INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yujuan Hu,Kelin Hu,Jing Zhang,Yuxiao Jiang,Tao He,Yu He,Rujing Yan
This paper presents a hydrogen sensor made of WSe 2 modified monocrystalline SnSe 2 nanolayer . The hydrogen sensitive property of tungsten diselenide (WSe 2 ) and tin diselenide (SnSe 2 ) was found by hydrothermal adjustment of the molar ratio . The samples were characterized for their crystal structure, microstructure, morphology, and elemental composition , and the morphology and heterojunction formation of the nanocomposites were confirmed. When the optimal molar ratio is 1:1 and the optimal working temperature is 270 °C, the WSe 2 /SnSe 2 sensor have good sensing properties for hydrogen, and the sensitivity for 100 ppm hydrogen is about 7.27. Finally, the experiment proves that WSe 2 /SnSe 2 gas sensor has a unique selection of hydrogen and has a wide application prospect in hydrogen detection in the future. The gas sensing mechanism of the hydrogen sensor is discussed based on its material structure .
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
CHEMISTRY-A EUROPEAN JOURNAL
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2020
·Vol. 26
·期 17
·3870-3876
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IF 4.857
Xiaoshan Wang,Yao Liu,Jie Dai,Qian Chen,Xiao Huang,Wei Huang
Graphical By taking advantage of the crystal phase dependent electronic property of SnSe x based materials, SnSe( x %)/SnSe 2 (100− x %) p–n heterostructures were synthesized via a facile one-step colloidal method, and the SnSe(50 %)/SnSe 2 (50 %) based sensor exhibited much improved sensing performance due to the formation of p–n hetero-junctions. The formation of semiconductor heterostructures is an effective approach to achieve high performance in electrical gas sensing. However, such heterostructures are usually prepared via multi-step procedures. In this contribution, by taking advantage of the crystal phase-dependent electronic property of SnSe x based materials, we report a one-step colloid method for the preparation of SnSe( x %)/SnSe 2 (100− x %) p–n heterostructures, with x ≈30, 50, and 70. The obtained materials with solution processability were successfully fabricated into NO 2 sensors. Among them, the SnSe(50 %)/SnSe 2 (50 %) based sensor with an active layer thickness of 2 μm exhibited the highest sensitivity to NO 2 (30 % at 0.1 ppm) with a limit of detection (LOD) down to 69 ppb at room temperature (25 °C). This was mainly attributed to the formation of p–n junctions that allowed for gas-induced modification of the junction barriers. Under 405 nm laser illumination, the sensor performance was further enhanced, exhibiting a 3.5 times increased response toward 0.1 ppm NO 2 , along with a recovery time of 4.6 min.
研究领域:
材料科学
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化学传感器
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纳米技术
✓ 已验证
DOI
高影响因子
TALANTA
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2024
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IF 5.6
Huimin Yang,Yazhou Yang,Chaofan Ma,Qirui Wu,Jiahong Tang,Chaoqi Zhu,Xiaoxia Wang,Dawen Zeng
NO 2 is a hazardous gas extremely harmful to the ecosystem and human health, so effective detection of NO 2 is critical. SnSe 2 is a promising candidate for gas sensors owing to its unique layered configuration that facilitates the diffusion of gas molecules. Here, ultrathin self–assembled nanoflowers F–SnSe 2 rich in defects were synthesized by a simple solvothermal method. It exhibits excellent gas sensing performances for NO 2 at room temperature (25 °C), with a high gas sensing response of 8.6 for 1 ppm NO 2 and a lower detection limit as low as 200 ppb, capable of sensitively detecting ppb–level NO 2 . DFT calculations revealed that the presence of Se vacancies assists the central Sn atoms to break through the shielding effect of the surface Se atoms and become exposed active sites. The higher reactivity leads to more charge transfer and higher adsorption energy , which strongly promoted the adsorption of NO 2 . This work verifies the important role of vacancies for the exposed active sites and provides new guidance for defect engineering to modulate the gas sensing performances of SnSe 2 .
