Journal of Energy Chemistry
·
2020
·
IF 7.216
Jin-Feng Liao,Ya-Ting Cai,Jun-Yan Li,Yong Jiang,Xu-Dong Wang,Hong-Yan Chen,Dai-Bin Kuang
The optoelectronic performance of CsPbBr 3 nanocrystal (NC) has been dramatically limited by the severe charge carrier recombination and its narrow light absorption range, which are anticipated to be resolved via coupling with plasmonic Au nanoparticle (NP). In view of this, CsPbBr 3 –Au nanocomposite is fabricated and further employed as a concept model to study the electronic interaction between perovskite NC and Au NP for the first time. It has been found that the excitation-wavelength dependent carrier transfer behavior exists in CsPbBr 3 –Au nanocomposite. Upon illumination with visible light ( λ >420 nm), photo-generated electrons in CsPbBr 3 can inject into Au with an electron injection rate and efficiency of 2.84 × 10 9 s −1 and 78%, respectively. The boosted charge separation is further translated into a 3.2-fold enhancement in CO 2 photocatalytic reduction activity compared with pristine CsPbBr 3 . On the other hand, when solely exciting Au NP with longer wavelength light ( λ >580 nm), the localized surface plasmon resonance (LSPR) induced hot electrons in Au NPs can transfer to CsPbBr 3 NC and further participate in photocatalytic reaction towards CO 2 reduction. The present study provides new insights into preparing plasmonic nanostructure to enhance the performance of perovskite based optoelectronic devices.
研究领域:
材料科学
·
光化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Junjie Lou,Bing Cai,Yihui Wu,Yinhua Lv,Xinhang Liu,Wen-Hua Zhang,Yong Qin
All-bromide inorganic perovskite CsPbBr 3 has attracted enormous attention due to its excellent stability against thermal and high humidity environmental conditions. The wide bandgap of CsPbBr 3 (2.3 eV) makes it a promising material for tandem and semitransparent solar cells. However, cesium based inorganic perovskite solar cells (PSCs) usually suffer from low device performance because of their imperfect film quality and mismatched energy levels with respect to charge transport materials. Herein, we describe a post-treatment strategy for CsPbBr 3 films using formamidinium bromide (FABr). With this protocol, FA + can partially substitute Cs + in the bulk phase of CsPbBr 3 , improving energy level alignment and enhancing charge extraction. Meanwhile, grain boundaries could be effectively passivated by a second phase (FA y Cs 4−y PbBr 6 ) generated in the ion exchange reaction . As a result, FABr-treated PSC exhibits a champion power conversion efficiency (PCE) of 8.25%, much higher than the pristine device with PCE of 6.74%. This work provides a feasible method to improve device performance of CsPbBr 3 PSCs while maintaining their outstanding stability.
研究领域:
材料科学
·
光伏技术
·
化学工程
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 43
·20942-20948
·
IF 6.97
Fei Tang,Zhicheng Su,Honggang Ye,Ye Zhu,Jiyan Dai,Shijie Xu
All-inorganic lead halide perovskite quantum dots (PQDs) of CsPbBr3 were synthesized at room temperature via a facile solution-based procedure. The cubic phase structure of the synthesized PQDs was judiciously identified through examining high-resolution transmission electron microscopy (TEM) images, selected area electronic diffraction (SAED) patterns and scanning TEM images of the PQDs. Variable-temperature photoluminescence (PL) spectra of the CsPbBr3 PQDs randomly embedded into a frozen solid of methylbenzene were measured in the temperature range of 5–180 K. It is found that both the linewidth and peak position of the measured PL spectra are abnormally almost temperature independent in the temperature range of interest. Some competing mechanisms, such as a competition between the bandgap blue shift induced by thermal lattice expansion and red shift induced by thermal escaping of localized excitons, and a competition between lineshape broadening by phonon scattering and narrowing by thermal escaping of localized excitons, are proposed to interpret the phenomena. Good agreement between the theoretical fitting and the experimental data leads to a state-of-the-art understanding of the temperature-dependent luminescence of the CsPbBr3 PQDs in a solid matrix.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 13
·46036
·
IF 1.86
Yanfang Hu,Weiqian Ma,Meilin Tao,Xueyan Zhang,Xiaohong Wang,Xiaoyu Wang,Li Chen
Herein, we present a strategy for supporting bromine as a catalyst for the oxidation of sulfides. In this strategy, branched poly(ethylene imine) was first decorated by magnetic oxide and then used to support liquid bromine to obtain solid polymeric bromine (M@PEI@Br) nanoparticles. Compared with free bromine, the stability of the M@PEI@Br nanoparticles improved obviously. The oxidation of thioanisole to methyl phenyl sulfoxide was chosen as a reaction model to evaluate the catalytic activity of the M@PEI@Br nanoparticles. All of the obtained results verify that the M@PEI@Br nanoparticles exhibited excellent catalytic efficiency and could accelerate the oxidation process under solvent-free conditions at room temperature; this highlighted the potential of decorated polymers to support active and unstable small-molecule organic catalysts. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46036.
