INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 6
·8577-8592
·
IF 5.164
Wei Han,Wei Wang,Yongqiang Zhang,Yijie Wang,Mei Li,Yang Sun
Summary To recover Pr from molten chlorides, the electrode reactions of Pr 3+ on Sn-coated W and liquid Sn electrodes were studied by a group of electrochemical techniques. CV and SWV results exhibited that the electrochemical signals pertaining to the formation of Pr-Sn alloy compounds and solid solution appeared at less negative potentials than that of Pr 3+ on W electrode. The thermodynamic data of Pr-Sn alloy compounds and the kinetic parameters for PrSn 3 /Pr 3+ pair were determined employing OCP, LP, and Tafel methods, separately. The measured diffusion coefficient ( D ) of Pr in liquid Sn metal was 9.40 × 10 −6 cm 2 s −1 . Furthermore, the electrochemical recovering Pr from molten salt was performed using liquid Sn as a working electrode, and the formed Pr-Sn samples characterized by XRD and SEM-EDS were composed of Sn and PrSn 3 phases.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Jiaxing Ouyang,Yingming Wang,Nian Wu,Gongwei Wang,Li Xiao,Juntao Lu,Lin Zhuang
Metallic tin (Sn) has always been considered as an anode candidate for nonaqueous lithium-ion batteries (LIBs). Nevertheless, there were hardly any attempts to use Sn as an anode material in aqueous batteries. Although Sn possesses relatively high specific capacity (451.54 mAh/g, two-electron transfer reaction), mild electrode potential (−0.1375 V vs the standard hydrogen electrode, Sn2+ + 2e– = Sn), high hydrogen overpotential, and environmental friendliness, it also suffers from bad reversibility and low Coulombic efficiency (CE) in common aqueous electrolytes. In this work, a dendrite-free Sn anode with highly improved reversibility in an aqueous electrolyte was realized using a type of “water-in-salt” electrolyte (1 m Sn(OTf)2 + 20 m LiTFSI). The results of Fourier transform infrared (FTIR) spectra and density functional theory (DFT) calculations have verified the significant impact of highly concentrated LiTFSI salt on Sn2+ hydrolysis, which is the key factor in improving the reversibility of the Sn anode and suppressing the dendrite formation. A Sn/LiFePO4 cell applying this electrolyte was acquired with a discharge plateau at around 0.6 V. In the cyclability test, the Sn anode exhibited a stable discharge capacity of more than 107 mAh/g with a Coulombic efficiency (CE) of 95% for 35 cycles (0.2C rate).
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Keqiang Xu,Xiaoping Shen,Zhenyu Yan,Zhenyuan Ji,Aihua Yuan,Guoxing Zhu,Lirong Kong,Jun Zhu,Baolong Li
Tin (Sn)-based anodic materials have attracted tremendous attention in lithium-ion batteries (LIBs) owing to their high theoretical capacity and low potential (0.5 V versus Li/Li + ). However, Sn-based anodic materials usually suffer from serious structural collapse and large volume expansion. To overcome this obstacle, herein, a dual-buffer structure of tin-cobalt (Sn-Co) alloy-based nanocomposite was designed through thermal annealing of a cyanometallic framework. The inactive Co acts as robust framework to buffer the volume expansion of Sn-Co alloy nanoparticles , and the reduced graphene oxide (rGO) matrix can reduce the aggregation of Sn-Co nanoparticles as well as alleviate the structure collapse of electrode during long-term cycling. As LIBs anodes, the Sn-Co/rGO composites exhibit a high reversible capacity (1055 mAh g −1 at 0.2 A g −1 after 250 cycles), good rate capability (320 mAh g −1 at 5 A g −1 ), and outstanding long-term cycling performance (720 mAh g −1 at 1 A g −1 after 600 cycles). When coupled with LiFePO 4 , the full battery can also display high electrochemical performance in terms of discharge capacity and cyclic stability.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zong Li,Yujie Feng,Yunfei Li,Xuepeng Chen,Nan Li,Weihua He,Jia Liu