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wei Liu,Ding Gu,Xiaogan Li
A novel chemiresistive-type sensor for detecting sub-ppm NO2 has been fabricated using AuPt bimetal-decorated SnSe2 microflowers, which was synthesized by the hydrothermal treatment followed by in situ chemical reduction of the bimetal precursors on the surface of the petals of the microflowers. The as-prepared sensor registers a superior performance in detection of sub-ppm concentration of NO2. Functionalized by the AuPt bimetal, the SnSe2 microflower-based sensor shows a response of approximately 4.62 to 8 ppm NO2 at 130 °C. It is significantly higher than those of the sensors using the pristine SnSe2 (∼2.29) and the modified SnSe2 samples by a single metal, either Au (∼3.03) or Pt (∼3.97). The sensor demonstrates excellent long-term stability, signal repeatability, and selectivity to some typical interfering gaseous species including ammonia, acetone, formaldehyde, ethanol, methanol, benzene, CO2, SO2, and CO. The remarkable improvement of the sensitive characteristics could be induced by the electronic and chemical sensitization and the synergistic effect of the AuPt bimetal. Density functional theory (DFT) is implemented to calculate the adsorption states of NO2 on the sensing materials and thus to possibly reveal the sensing mechanism. The significantly enhanced response of the SnSe2-based sensor decorated with AuPt bimetallic nanoparticles has been found to be possibly caused by the orbital hybridization of O, Au, and Pt atoms leading to the redistribution of electrons, which is beneficial for NO2 molecules to obtain more electrons from the composite material.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
ENERGY & FUELS
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2024
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IF 5.2
Rihong Xiao,Yili Zhang,Kaiyan Long,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Mercury, a toxic heavy metal, poses significant risks to human health. Coal-fired power plants are the largest anthropogenic sources of mercury emissions, making mercury removal from flue gas imperative. Among various mercury adsorbents, metal selenides show promising potential in mercury capture. Here, we reported the synthesis of a novel three-dimensional hierarchical flower-like material, SnSe2, and its debut application in flue gas mercury capture. Under the influence of low-coordinated selenium, the introduction of abundant selenium vacancy defects led to the exposure of additional active sites in the adsorbent. Additionally, the presence of Sn enhanced gas selectivity and promoted electron transfer processes, thereby augmenting Hg0 adsorption and oxidation performance. Benefiting from these advantages, SnSe2 exhibited superior mercury removal performance over a wide temperature range (30–180 °C), with a saturated mercury adsorption capacity of 2027.23 μg/g, surpassing that of commercial activated carbon. Furthermore, the presence of NO in flue gas improved mercury adsorption performance, while high concentrations of SO2 do not affect mercury removal efficiency, as elucidated by adsorption kinetics models. Moreover, the mercury adsorption mechanism was demonstrated through mercury temperature-programmed desorption (Hg-TPD) and density functional theory (DFT) calculations. Finally, toxicity characteristic leaching procedure (TCLP) experiments confirmed SnSe2 as an efficient and permanent adsorbent for mercury, offering insights into the application of novel mercury removal materials.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2018
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IF 3.057
Shaohai Wu,Chengyan Liu,Zhengsen Wu,Lei Miao,Jie Gao,Xiaokai Hu,Junliang Chen,Yanyan Zheng,Xiuxia Wang,Chengjin Shen,Hengquan Yang,Xiaoyuan Zhou
SnSe 2 is regarded as an attractive thermoelectric material for its structural and chemical analogy to SnSe that is claimed with the highest ZT in single crystal. In this study, the pure and Cl-doped SnSe 2 polycrystals (3%, 6%, 9% and 12% molar Cl content) were fabricated in four steps that are hydrothermal synthesis , heating purification, diffusion doping, and spark plasma sintering . The phase structure, lamellar morphology and crystallite orientation were studied for the synthesized SnSe 2 powder and the sintered pellets. The structural evolution was traced from the SnSe 2 hexagonal plates of powders to the (001) oriented grains in pellets. The Cl doping into SnSe 2 was verified by phase composition, lattice parameter , element distribution, and chemical valance. The doped Cl increased both the carrier concentration and the mobility. The anisotropic thermoelectric properties of SnSe 2 bulk materials were investigated as functions of temperature from 50 °C to 300 °C and the doping amount, respectively. The Seebeck coefficient was less anisotropic than the electrical and thermal conduction . The grain orientation influenced the anisotropy of the electrical and thermal conductivity at a similar ratio. The power factors were less dependent on temperature with an optimum in-plane 1.06 mW m −1 K −2 and out-of-plane 0.41 mW m −1 K −2 . The highest ZT s of 0.3 were attained at 300 °C in both directions.