研究领域:
催化化学
·
高分子材料
·
纳米科技
·
有机合成
·
绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2021
·
IF 6.186
Dongjing Liu,Lingtao Yang,Bin Li,Jiang Wu
Rice husk , as an abundant agricultural waste and renewable biomass, is adopted to produce porous silica which is used as a potential carbon-free adsorbent for mercury emission control of coal-fired power plants. The rice husk derived porous silica (RHS) exhibits a good Hg 0 adsorption capability with Hg 0 removal efficiency above 80% in the temperature range of 60–140 °C, which is plausibly due to the big specific surface area and mesoporous structure. The mercury removal performance of RHS can be evidently reinforced by KBr modification. The optimal KBr loading value and reaction temperature are 2 wt% and 140 °C, respectively. Acidic gas components, such as NO and SO 2 , both show slight inhibitive effects on Hg 0 adsorption process probably owing to the competitive adsorption or the elimination of adsorption sites.
研究领域:
环境科学
·
大气污染控制
·
材料科学
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吸附技术
·
能源工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Zhuoying Yang,Shaomin Peng,Ying Wu,Xiwen Ma,Ming Sun,Wei Song,Longmeng Wei,Ben Ma,Guichuan Xing,Lin Yu
Ultrathin pure bromide metal halide perovskite nanoplatelets (MHP NPLs) are expected to achieve high-purity pure blue and even deep blue emission. However, the optical properties of ultrathin NPLs are extremely unstable because they tend to self-assemble and fuse into large particles. Here, we find that the deep blue emitting NPLs can be stabilized by controlling the self-assembly behavior. By partial exchange of the surface ligand of aliphatic acid with aromatic acid, the self-assembly configuration can be effectively controlled, endowing stable face-to-face self-assembled configurations. The resultant NPL superlattices can retain blue emission for over half a month, while the control samples will red-shift within a few hours. The molecular simulation results reveal that the aromatic acid ligand has a strong passivation capacity on the NPL surface and moderate intermolecular van der Waals interactions. Therefore, by tuning the benzoic acid concentration, the intrinsic optical properties of individual NPLs can be stabilized in the form of self-assembly, avoiding crystal regrowth and exciton delocalization. This controllable self-assembly of ultrathin MHP NPLs benefits fundamental research in the field of perovskite nanocrystal superlattices and broadens the possibilities for perovskites for blue emission.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Mohamed I. Gadallah,Hassan Refat H. Ali,Hassan F. Askal,Gamal A. Saleh
A square wave voltammetric method for selective determination of meropenem (MRP) and ertapenem (ERP) was developed using pencil graphite electrode modified with poly (bromocresol green) (PGE/PBCG). The modified electrode film was characterized by scanning electron microscopy and electro-chemical impedance spectroscopy. Under the optimized conditions, the prepared electrode has good linearity over concentration range 1.0–60.0 and 0.3.0–75.0 μM for MRP and ERP, respectively. The developed method was validated according to ICH guidelines. In addition, the diffusion co-efficients of MRP and ERP were estimated to be 1.24 × 10 −6 and 9.09 × 10 −6 cm 2 s −1 , respectively using chronoamperometric technique. The developed method was highly sensitive and selective for the determination of MRP or ERP in the presence of their corresponding open beta-lactam ring degradation products. Consequently, it was successfully utilized for in-vitro and in-vivo applications in spiked and real plasma samples of healthy rabbits for their pharmacokinetic studies. Furthermore, the method was applied for the assay of the available dosage forms of both drugs.
研究领域:
分析化学
·
医学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jun Qin,Xiaomei Li,Yunfeng Bai,Feng Feng,Qiliang Pan,Jianguo Zhao
A novel mesoporous silica-deoxycholate (MS-NaDC) synergistic substrate was developed for room-temperature phosphorescence (RTP) sensing and analysis. The substrate exhibited rapid and strong RTP-inducing ability toward 9-bromophenanthrene (9-BrP). The formation mechanism of MS-NaDC synergistic substrate was analyzed and demonstrated. Five MSs with pore size range of 2.73–18.58 nm were synthesized and investigated, and the MS designated as LPMS2 was selected for its rapid RTP protection and good stability in dispersions. RTP in the presence of MS-NaDC substrate also shows good thermostability. Assistant inducers, such as cyclohexane, can be used together for further RTP enhancement. Finally, 9-BrP holds a fairly wide linear concentration range of 2 nM–3 μM, and a detection limit of 0.5 nM. All the results demonstrated the feasibility and application potential of the MS-NaDC substrate in RTP.
