JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Peng Deng,Huixin Wang,Xinbo Yang,Hui Ren,Qingjie Jiao
The development of high-energy ammonium perchlorate (NH 4 ClO 4 , AP)-based energetic materials is of great significance for promoting their potential applications. In this study, AP-based molecular perovskite energetic materials (H 2 dabco)[NH 4 (ClO 4 ) 3 ] were prepared via molecular assembly strategy with the facile one-pot reaction of AP, HClO 4 and triethylenediamine (dabco). The as-obtained sample was characterized by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR). The thermal decomposition and combustion performance was investigated by thermo-gravimetric/differential scanning calorimeter (TG-DSC), high speed photography and three-dimensional FT-IR. The results showed that combined with the oxidizer perchlorate and fuel dabco at the molecular level, ternary molecular perovskite (H 2 dabco)[NH 4 (ClO 4 ) 3 ] possessed a more stable thermal decomposition temperature (385.0 °C) than the monocomponent AP and the heat release is also as high as 3421 J g −1 . The thermal decomposition activation energy (181.070 kJ mol −1 ) of thermal decomposition of (H 2 dabco)[NH 4 (ClO 4 ) 3 ] had been expectably reduced from the activation energy (200.259 kJ mol −1 ) of high-temperature decomposition stage of AP, despite of low-temperature decomposition stage. The synergistic catalysis thermal decomposition mechanism based on the molecular perovskite structures was proposed. And the combustion performance demonstrated molecular perovskite (H 2 dabco)[NH 4 (ClO 4 ) 3 ] had a high energy-releasing efficiency. This work provides a proof-of-principle concept for the design and fabrication of high-performance solid propellants based on molecular perovskite (H 2 dabco)[NH 4 (ClO 4 ) 3 ].
研究领域:
材料科学
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化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Xingyu Pu,Jiabao Yang,Tong Wang,Shuaici Cheng,Qi Cao,Junsong Zhao,Hui Chen,Yixin Zhang,Tingting Xu,Ilhom Tojiboyev,Hadi Salari,Xuanhua Li
All-inorganic CsPbI 2 Br perovskite solar cells (PSCs) have received extensive research interests recently. Nevertheless, their low efficiency and poor long-term stability are still obstacles for further commercial application. Herein, we demonstrate that high efficiency and exceptional long-term stability are realized by incorporating gadolinium(III) chloride (GdCl 3 ) into the CsPbI 2 Br perovskite film. The incorporation of GdCl 3 enhances the Goldschmidt tolerance factor of CsPbI 2 Br perovskite, yielding a dense perovskite film with small grains, thus the α-phase CsPbI 2 Br is remarkably stabilized. Additionally, it is found that the GdCl 3 -incorporated perovskite film achieves suppressed charge recombination and appropriate energy level alignment compared with the pristine CsPbI 2 Br film. The noticeable increment in efficiency from 14.01% (control PSC) to 16.24% is achieved for GdCl 3 -incorporated PSC. Moreover, the nonencapsulated GdCl 3 -incorporated PSC exhibits excellent environmental and thermal stability, remaining over 91% or 90% of the original efficiency after 1200 h aging at 40% relative humidity or 480 h heating at 85 °C in nitrogen glove box respectively. The encapsulated GdCl 3 -incorporated PSC presents an improved operational stability with over 88% of initial efficiency under maximum power point (MPP) tracking at 45 °C for 1000 h. This work presents an effective ion-incorporation approach for boosting efficiency and long-term stability of all-inorganic PSCs.
