CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Qing Yao,Kaiyu Wang,Jie Zhang,Changqian Li,Chenyu Shang,Feitong Chen,Qi Huang,Qiqi Zhao,Weiwei Zhang,Xiaoyuan Zhan,Jianxu Ding
ABSTRACT Introducing inorganic cation into hybrid organic-inorganic perovskites (HOIPs) has attracted great attention because of the enhancement stabilities without sacrificing their excellent optoelectronic properties. Here, we introduce Cs and Rb into MAPbI 1.8 Br 1.2 single crystals (SCs) to dig out the mixed cation effect on optoelectronic performances and phase stabilities. Both Rb and Cs can increase the lattice capacity, which is sufficient to relieve the lattice stress caused by photon energy, thus achieving the purpose of stabilizing the lattice structure and inhibiting migration of halide ions, compared with MAPbI 1.8 Br 1.2 SC. On the other hand, the smaller polarity of Rb and Cs reduces the electron-phonon coupling, thus significantly inhibiting the migration of halide ions. Meanwhile, through planar photo-detectors, MA 0.9 Cs 0.1 PbI 1.8 Br 1.2 -based device behaves much excellent optoelectronic performance (R = 0.170 A/W, EQE = 51.39 %, D* = 4.42 × 10 12 Jones, on/off ratio: ~522).
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materiomics
·
2020
·
IF 5.797
Qidong Zhang,Lili Xi,Jiye Zhang,Chenyang Wang,Li You,Shanshan Pan,Kai Guo,Zhili Li,Jun Luo
The quaternary diamond-like compounds, A 2 Cu 3 In 3 Te 8 ( A = Cd, Zn, Mn, Mg), are a new class of thermoelectric materials recently proposed by complex structure design. Among them, the Zn 2 Cu 3 In 3 Te 8 compound possesses reasonable electrical transport properties but relatively high lattice thermal conductivity. Herein, the effects of Ag substitution on the phase stability and thermoelectric properties of Zn 2 Cu 3 In 3 Te 8 compound are reported. It is revealed that only the In sites show an appreciable tolerance for Ag doping. Ag substitution at the In sites introduces extra holes and thus results in improved electrical transport properties. Furthermore, the introducing of Ag lowers the sound velocities and enhances the phonon scattering of the Zn 2 Cu 3 In 3 Te 8 compound, which leads to a substantially reduction in lattice thermal conductivity. Finally, in virtue of the optimization in both electrical and thermal transport properties, the maximal zT value of Zn 2 Cu 3 In 2.8 Ag 0.2 Te 8 sample reaches 0.62 at 823 K, which is 43% higher than the pristine sample.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2021
·
IF 6.024
Yueli Liu,Qitao Li,Wenchao Zhang,Zifan Yang,Sijie Zhao,Wen Chen
All-inorganic CsPbI3 perovskite quantum dots (QDs) have attracted great attention since emerging as a new class of materials with superior light-harvesting properties and enhanced thermal stability compared to organic–inorganic hybrid perovskites. However, poor phase stability remains a bottleneck for practical applications. In the present work, CsPb(I1–xBrx)3 perovskite QDs are synthesized by Br doping to increase the tolerance factor for the improvement of phase stability, and the balance between the stability of solar cells and the power conversion efficiency (PCE) is considered by adjusting the Br doping content. It is found that the phase stability of CsPb(I1–xBrx)3 QDs is much improved, while their band gap increases from 1.77 to 1.89 eV when the Br doping content increases from 0 to 30%. CsPbI2.4Br0.6 QD-based perovskite solar cells (PSCs) achieve a proper balance between high PCE and stability; the PCE is 12.31%, approaching that of the CsPbI3-based PSCs (14.13%), and may retain 87% of the initial efficiency after 15 days of storage in ambient air.
