INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Haonan Liu,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Mo(VI)-containing phosphates are widely used in catalyses, ion batteries, and nonlinear optical (NLO) crystals. However, few strategies can effectively guide the syntheses of the Mo(VI)-containing phosphates. In this paper, three new Mo(VI)-containing phosphates, Cs3Mo12PO40, LiK(MoPO6)2, and Sr(MoPO6)2, with different dimensions have been successfully synthesized by adjusting the Mo/P ratios. Interestingly, Cs3Mo12PO40 is a classic Keggin-type polyoxometalate composed of zero-dimensional (0D) [Mo12PO40]3– clusters, whereas LiK(MoPO6)2 and Sr(MoPO6)2 have three-dimensional (3D) [MoO2O4P]∞ frameworks consisting of MoO6 octahedra and PO4 tetrahedra in a 1/1 ratio. Detailed structural comparisons of Mo(VI)-containig phosphates indicate that the Mo/P ratios have a significant effect on the structural dimensions. Further, the optical properties and thermal stabilities of Cs3Mo12PO40, LiK(MoPO6)2, and Sr(MoPO6)2 are also determined.
研究领域:
无机化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 32
·12571-12581
·
IF 5.7
Kaiyi Zhang,Fang Wang,Lei Zheng,Junqing Wei,Yongxu Hu,Yangyang Xie,Hongling Guo,Fengpu Zhang,Xin Lin,Zewen Li,Tianling Ren,Zhitang Song,Kailiang Zhang
2D Bi2O2Se is an intriguing building block for next-generation optoelectronic devices owing to its ultrahigh electron mobility and ultrabroadband photodetection capability. However, fully exploiting its advantages in advanced optoelectronic applications remains greatly challenging owing to the lack of in-depth understanding of the morphological evolution of Bi2O2Se crystals and efficient methods for enhancing their photoresponse. Herein, we developed a novel “cage-confinement” technique to achieve dimensionality-tunable growth of Bi2O2Se crystals in a space-confined CVD system. It can effectively control the key parameter of determining the dimensionality of crystals, referred to as the elastic strain energy of nucleation (ΔGs), by tuning the active area size of Bi2O3 seeds at a suitable flow rate of carrier gas. Furthermore, based on an optimized van der Waals transfer technique of crystals and electrodes, a sheet-shaped phototransistor of Bi2O2Se has a high responsivity (R) of ∼74 000 A W−1 and detectivity (D*) of ∼4.0 × 1011 Jones. Meanwhile, a wire-shaped device demonstrates an impressive R value of 300 000 A W−1, D* value of 3.9 × 1012 Jones and photoconductance gain (Gph) of 1.2 × 105. These results surpass most reported Bi2O2Se-based detectors and pave the way for the applications of 2D layered semiconductors in advanced optoelectronic devices and technologies.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sheng Pang,Jijun Lu,Liangwei Cong,Youpeng Xu,Yiwei Sun,Zhenqian Zhang,Jianwei Guo,Dong Wang,Xiao Yang,Guoyu Qian,Zhi Wang
3D construction or pore-forming of carbon nanosheets brings the materials exceptional energy storage performance. However, these strategies involve complicated procedures and challenging conditions. Herein, based on the structural regulation of a MAX phase, a facile method was proposed to prepare MAX-derived carbon (MDC) with dual tunability of dimension and pore structure via molten salt electrochemical etching-gaseous sulfur delamination coupling. Polyhedral structure Ti 2 SC and highly oriented structure Ti 2 SC were transformed into 3D Mesopore carbon nanoshells (3D Meso-CNSL) and 2D Mesopore carbon nanosheets (2D Meso-CNST) in one step. By matching the decomposition voltage of TiCl x with that of PS-Ti 2 SC, Cl 2 gas generated in situ was employed to enhance the porosity of the 3D Meso-CNSL, resulting in the formation of 3D meso/macro-porous carbon nanoshells (3D Meso/Macro-CNSL) with doubled pore volume (1.45 cm 3 g −1 ) and specific surface area (649.97 m 2 g −1 ). The 3D Meso/Macro-CNSL exhibits excellent capacity performance and cycle stability under high current density. The capacities are 674.8 mAh g −1 and 501.5 mAh g −1 after 1000 cycles at 5 A g −1 and 10 A g −1 , respectively. It is the first report on the direct delamination of MAX phases into 3D nanomaterials, presenting a new pathway for the precise regulation of the nanostructure of the MDCs.