研究领域:
材料科学
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能源研究
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Da Chen,Guangda Niu,Shiqiang Hao,Liubing Fan,Jing Zhao,Christopher Wolverton,Mengling Xia,Quanlin Liu
Halide double perovskites have attracted substantial attention for optoelectronic applications owing to their low toxicity and high stability. However, double perovskites have strict requirements in terms of the halide type, thus rendering many of their properties unchangeable, including the band gap, atomic number, and carrier transport. By introducing long-chain organic amines, the chloride site of double perovskites can be completely replaced by bromide. Using this strategy, two dimensions silver–indium–bromide double perovskites (PEA)4AgInBr8 and (i-BA)4AgInBr8 were successfully synthesized [(PEA)+ = C6H5(CH2)2NH3+, (i-BA)+ = CH(CH3)2CH2NH3+]. Density functional theory calculations and spectroscopy characterizations were performed to unveil the semiconducting behaviors and photoluminescence properties of the title compounds. Electrical characterization confirms their good carrier-transport property (μτ product: 2.0 × 10–3 cm2 V–1) and low dark current. Moreover, the presence of heavy atoms, together with the ultrastable baseline contributes to a high X-ray detection sensitivity (185 μC Gyair–1 cm–2), greater than that of most previous double-perovskite detectors. Our work lays the foundation for broadening the family of potential double perovskites, creating a new path for the realization of long-sought perovskites with low toxicity and high stability that retain good optoelectronic performance.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 50
·2103336
·
IF 13.281
Xuping Liu,Jihuai Wu,Chunyan Wang,Yuqian Yang,Deng Wang,Guodong Li,Yitian Du,Yuan Xu,Lei Zhang,Tingting Zhang,Lan Zhang
The carrier non-radiative recombination and instability of device caused by the inherent defects are main factors limiting development of perovskite solar cells (PSCs). During the fabrication process of a PSC device, perovskite films often produce Pb 0 and I 0 defects. This paper reports a strategy for synergistic optimization of perovskite films by defects passivation and surface modification. The doping of phthalide (PT) in the Pb-rich (CH(NH 2 ) 2 ) 1−x (CH 3 NH 3 ) x PbI 3 film can passivate lead cation defects, and the modification of 1-iodooctadecane (1-IO) can reduce halogen anion defects and improve stability of PSCs owing to its hydrophobicity. The PT and 1-IO optimized device achieves a power conversion efficiency (PCE) of 22.27%. The optimized PSCs remain 93.2% of the initial PCE when placed in air environment (relative humidity of 10%, 25 °C) more than 70 days. The PT and 1-IO synergistic optimization provides a novel strategy for improving the performance and stability of PSCs.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Zhenhai Xu,Jianming Gao,Zonghui Zhou,Yasong Zhao,Xuemei Chen
In order to clarify the enhancing mechanism of nano-TiO 2 (NT) on tricalcium silicate (C 3 S) paste, the hydration and microstructure of C 3 S with and without NT were investigated. Hydration properties were analyzed by setting time, compressive strength , hydration heat, Ca(OH) 2 content and relative content of C-S-H. Moreover, the microstructure of C 3 S paste was studied by pore structure and micromorphology. The results showed that seeding effect of NT promoted the chemical activity as well as hydration of C 3 S and more NT led to higher hydration degree. Besides, NT can increase the content of Ca(OH) 2 and the relative content of C-S-H, which also proved the enhancement effect of NT on C 3 S chemical activity and hydration. Furthermore, the seeding effect and filling effect of NT decreased total porosity, enhanced density and meliorated the microstructure of hardened C 3 S paste. Ultimately, the improved hydration and optimized microstructure introduced by NT enhanced the compressive strength of C 3 S paste.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 11
·1-7
·
IF 2.7
Yin Qianliu,Zhang Fanfan,Teng Yanlin,Peng Cong,Wang Chaonan,Jin Yonglong,Xu Meifeng,Xu Tian
Different concentrations of NH 4 Cl are introduced to MAPbI 3 precursor solution, planar MAPbI 3 perovskite films, and solar cells’ performance with or without NH 4 Cl have been studied. The NH 4 Cl/MAPbI 3 films exhibit increased grain size and narrowed grain boundaries. The light absorption of perovskite films with different concentrations of NH 4 Cl was also evaluated. To understand the growth of perovskite films with NH 4 Cl added to perovskite precursor solutions, XRD and XPS spectroscopy were conducted on different perovskite film samples. By adding NH 4 Cl, the MAPbI 3 film shows good crystal quality and the shift of Pb peaks indicates that NH 4 Cl is not physically mixed but chemically incorporated into MAPbI 3 films. We attribute the effect to Cl ions of NH 4 Cl combining with free lead ions of MAPbI 3 so as to fill the vacancy of volatile I ions in the NH 4 Cl–MAPbI 3 films. The 20 mg NH 4 Cl-based device showed an enhanced performance of a PCE of 13.67% compared to the device without adding NH 4 Cl with a PCE of 10.24%. The introduction of 20 mg NH 4 Cl achieved the best passivation effect. Using a 20 mg NH 4 Cl device, the trap density can be reduced to 0.84 × 10 16 cm −3 , resulting in more efficient charge removal from the surface and improved performance.
