APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhen-Kun He,Qiang Sun,Zhongning Shi,Kaiyu Xie,Ali Reza Kamali
Spiky polycrystalline SnO 2 balls assembled from pyramid-shaped SnO 2 nanocrystals with surface oxygen vacancies were synthesized by a simple and facile in-situ molten salt oxidation method using SnCl 2 as the tin source and graphite as the surface reductant. In this method, perfect SnO 2 nanocrystals are first formed on the surface of graphite particles at 500 °C. By increasing the processing temperature to 700 °C, the formation of surface oxygen vacancy defects was confirmed, supported by various characterisation methods including Raman and XPS spectroscopy. A sharp increase in the bulk electrical conductivity of the samples was detected by exceeding the onset temperature corresponding to the formation of oxygen deficient SnO 2 crystals, at which the conductivity of the sample significantly outperformed that of commercial SnO 2 nanoparticles. The formation of oxygen vacancies on SnO 2 crystals is thermodynamically studied, and suggested to occur by surface carbon reduction of the crystals at sufficiently high temperatures. The enhanced electrical conductivity of oxygen deficient SnO 2 crystals can lead to a wider application of tin oxides in advanced electrical applications.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hangjun Ying,Tiantian Yang,Pengfei Huang,Zhao Zhang,Shunlong Zhang,Zhihao Zhang,Wei-Qiang Han
Alloying-type anodes including Si- and Sn-based materials are considered the most exploitable anodes for high-performance lithium-ion batteries. However, problems of poor kinetics properties and structural failures such as grain pulverization and coarsening hinder their large-scale application. Herein, SnO2/Si@graphite hybrid anodes, with nano-SnO2 and nano-Si thoroughly mixed with each other and loaded onto graphite flakes, have been prepared by a facile ball milling method. Attributed to the “synergistic effect” between SnO2 and Si, the mechanical stability and kinetics properties can be remarkably enhanced. Furthermore, graphite substrate supplies a fast electrically conductive path and buffers the volume expansion of active particles. Accordingly, SnO2/Si@graphite delivers 798.9 mAh g–1 at 200 mA g–1 and maintains 550.8 mAh g–1 after 1000 cycles at 1 A g–1 in half cells. Impressively, a high energy density of 431.4 Wh kg–1 (based on the mass of anode and cathode) can be obtained in full cells when paired with the NCM622 cathode. This work presents an effective strategy to exploit high-performance alloying-type anodes for LIBs by designing hybrid materials with multiple active components.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Mineral Processing and Extractive Metallurgy Review
·
2017
·
IF 1.219
Zijian Su,Yuanbo Zhang,Bingbing Liu,Yingming Chen,Guanghui Li,Tao Jiang
A selective reduction volatilization (SRV) process developed by the authors was effective to remove tin from the complex tin-bearing iron concentrates. It is reported that many gangue minerals of quartz, calcite, and fluorite are existent in the concentrates. Our previous studies investigated the effect of quartz and calcite on the removal of tin. In this study, the effect of fluorite (calcium fluoride) was conducted, and pure CaF2 was added into the tin-bearing iron concentrates to investigate how CaF2 affected the tin volatilization behavior under different roasting conditions. The effect of CaF2 on the phase transformation of SnO2 was also determined using SEM-EDS and XRD. The results indicated that SnF2 was much easier to volatilize than SnO under CO-CO2 atmosphere in the presence of CaF2, so the calcium fluoride in the concentrates was beneficial to promote the tin removal during the SRV process.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Yunteng Qu,Can Li,Long Wang,Yunzhi Gao,Jiancun Rao,Geping Yin
We designed and synthesized a layer-by-layer SnO 2 /Pt/graphene electro-catalyst through multi-microwave method. The experimental results show that the activity for the ethanol oxidation strongly depends on the content of graphene and the highest catalytic activity occurs at ∼30 wt%, followed by ∼40 wt%, and ∼20 wt%. Without any other metal component, the ultrathin SnO 2 /Pt/graphene exhibits enhanced not only EOR activity but also durability compared with Pt/graphene. More importantly, the differential electrochemical mass spectrometry (DEMS) study reveals that the layer-by-layer ultrathin SnO 2 /Pt/graphene composites induces improved selectivity to acetic acid (CH 3 COOH) and carbon dioxide (CO 2 ) compared to Pt/graphene. The present work sheds light on ways to optimize electro-catalysts for EOR by smartly tailoring the nanostructure of composition of materials based on platinum, metal oxide and carbon.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
AIP Advances
·
2018
·Vol. 8
·期 12
·
IF 1.653
Lian Yadong,Huang Xiaokun,Yu Ji,Tang Tong B.,Zhang Weiyi,Gu Min
Scrutinyite SnO 2 was synthesized by annealing SnO nanoparticles fabricated from micron-size SnO via ball milling. The isotropic as well as anisotropic chemical shifts of 119 Sn obtained by solid-state nuclear magnetic resonance method, were verified computationally using a pseudopotential method in density-functional theory. The results fit with 6-fold coordinated Sn. A linear relationship holds empirically between isotropic shift and coordination number divided by Sn-O average bond length in all polymorphs of tin oxides. When the annealing proceeded in an oxygen-free atmosphere, metallic tin, the rutile phase of SnO 2 and oxygen vacancies associated with permanent electric dipoles were also detected by thermal analysis and dielectric spectroscopy.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 85
·81809-81813
·
IF 3.289
Menghu Wang,Hang Ping,Hao Xie,Baoli Chen,Min Yan,Weijian Fang,Zhengyi Fu
A genetically modified bacterial surface not only serves as a confined environment for controlling the monodispersity of particle size, but also provides a carbon source in situ. The carbon coated SnO2 composite exhibits good lithium storage properties as an anode electrode, which are due to the ultrasmall size of the particles, the carbon coating and mesoporous structure.