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
CHEMISTRY OF MATERIALS
·
2022
·
IF 10.508
Yuqi Fan,Qi Liu,Zilong Zhang,Shui-Yang Lien,Yi Xie,Wanzhen Liang,Peng Gao
Lead-free halide double perovskites (LFDPs) arouse great interest as environmentally friendly substitutes to the state-of-the-art lead halide perovskites. However, most halide LFDPs feature large bandgaps that afford weak visible-light absorption. Herein, we synthesized and systemically studied the single-crystallographic, physical–chemical, band structural, and electronic properties of a series of multidimensional Au-based lead-free hybrid polymorphs, [(NH3CH3)2(AuI4)(AuI2)], [(NH2CHNH2)(AuI4)(AuI2)], [NH3(CH2)nNH3][(AuI4)2] (n = 2, 3), [NH3(CH2)nNH3][(AuI4)(I3)] (n = 4, 5, 6), and [NH3(CH2)nNH3]2[(AuI4)(AuI2)(I3)2] (n = 7, 8, 9). Among these two-dimensional (2D) perovskite-related and zero-dimensional nonperovskite polymorphs, we found an abnormal variation of structural dimensionality with increasing the size of A-site cations. These polymorphs displayed ultrabroad absorption ranges (200–1300 nm) and tunable low indirect bandgaps (0.93–1.18 eV). Combined single-crystallography and Hall effect measurements demonstrate that the I3– conduces to the formation of 2D perovskite structures related by connecting with the (AuI4)− sheets and also the charge transport properties. Consequently, [NH3(CH2)5NH3][(AuI4)I3] and [NH3(CH2)8NH3]2[(AuI4)(AuI2)(I3)2] showed high spectroscopic limited maximum efficiencies of 28.4 and 20.5%, respectively, with a film thickness of 500 nm. Our findings bring the Au-based polymorphs to the forefront of study on lead-free low-bandgap perovskites for optoelectronics and reveal the unique rule of dimensionality engineering in such materials.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Haochang Chen,Shunzhe Zhang,Hao Liu,Kaifeng Wang,Yujie Chen,Hua Li,Xiaobiao Zuo,Hezhou Liu
Cobalt tetraoxide (Co 3 O 4 ) is regarded as a promising anode material for Li-ion batteries owing to its high theoretical capacity (890 mAh g −1 ), simple preparation, and controllable morphology. Nanoengineering has been proven to be an effective method for producing high-performance electrode materials . However, systematic research on the influence of material dimensionality on battery performance is lacking. Herein, we prepared Co 3 O 4 with various dimensionalities (one-dimensional (1D) Co 3 O 4 nanorod (NR), two-dimensional (2D) Co 3 O 4 nanosheet (NS), three-dimensional (3D) Co 3 O 4 nanocluster (NC), and 3D Co 3 O 4 nanoflower (NF)) using a simple solvothermal heat treatment method, and their morphologies were controlled by varying the precipitator type and solvent composition . The 1D Co 3 O 4 NR and 3D samples (3D Co 3 O 4 NC and 3D Co 3 O 4 NF) exhibited poor cyclic and rate performances, respectively, while the 2D Co 3 O 4 NS exhibited the best electrochemical performance . The mechanism analysis revealed that the cyclic stability and rate performance of the Co 3 O 4 nanostructures are closely related to their intrinsic stability and interfacial contact performance, respectively, and the 2D thin-sheet structure can achieve an optimal balance between the two, resulting in the best performance. This work presents a comprehensive study on the effect of dimensionality on the electrochemical performance of Co 3 O 4 anodes, providing a new concept for the nanostructure design of conversion-type materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Qihao Sun,Bao Xiao,Leilei Ji,Dou Zhao,Jinjin Liu,Wei Zhang,Menghua Zhu,Wanqi Jie,Bin-Bin Zhang,Yadong Xu
All-inorganic Cs 3 Bi 2 I 9 (CBI) halide perovskites are sought to be candidate for photoelectrical materials because of their low toxicity and satisfactory stability. Unfortunately, the discrete molecular [Bi 2 I 9 ] 3− clusters limit the charge-transport behaviors. Herein, the defect halide perovskite based on trivalent Bi 3+ is expanded to Cs 3 Bi 2 I 6 Br 3 (CBIB). Centimeter-size CBIB single crystal ( Φ 15 × 70 mm 3 ) was grown by the vertical Bridgeman method. The powder X-ray diffraction analysis shows that CBIB has P 3 ¯ m 1 structure with lattice parameters of a = b = 8.223 Å, c = 10.024 Å, α = β = 90° and γ = 120°. The density functional theory (DFT) calculations demonstrate that the charge density distribution was enhanced after the dimensional expansion. The enhancement of carrier transport ability of (00 l ) in-plane is characterized before and after dimensional improvement. The obtained CBIB (001) exhibited an electron mobility up to 40.03 cm 2 V −1 s −1 by time-of-flight (TOF) technique, higher than 26.46 cm 2 V −1 s −1 of CBI (001) . Furthermore, the X-ray sensitivity increases from 707.81 μC Gy −1 cm −2 for CBI (001) to 3194.59 μC Gy −1 cm −2 for CBIB (001) . This research will deepen our understanding of Bi-based perovskite materials and afford more promising strategies for lead-free perovskite optoelectronic devices modification.