研究领域:
材料科学
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太阳能
·
化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
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2022
·
IF 3.574
Lei Chen,Changcheng Li,Qianping Ran,Xin Shu
Despite many studies of nanomaterials have been reported on the enhancement of cement-based materials, such as the pozzolanic effect of nano silica and flexural enhancement of fibers, there rarely are reports of the nanomaterials with both pozzolanic effect and shape-based enhancement. In this paper, anisotropic nanofibers were synthesized based on calcium silicates through hydrothermal method. Seed-mediated growth was conducted while SiO 2 nanoparticles served as the seeds and pseudo-wollastonite was used as the precursor. Importantly, the addition of the nanofibers can greatly improve the 28d flexural strength from 7.12 MPa to 8.99 MPa of the cement-based materials, which provides a new approach to realize the high performance of cement-based materials.
研究领域:
材料科学
·
土木工程
✓ 已验证
DOI
高影响因子
Materials Today Advances
·
2024
·
IF 8.1
Rongxin Wang,Zhichao Lin,Xinhua Ouyang
Additive engineering has been demonstrated to effectively mitigate carrier losses associated with high surface defects of perovskite at grain boundaries, bulk, and interfaces. Nevertheless, there are persistent challenges in enhancing the passivation effects at perovskite interfaces without compromising the carrier extraction efficiency. In this work, a feasible strategy incorporating multiple functional groups has been developed to simultaneously passivate defects at grain boundaries/interfaces, and to enhance charge transport by tuning permittivity ( ε r ). Two novel D-π-A type molecules, (Z)-3-((4'-(bis(4-methoxyphenyl)amino)-[1,1′-biphenyl]-4-yl)methylene)-5- fluoroindolin-2-one (TBI) and (Z)-2-(5-((4'-(bis(4-methoxyphenyl)amino)-[1,1′-biphenyl]-4-yl) methylene)-4-oxo-2-thioxothiazolidin-3-yl)acetic acid (TBR) were synthesized. Due to the introduction of the rhodanine acid acceptor, the ε r of the dye molecules is significantly increased ( ε r of TBR is 2.5, ε r of TBI is 1.9), making TBR and the ε r closer to that of spiro-OMeTAD ( ε r of spiro-OMeTAD is 2.9), which helps reduce the dielectric mismatch between the top surface of perovskite and HTL. Moreover, the strong coordination interactions with Pb 2+ /FA + and SnO 2 -layer of thioxothiazolidin-3-acetic acid of TBR effectively mitigate the defects at grain boundaries and interfaces. The PSC fabricated based on TBR shows improved V OC , J SC , and FF, resulting in a peak PCE of 23.74 %, along with remarkable stability by maintaining above 86 % of initial performance after 1440 h aging in the air with 60 % relative humidity. This work sets the stage for further improving the performance of perovskite solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yinguo Zhou,Lei Zhang,Kai Zhou
The halide perovskite/TiO 2 materials have been extensively employed for solar cells; however, they suffer from limited optoelectronic performance and stability in aqueous solution. In this manuscript, we employ a commercially available perylene dye, namely perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA), between the halide perovskite layer and the TiO 2 layer, to improve the photoelectrochemical properties of the prototypical CH 3 NH 3 PbI 3 /TiO 2 film in the aqueous solution. The incorporation of the perylene dye into the perovskite photoanode induces a photocurrent value twice as much as that offered by the bare perovskite-based film in the aqueous solution. The first-principles calculations suggest that the adsorption of the perylene dye molecule on the halide perovskite substrate is stable and the dye/perovskite interfacial structure depends on the perovskite surface terminations: for the PbI 2 -terminated perovskite surface, the perylene dye molecule interacts with the perovskite surface via the O⋯Pb contact; for the CH 3 NH 3 I-terminated perovskite surface, the perylene dye molecule interacts with the perovskite surface via the H⋯N contact. This study facilitates the fundamental understanding of the dye-sensitized halide perovskite materials for optoelectronic applications.