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
RSC Advances
·
2014
·Vol. 4
·期 101
·57869-57874
·
IF 3.708
Jinzuan Wang,Ping Liu,Yanshan Huang,Jianzhong Jiang,Sheng Han,Dongqing Wu,Xinliang Feng
Two-dimensional graphene/SnO2/graphene (G/SnO2/G) hybrids with SnO2 nanoparticles sandwiched in graphene sheets have been constructed by a facile ionic self-assembly process. The resulting G/SnO2/G hybrids possessed flexible and ultrathin graphene shells that effectively enwrapped the SnO2 nanoparticles. When the hybrids were used as the anode materials in lithium-ion batteries (LIBs), their unique core–shell architecture provided double protection against the aggregation and volume changes of SnO2 nanoparticles, and ensured favorable transport kinetics for charge carriers. As a result, the hybrids exhibited a superior cycling stability (600 mA h g−1 over 60 cycles) and excellent rate capability (120 mA h g−1 at 5.0 A g−1).
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Huiqian Yang,Weiqiang Zhang,Qing Yuan,Jinsheng Zhao,Yuchao Li,Yu Xie
High performance of SnO 2 @C@HA ternary anode material was fabricated by microwave-assisted hydrothermal and subsequent calcination process in the presence of humic acid (HA) and super P. In the calcination process, tin hydroxide is converted to tin oxide and then be crystallized. For comparison purpose, two other composites including SnO 2 @C and SnO 2 @HA are also prepared, and the structures, morphology and electrochemical performances of these composites are investigated in detail. The results showed that the addition of HA improved the dispersibility of the SnO 2 nanoparticles and the specific surface area of the composite. Electrochemical measurement showed that the SnO 2 @C@HA anode exhibited high retention capacity during charge-discharge cycling as compared to that of the binary systems, which was attributed to the porous hierarchical structure and high conductivity of SnO 2 @C@HA. The reversible specific capacity of SnO 2 @C@HA anode can be maintained at 612.0 mA h g −1 after 500 cycles at a current density of 500 mA g −1 .
