CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xiaohui Ma,Liqun Yang,Xueni Shang,Mengjia Li,Deyu Gao,Cuncun Wu,Shijian Zheng,Boxue Zhang,Jiangzhao Chen,Cong Chen,Hongwei Song
The trap-assisted nonradiative recombination at grain surface and grain boundary (GB) of perovskite films impede the further improvement of power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). In addition, the poor moisture stability of perovskite films hinders the commercial application of PSCs. Herein, we report a multifunctional GB modification strategy where the wide-bandgap hydrophobic PbSO 4 modification layer is in situ formed at the GBs of perovskite films through the reaction between methylamine sulfate and PbI 2 . It is revealed that multiple functions are achieved after the formation of PbSO 4 modification layer, including crystallization improvement, defect passivation, and hydrophobicity improvement. As a result, the PbSO 4 modified device exhibits a PCE enhancement from 19.53% to 21.90% as compared to the control device. Moreover, up to 71% of its initial PCE is maintained for the unencapsulated PbSO 4 modified device after aging under a relative humidity of 80 ± 5% for 250 h. This work proposes an effective multifunctional approach to modify the GBs of perovskite films for the purpose of simultaneous increasement of PCE and stability.
研究领域:
材料科学
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能源技术
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光伏器件
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DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 30
·11316-11324
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IF 4.569
Yiqin Gong,Fan Ye,Qiliang Zhu,Wei Yan,Jianhua Shen,Kan-Hao Xue,Yihua Zhu,Chunzhong Li
Lead halide perovskite CsPbBr3 quantum dots (QDs) possess several desirable features which enable them to be promising candidates for photocatalysis. However, the instability caused by their inherent liquid-like ionic properties hampers their further development. Herein, this work employs the surficial molecular modification strategy and a multi-dimensional structure design to ease the instability issue. The additive 2-phenylethanamine bromide (PEABr) can serve as a ligand to compensate for stripping the amine ligands and passivate the surficial bromide vacancy defects of CsPbBr3 QDs in photocatalysis. In addition, PEABr acts as a reactant to form 2D and quasi-2D perovskite nanosheets. The addition of a small amount of these nanosheets into QDs can enhance their general stability due to their unique layered structures. Moreover, PEABr can trigger the phase transition of cubic CsPbBr3 into tetragonal CsPb2Br5. The newly formed Z-scheme homologous heterojunctions further improve the catalytic performance. Simulated photocatalytic dynamics reveals that our multi-dimensional structure favors decreasing the reaction barrier energy and then facilitating the photocatalytic reaction. Therefore, the electron consumption rate of our multi-dimensional perovskites doubles that of pristine CsPbBr3 QDs and also has superior long-term stability.
研究领域:
材料科学
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化学工程
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能源科学
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DOI
高影响因子
NORDIC PULP & PAPER RESEARCH JOURNAL
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2022
·Vol. 37
·期 4
·677-685
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IF 1.595
Huiming Fan,Jingkun Yang,Zhuoyao Ma,Hangtian Gao,Hongyan Mou,Jianan Liu
In order to solve the environmental problems caused by landfilling and incineration of Fenton sludge, realize the recycling of papermaking solid waste. In this paper, we explored the formation of a layer of calcium carbonate coating on the surface of Fenton sludge by crystallization coating in the Fenton sludge-[Ca(OH) 2 /H 2 O]-CO 2 three-phase reaction system to improve the brightness of Fenton sludge and apply it to the filling of paper. The effects of particle size, temperature, stirring rate and calcium hydroxide addition on crystallization coating effect were studied. The advantages and disadvantages of the coating effect are mainly judged by the brightness and dustiness of the powder material. The research results show that when the particle size is 38–48 μm, the temperature is 25 °C, the stirring speed is 600 r/min, and the ratio of calcium hydroxide to Fenton sludge is 2:1, the brightness of the composite can be increased from 3.56 % ISO to 64.24 % ISO.