研究领域:
材料科学
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热电材料
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2019
·Vol. 7
·期 16
·9761-9772
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IF 10.733
Chengyan Liu,Zhiwei Huang,Dianhui Wang,Xiuxia Wang,Lei Miao,Xiaoyang Wang,Shaohai Wu,Nozomu Toyama,Toru Asaka,Junliang Chen,Eiji Nishibori,Li-Dong Zhao
Recently, thermoelectric lead-free selenides have attracted great attention due to their earth-abundant, low-cost and environment-friendly characteristics. Here we report a new strategy to simultaneously enhance the electronic transport properties and reduce the thermal conductivity of polycrystalline SnSe2. By combining weak van der Waals bonding with the mobile behavior of Ag+ ions, the carrier concentration is optimized over a wide temperature range, which can be attributed to the dynamic Ag+-intercalation into the van der Waals gap from the Ag+ ion reservoir AgSnSe2. On account of additional electrical bridges between interlayers contributed by the intercalated Ag+ ions and weak anisotropy, an exciting high power factor of up to ∼7.46 μW cm−1 K−2 at 789 K is achieved along the pressing direction. In addition, the thermal conductivity is simultaneously reduced to ∼0.57 W m−1 K−1 at 789 K, owing to numerous line defects, phase interfaces, twin boundaries, dislocations and intercalated atomic layers generated after Ag introduction, as well as the anharmonic vibration of Ag+ ions. As a result, a record peak ZT of ∼1.03 at 789 K is realized along the pressing direction, which is ∼1.6 times larger than the highest reported value (0.63) of polycrystalline SnSe2 and even comparable to that of p-type polycrystalline SnSe. This study opens a new way to achieve ultra-high thermoelectric performance, especially in layered materials.
研究领域:
材料科学
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能源材料
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凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Chengjiu Zhao,Xuezheng Guo,Yanqiao Ding,Chengyao Liang,Bingsheng Du,Wen Niu,Weijie Qu,Yijie Shi,Shuren Cong,Gang Meng,Yong He
Complex gas environments and the demand for room temperature detection will provide challenges for chemo-resistive-type gas sensors in a variety of applications. In this work, 2D/0D SnSe 2 /TiO 2 composite is used as a sensing material, displaying good sensitivity and specificity to ppb-level NO 2 at ambient temperature (25 °C). The response value and time of the SnSe 2 /TiO 2 sensor are 207 % and 139s when exposed to 100 ppb NO 2 , as opposed to 62 % and 183s for the pristine SnSe 2 sensor. The composite sensor also offers great long-term stability for NO 2 and good gas selectivity. Notably, the SnSe 2 /TiO 2 sensor's mixed gases (NO 2 +H 2 S) measurement is done to examine its NO 2 detection capacity in the presence of interfering gas. The constructed composite sensor can accurately detect NO 2 even if the concentration of the reductive interfering H 2 S is 66.7 times higher than that of the oxidative target NO 2 . The effective usage of SnSe 2 modified by TiO 2 for low-concentration, room-temperature NO 2 detection in a complex gas environment is shown by the composite sensor's pleasing gas detection results.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
·
IF 9.9
Jian Li,Wenbin Luo,Zhen Zhang,Fenghong Li,Zisheng Chao,JinCheng Fan
Advances in cathode material design and understanding of intercalation mechanisms are necessary to improve the overall performance of aluminum ion batteries . Therefore, we designed ZnSe/SnSe 2 hollow microcubes with heterojunction structure as a cathode material for aluminum ion batteries. ZnSe/SnSe 2 hollow microcubes with an average size of about 1.4 µm were prepared by selenization of ZnSn(OH) 6 microcubes successfully. The shell thickness of ZnSe/SnSe 2 hollow microcubes is about 250 nm. On one hand, the hollow cubic structure can effectively alleviate the volume effect, provide shorter ion diffusion paths, and increase the contact area with the electrolyte. On the other hand, ZnSe/SnSe 2 heterojunction structure can establish a built-in electric field to facilitate ion transport. The synergistic effect of the two leads to the improved electrochemical performance of ZnSe/SnSe 2 as the cathode of aluminum ion batteries. The material delivered a reversible capacity of 124 mAh/g after 150 cycles at a current density of 100 mA/g. Meanwhile, coulombic efficiency remained above 98% in almost all cycles. In addition, the electrochemical reaction mechanism and kinetic process of Al 3+ and ZnSe/SnSe 2 were studied.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Tiewei Zhao,Guoqing Feng,Lingling Zhou,Xin Wang,Xiaoqin Li,Feng Jiang,Huiyu Li,Yongsheng Liu,Qing Yu,Haijing Cao,Yan Xu,Yanyan Zhu