研究领域:
材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2024
·Vol. 8
·期 7
·2400088
·
IF 6
Lili Gao,Ke Hao,Ping Hu,Sheng Huang,Fan Yang,Deng Li,Shengzhong (Frank) Liu
Halide perovskites have gained significant attention in the field of photovoltaics and photocatalysis due to their exceptional optoelectronic properties. However, the exploration of other classes of 2D perovskite materials is limited. In this work, the photocatalytic performance of (HA)PbX 4 2D crystals embedded with MoS 2 in their bulk structure is investigated. The (HA)PbX 4 @MoS 2 composites are directly synthesized in a (HA)PbX 4 crystal solution. Notably, the (HA)PbI 4 @MoS 2 composite exhibits a remarkable 2.94-fold increase in H 2 evolution activity. Furthermore, the composite demonstrated stability in a (HA)PbX 4 (HA = histamine, X = I, Br, Cl)-saturated aqueous HX solution. The photogenerated electrons in (HA)PbX 4 are efficiently transferred to the MoS 2 sites, facilitating the reduction of protons to H 2 . In this study, the potential of hybrid 2D perovskite–MoS 2 composites is highlighted as promising visible-light photocatalysts for aqueous solution applications.
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2022
·
IF 4.042
Yue Tang,Lei Lei,Dan Yang,Jing Zheng,Qihang Zeng,Heng Xiao,Zhongrong Zhou
The lack of wear resistance is always a challenge for clinical applications of resin-based dental composites (RBDCs). In this study, the role of the calcium release from RBDCs in the adsorption and lubrication of salivary proteins was investigated, aiming to provide useful insights concerning the development of high-performance RBDCs. Three experimental RBDCs with distinct calcium-releasing capabilities were prepared using calcium phosphate particles as inorganic fillers. Salivary protein adsorption and film-forming on RBDC surfaces were characterized by atomic force microscopy, while the mechanical properties and lubricating effect of salivary pellicle were examined using nano-indentation/scratch techniques. Results showed that calcium release from RBDCs plays a crucial role in mediating the electrostatic interaction between salivary proteins and composite surface, thereby promoting the formation of salivary pellicle with a multi-layer structure. The mechanical properties and lubricating effect of the pellicle are positively related to the level of calcium release. In sum, for RBDCs with robust calcium release, saliva provides effective lubrication to resist composite wear. Incorporating calcium compounds is a promising way to improve the wear resistance of RBDCs in the oral cavity.
研究领域:
牙科学
·
生物材料学
✓ 已验证
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Qixian Xie,Lili Wan,Zhuang Zhang,Jingshan Luo
The cement industry is one of the largest contributors to global CO 2 emissions, which has been paid more attention to the research on converting the CO 2 released by the cement production process. It is extremely challenging to decarbonize the cement industry, as most CO 2 emissions result from the calcination of limestone (CaCO 3 ) into CaO and CO 2 . In this work, we demonstrate an in situ electrochemical process that transforms CaCO 3 into portlandite (Ca(OH) 2 , a key Portland cement precursor) and valuable carbonaceous products, which integrates electrochemical water splitting and CO 2 reduction reaction with the chemical decomposition of CaCO 3 . With different metal catalyst electrodes (like Au, Ag, In, Cu, and Cu nanowires electrodes), we have achieved various valuable carbonaceous products, such as CO, formate, methane, ethylene, and ethane during the electrochemical CO 2 process. Our work demonstrates a proof of concept for green and sustainable cement production.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）