CO 2 electrochemical reduction (CO 2 ER) can convert CO 2 into value-added liquid fuel, which can not only mitigate the global warming problem caused by CO 2 , but also can be used for energy storage in the form of intermittent renewable energy. High-performance catalysts are required in order to efficiently conduct electrochemical carbon dioxide reduction under mild conditions. In this work, the bimetallic bismuth and tin were deposited on the copper mesh via a simple and speedy electrodeposition strategy and assessed as electrocatalysts for the conversion of CO 2 to formate. The Bi 5 Sn 60 electrode (bismuth deposition time of 5 min, tin deposition time of 60 min) exhibited an excellent catalytic activity with a remarkably high Faradaic efficiency of 94.8% and partial current density of 34.0 mA cm −2 at − 1.0 V vs RHE. More intriguingly, it exhibited a remarkable formate production rate of 634.3 μmol cm −2 h −1 that outperformed most of the reported electrocatalysts. The pine needle-shaped dendritic structures could provide a considerable surface area and massive active sites. The fast electron transfer was of great benefit to the formation of CO 2 • − intermediate. The metal oxide/metal metastable interface was conducive to stabilizing the CO 2 • − intermediate and inhibiting the hydrogen evolution reaction (HER) process. Moreover, the optimized electronic structure strengthened the pathway related to the OCHO • intermediate, thereby boosted the conversion of CO 2 to formate. The results demonstrated that the dendrite structured Bi/Sn bimetallic catalysts would be a promising candidate for high-efficiency CO 2 reduction.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Haoren Wang,Huiwen Huang,Kashan Bashir,Chunyi Li
Tin oxide supported on silica (SnO 2 /SiO 2 ) were prepared by incipient-wetness impregnation method and examined for propane dehydrogenation at 600 °C. The physicochemical properties of SnO 2 /SiO 2 were characterized by N 2 -physisorption, XRD, UV–vis-DRS and H 2 -TPR. The results indicate that, at Sn loading ≤ 1.78 wt%, SiO 2 contains a uniform distribution of Sn as isolated species in tetrahedral coordination, while crystalline SnO 2 together with isolated Sn species are found for the higher Sn loadings. The reducibility of various Sn species was studied by a combination of XPS, H 2 -TPR, and reduction-reoxidation-TPR techniques. The results reveal that after high-temperature H 2 reduction, crystalline SnO 2 is fully reduced to metallic Sn, whereas isolated Sn are stabilized in the Sn 2+ state with high dispersion due to a strong interaction between isolated Sn and support. Catalytic activity tests showed that these Sn 2+ species exhibits both high activity and stability for propane dehydrogenation.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Zhiguo Zhu,Haikuo Ma,Mingtong Li,Ting Su,Hongying Lü
Sn-containing Beta (Sn-Beta) zeolite is extensively applied in industrially-relevant reactions as a highly active and robust Lewis acid heterogeneous catalyst. Nonetheless, environmentally-unfriendly fluoride is generally required to the directly hydrothermal synthesis of Sn-Beta. In this work, an innovative strategy of interzeolite transformation with steam-assisted conversion is provided to directly synthesize Sn-Beta zeolite in the absence of fluoride. Silica source of FAU and steam-assisted conversion were two necessary factors for the successful synthesis of Sn-Beta zeolite. It was found that highly crystallized Sn-Beta zeolite with isolated framework Sn ions was hydrothermally synthesized via degradation of siliceous FAU zeolite and recrystallization of degraded silicate species. As far as we know, the crystal of Sn-Beta in this work was minimum in size among all present directly hydrothermal synthesized ones. More importantly, the Sn contents in Sn-Beta could achieve to 2.39 wt % (Si/Sn = 81), breaking through the Sn content restriction of conventional fluoride-mediated method. In addition, the hydrophobicity of this resultant Sn-Beta zeolite was slightly inferior to Sn-Beta-F obtained via traditional fluoride-assisted route. Whereas the smaller crystal size of this Sn-Beta gave rise to relatively good diffusion performance for organics, which made it reveal high activities in the Baeyer-Villiger oxidant of ketones in particular employing bulky tert -butyl hydroperoxide as the oxidant. The current strategy provides an alternative and environmentally-friendly method for the hydrothermal synthesis of Sn-Beta without the assistance of fluoride and alkali metal ions, which can guide further development in metallosilicates crystal engineering in terms of greenization.
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-14
·
IF 9.043
Luo Linqu,Song Jianjun,Song Longfei,Zhang Hongchao,Bi Yicheng,Liu Lei,Yin Longwei,Wang Fengyun,Wang Guoxiu
3D hierarchical conductive Sn quantum dots encapsulated in N,S co-doped carbon nanofibers sheathed within rGO scrolls (Sn/NS-CNFs@rGO) were prepared through an electrospinning process.