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
Materials Horizons
·
2024
·
IF 12.2
Shuo Ding,Zhuoyuan Kong,Yipeng Shen,Piaoyang Shen,Chunyan Wu,Lei Qian,Xinyu Zhang,Long Hu,Hao Chen,Chaoyu Xiang
A novel ion anchoring strategy stabilizes perovskite phase, yielding ambient stable perovskite films and ultra-stable perovskite light-emitting diodes (PeLEDs) with an unprecedented operational half-lifetime over 37.2 years at 100 cd/m² and exceeding 27% efficiency, marking a new stability benchmark for next-generation display and lighting applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Weihua Ji,Jiadong Hou,Yang Miao,Chao Ma
High-entropy fluorite oxides exhibit application potential in thermal barrier coatings. The introduction of pyrochlore phase provides more exploration space for improving thermal properties. However, the phase stability and properties of dual-phase high-entropy oxides (HEOs) need to be further explored. In this paper, high-entropy fluorite single phase and fluorite-pyrochlore dual phase of (ZrHfPrLaSm)O 2-δ were synthesized, both of which exhibit excellent high-temperature phase stability at 1600 °C. The dual-phase HEOs have lower thermal conductivity and higher thermal expansion than single-phase. The thermal conductivity of dual-phase (Zr 0.195 Hf 0.195 Pr 0.195 La 0.195 Sm 0.22 )O 2-δ at 1100 °C is 1.36W·m −1 ·K −1 , which is 18.1 % lower than single-phase. The thermal expansion coefficient of dual-phase HEOs is increased to 11.8 × 10 −6 K −1 . Compared with single-phase structure, the coexistence of pyrochlore-fluorite structure increases oxygen defect content and lattice distortion degree, resulting in the enhancement of phonon scattering which reduces the thermal conductivity. This study provides guidance for the design and development of high-performance high-entropy ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Kunkun Nie,Xiaoyan Qu,Dongwei Gao,Binjie Li,Yanling Yuan,Qi Liu,Xinghua Li,Shaokun Chong,Zhengqing Liu
1T′-phase MoS2 possesses excellent electrocatalytic performance, but due to the instability of the thermodynamic metastable phase, its actual electrocatalytic effect is seriously limited. Here, we report a wet-chemical synthesis strategy for constructing rGO/1T′-MoS2/CeO2 heterostructures to improve the phase stability of metastable 1T′ phase MoS2 monolayers. Importantly, the rGO/1T′-MoS2/CeO2 heterostructure exhibits excellent electrocatalytic hydrogen evolution reaction (HER) performance, which is much better than the 1T′-MoS2 monolayers. The synergistic effects between CeO2 nanoparticles (NPs) and 1T′-MoS2 monolayers were systematically investigated. 1T′-MoS2 monolayers combined with the cocatalyst of CeO2 NPs can produce lattice strain and distortion on 1T′-MoS2 monolayers, which can tune the energy band structure, charge transfer, and energy barriers of hydrogen atom adsorption (ΔEH), leading to promotion of the phase activity and stability of 1T′-MoS2 monolayers for hydrogen production. Our work offers a feasible method for the preparation of efficient HER electrocatalysts based on the engineering phase stability of metastable materials.
研究领域:
材料科学
·
电化学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2017
·Vol. 101
·期 3
·1266-1278
·
IF 2.841
Lin Chen,YeHua Jiang,XiaoYu Chong,Jing Feng
Thermal barrier coatings (TBCs) are one of the most important materials in gas turbine to protect the high temperature components. RETa 3 O 9 compounds have a defect-perovskite structure, indicating that they have low thermal conductivity, which is the critical property of TBCs. Herein, dense RETa 3 O 9 bulk ceramics were fabricated via solid-state reaction. The crystal structure was characterized by X-ray diffraction (XRD) and Raman Spectroscope. Scanning electron microscope (SEM) was used to observe the microstructure. The thermophysical properties of RETa 3 O 9 were studied systematically, including specific heat, thermal diffusivity, thermal conductivity, thermal expansion coefficients, and high-temperature phase stability. The thermal conductivities of RETa 3 O 9 are very low (1.33-2.37 W/m·K, 373-1073 K), which are much lower than YSZ and La 2 Zr 2 O 7 ; and the thermal expansion coefficients range from 4.0 × 10 −6 K −1 to 10.2×10 −6 K −1 (1273 K), which is close to La 2 Zr 2 O 7 and YSZ. According to the differential scanning calorimetry (DSC) curve there is not phase transition at the test temperature. Due to the high melting point and excellent high-temperature phase stability with these oxides, RETa 3 O 9 ceramics were promising candidate materials for TBCs.
研究领域:
材料科学
·
热物理
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2023
·
IF 8.3
Fuhao Cheng,Ziqian Meng,Chufei Cheng,Jiadong Hou,Yufeng Liu,Bei Ren,Haiyan Hu,Feng Gao,Yang Miao,Xiaomin Wang
As gas turbine inlet temperatures continue to rise, new thermal barrier coating (TBC) materials must be developed urgently. This work investigated molten silicate corrosion, thermal conductivity , and high-temperature phase stability of a new class of high-entropy oxides (HEO) as potential protective coating materials. With composition tuning, high-entropy RE 2 B 2 O 7 (RE= Gd, Sm, Y, Pr, La; B Ce, Zr) can be transformed from pyrochlore to fluorite structures. They all exhibited phase stability when annealed at 1600 ℃ for 10 h and very low thermal conductivity (1.21–1.39 W·m −1 ·K −1 ) compared to conventional materials with better thermal protection. In addition, the CMAS corrosion resistance behavior of all samples at 1300 °C and 1500 °C was investigated, and it was found that the infiltration thickness decreased with increasing Ce content (down to ∼10 µm for 5 h at 1500 °C). The RE 2 Ce 2 O 7 had the most substantial CMAS resistance, forming a dense barrier layer composed of uniformly fine crystal grains during the reaction. The results of this study establish the foundation for future applications of RE 2 B 2 O 7 in thermal protection systems.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2023
·
IF 18.9
Mingxuan Lv,Ning Li,Gan Jin,Xiaoyan Du,Xutang Tao,Zhaolai Chen
Long carrier diffusion length is important for optoelectronic devices that require large electrode spacing or thick active layers. Formamidinium lead triiodide (FAPbI 3 ) perovskite is a promising candidate with ultra-long carrier diffusion length, but the existence of internal tensile strain and formation of ion vacancies make its photoactive black phase thermodynamically unstable. Herein, phase-stable FAPbI 3 -based single crystals with negligible absorption loss are achieved by synergy of iodide immobilization and compressive strain. Incorporation of guanidinium (GA + ) cations strengthens the interaction with the inorganic framework and suppresses the formation of iodide ion vacancies. Besides, the interface compressive strain introduced from the indium tin oxide (ITO) substrate counteracts the lattice tensile strain. The as-grown GA 0.015 FA 0.985 PbI 3 single crystals exhibit no phase transition after storage in air for 2,000 h. Moreover, the GA 0.015 FA 0.985 PbI 3 single crystals exhibit ultra-long electron carrier diffusion length of about 600 μm, which is a record value for perovskite materials and only half of silicon single crystals.