研究领域:
环境科学
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材料科学
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造纸工程
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DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2016
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IF 3.42
Weijiang Yu,Guohua Jiang,Depeng Liu,Lei Li,Hua Chen,Yongkun Liu,Qin Huang,Zaizai Tong,Juming Yao,Xiangdong Kong
To reduce the inconvenience and pain of subcutaneous needle injection, the calcium sulfate and gelatin biodegradable composite microneedle patches with high aspect-ratio microneedles (MNs) and a flexible substrate have been developed. The microneedles with an aspect-ratio approximate 6:1 exhibit excellent mechanical property which can achieve 0.4 N for each needle. The cross-section views show the inside of microneedles that have abundant pores and channels which offer potential for different drug-release profiles. The preparation procedures, degradable property for the biodegradable composite microneedle patches are described in the paper. Insulin, the drug to control blood glucose levels in diabetic patients, has been embedded into the biodegradable composite MNs. The hypoglycemic effect for transdermal delivery of insulin is studied using diabetic Sprague-Dawley (SD) rats as models in vivo . After transdermal administration to the diabetic rats, the released insulin from biodegradable composite MNs exhibit an obvious and effective hypoglycemic effect for longer time compared with that of subcutaneous injection route. This work suggests that biodegradable composite MNs containing of insulin have a potential application in diabetes treatment via transdermal ingestion.
研究领域:
生物医学工程
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药物递送系统
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糖尿病治疗
✓ 已验证
DOI
高影响因子
Device
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2023
·
IF 0
Qiaoyan Ma,Mengen Ma,Liming Liu,Peng Yang,Wujie He,Xing Zhang,Jianzha Zheng,Cuiling Zhang,Chong Liu,Shaohang Wu,Yousheng Wang,Yaohua Mai
The defects presented at three-dimensional wide-band-gap (WBG) perovskites can be passivated by the in situ formed two-dimensional/three-dimensional bulk heterostructures incorporating long-chain alkylamine oleylammonium ligands. As-fabricated WBG perovskite solar minimodules (PSMs) with six subcells connected in series yield record efficiencies of 19.20% and 43.54% with superb high open-circuit voltage ( V oc ) of 7.40 V and 6.49 V (average V oc of 1.233 V and 1.08 V for each subcell) under one-sun and light-emitting diode (1,000 lux and 3,000 K) illumination, respectively. Such results represent an important step in the area of indoor photovoltaics and also further confirm that indoor WBG PSMs have great potential to achieve higher efficiency toward the theoretical limit.
研究领域:
材料科学
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能源工程
·
光学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 29
·1-12
·
IF 2.8
Zhang Zeqing,Liu Wei,Li Lin,Li Huan,Zhang Zhijun,Cheng Shuai,Rao Guanghui,Zhao Jingtai
In recent years, materials exhibiting multimodal luminescence properties from deep red to near-infrared (NIR) wavelengths have been a focal point of research, particularly in the exploration of applications within the realms of stress sensing and dynamic signature anti-counterfeiting. A pyroxene-type layered crystal structure compound, CaMgGe 2 O 6 : Mn 2+ , has been reported as a mechanoluminescent (ML) material. Upon incorporation into the host, Mn 2+ ions preferentially substitute for Mg 2+ ions, emitting deep red to near-infrared light (600–800 nm) within this six-coordinated [MgO 6 ] octahedral environment. The congruence of photoluminescence and ML spectra indicates that both types of luminescence originate from the same emissive center. The doping of Mn 2+ ions introduces impurity band, effectively reducing the optical band gap, as evidenced by ultraviolet diffuse reflectance measurements. Thermoluminescence results reveal three defect centers within the phosphor, whose concentrations decrease with Mn 2+ doping, correlating with a reduction in ML intensity. The ML mechanism of the phosphor is elucidated through the analysis of local piezoelectric properties within the crystal. Overall, this study may pave new pathways for the development of efficient near-infrared mechanoluminescent materials, showcasing potential applications within the biological domain.
