytic efficiency and long-term stability, be easy to prepare, and be free of heavy metal leaching. Therefore, in this study, a SnO2–Sb-based porous anode was prepared using simple coating and calcination. Because of its porous, conductive, and robust Ti felt/Pt (TF/Pt) substrate, the anode (TF/Pt/SnO2–Sb) possessed stable current responses that were highly correlated (R2 = 0.999) with COD measurements in the range of 20–6000 mg L–1. The detection limit was 3.03 mg L–1 (at a signal-to-noise ratio of 3), and the relative standard deviation was within 3.2% (n = 10), which is superior to those of the standard dichromate detection method. The further assembly of a flow-through system with the proposed anode exhibited a wider linear range of up to 8000 mg L–1 at a lower sample injection volume of 50 μL. These results suggest the application potential of the electrochemical method with the porous TF/Pt/SnO2–Sb anode as a reliable alternative for sustainable COD determination.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Di Liu,Zilong Tang,Zhongtai Zhang
SnS 2 is a promising candidate for NO 2 sensing applications due to its suitable band gap and large electronegativity. However, SnS 2 based gas sensors are still restricted to detect NO 2 gas at room temperature due to their giant resistance and poor recovery. Here, we report hollow SnO 2 @SnS 2 nanostructures prepared by a one-step hydrothermal method. The SnO 2 @SnS 2 based sensor showed high response and good recovery to ppb-level NO 2 under visible illumination at room temperature (25 °C). The superior sensing performance of the SnO 2 @SnS 2 sensor was attributed to the hollow porous heterojunction structure beneficial for gas diffusion, as well as visible light assistant facilitating charge transfer and gas desorption. This work systematically studied the influence of oxygen concentration in background gas on the NO 2 sensing performance of the SnO 2 @SnS 2 sensor, and proposed a physical adsorption model for the NO 2 sensing mechanism of the SnO 2 @SnS 2 sensor under visible light at room temperature. In addition, the effect of humidity on the gas sensing performance of the SnO 2 @SnS 2 sensor to different concentrations of NO 2 was also discussed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Yangyang Yu,Yingming Zhu,Jing Guo,Hairong Yue,Hegui Zhang,Changjun Liu,Siyang Tang,Bin Liang
TiO2 pigments are widely used in paint industries. Inert coating layers were usually deposited on the TiO2 pigments to suppress the photocatalytic activity of TiO2, which can prevent the degradation of surrounding polymer molecules. However, the traditional wet chemical methods normally form thick films, which would impair the pigment properties of TiO2. In this work, SnO2 and SiO2 protective layers were grown on the TiO2 particle surface by low-temperature pulsed chemical vapor deposition. At temperatures <60 °C, thin and uniform amorphous SnO2 films were obtained. The photocatalytic activities of both TiO2/SnO2 and TiO2/SiO2 core–shell particles were suppressed, and TiO2/SnO2 core–shell particles showed higher lightening power than TiO2/SiO2. According to transient fluorescence, photocurrent, and electrochemical impedance spectroscopy measurements, the low electron mobility of amorphous SnO2 and SiO2 films led to fast recombination of photogenerated electrons and holes, thus preventing their migration to the surface and suppressing the photocatalytic activity of TiO2.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
ACS Catalysis
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2017
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IF 10.614
Miaomiao Liu,Weiqiang Tang,Zhaohui Xie,Hongbo Yu,Hongfeng Yin,Yisheng Xu,Shuangliang Zhao,Shenghu Zhou
In this work, Pt-SnO2 heteroaggregate nanocatalysts were synthesized by in situ transformation of Pt@Sn core–shell nanoparticles and their catalytic performance for hydrogenation of various substituted nitroaromatics was investigated. The Pt@Sn nanoparticles were prepared by a one-step method, and the alumina-supported Pt@Sn nanoparticles were further transformed in situ into Pt-SnO2 heteroaggregate nanostructures by calcination. The structures of Pt@Sn and Pt-SnO2 nanomaterials were characterized, and FT-IR with CO probes, HRTEM, XRD, and XPS characterizations revealed that the as-synthesized Pt@Sn nanoparticles were core@shell-like structures with Sn-rich shells and Pt-rich cores and the obtained Pt-SnO2 heteroaggregate nanostructures consisted of close-contact pure Pt and SnO2 phases. The Pt-SnO2/Al2O3 nanostructures demonstrated a better catalytic performance for hydrogenation of various substituted nitroaromatics relative to individual Pt/Al2O3 nanocatalysts. Theoretical calculations suggested that Pt-SnO2 nanocatalysts can slightly facilitate the adsorption of H2 and o-chloronitrobenzene and strongly weaken the binding of Pt/o-chloroaniline, resulting in more available reactants and easier release of products from the catalyst surfaces. The theoretical calculations indicated that the enhanced catalytic performance may originate from a cooperative interaction between Pt and SnO2.
