ADVANCED FUNCTIONAL MATERIALS
·
2016
·Vol. 26
·期 33
·6025-6032
·
IF 11.382
Yuyang Li,Guanghua Liu,Tengfei Cao,LiMin Liu,Jiangtao Li,Kexin Chen,Laifeng Li,Yemao Han,Min Zhou
Dense bulk samples of (Ag,In)-co-doped Cu 2 SnSe 3 have been prepared by a fast and one-step method of combustion synthesis, and their thermoelectric properties have been investigated from 323 to 823 K. The experimental results show that Ag-doping at Cu site remarkably enhances the Seebeck coefficient, reduces both electrical and thermal conductivities, and finally increases the figure of merit (ZT) value. The ZT of the Cu 1.85 Ag 0.15 SnSe 3 sample reaches 0.80 at 773 K, which is improved by about 70% compared with the unadulterated sample (ZT = 0.46 at 773 K). First principle calculation indicates that Ag-doping changes the electronic structure of Cu 2 SnSe 3 and results in larger effective mass of carriers, thus enhancing the Seebeck coefficient and reducing the electrical conductivity. The low electrical conductivity caused by Ag-doping can be repaired by accompanying In-doping at Sn site, and by (Ag,In)-co-doping the thermoelectric properties are further promoted. The (Ag,In)-co-doped sample of Cu 1.85 Ag 0.15 Sn 0.9 In 0.1 Se 3 shows the maximum ZT of 1.42 at 823 K, which is likely the best result for Cu 2 SnSe 3 -based materials up to now. This work indicates that co-doping may provide an effective solution to optimize the conflicting material properties for increasing ZT.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2012
·
IF 4.859
Mian Huang,Alexandre Dumon,Ce-Wen Nan
The doping effect of Si, In and Ge in Li 7 La 3 Zr 2 O 12 (LLZ) as the solid electrolyte was studied via conventional solid-state reaction. The crystal structure, cross-sectional morphology, element distribution and conductivity were characterized for the undoped and doped LLZ ceramics. Our results showed that Si and In doping deteriorate electrical properties of LLZ as electrolyte, while Ge doping obviously improves properties. Ge might thus be a promising element for further increasing the ionic conductivity of LLZ ceramics.
研究领域:
材料科学
·
固态离子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Changcheng Cui,Junjie Fu,Dongxing Kou,Yimeng Li,Hao Wei,Zucheng Wu,Wenhui Zhou,Zhengji Zhou,Shengjie Yuan,Yafang Qi,Shuping Pang,Zhipeng Shao,Sixin Wu,Guanglei Cui
The Cu 2 ZnSn(S,Se) 4 solar cells (CZTSSe) are emerging as a hot area of low-cost thin film photovoltaic technology owing to its non-toxicity and excellent photoelectric properties. However, the large open-circuit voltage deficit ( V oc,deficit ) caused by the inherently defective CdS/ CZTSSe heterojunction interface is still a huge challenge for improving power conversion efficiency. Herein, we reconstruct the heterojunction interface by inserting a CZTSSe:In into the CdS/CZTSSe heterojunction through an In 2 Se 3 post-deposition treatment. The local occupation of In 3+ at Zn 2+ and Sn 4+ sites decreases the disordered Zn- and Sn-related deep defects and generates benign In Zn donors within CZITSSe transition layer simultaneously, which effectively enhances the surface p-to-n conversion. The combination of chemical and field-effect passivation regulates the charge extraction and passivates the charge recombination. As a result, the In element-buried absorber enables the V oc boost from 488 to 527 mV with an impressive active-area efficiency of 13.59 %. These results demonstrate the great potential of the In element-buried absorber in alleviating the V oc,deficit and enhancing the performance of CZTSSe solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yanan Teng,Huan Liu,Qi Wang,Yan He,YongChang Hua,Chunping Li,Jie Bai
Garnet type Li 7 La 3 Zr 2 O 12 solid electrolyte exhibits excellent thermal stability and high ionic conductivity, which is an ideal solid electrolyte. However, it is found that the cubic phase is a high conductivity phase and the synthesis condition is harsh. Therefore, low temperature synthesis and partial element substitution are expected to prepare cubic phase LLZO. In this paper, the LLZO cubic phase structure is stabilized by electrospinning technology and high-priced cation substitution strategy, and the transportation efficiency of lithium ions is improved. The experimental results show that LLZO NFs inorganic filler with stable cubic phase structure is obtained when the molar amount of In 3+ is 0.2. The In 3+ with large ion radius replaces the Li + inside the crystal, effectively increases the lithium vacancy concentration, and increases the Li + transport path inside the crystal, and successfully doubles the ionic conductivity of the composite solid electrolyte at 60 °C (9.39 × 10 −4 S/cm). The lithium ions migration number and electrochemical window were increased to 0.19 and 5.2 V respectively. With excellent cycle performance (60 °C), it can cycle 2000 cycles at a high rate of 0.5 C charge and discharge, and the Coulomb efficiency has been close to 100 %. Li|PL-LILZO NFs (0.2)|LFP all-solid-state lithium batteries can light small bulbs at room temperature and have practical application prospects. Therefore, in the composite electrolyte, the increase of the lithium ions pathway inside the active inorganic filler crystal will also improve the comprehensive performance of the composite electrolyte for preparation.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingyu Yuan,Jie Li,Yang Xiao,Xinyi Zhu,Siyuan Wang,Yan Yang,Jinliang Zou,Yichao Yan
In this work, In-doped LiZnTi spinel ferrites were successfully synthesized at a low temperature (920 °C) using 2 wt% Bi 2 O 3 as a sintering aid. The effects of In 3+ doping concentration on phase formation, microstructure, gyromagnetic properties, and dielectric properties were investigated. Results showed that all samples exhibited a single spinel phase, and grain growth behavior was strongly influenced by In 3+ doping. Although saturation magnetization decreased with increasing In 3+ content, the real part of the magnetic permeability (μ') increased from 117 (x = 0.00) to 170 (x = 0.09), while maintaining low magnetic loss. Meanwhile, the dielectric constant showed an upward trend (ε' increased from 15.88 to 18.50) with minimal dielectric loss. Regarding gyromagnetic properties, the sample with x = 0.06 exhibited a narrow ferromagnetic resonance linewidth (ΔH) of 240.09 Oe. The combination of high dielectric constant and low linewidth suggests promising potential for low-loss microwave ferrite devices.
研究领域:
材料科学
·
电磁学
·
微波工程
·
固态物理
·
陶瓷材料
✓ 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）