研究领域:
材料科学
·
光电材料
·
晶体工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Longkang Cong,Wei Li,Jiancheng Wang,Shengyue Gu,Shouyang Zhang
Thermal barrier coating (TBC) materials perform an increasingly important role in the thermal or chemical protection of hot components in a gas turbine. In this study, a novel high entropy hafnate (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 was synthesized by solution combustion method and investigated as a potential TBC layer. The as-synthesized (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 possesses a pure single disordered fluorite phase with a highly homogeneous distribution of rare earth (RE) cations, exhibiting prominent phase stability and excellent chemical compatibility with Al 2 O 3 even at 1300 °C. Moreover, (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 demonstrates a more sluggish grain growth rate than Y 2 Hf 2 O 7 . The thermal conductivity of (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 (0.73-0.93 W m −1 K −1 ) is smaller than those of components RE 2 Hf 2 O 7 and many high entropy TBC materials. Beside, the calculated thermal expansion coefficient (TEC) of (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 (10.68 × 10 −6 /K, 1100 °C) is smaller than that of yttria-stabilized zirconia (YSZ). Based on the results of this work, (Y 0.2 Gd 0.2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Hf 2 O 7 is suitable for the next generation TBC materials with outstanding properties.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yu Ji,Jian-Bin Zhang,Hao-Ran Shen,Zhan Su,Hao Cui,Tao Lan,Jia-Qian Wang,Yu-Hui Chen,Lihui Liu,Kun Cao,Wei Shen,Shufen Chen
The wide application of CsPbI3 nanocrystals (NCs) is limited due to their poor phase stability. We reported that Mn2+-CsPbI3 NCs have better optical performance and phase stability. With a suitable Mn/Pb ratio (5.0%), Mn2+-doped α-CsPbI3 NCs exhibited the best stability under UV irradiation, ethanol addition, and heating. Under UV irradiation and addition of ethanol, photoluminescence (PL) intensities of CsPbI3 NCs could be only preserved up to 35% (22 min UV irradiation) and 10% (ethanol addition), respectively, whereas, Mn2+-doped CsPbI3 (5.0%) exhibited much improved stability, and their intensities could be preserved up to 70% (22 min UV) and 58% (ethanol), respectively. It should be noted that crystal-phase stability could be maintained at least 7 h even at 120 °C. We believe that the improved stability in extreme conditions for α-CsPbI3 NCs can be further applied to optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 105
·期 8
·5490-5500
·
IF 4.186
Liang Xu,Lei Su,Hongjie Wang,Min Niu,Lei Zhuang,Kang Peng,Xingyu Fan,Hongfei Gao,De Lu
Pursuing novel thermal barrier–coating materials with lower thermal conductivity and high-temperature stability can simultaneously improve the working efficiency and service temperature of a gas turbine. In this study, a series of high-entropy RE 2 (Y 0.2 Yb 0.2 Nb 0.2 Ta 0.2 Ce 0.2 ) 2 O 7 (RE = La, Nd, Sm, Gd, Dy, and Er) oxides were prepared though solid-state reaction. Through tuning the rare-earth cations, an order–disorder transition occurs from certain partially ordered weberite structure ( C 222 1 ) to disordered defective fluorite structure ( Fm 3 ¯ $\bar{3}$ m ). All the high-entropy RE 2 (Y 0.2 Yb 0.2 Nb 0.2 Ta 0.2 Ce 0.2 ) 2 O 7 oxides possess low thermal conductivity in the range of 0.91–1.34 W m −1 K −1 at room temperature, which can be attributed to increased lattice anharmonicity and disorder, resulting in additional phonon scattering. Herein, we proved that the incorporation of heterovalent cations at B-sites in high-entropy A 2 B 2 O 7 crystals is an effective strategy to reduce the thermal conductivity without compromising the decrease of oxygen vacancy. Moreover, the high-entropy RE 2 (Y 0.2 Yb 0.2 Nb 0.2 Ta 0.2 Ce 0.2 ) 2 O 7 oxides show the relatively higher thermal expansion coefficients of 10.3–10.7 × 10 −6 °C −1 and excellent phase stability at elevated temperatures.
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
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