High-capacity SnSe2 cathode materials combine the advantages of conversion and alloying reactions, showing great prospects in supercapacitors. However, they have poor cycling performance and low electronic conductivity. To effectively improve their electrochemical performance, a bimetallic selenide heterostructure was constructed and a three-dimensional graphene (3DG) carbon layer was encapsulated. 3DG increases the specific surface areas of the material, stabilizes the internal structures, and promotes the reaction kinetics. The obvious lattice distortions and mismatches at the ZnSe–SnSe2 heterointerfaces generate a large number of crystal defects and active sites for the adsorption/desorption of OH– ions, which is beneficial for the insertion and extraction of ions during the cycling processes and further enhances the electronic conductivity of the electrode material. Benefiting from these two strategies, 3DG/ZnSe–SnSe2 exhibits a high specific capacity of 1515.2 F g–1 at 1 A g–1 and maintains a capacity retention rate of 90.1% after 3000 cycles at 5 A g–1. Furthermore, the asymmetric supercapacitor 3DG/ZnSe–SnSe2//AC assembled with activated carbon (AC) exhibits excellent electrochemical performance, demonstrating an energy density of 25.3 Wh kg–1 at 750 W kg–1 and a remarkable capacity retention rate of 91.3% after 20,000 cycles at 5 A g–1.
研究领域:
材料科学
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能源存储与转换
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Shuyan Shao,Tao Wen,Ziqun Wang,Xiaoshuang Yin,Ying Liu,Wenzhong Yang,Yun Chen
Electrocatalytic reduction of CO 2 to formate is an extremely attractive route. Here, we developed a SnSe 2 -graphene composite catalyst, and SnSe 2 nanosheets were linked to graphene by Sn-O-C bonds to form complicated hierarchical nanosheet structure. Due to the intrinsic activity of SnSe 2 and the modification of graphene, the catalyst performed excellent electrocatalytic efficacy for the reduction of CO 2 to formate, with a maximum Faraday efficiency up to 95.1% at -0.9 V (vs. RHE) and a current density of 11.8 mA cm −2 under the optimal conditions. Kinetic experiments indicated that the SnSe 2 -graphene composite achieved efficient formate selectivity for CO 2 reduction by increasing the initial transfer rate of electrons to the CO 2 molecule.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
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IF 8.9
Wan-Jing Yu,Bochuan Deng,Tianhui An,Jing Wang,Yong Ji,Haiyan Cai,Hua Zhang,Hui Tong
Tin-based materials have been widely concerned as a competitor among various anode materials for lithium-ion battery (LIBs), due to their high theoretical capacities and relatively low lithiation potential. However, intrinsic drawbacks of poor electrical conductivity and severe volume expansion have hindered practical application of tin-based anode materials. Herein, we design and construct a novel multiphase-structure of SnSe 2 -SnO 2 confined in graphene nanoribbons (SnSe 2 -SnO 2 @GNRs) as anode materials for LIBs. The composite can deliver a specific discharge capacity of 998.0 mA h g −1 at a rate of 0.1 A g −1 . When the current density is increased to 5.0 A g −1 , the specific capacity is still maintained to be 416.0 mA h g −1 . The excellent electrochemical performance can be ascribed to the flexible and interlaced GNRs network in nanocomposite, which can not only improve the electrical conductivity of SnSe 2 -SnO 2 and alleviate its drastic volume change upon lithiation and delithiation, but also bring in abundant surface defects, which is conducive to electrochemical pseudo-capacitance energy storage. Meanwhile, the SnSe 2 -SnO 2 heterostructures can further enhance the electrochemical reaction kinetics of the anode materials and promote the anchoring of Li atoms at the interface. This opens a new pathway to synthesize Tin-based nano-structure as superior anode materials for high-performance LIBs.
研究领域:
材料科学
·
能源存储
✓ 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）