研究领域:
材料科学
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光学
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生物医学工程
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DOI
高影响因子
Advanced Electronic Materials
·
2022
·Vol. 9
·期 2
·2200918
·
IF 7.633
Xingjie Lv,Guoliang Yuan,Tom Wu,Zhibo Yan,Ben Xu,Guanghua Liu,Jun-Ming Liu
Recently lead halide perovskite based solar cells have rapidly advanced and their power conversion efficiency (PCE) increased to 25.7%. The progress has been attributed to the super-long carriers’ lifetime (τ) and long diffusion length ( L D ) of the photocarriers, however it has been a challenge to precisely characterize and understand the super-long τ and L D of photocarriers. Here, a MAPbI 3 single crystal exhibits four different τ which increase with L D extending from nm scale to mm scale. The prior two lifetimes estimated by transient photoluminescence (TPL) spectra are in the range of ns which comes from the recombination of photocarriers in the tens of nm thick surface layer. In contrast, the third lifetime estimated by transient open-circuit voltage is hundreds of µs, which is a result of the excess photocarriers diffusing hundreds of µm to electrodes. Finally, the fourth lifetime estimated from the transient photoconductance is as long as sub-second since the low-density photocarriers under an electric field drift across the mm-scale high-quality single crystal. This study not only clarifies the physical mechanisms of four different lifetimes of photocarriers but also facilitates the design of novel electronics with the halide perovskite semiconductors.
研究领域:
材料科学
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Kangkang Yuan,Chen Shu,Kexin Meng,Wenjun Zhao,Guosheng Sun,Jien Zhu,Jin Chen,Yunlong Huang,Chengshun Li,Xiaotong Jin
Calcium zirconate (CaZrO 3 )-based fibrous membrane is a promising candidate in high-temperature areas for its high melting point, good phase stability up to 1900°C, low thermal conductivity, and low cost. To further enhance the high temperature flexibility of CaZrO 3 -based fibrous membrane without sacrificing stability, modification methods should be conducted. In the present work, a CaZrO 3 -BaZrO 3 dual-phasic structure was proposed to modify the high-temperature properties from the standpoint of phase competition. CaZrO 3 -BaZrO 3 fibrous membranes were prepared with the combination of the electrospinning method and pyrolysis process. The decomposition process, phase transformation, crystallize size, and microstructure evolution of CaZrO 3 -BaZrO 3 precursor fibrous membrane were characterized. The grain size, particle size, NIR reflectivity, high-temperature stability, fire retardancy, and high-temperature flexibility were also characterized and compared with other CaZrO 3 -based fibrous membranes. The higher thermal stability and flexibility of the CaZrO 3 -BaZrO 3 fibrous membrane at 1200°C would make it a good candidate for high-temperature insulating, high-temperature supporting, and high-temperature filtration.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 35
·8875-8882
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IF 5.16
Hong Li,Qing Zhao,Bo-Mei Liu,Jun-Ying Zhang,Zhi-Yong Li,Shao-Qiang Guo,Ju-Ping Ma,Yoshihiro Kuroiwa,Chikako Moriyoshi,Li-Rong Zheng,Hong-Tao Sun
Graphical Coordination environment engineering : Layered stoichiometric BaBiO 2.5 , synthesized by nontopotactic transformation of perovskite BaBiO 3 , features an unusual electron-density distribution and Bi−O bonding situation featuring one ionic and three covalent bonds, which give rise to peculiar near-infrared luminescence never seen before in any Bi-containing system (see figure). Engineering oxygen coordination environments of cations in oxides has received intense interest thanks to the opportunities for the discovery of novel oxides with unusual properties. Herein, the synthesis of stoichiometric layered BaBiO 2.5 by a nontopotactic phase transformation of perovskite BaBiO 3 is presented. By analyzing the synchrotron X-ray diffraction data by the maximum-entropy method/Rietveld technique, it was found that Bi is involved in an unusual chemical bonding situation with four oxygen atoms featuring one ionic bond and three covalent bonds, which results in an asymmetric coordination geometry. Photophysical characterization revealed that this peculiar structure shows near-infrared luminescence differing from that of conventional Bi-containing compounds. Experimental and theoretical results led to the proposal of an excitonic nature of the luminescence. This work highlights that synthesizing materials with uncommon Bi−O bonding and Bi coordination geometry provides a pathway to the discovery of systems with new functionalities. This could inspire interest in the exploration of a range of materials containing heavier p-block elements with prospects for finding systems with unusual properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 47
