JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 15
·7502-7506
·
IF 5.968
Hechun Jiang,Pengcheng Dai,Zhenyu Feng,Weiliu Fan,Jinhua Zhan
Cu2ZnSnS4 (CZTS) is acknowledged as an alternative to traditional p-type semiconductors. Traditionally obtained CZTS, however, is mostly kesterite or stannite phase, which features a tetragonal crystal cell. Herein, novel orthorhombic CZTS has been synthesized via an ethylenediamine-assisted hydrothermal method. Ethylenediamine plays an important part in the construction of the orthorhombic phase. Kesterite CZTS was also obtained in an ultrapure water system without ethylenediamine. The structure was confirmed by XRD, XPS and HRTEM. The band gap of the orthorhombic CZTS is about 1.45 eV, which approaches the optimum value for solar photoelectric conversion. What's more, we found that this orthorhombic CZTS is metastable. After annealing at 500 °C, a phase transformation from the orthorhombic structure to the tetragonal kesterite structure was achieved. The photoelectric response was also characterised, which demonstrated its potential for application in photovoltaic devices.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Yin Qin,Bin Cao,Xiao-Ye Zhou,Zhuorui Xiao,Hanxiang Zhou,Zhenyi Zhao,Yibo Weng,Jianshuai Lv,Yang Liu,Yan-Bing He,Feiyu Kang,Kaikai Li,Tong-Yi Zhang
The development of efficient oxygen evolution reaction (OER) electrocatalysts is of vital importance for acidic water decomposition. Currently, the rutile structured RuO 2 is considered to be the best candidate and has been studied widely. However, the state-of-the-art rutile RuO 2 still suffers from unsatisfactory activity and stability, while other crystalline structures of Ru-based oxides are seldom reported as OER electrocatalysts. The present work, for the first time, successfully synthesizes orthorhombic (Ru, Mn) 2 O 3 electrocatalyst through cation exchange. The orthorhombic (Ru, Mn) 2 O 3 particles exhibit the outstanding electrocatalysis performance as OER electrocatalyst, showing an ultralow overpotential of 168 mV at 10 mA cm −2 in acidic water and good stability in 40 h of OER. The outstanding electrocatalysis performance is attributed to the distinct Ru d -band structure together with the larger surface density of Ru active site, which reduces the free energy of the rate-limiting step during OER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
·
2023
·Vol. 238
·期 3
·541-543
·
IF 0.3
Chuanguo Cui,Jinxiao Zhang,Zhiyin Xiao
C 61 H 50 Cl 2 Fe 2 I 12 N 12 , orthorhombic, Pbcn (no. 60), a = 13.0247(4) Å, b = 17.0204(5) Å, c = 34.1475(9) Å, β = 90, V = 7570.0(4) Å 3 , Z = 4, R gt
( F ) = 0.0694, wR ref
( F
2 ) = 0.1605, T = 293(2) K.
研究领域:
化学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Mu Yang,Hong-shang Peng,Fan-long Zeng,Feng Teng,Zhen Qu,Di Yang,Yi-quan Wang,Gen-xiang Chen,Da-wei Wang
Luminescent perovskite quantum dots (QDs) had attracted great attention by virtue of the merits of color-tunable and narrow-band emissions. However, sofar reported perovskite QDs suffered from instability more or less. In this work, a type of silica-coated orthorhombic CH 3 NH 3 PbBr 3 QDs (SiO 2 -QDs) with greatly improved stability was reported. The SiO 2 -QDs were one-pot synthesized using a reprecipitation-encapsulation method assisted with an amine functional silane, which not conly controlled the crystallization of QDs, but also encapsulated QDs with a silica layer simultaneously. More interestingly, the in situ encapsulation of silica shell induced the presence of orthorhombic perovskite that was thought to be unstable at room temperature. This is the first report of orthorhombic CH 3 NH 3 PbBr 3 QDs, as far as we are concerned. The orthorhombic SiO 2 -QDs exhibited narrow-band green luminescence with a quantum yield of 78%, and a high production yield of ∼70 wt%. Moreover, stability of SiO 2 -QDs was considerably improved due to silica-coating. White-LEDs were also successfully fabricated with the green SiO 2 -QDs and a red commercial phosphors using a noncontact configuration. These results demonstrated that the orthorhombic SiO 2 -QDs held great promise for high-performance display or lighting technology.
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
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2015
·
IF 2.169
Xinghao Lin,Yanming Zhao,Youzhong Dong,Quan Kuang,Zhiyong Liang,Danlin Yan,Xudong Liu
A metaphosphate NaFe(PO 3 ) 3 compound has been obtained by solid state method here. This title compound belongs to the orthorhombic structure with the space group of P 2 1 2 1 2 1 (No. 19) and lattice parameters of a = 14.3390(3) Å, b = 14.3374(2) Å, c = 14.3642(1) Å. Its structure can be described as made up of infinite (PO 3 ) 1− chains connected by FeO 6 octahedra, while the monovalent Na cations are located in the tunnels determined by the connection of PO 4 tetrahedrons and FeO 6 octahedrons. Besides, the morphology, vibrational spectra, magnetic and sodium deinsertion/insertion properties of NaFe(PO 3 ) 3 compound are also presented and discussed here for the first time, which can provide more information about the physicochemical properties of this metaphosphate compound.