研究领域:
化学
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催化科学
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材料科学
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2024
·
IF 3.8
Jianhong Han,Xinyuan Teng,Wenhui Jia,Pai Liu,Yumei Li,Weida Wang
Benzotriazole (BTA) is a kind of nitrogen-containing organic matter with great impact on the environment and biology. In order to further improve the degradation effect of BTA, SnO 2 /Fe 2 O 3 /Cu 2 O (SFC) photocatalytic materials have been successfully prepared by one-pot hydrothermal method . According to the material characterization and experimental results, SFC has a uniform distribution of active sites, which is conducive to the efficient degradation of BTA in water. When the pH is 6.68, the dosage is 0.09 g/L, and the time is 40 min, the degradation effect is the best. The removal rate of BTA by SFC reached 99.89 %. The repeatability test showed that the removal rate of SFC can reach more than 99.27 % after five cycles of experiments.Through PL , UV–Vis and i-t curve analysis, it proved the main mechanism of degradation of BTA by PEC enhanced by SFC. Finally, the possible degradation pathways of BTA were speculated, which provided a new technical support and theoretical basis for the effective treatment of wastewater containing BTA.
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
高影响因子
ACS Applied Materials & Interfaces
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2012
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IF 4.525
Junfei Liang,Yue Zhao,Lin Guo,Lidong Li
A flexible free-standing graphene/SnO2 nanocomposites paper (GSP) was prepared by coupling a simple filtration method and a thermal reduction together for the first time. Compared with the pure SnO2 nanoparticles, the GSP exhibited a better cycling stability, because the graphene with high mechanical strength and elasticity can work as a buffer to prevent the volume expansion and contraction of SnO2 nanoparticles during the Li+ insertion/extraction process. Meanwhile, compared with single graphene paper, the GSP showed a higher capacity because of the hybridizing with higher capacity SnO2 nanoparticles. The excellent electrochemical performance of the GSP as an anode material in Li-ion battery was obtained. The as-prepared GSP shows a great potential for flexible Li-ion batteries.
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2024
·
IF 5.3
Lu Tang,Huajing Wang,Zhenming Du,Chaoqi Zhu,Chaofan Ma,Dawen Zeng
Due to the large band gap, most metal oxide semiconductor (MOS)-based gas sensors operate at high temperatures, which greatly limits their performance for gas sensing. In this work, we reported the successful synthesis of nanocomposites consisting of porous MXene nanosheets formed by the sublimation of sulfur and SnO2 nanoparticles (S-PM/SnO2). To prevent the restacking of MXene flakes under van der Waals force, a sacrificial S-template method was employed to transform MXene into a three-dimensional (3D) structure. The presence of MXene lowers the operating temperature. With a high response (∼30.6 – 10 ppm of H2S), rapid response speed (∼16.6 s – 50 ppm of H2S), high sensitivity (∼3.12 ppm–1), low detection limits (distinct response to 100 ppb H2S), and good selectivity at 100 °C, the sensor based on the optimal sample of S-PM/SnO2-6 demonstrates excellent H2S sensing performance. The improvement in H2S gas-sensing capacity can be attributed to the development of heterojunctions at the interface of porous MXene nanosheets (S-PM) and SnO2 nanoparticles (NPs). This leads to an enlarged surface depletion region and an elevated potential barrier, which significantly amplifies the range of resistance variation. These results suggest that S-PM/SnO2 nanocomposite has promising prospects in the realm of low-temperature and highly sensitive H2S detection.
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
ACS Applied Nano Materials
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2022
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IF 6.14
Weimeng Zheng,Zhongyue Zhang,Nannan Liu,Qingyu Li,Jianbo Sun
The construction of heterogeneous structures could boost the performance of materials in gas sensing applications since the interface may enhance charge transfer. However, appropriate design and containable synthesis methods of heterogeneous structures with high-quality interfaces remain challenging. In this paper, heterolayered SnO2/SnSe nanosheet composites were prepared by regulating the alkali concentration to control the self-assembly rates of SnSe nanosheets while forming defect point oxidation. Heterolayered SnO2/SnSe nanosheets were synthesized by a one-step hydrothermal method and then used as a highly sensitive sensor for the detection of NO2 at room temperature. The as-obtained SnO2/SnSe materials were characterized using scanning electron microscopy, X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and I–V polarization to analyze the relationships between the heterogeneous structural morphology, crystallography, chemical components, electrical properties, and sensitivity mechanism. The results showed that the SnO2/SnSe-0.4 sample was prepared by the one-step hydrothermal method at the NaOH concentration of 0.04 mol/L. The SnO2/SnSe-0.4 sensor showed great sensitivity and higher selectivity to 1 ppm NO2 (resistance ratio = 7.8) at room temperature, roughly 7.1 and 2.7 times higher than that of pure SnSe and SnO2, respectively. In addition, the sensor exhibited a lower detection limit of 0.1 ppm. The improved sensing performance could be attributed to the large number of P–N heterojunctions of the SnO2/SnSe-0.4 material, enhanced interface charge transfer, and increased defect point oxidation in the material surface. The experimental results showed that SnO2/SnSe-0.4 is a very promising room-temperature NO2 gas sensing material, providing guidance for the rational design of heterogeneous structural sensors.