·19086-19093
·
IF 5.7
Xiaowei Zhu,Wei Liu,Guobin Zhu,Siyu Xiong,Deqin Chen,Xiuyun Lei,Laijun Liu,Chunchun Li
The present study reports on entropy-engineered perovskite ceramics (Ca1/3Sr1/3Ba1/3)(SnxTi1−x)O3 (CSBTO-xSn) with varying Sn-doping levels (x = 0.1, 0.2, 0.3), achieved through synergistic compositional design in both the A-sites and B-sites of the perovskite. Increasing the Sn-doping content induces a transition in configuration entropy from medium to high values. Notably, at an optimal composition of x = 0.1, the ceramic exhibits exceptional energy storage characteristics including an ultrahigh recoverable energy density (Wrec) of 5.05 J cm−3 and a high efficiency (η) of 82.56% at an electric field strength (Eb) of 540 kV cm−1 over a wide temperature range spanning from 30 to 100 °C and frequencies ranging from 1 Hz to 200 Hz. Furthermore, this ceramic demonstrates remarkable charge–discharge properties with a discharge energy density (Wdis) of 2.94 J cm−3 and a rapid discharge rate of t0.9 ∼ 67 ns. This study underscores the effectiveness of entropy engineering as a viable approach for developing advanced energy storage capacitors.
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
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2018
·
IF 2.559
Peihai Li,Kun Zang,Yingjie Li,Changshui Liu,Qingjun Ma
Extracellular proteases are often produced as pre-pro-enzyme and then undergo multiple processing steps to mature into the active form. The protease Epp, a virulent factor of Vibrio anguillarum , belongs to this family. Its maturation might be regulated by Ca 2+ via its polycystic kidney disease (PKD) domain, but the molecular mechanism is unknown. Herein, we report the crystal structure of the first PKD domain from V. anguillarum Epp (Epp-PKD1) and its specific Ca 2+ -binding capacity. Epp-PKD1 exists as a monomer , consisting of seven β-strands which form two β-sheets stacking with each other. One Ca 2+ is bound by the residues Asn3, Gln4, Asp27, Asp29, Asp68 and a water molecule with a pentagonal bipyramidal geometry. Incubating the apo Epp-PKD1 with Ca 2+ but not Mg 2+ , Mn 2+ , or Zn 2+ , enhances the thermal and chemical stability of Epp-PKD1, indicating its specific binding to Ca 2+ . Epp-PKD1 shares high similarity in both sequence and overall structure with that of Vibrio cholerae PrtV, a homologous protease of Epp, however, they differ in the oligomeric state and local structure at the Ca 2+ -binding site, suggesting maturation of PrtV and Epp might be differently regulated by Ca 2+ . Likely, proteases may take advantage of the structural diversity in PKD domains to tune their Ca 2+ -regulated maturation process.
研究领域:
生物化学
·
结构生物学
·
微生物学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
·
IF 5.742
Honggang Xie,Jiannan Xu,Can Gao,Jiejing Zhang,Chunxiao Gao,Xizhe Liu
CsPbI 3 triggers strong interest in the photovoltaic community for their promising photoelectric property and nonvolatility. However, CsPbI 3 layers with a-phase crystal structure are difficult for preparation, and these layers easily degrade to non-photoactive δ-phase at room temperature. Tuning the composition of precursor solutions is an important method for improving the properties of CsPbI 3 layers. Herein, we prepare inorganic a-CsPbI 3 perovskite solar cells using lead acetate as the lead source, which is different from conventional precursors with lead iodide as the lead source. The lead acetate precursor needs neither incorporating hydrogen iodide nor preparing PbI 2 complex, and it is shown to enlarge the grain size, improve the crystallinity and reduce the trap density of CsPbI 3 layers. By cooperating the lead acetate precursor with EDAI 2 additive, the power conversion efficiency (PCE) of devices increases from 9.2% to 12.9% and the photo-stability of these devices is improved simultaneously.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）