研究领域:
无机化学
·
材料科学
·
固体化学
·
电化学
·
能源材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 4
·4769-4774
·
IF 3.83
Hongfei Liu,Chenjun Zhang,Zhiping Zhang,Xiangdong Meng,Xianghua Zeng
Orthorhombic Sc 2 Mo 3 O 12 films have been successfully prepared via spin coating technique followed by annealing at 500–750 °C. The phase composition, microstructure, morphology and negative thermal behavior of the synthesized Sc 2 Mo 3 O 12 films were investigated. XRD and XPS analysis indicate that as-deposited film is amorphous . Orthorhombic Sc 2 Mo 3 O 12 films can be prepared after post-annealing at 500–750 °C for 1 h. The crystallinity of Sc 2 Mo 3 O 12 films gradually improved with the increase of post-annealing temperature. SEM analysis shows as-deposited film is smooth and compact, and the grain size of Sc 2 Mo 3 O 12 film grows up as the post-annealing temperature increases. Variable temperature XRD analysis demonstrates that the synthesized orthorhombic Sc 2 Mo 3 O 12 films show stable thermo-chemical and anisotropic NTE property in 25–700 °C. The corresponding coefficients of thermal expansion (CTEs) of the orthorhombic Sc 2 Mo 3 O 12 film in a, b and c directions are −6.68 × 10 −6 °C −1 , 5.08 × 10 −6 °C −1 and −4.76 × 10 −6 °C −1 , respectively. The whole unit cell of the orthorhombic Sc 2 Mo 3 O 12 film shrinks and the volumetric CTE of the Sc 2 Mo 3 O 12 thin film is −6.36 × 10 −6 °C −1 , and the linear CTE is about −2.12 × 10 −6 °C −1 ( α v = 3 α l ).
研究领域:
材料科学
·
无机非金属材料
·
功能薄膜
·
热学性能
·
晶体结构
✓ 已验证
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Jie Guo,Min Lu,Xiaoyu Zhang,Siqi Sun,Ce Han,Yu Zhang,Xuyong Yang,Stephen V. Kershaw,Weitao Zheng,Andrey L. Rogach
Orthorhombic γ-CsPbI3 possesses the highest structural stability among the optically active (light-emissive) CsPbI3 perovskites. Here, we make use of a seed-assisted heteroepitaxial growth to fabricate seed/core/shell CaIx/γ-CsPbI3/CaI2 nanocrystals. Ultrasmall CaIx nanoparticles serve as seeds to template the Pb-centered octahedral arrangement which enables the formation of the γ-CsPbI3 phase and at the same time inhibit lattice strain by blocking the force transfer that otherwise leads to an octahedral twist and so improve the structural stability of the resulting nanocrystals. An outer shell composed from the same material, CaI2, isolates the formed γ-CsPbI3 nanocrystals from the environment, which also significantly improves their stability under ambient conditions. Optical and electrical studies indicate that the seed/core/shell CaIx/γ-CsPbI3/CaI2 structure possesses a shallower set of trap states as compared to cubic α-CsPbI3 nanocrystals. Light-emitting diodes utilizing these γ-CsPbI3 nanocrystals show a record high external quantum efficiency of 25.3%, high brightness of over 13600 cd/m2, and an operational lifetime of ∼14 h before reaching 50% of their initial luminance. These devices can repeatedly be illuminated over 650 times at ∼500 cd/m2 with no decline of brightness, which indicates their great commercial potential.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Wenqiang Ma,Huanhuan Zhang,MingXin Hu,Yingnan Guo,Lin Yang
Synthesis of CsPbBr3 nanocrystals (NCs) in the nonpolar solvent at room temperature has made great progress in recent years. However, most of strategies require the use of toluene, which is severely against their large-scale production in future commercialization due to the toxicity concerns. Here, we propose a facile and environmentally friendly strategy to synthesize CsPbBr3 NCs by using n-hexane as the solvent for the first time. Didecyldimethylammonium bromide (DD10AB) can well passivate NCs by the strong bonding of DDA+ with the NC surface, thus improving the colloidal stability. CsPbBr3 NCs with DD10AB post-treatment not only exhibit a narrow emission (FWHM ≈ 17.0 nm) with an ultrahigh PLQY of 96% but also maintain an orthorhombic structure and bright luminescence after 120 days of storage in air. Employing a DD10AB-CsPbBr3 film, a high-performance LCD displays the color gamut of 131% NTSC and 95% Rec.2020, indicating a great potential in the application field of liquid crystal display in the future.