研究领域:
材料科学
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传感器技术
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纳米材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yaqian Pang,Junpeng Zhou,Xiaoli Yang,Yeqing Lan,Cheng Chen
In this study, the Co 3 O 4 -SnO 2 composite derived from bimetallic oxalates was rationally fabricated and utilized as a catalyst for peroxymonosulfate (PMS) activation towards the destruction of chloramphenicol (CAP). The physicochemical properties of the Co 3 O 4 -SnO 2 were systematically characterized to discover the relationship between its structure and catalytic performance. SnO 2 as a cocatalyst with high conductivity and stability immensely improved the activity of Co 3 O 4 in the Co 3 O 4 -SnO 2 composite. Approximately 98% of CAP (10 mg/L) was eliminated by the Co 3 O 4 -SnO 2 (0.1 g/L) activated PMS (1.0 mmol/L) at initial pH 7 within 20 min. The rationally designed Co 3 O 4 -SnO 2 composite exhibited higher catalytic activity than Co 3 O 4 , SnO 2 , and other cobalt-based bimetallic oxides (such as Co-Fe, Co-Mn, and Co-Cu) in the PMS activation for the CAP degradation. The synergistic effect of Co 3 O 4 and SnO 2 endowed the Co 3 O 4 -SnO 2 composite with higher conductivity and more electron transfer, which was proved by the electrochemical tests. The presence of SO 4 •− , • OH, O 2 •− , and 1 O 2 during the CAP degradation was testified by both quenching experiments and electron paramagnetic resonance (EPR) spectroscopy. In addition, the catalytic mechanism and degradation pathways were further proposed via the characterization of X-ray photoelectron spectroscopy (XPS) and the identification of transformation products, respectively. This work provides a new insight into the preparation of novel catalysts and their application in wastewater treatment.
研究领域:
环境科学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2025
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IF 6.3
Yan Chen,Qingsong Luo,Yu Wan,Shuang Gao,Yanting Wang,Changhao Feng
Background The rapid identification of n-butanol holds substantial significance; however, the current response speed of n-butanol gas sensors is relatively slow. The ZnO/SnO 2 composite nanofibers present a considerable prospect as a suitable alternative for conventional n-butanol sensors. Methods Pure SnO 2 and composite nanofibers composed of ZnO/SnO 2 with distinct molar ratios were crafted via the electrospinning technique. The microstructure and components of these composite nanofibers were analyzed and identified using XRD and SEM. Significant findings The ZnO/SnO 2 composite nanofibers-based gas sensor (ZS2) exhibited enhanced response towards n-butanol, achieving a high response of 29.68 to 30 ppm n-butanol at 150 °C, which was 3.3 times greater than that of SnO 2 . Moreover, the sensor also showcased a swift response time, taking just 1 s to react. Furthermore, the ZS2 sensor had a lower potential limit for detecting n-butanol, with a value of 0.27 ppm. The good repeatability and stability were also confirmed in this study. The successful creation of heterojunctions is thought to be contributing factors to ZS2 nanofibers’ superior sensing capabilities. Therefore, ZnO/SnO 2 composite nanofibers can be considered as a promising candidate for sensing materials in practical applications.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2024
·Vol. 24
·期 19
·6420
·
IF 3.4
Cheng Zou,Cheng Peng,Xiaopeng She,Mengqing Wang,Bo Peng,Yong Zhou
Pure tin oxide (SnO2) as a typical conductometric hydrogen sulfide (H2S) gas-sensing material always suffers from limited sensitivity, elevated operation temperature, and poor selectivity. To overcome these hindrances, in this work, hollow CuO-SnO2nanotubes were successfully electrospun for room-temperature (25 °C) trace H2S detection under blue light activation. Among all SnO2-based candidates, a pure SnO2sensor showed no signal, even toward 10 ppm, while the 1% CuO-SnO2sensor achieved a limit of detection (LoD) value of 2.5 ppm, a large response of 4.7, and a short response/recovery time of 21/61 s toward 10 ppm H2S, as well as nice repeatability, long-term stability, and selectivity. This excellent performance could be ascribed to the one-dimensional (1D) hollow nanostructure, abundant p-n heterojunctions, and the photoelectric effect of the CuO-SnO2nanotubes. The proposed design strategies cater to the demanding requirements of high sensitivity and low power consumption in future application scenarios such as Internet of Things and smart optoelectronic systems.
研究领域:
材料科学
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传感器技术
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纳米科技
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）