研究领域:
分析化学
·
材料科学
·
生物传感器
·
纳米医学
·
分子探针
·
环境监测
✓ 已验证
DOI
高影响因子
POLYMER
·
2016
·
IF 3.586
Zi-Long Li,Linhao Sun,Jimei Ma,Zhen Zeng,Hong Jiang
We demonstrate that polynorbornene containing dibromomaleimide side group is a novel polymer platform for post-polymerization modification. Polymer P0 was obtained through ring-opening metathesis polymerization of monomer 2 by using Grubbs third generation catalyst. Subsequently, P0 was chemically modified with 1-butanethiol and benzyl mercaptan to generate P1 and P2 , respectively. In this way, the dibromomaleimide units on polymer side chain were quantitatively converted to dithiolmaleimide moieties. All the polymer samples exhibited good thermal stability and relatively high glass transition temperature . Meanwhile, the effects of substituent and solvent on fluorescent properties of the polymers were elucidated.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Jiaqiang Liu,Xianliang Li,Yide Han,Junbiao Wu,Xia Zhang,Zhuopeng Wang,Yan Xu
Controlled synthesis of rare-earth metal–organic frameworks (RE-MOFs) is of great significance to match their emerging multifunctional luminescence applications. Herein, we propose a green and general solvent-free synthetic strategy for the adjustment of morphology and dimension of various RE-MOFs (RE = Eu, Tb, Er, Dy, Y, Tm) by using a tetraethylammonium bromide-assisted thermal-heating method. These self-assembled RE-MOF materials possess controllable morphologies and hierarchical structures while retaining the structural topology of MIL-78, proving that the strategy is a feasible and effective way in opening up large-scale synthesis of RE-MOFs. It is further found that the tetraethylammonium could be carbonized into carbon dots and encapsulated in Eu/Tb-MIL-78 to enhance the fluorescence emission intensities significantly, making the hierarchical Eu/Tb-MIL-78 MOF materials good candidates for the latent fingerprints recognition application. This work provides a novel strategy for effectively controlling the morphology and dimension of RE-MOFs materials with enhanced photoluminescence and has great potential in their scaling-up syntheses and exploring the new luminescence applications.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 30
·46200-46213
·
IF 5.19
Wang Yaqiao,Xia Xunfeng,Gao Shengwang,Zhao Xingpeng,Wang Guoying,Han Xue
A novel Ag/BiOBr/CeO 2 composite was successfully prepared for the first time, which had excellent performance in degrading sulfisoxazole (SSX) under visible light irradiation. The as-prepared samples were characterized by SEM, XRD, UV–vis DRS and BET et al. The composite of 10% Ag/BiOBr/CeO 2 showed the best photocatalytic activity and more than 99.5% SSX can be removed within 20 min. It exhibited the highest k value of 0.2428 min −1 , which was about 39.7 times higher than pure BiOBr (6.11 × 10 −3 min −1 ) and 22.1 times higher than BiOBr/CeO 2 (1.09 × 10 −2 min −1 ), respectively. The addition of Ag significantly improved the absorption rate of visible light and the separation rate of photogenerated electron–hole pairs. The initial pH and dosage of samples could have an influence on the photocatalytic activity. The radical trapping experiments proved that · O 2 − and h + were the main active species involved in photocatalytic degradation. Finally, the synthesized catalyst maintained excellent photocatalytic activity after 5 repeated cycles, which indicated the extraordinary stability and recyclability of Ag/BiOBr/CeO 2 . Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 2
·025038
·
IF 1.068
Han Jiang,Chunlei Wang,Changgui Lv,Shuhong Xu,Li Zhu,Ruohu Zhang,Yiping Cui
At present, the CH3NH3PbBr3 quantum dots (QDs) reported in the literature usually contain two synthesis steps: the initial preparation of CH3NH3Br via the reaction of flammable CH3NH2 and HBr, together with the subsequent formation of CH3NH3PbBr3 QDs. To avoid the use of dangerous CH3NH2, this work develops a novel one-pot method for synthesizing CH3NH3PbBr3 QDs using safe and commercially available reactants (CH3NH3Cl, KBr and PbCl2). It is found that ultrasonic treatment plays a key role during the synthesis of CH3NH3PbBr3 QDs. Without ultrasonic irradiation, it is not possible to synthesize CH3NH3PbBr3 QDs under heating or vigorous stirring. Aliquots of samples taken at different ultrasonic irradiation time intervals show a time-dependent redshift in the emission wavelength. This suggests the formation of CH3NH3PbCl3 QDs first, followed by the formation of CH3NH3PbBr3 QDs through ultrasonically promoted halide exchange. Moreover, mixed CH3NH3PbClxBr3−x QDs with a tunable emission wavelength can also be prepared through this one-pot method by controlling the ultrasonic irradiation time. In comparison to the previous two-step method, the current one-pot method is simpler, less time-consuming and does not use flammable CH3NH2. The as-prepared CH3NH3PbBr3 QDs show a comparable photoluminescence (PL) quantum yield (QY) to that of the literature. What is more, the ultrasonic time-controlled emission wavelength of CH3NH3PbClxBr3−x QDs also provides an alternative way of tuning QD emission to the traditional way of controlling the halide ratios.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）