研究领域:
材料科学
·
纳米技术
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Kejing Shang,Jie Feng,Bowen Zhang,Junwei Liu,Xing Ming,Xiaojun Kuang
In order to help understand the structural stability of KCoO2-type ternary nitrides AMN2, referring to perovskite structure, a tolerance factor t is proposed to describe the size effect on the phase/symmetry options of the experimentally accessible AMN2 nitrides. This leads to a range of t values above 0.946 for structurally stable KCoO2-type AMN2 nitrides with t values around 0.970 for the orthorhombic and tetragonal phase boundary. In contrast, most of AMN2 nitrides exhibit α-NaFeO2-type structure with t ∼ 0.898–0.946 and cations ordered or disordered rocksalt structure while t below 0.898. Employing the proposed criterion, the structure formation for other ternary AMN2 compositions with lanthanum and alkaline earth cations for the A sites were predicted, which was testified through the synthesis attempts and complemented by formation energy evaluations. The efforts to synthesize the ternary Lanthanide and alkaline earth-based AMN2 nitrides were unsuccessful, which could associate the structural instability with the large formation energies of lanthanide nitrides LaMN2 and the greater tolerance factor of 1.048 for BaTiN2. The experimentally already synthesized AMN2 nitrides could be categorized into three types with different tolerance factors, and scarce AMN2 nitrides with lower formation energies would be accessible using different synthetic routes beyond the traditional solid-state synthesis method.
研究领域:
材料科学
·
固体化学
·
晶体学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2019
·
IF 2.155
Huimin Song,Shengzi Zhang,Yunfei Li,Wang Liu,Zheshuai Lin,Jiyong Yao,Guochun Zhang
Three new pyrophosphates, CsNaZnP 2 O 7 , RbNaZnP 2 O 7 , and RbLiMgP 2 O 7 , were successfully obtained by the high-temperature solution method. The structures determined by single-crystal X-ray diffraction showed that the three compounds contained three-dimensional [Zn(P 2 O 7 ) 4/4 ] or [(Li 1/2 Mg 1/2 ) 2 (P 2 O 7 ) 4/4 ] frameworks, but they crystallized in different space groups, the monoclinic system P 2 1 / n for CsNaZnP 2 O 7 and RbNaZnP 2 O 7 , and the orthorhombic system Pnma for RbLiMgP 2 O 7 . All the compounds in the AA'MP 2 O 7 (A, A′ = different alkali metal ; M = Zn, Mg) family were summarized and compared. The thermal analyses and optical spectra analyses were performed on the title compounds. The band structures, density of states, and birefringence have also been investigated by the first-principles calculations.
研究领域:
无机化学
·
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Duan-Liang Wang,De-Fu Sun,Long-Yun Xu,Jie Liu,Ji-Yang Wang,Chuan-Ying Shen
Organic-inorganic hybrid new (C 8 H 18 N) 2 CdCl 4 single crystals were grown using a solution method, with its important physical properties, including in structure, phase purity, thermal analysis, absorption and diffuse reflectance spectra, and photoluminescence characteristic were systematically studied. (C 8 H 18 N) 2 CdCl 4 belongs to orthorhombic P 2 1 2 1 2 1 space group with zero-dimensional non-centrosymmetric structure. A high phase purity was confirmed by PXRD, FT-IR and Raman spectra, and a melting point of 120°C was determined by simultaneous thermal analysis. An absorption cut-off edge of 230 nm and optical band gap of 5.52 eV were determined, with high transmittance range of 300-1900 nm was detected. More importantly, a wide photoluminescence spectra covering visible range were observed, indicating a potential applications of (C 8 H 18 N) 2 CdCl 4 in white light luminescence. This work can supply an important guiding significance for searching new zero-dimensional hybrid d 10 -based metal halides with tetrahedron framework with nontoxic, high stability and some fascinating properties, especially those with white light luminescence performance.
研究领域:
材料科学
·
光学
·
晶体学
✓ 已验证
DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Yannan Li,Jun Cheng,Leiqing Hu,Niu Liu,Junhu Zhou,Kefa Cen
To study the relationship between crystal structures of amine-carbamates and regeneration energy consumptions, two new solid–liquid phase-changing solutions of ethylenediamine/N,N-dimethylacetamide (EDA/DMA) and ethylenediamine/N,N-dimethylformamide (EDA/DMF) were prepared to capture CO 2 efficiently and regulate the crystal structures of CO 2 absorption products (EDA-carbamates). The CO 2 absorption capacity and peak absorption rate of EDA/DMA and EDA/DMF solutions were both 30% and 67%, respectively, higher than those of EDA/water solution. EDA-carbamates in EDA/DMA and EDA/DMF solutions had the same molecular structures but different molecular arrangements (they belonged to orthorhombic and monoclinic crystals, respectively). The regeneration heat of EDA-carbamates in EDA/DMF solution (181.28 kJ/mol) was higher than orthorhombic EDA-carbamates in EDA/DMA solution (133.76 kJ/mol), which was attributed to the endothermic process (recrystallization process) during the transition from monoclinic EDA-carbamates to orthorhombic EDA-carbamates.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 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）