RSC Advances
·
2022
·Vol. 12
·期 36
·23503-23512
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IF 4.036
Kun Huang,Lan Yang,Yihong Gao,Shikuo Li,Hui Zhang,Fangzhi Huang
For electrocatalytic hydrogen evolution in acidic environments, the stability of catalysts has always been a significant factor restricting development. Here, we prepared a superstable SnO2/MoS2 coupled nanosheet array on carbon cloth (CC@SnO2/MoS2), exhibiting an overpotential of 166 mV at a current density of 10 mA cm−2. According to the results of various tests and theoretical calculations, it is shown that the establishment of SnO2/MoS2 interface engineering is to accelerate the electron transmission on the heterogeneous interface and S defects on the edge of MoS2, and finally improve the conductivity and catalytic activity of the catalyst. More importantly, the formation of an SnO2 interface layer during in situ transformation improves the stability and hydrophilicity of the material surface. We have proposed a strategy for engineering an interface with fast electron transport and proton adsorption, providing some new ideas for the design of HER catalysts in acid electrolytes.
研究领域:
材料科学
·
电化学
·
理论计算
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mengyun Wang,Chuanxuan Zhou,Fuchao Yang
The size effect through quantum dots is an effective method to improve the performance of gas sensors. This paper reports the design of a triethylamine sensor based on a SnO 2 -MoS 2 heterojunction structure. The porous SnO 2 was synthesized using a polystyrene microsphere template and then loaded with MoS 2 quantum dots (MoS 2 QDs) by the impregnation method. The gas-sensitizing properties of the prepared sensors were systematically investigated. Compared with the single SnO 2 and MoS 2 gas sensing materials, the SnO 2 -MoS 2 sensor showed higher selectivity to triethylamine at the optimal operating temperature of 160 °C, and the response performance was improved by 192 %. The results show that the SnO 2 -MoS 2 heterojunction improves the sensing performance due to its unique pore structure, oxygen vacancies and n-n heterojunction. In addition, the energy band structure and triethylamine sensing mechanism of SnO 2 -MoS 2 heterojunctions were analyzed by density functional theory. This work provides significant value for the study of gas-sensitive properties and triethylamine sensors of SnO 2 -MoS 2 QDs composites.
研究领域:
材料科学
·
传感器技术
·
理论计算
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhicai Yu,Lele Huang,Mi Zhou,Jie Xu,Jianchao Ma,Yuhang Wan,Qing Jiang,Xueru Qu,Hualing He
Early fire warning represents an effective mean in the face of fire that can remind people in timely manner to adopt effective countermeasures before the occurrence of fire. Despite the encouraging progress of current early fire-warning sensors, a more sensitive monitoring of early fires in multiple aspects remains challenge. Herein, a dual-mode core-sheath structured SnO 2 /MoS 2 @MXene@ANFs (SMA) early fire warning sensor fiber was prepared by coaxial wet spinning technology. The core-layer of SMA fiber comprised the thermoelectric material Ti 3 C 2 T X MXene, whereas the shell-layer comprised the gas-sensitive SnO 2 /MoS 2 and silver nanowires (Ag NWs) along with aramid nanofibers (ANFs). The robust and flame-retardant ANFs served as protective shell, safeguarding the stability and flexibility of the temperature and gas sensing functions within the fiber. Based on the thermoelectric performance of MXene, there is a linear relationship between the output voltage and temperature difference of SMA fiber, which can achieve wide range of temperature sensing from 50 to 300 ℃ and accurately identify abnormal temperature increases in the environment. Simultaneously, The bridging effect between one-dimensional Ag NWs and SnO 2 /MoS 2 enhances the sensing capability of fiber for CO (R 0 /R = 1.43@100 ppm). In addition, an early fire warning system based on SMA fiber has been established, which can sensitively detect the flames (≤4 s). This system can also be used for monitoring CO gas in fire environments, guiding firefighters’ rescue actions, expanding the application scope of early fire warning sensors in the past, and opening up new directions for the development of intelligent early fire sensors in the future.
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
International Journal of Electrochemical Science
·
2025
·
IF 2.4
Yiqiu Wang,Zhuotong Yu,Yourong Wang,Junjie You,Chuanqing Du,Siqing Cheng
Tin oxide (SnO 2 ) as one of the most intensively investigated anode materials for LIBs is impeded for its commercial application due to the low electronic conductivity and huge volume change during the charge/discharge process which resulting in severe capacity fading and poor cycling ability. Herein, hybrid SnO 2 /MoS 2 @C nanocomposite was designed and synthesized hydrothermally using P123 as dispersant and glucose as the carbon source, and investigated electrochemically and comparatively. The results show that the hybrid SnO 2 /MoS 2 @C nanocomposite anode delivers reversible specific capacities of 1047.41, 985.06, 837.23, 687.37 and 545.96 mAh g −1 at current densities of 0.1, 0.2, 0.5, 1, and 2 A g −1 , respectively and the discharge specific capacity still remains ca. 1047 mAh g −1 after 200 cycles at 0.1 A g −1 , demonstrating an improved cycling stability and rate capability, which might be attributed to the unique hybrid architecture with synergistic effect on the reaction kinetics and charge transfer properties. This paves a way for developing advanced energy storage materials in in next-generation energy storage systems.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Jiajia Zheng,Mengmeng Gao,Sitong Feng,Zuorong Huang,Jiusheng Cai,Jing He,Lei Wu,Xishuang Liang,Qi Guo,Yongsen Yu,Fengmin Liu,Geyu Lu
An NO 2 fiber-optic sensor with integrated humidity compensation functionality was proposed. • Excellent NO 2 detection performance with a detection limit as low as 10 ppb. • SnO 2 /MoS 2 composite significantly enhances sensitivity. This study proposes an evanescent wave fiber-optic sensor based on an SMF-CLF-TCF-CLF-SMF interferometric structure and a SnO 2 /MoS 2 composite sensitive film, which responds to NO 2 concentration and environmental humidity through changes in transmitted light intensity and interference wavelength shift, respectively, exhibiting dual-parameter differential spectral response characteristics. The structure utilizes a coreless fiber for mode conversion and employs a Thin-core Fiber as the region for evanescent field excitation and sensitive material coating. SnO 2 and MoS 2 nanomaterials were synthesized via hydrothermal methods, and SnO 2 /MoS 2 composites with varying MoS 2 loading ratios were prepared using ultrasonic mixing. Under conditions of 25 ℃ and 20% RH, the SnO 2 /1.0 wt% MoS 2 sensor demonstrated optimal overall NO 2 sensing performance: achieving a sensitivity of 2.26 dB/dec over the 10–5000 ppb range—approximately 9 times higher than that of pure SnO 2 sensors—with a minimum detectable concentration of 10 ppb, response and recovery times of approximately 16 s and 12 s, respectively, and excellent long-term stability. Humidity experiments were independently conducted at 25 ℃; as relative humidity increased from 20% to 80%, the interference spectrum continuously shifted toward shorter wavelengths, reaching a maximum wavelength shift of 16.45 nm. Experimental results indicate that changes in NO 2 concentration primarily manifest as variations in transmitted light intensity, whereas humidity changes mainly result in shifts in the interference wavelength. This research provides an experimental foundation for high-sensitivity, ppb-level NO 2 fiber-optic detection at room temperature and dual-parameter sensing of both NO 2 and humidity. Download: Download high-res image (179KB) Download: Download full-size image
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DOI
高影响因子
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