Flexible Sn/NS-CNFs@rGO electrode exhibits superior long-term cycling stability and high-rate capability in sodium-ion batteries.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Zhaomin Wang,Lu Yu,Limin Chang,Limin Wang,Yong Cheng
Owing to its high capacity of 994 mAh g −1 , low cost, and environmental friendliness , tin (Sn) is considered as an advanced anode material for high-capacity lithium-ion batteries (LIBs). Here, a facile strategy to fabricate core-shell structured Sn@NC composites with one-step and large-scale production is introduced in a liquid-phase reaction under room temperature . When used as anode materials for LIBs, the optimal Sn@NC composite delivers a high reversible discharge capacity of 761.2 and 476 mAh g −1 at a current density of 200 and 1000 mA g −1 after 200 cycles, respectively. A high capacity of 328.3 mAh g −1 can also be obtained even at a current density of 2000 mA g −1 . The excellent cycling stability and rate performance of the composite can be ascribed to the synergistic effect of the nanometer size of Sn powder and porous structure of the carbon shell, both of which can effectively reduce the absolute volume change of electrode during the repeated charge-discharge cycles, and thus lead to excellent electrochemical performances at both rate capability and cycling life.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jin-Feng Liao,Yang-Fan Xu,Xu-Dong Wang,Hong-Yan Chen,Dai-Bin Kuang
Though coating CsPbBr3 nanocrystal (NC) with an outer layer has been regarded as an effective strategy to address its instability issues, deep investigations into the electronic interaction between CsPbBr3 NC and coating layer have yet to be conducted. In this study, the dynamics of hot carrier and charge carrier of CsPbBr3 nanocrystal with various MO2 (M = Si, Ti, Sn) coating layers have been comprehensively studied. Combined transient optical characterizations (time-resolved photoluminescence and ultrafast transient absorption) and photoelectrochemical measurements reveal that coating with insulating SiO2 accelerates the hot carrier relaxation and enhances the radiative recombination by passivating surface traps, whereas efficient charge-carrier separation and extraction are observed after coating with SnO2 and TiO2. The electron injection from CsPbBr3 NC to SnO2 (1.14 × 108 s–1) is 2-fold faster than to TiO2 (5.4 × 107 s–1) owing to the lower conduction band edge and the higher electron mobility of SnO2. Particularly, the first time fabricated CsPbBr3 NC/SnO2 composite exhibits superior stability against UV light and moisture, as well as the best photocurrent response in this study. This work has implied that rational design of the coating layer for perovskite NC can not only improve the stability but also tailor the electronic and optoelectronic properties for various applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2018
·
IF 4.908
Wenzhi Li,Mingxue Su,Tingwei Zhang,Qiaozhi Ma,Wei Fan
Liquid fuel intermediates can be produced via aldol condensation reactions between furfural and acetone. It was found that potassium-promoted Lewis acid zeolite Sn-MFI performed superior catalytic performance for C C bond coupling by aldol condensation reactions of furfural with acetone. The presence of K in Sn-MFI catalyst improves the catalytic activity of the catalyst likely due to increased basicity. The product distribution of aldol condensation was also changed remarkably with the addition of K. Besides 4-(2-furyl)-3-buten-2-one (FAc), 1, 5-di-2-furanyl-1, 4-pentadien-3-one (F 2 Ac) was also formed in the existence of K compared with pure Sn-MFI. It was also found that the K-promoted Sn-MFI catalyst is more resistant to water and exhibits enhanced selectivity to F 2 Ac.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Zhong Zhang,Chao Liu,Xiujian Zhao
The lead chalcogenide quantum dots with a size smaller than 3 nm and good chemical stability were difficult to synthesize due to the poor chemical reactivity of commonly used phosphine-free chalcogen and lead sources. Here we report the synthesis of small and surface passivated PbSe quantum dots (QDs) by addition of SnCl2 as the nucleation promoting agent and PbCl2 as the in situ passivation agent. Common PbCl2 (dissolved in oleylamine, oleic acid, and 1-octadecene) and elemental Se (dissolved in oleylamine) were used to synthesize small PbSe QDs by addition of SnCl2 to promote the fast nucleation of PbSe nanocrystals. The sizes of the PbSe QDs are between 3 and 8 nm and are tunable by controlling the ratio of PbCl2/SnCl2 and the reaction time. High photostability of PbSe QDs approved by the XPS analysis and photoluminescence spectra of PbSe QDs was also achieved by the in situ formation of thin halide adlayers on the surface of QDs. This new method is green with accessible raw materials and simple in situ passivation scheme and will enable the broader utilization of PbSe QDs in ambient conditions in many optoelectronic applications.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 19
·10160-10165
·
IF 7.76
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Cu2ZnSn(S,Se)4 (CZTSSe) semiconductors have been a focus of extensive research effort owing to low-toxicity, high abundance and low material cost. Yet, the CZTSSe thin film solar cell has a low open-circuit voltage value that presents challenges. Herein, using GeSe2 as a new Ge source material, we have achieved a wider band gap CZTSSe-based semiconductor absorber layer with its band-gap controlled by adjusting the ratio of SnS2 : GeSe2 used. In addition, the Cu2Zn(Sn,Ge)(S,Se)4 thin films were prepared with optimal Ge doping (30%) and solar cells were fabricated to attain a respectable power conversion efficiency of 4.8% under 1.5 AM with an active area of 0.19 cm2 without an anti-reflection layer.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）