研究领域:
材料科学
·
光电材料
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 106
·86885-86890
·
IF 3.84
Hechun Lin,Qianqian Luo,Wen-Yi Tong,Chunli Jiang,Rong Huang,Hui Peng,Lai-Chang Zhang,Jadranka Travas-Sejdic,Chun-Gang Duan
EuS and Gd2O2S nanocrystals with narrow size distribution are synthesized in high yields by the thermal decomposition of Eu(oleate)3 or Gd(oleate)3 in oleylamine using CS2 as the sulfur source. The dimensionalities of these nanocrystals can be facilely tuned by the addition of 1-dodecanethiol. The morphologies and crystal structures of EuS and Gd2O2S nanocrystals are characterized by TEM and XRD. The magnetic properties of the obtained nanocrystals are also investigated. The experimental results illustrate that CS2 is an effective sulfur source for the preparation of metal sulfide and lanthanide oxysulfide semiconductor nanocrystals.
研究领域:
材料科学
·
纳米科技
·
无机化学
·
半导体物理
·
磁性材料
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Shuhui Yang,Xi Ke,Qizan Chen,Runda Huang,Weizhe Wang,Kunqiang Wang,Kaixiang Shu,Chen Tu,Zhaoqiang Zheng,Dongxiang Luo,Haowei Huang,Menglong Zhang
Constructing mixed dimensional materials have been regarded as an outstanding approach to maximum the advantages from materials of different dimensions. In this work, we prepared a mixed dimensional photocatalyst based on Formamidinium lead bromide (FAPbBr 3 ) perovskite and 2D materials (2DMs). The aim of this work is to utilize distributions of the active sites in 2DMs, through growing FAPbBr 3 on the different position of 2DMs, the concentration of photogenerated charges is manipulated, thus conducting different reactions. A pre-treatment using HBr to increase the unsaturated bonds in MoS 2 presents significant influence on the FAPbBr 3 growth and its photocatalytic product. The scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) confirm that the perovskite nanoparticles were well loaded on the 2D materials. The photocatalytic process and the heterojunction arrangement are demonstrated by X-ray photoelectron spectroscopy (XPS), time-resolved photoluminescence (TRPL), electron paramagnetic resonance (EPR) and surface photovoltage microscopy (SPVM). By adjusting the weight ratios and growth of FAPbBr 3 on the top of 2DMs, the optimized composite photocatalyst (with 30 wt% of FAPbBr 3 ) exhibits remarkable photoactivity for oxidation of benzyl alcohol into benzaldehyde (30 wt% FAPbBr 3 @WS 2 performed 75.9% conversion in 4 h, approximately 9-fold than the pure 2DMs). Meanwhile, by growing FAPbBr 3 on the edge of 2DMs, benzoic acid is obtained as the product. Although longer reaction time is needed, the photocatalyst performs outstanding activity (30 wt% FAPbBr 3 @MoS 2 reached 84.5% conversion in 5 h).