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2015
·Vol. 21
·期 14
·5617-5622
·
IF 5.731
Yuxin Liu,Ping Liu,Dongqing Wu,Yanshan Huang,Yanping Tang,Yuezeng Su,Fan Zhang,Xinliang Feng
Graphical Doping for better anode s: Boron-doped carbon-coated SnO 2 /graphene hybrids (BCTGs) were fabricated by hydrothermal carbonization of sucrose in the presence of SnO 2 /graphene (TG) nanosheets and phenylboronic acid or boric acid as dopant source to give BSTGs and subsequent thermal treatment (see figure; GO: graphene oxide). Owing to the dopant B atoms in the hybrid and its 2D core–shell architecture, the hybrid obtained with phenylboronic acid as B source exhibits outstanding cycle stability after 360 cycles and an excellent rate capability at high current density. Heteroatom doping is an effective method to adjust the electrochemical behavior of carbonaceous materials. In this work, boron-doped, carbon-coated SnO 2 /graphene hybrids (BCTGs) were fabricated by hydrothermal carbonization of sucrose in the presence of SnO 2 /graphene nanosheets and phenylboronic acid or boric acid as dopant source and subsequent thermal treatment. Owing to their unique 2D core–shell architecture and B-doped carbon shells, BCTGs have enhanced conductivity and extra active sites for lithium storage. With phenylboronic acid as B source, the resulting hybrid shows outstanding electrochemical performance as the anode in lithium-ion batteries with a highly stable capacity of 1165 mA h g −1 at 0.1 A g −1 after 360 cycles and an excellent rate capability of 600 mA h g −1 at 3.2 A g −1 , and thus outperforms most of the previously reported SnO 2 -based anode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2021
·
IF 2.936
Jing Wang,Chenchen Niu,Kaiwen Hu,Xiujian Zhao,Kai Xu
Rhenium (Re), a non-radioactive surrogate for technetium (Tc), was incorporated into the lattice of SnO 2 by reductive co-precipitation process at room temperature, and Re volatility from Re(SnO 2 ) under different conditions (in air and N 2 and with glass frit) at elevated temperatures was carefully investigated. Re began to evaporate from Re(SnO 2 ) both in air and N 2 at 400 °C, while Re exhibited a faster volatilization in air than in N 2 , as all Re was gone at 1200 °C in air, but ∼40% of Re still remained at 1200 °C in N 2 . Additionally, Re did not volatilize from Re(SnO 2 )-containing glass frit until 800 °C and only ∼15% of Re volatilized at 1200 °C, suggesting the loss of Re decreased by ∼30% points through incorporation of Re into SnO 2 before vitrification. The analysis of Re valence transition revealed that the reduced Re 4+ was easily oxidized to volatile Re 7+ in air, but in N 2 , Re 4+ disproportionated to form Re 7+ and the lower valence states of Re at temperatures from 600 °C to 1000 °C. In Re(SnO 2 )-containing glass frit, the formation of NaReO 4 during vitrification inhibited Re 7+ volatilization before 800 °C, while the presence of Re 4+ in the glass melt enhanced Re retention at temperature above 800 °C.
研究领域:
材料科学
·
核化学
·
环境科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xinmei Qi,Liwu Huang,Yungui Chen
The commercialization of lithium sulfur batteries faces great challenges, such as shuttle effect and low conductivity. Herein, we explore embedding anoxic oxide SnO2–x in a porous carbon matrix as a separator-modifying material for lithium sulfur batteries. This material can limit the size of SnO2–x particles and reduce their agglomeration through confining by the porous carbon (PC). As a result, more adsorption and catalytic sites can be obtained. Moreover, the oxygen vacancies in SnO2–x can change the electronic environment to enhance the adsorption and catalysis of polysulfides, resulting in the depression of the shuttle effect of the battery. Therefore, the lithium sulfur battery with the SnO2–x/PC-modified separator has excellent cycling performance. At a current rate of 1 C, it can provide a high initial discharge capacity of 1049.4 mAh g–1 and maintain a reversible specific capacity of 798.4 mAh g–1 after 300 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Wenli Wei,Jinmei Li,Qi Wang,Dong Liu,Jingye Niu,Peng Liu
Conductive supports could improve the electrical conductivity of the electrode in lithium–sulfur (Li–S) batteries but suffer from the shuttle effect originated from the polysulfide dissolution, while the hydrophilic metal oxides could avoid the shuttle effect but with poor conductivity. Herein, a facile approach was developed to fabricate hierarchically porous tin oxide (SnO2) nanoparticle-anchored tubular polypyrrole (T-PPy) as a sulfur host, in order to integrate the advantages of conductive supports and metal oxides but overcome their shortcomings. In the unique structure, the T-PPy nanotubes acted as a conductive network to not only improve the electrical conductivity of cathodes but also accommodate the volume expansion of the sulfur cathode during cycling as well as relatively confine the polysulfide diffusion, while the SnO2 nanoparticles served as a high-efficient polysulfide trap to mitigate the shuttle effect due to the chemical bond between SnO2 and polysulfides. Moreover, the hierarchically porous structure and therefore large surface area of the proposed S/(T-PPy)@SnO2 cathode were favorable for the accommodation of sulfur and lithium sulfides. Consequently, S/(T-PPy)@SnO2 with 64.7% sulfur mass content exhibited excellent cyclic stability with a decay rate of only 0.05% per cycle along with 500 cycles at 1 C, rate capability of 383.7 mA h/g at 5 C, and Coulombic efficiency above 90%, outstanding among most of the reported PPy-based sulfur cathodes and PPy-based ternary sulfur cathodes.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）