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 24
·5270-5276
·
IF 6.569
Shiwei Liu,Jiale Chen,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
The dimensional reduction theory is applied to an A2O–P2O5–Bi2O3 system where P2O5 serves as a binary parent while A2O and Bi2O3 are regarded as dimensional reduction agents. Thus, three novel phosphates ACs5Bi4(PO4)2(P2O7)3 (A = K, Rb and Cs) have been prepared through the high-temperature solution method. Single-crystal X-ray diffraction measurements reveal that they all crystallize in the monoclinic space group P21/c (no. 14) and in their structures, two different kinds of P–O units, i.e. isolated PO4 tetrahedra and P2O7 dimers, are interconnected by Bi–O groups to construct a 3∞[Bi4(PO4)2(P2O7)36−] framework. Note that with the change of cationic size in their structures, the Bi3+ cations also exhibit flexible coordination, i.e. BiO5 and BiO6 polyhedra in KCs5Bi4(PO4)2(P2O7)3 and only BiO6 polyhedra in Cs6Bi4(PO4)2(P2O7)3, suggesting that combining the flexible coordination of Bi3+ cations with phosphates based on dimensional reduction theory is an effective strategy to guide the synthesis of new compounds.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 13
·2300064
·
IF 9
Guoqing Xu,Shuoshuo Zang,Hewen Liu
The evidence on deciphering nucleation and growth of cesium lead halide perovskite crystals, and establishing the phase diagram of cesium lead halide perovskites of different dimensions is still lacking. In this work, a facile method for the synthesis of cesium lead bromide crystals of different molecular level dimensions at room temperature is presented by varying the OA/OAm ratios without changing the proportions of Cs and Pb precursors. Bromide ions are gradually released in the systems through the gamma-ray radiation chemistry of bromobenzene. As the volume ratios of OA/OAm increase, different products such as CsBr, Cs 4 PbBr 6 (0D), white δ -CsPbBr 3 (1D), γ -CsPbBr 3 (3D) associated with PbBr 2 sheets, and γ -CsPbBr 3 are obtained in order. 1D δ -CsPbBr 3 can be transformed into 2D CsPb 2 Br 5 through CsBr stripping in water. The phase diagram established in this work is helpful for understanding the nucleation and growth mechanism of Cs–Pb–Br perovskite crystals of different dimensions. The nucleation of Cs–Pb–Br perovskite crystals is driven by the supersaturation of either CsBr or PbBr 2 caused by varying OA/OAm ratios, i.e., 0D Cs 4 PbBr 6 at the supersaturation of CsBr, while 3D γ -CsPbBr 3 at the supersaturation of PbBr 2 . 1D perovskite is the intermediate state between 0D and 3D perovskites.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 35
·355701
·
IF 3.953
Guoying Yao,Liang Zhao,Tao Zeng,Zhenyu Yang
Reduced-dimensional (RD) perovskites have shown attractive chemical and physical properties for optoelectronic applications. Incorporating large organic ligands enables infinite tunability in the components and structures. Theoretically, it is feasible to apply multiple types of organic ligands in a single RD crystal to achieve multiple-dimensional perovskites. However, the coexistence of different organic ligands commonly introduces competing crystal growths that inhibit the formation of a more complex crystal structure. Herein, we report a case of mixed-dimensional (MD) perovskite single crystal containing two types of sulfide-containing ligands. We show that the application of ketones can partially oxidize organothiol ligands in the precursor solution. The resultant disulfide-based ligands can be co-incorporated with the thiol-based ligand in a single MD perovskite crystal. X-ray diffraction confirmed that the structure contains both layered and isolated inorganic components constructed by face-sharing lead halide octahedra. Unlike conventional RD structures, the MD perovskite shows an enlarged bandgap with valence band maximum and conduction band minimum being spatially separated, and isotropic optical features, as revealed by x-ray diffraction, spectroscopies, and density functional theory computation.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Honglei Zhang,Xiang Luo,Kaiqi Shi,Tao Wu,Feng He,Hangqi Yang,Shanshan Zhang,Chuang Peng
Carbon-based solid acid catalysts represented outstanding hydrothermal and mechanical properties but lower catalytic performances and stabilities. Therefore, more comprehensive investigations should be conducted to optimize their catalytic performances. The correlations between catalytic performance, carbon dimensionality and composition of oxygen-containing functional groups of nanocarbon-based catalysts were investigated. The dimensionality of carbon materials had notable effect on the catalytic reactivity and the layered 2-D structure could maximize the solid/liquid interface and minimize the mass transfer resistance and thus favor the catalytic esterification. GO-50, prepared with 50 mL concentrated H 2 SO 4 , exhibited outstanding catalytic activity and had 3 times higher turnover frequency (TOF) value than that of H 2 SO 4 . In GO-50, the -SO 3 H groups were identified as the primary catalytic active sites, while the carboxyl groups enhanced the inherent activity of -SO 3 H, thus facilitating the esterification. The -COOH/-SO 3 H molar ratio played significant roles and desirable -COOH/-SO 3 H molar ratio would promote esterification significantly. The esterification kinetics catalyzed by GO-50 was studied and the apparent activation energy of esterification by GO-50 is 1.5 times lower than that by H 2 SO 4 . The esterification mechanism by GO-50 was also proposed. Furthermore, GO-50/Poly (ether sulfones) (PES) membrane was prepared and employed in esterification and the optimal reaction conditions were systematically studied.
研究领域:
材料科学
·
催化化学
✓ 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）