JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 11
·H787
·
IF 2.588
Mi Ouyang,Zhiyan Fu,Xiaojing Lv,Bin Hu,Pingjing Wang,Senbiao Huang,Yuyu Dai,Cheng Zhang
Copolymer based on 4-(9H-carbazol-9-yl)-N,N-diphenylaniline (CDPN) and 3,4-ethylenedioxythiophene (EDOT) was electrochemically synthesized and characterized. Through electrochemical methods, FTIR spectroscopy and scanning electron microscopy (SEM) analysis, the resulting polymer was confirmed to be a copolymer rather than a blend or a composite of the respective homopolymers. Besides, the spectroelectrochemical and electrochromic properties of the copolymer (P(CDPN-co-EDOT)) films were investigated. According to the spectroelectrochemical analysis, the copolymer film revealed distinct electrochromic properties with four colors: claret red, green, cadetblue, and blue. At the neutral state of the copolymer, the π-π* transition absorption peak was located at 530 nm and the energy gap was calculated as 1.67 eV. The copolymer film showed a maximum optical contrast (ΔT%) of 36% in visible region with a switching time of 1.8 s and 43% in the near-IR region with a switching time of 2.5 s. The coloration efficiency (CE) of P(CDPN-co-EDOT) were calculated to be 332 cm2·C−1 (at 530 nm), 277 cm2·C−1 (at 810 nm) and 552 cm2·C−1 (at 1100 nm). Repeated cyclic voltammograms indicated that the copolymer had reasonable stability because of the existence of EDOT units.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2020
·
IF 6.984
Bin Xu,Chuanhe Ma,Xiaoshuang Lu,Yulin Liu,Qiao Zhang,Ye Chen,Pingxiong Yang,Junhao Chu,Lin Sun
Cu 2 ZnSn(S,Se) 4 (CZTSSe) has received considerable attention as the promising absorber for thin-film solar cells. For traditional selenization process, the issues of Sn-loss, lower S/(S + Se) ratio, and unsuitable back contact interface extensively exist in CZTSSe solar cells. In present work, SnSe and SnS powder is introduced during selenization process, respectively. The effects of SnSe and SnS powder on CZTSSe films and the Mo/CZTSSe interface have been comprehensively studied. We discover that SnS not only can provide the Sn-contained vapor in selenization process but also offer S-vapor. Due to the presence of Sn-contained vapor, the number of voids in the CZTSSe absorber and Mo/CZTSSe interface decreases remarkably and the Sn-loss is effectively suppressed. The thickness of Mo(S,Se) 2 layer is significantly reduced, and the S/(S + Se) ratio in CZTSSe bulk obviously increases owing to the presence of S-vapor. As a consequence, the open-circuit voltage and fill factor of the solar cell significantly increase and the CZTSSe solar cell with efficiency of 10.07% (total area) is successfully fabricated.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Bowen Zhang,Yiqi Zhang,Jiufu Zhu,Zhanchen Cui,Wei Wang,Zuosen Shi
High performance polymeric dielectrics are of critical importance for obtaining high carrier mobility and realizing low operating voltage in OTFTs. In this work, copolymers poly(methyl methacrylate) containing 4-fluorostyrene monomer were used as insulating layers for OTFTs devices of C10-DNTT. With the increase of 4-fluorostyrene, the threshold voltage shifted positively, and the random copolymer poly(4-fluorostyrene–methyl methacrylate–glycidyl methacrylate)-5 (P(FSt-co-MMA-co-GMA)-5) exhibited a threshold voltage lower to 1.8 V, a hole mobility of up to 0.518 cm2 V–1 s–1, and a dielectric constant value of 5.66. XRD spectra reveal that C10-DNTT has the best morphology at (001) peak as the dielectric copolymer contains 5% 4-fluorostyrene monomer.
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JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Xianzhao Shao,Maifang Zuo,Changchun Zhao,Wei Wang,Zhizhou Li
2,4-diamino-6-(4-pyridyl)-1,3,5-triazine (DAPT) was synthesized and analyzed by nuclear magnetic resonance and Fourier transform infrared spectroscopy , thermogravimetric and elemental analysis techniques as well as by high-resolution transmission electron microscopy. DAPT solubility (in tetrahydrofuran , methanol, ethanol, n-propanol, and isopropanol) in the 288.15–318.15 K range was measured using the static analytical technique. We also performed quantum chemical calculations using Gaussian 09 and determined influence of solvent polarity and solute-solvent interactions on DAPT solubility. Experimental results were treated by modified Apelblat and Buchowski-Ksiazaczak ( λh ) equations as well as by the Wilson and nonrandom two-liquid (NRTL) models. All four models showed excellent agreement. This study provides valuable data for the purification of DAPT at the preferential crystallization procedure.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Mei Hong,Bingyu Wang,Xiaoling Xu,Peng Bin,Jingyu Zhang,Qiang Zhang
The catalytic membrane reactor (CMR) is recognized as one of the most effective strategies to treat the organic wastewater system. Yet so far, inefficiency, lack of bactericidal ability, and serious membrane fouling have limited its further application. In this study, we designed a novel polyacrylonitrile (PAN) catalytic separation membrane loaded with gold nanoparticles (Au NPs) via a facile photopolymerization method. The Au NPs on the catalytic separation membrane (PAN-Au) surface can serve as a high-performance catalyst, and the ligand of the 4-vinylpyridine (4VP) acts as an efficient protecting ligand for Au NPs to avoid leakage and agglomeration. The PAN-Au membrane was applied to CMR, which can one-step catalytic separation of nitrophenols and methylene blue efficiently in a flow-through mode (up to 97.5% over multiple cycles of reuse). Even after contamination with organic dyes, the PAN-Au membrane can still recover the catalytic separation performance by self-cleaning. Moreover, a remarkable antibacterial (with an efficiency of ≈100%) activity of the PAN-Au membrane, with a strong correlation with the small-sized and well-distributed Au NPs loaded on the membrane surface . The tremendous catalytical, self-cleaning, and antibacterial performance of the PAN-Au membrane provides new insights for the rational design of flow CMR for industrial applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Ying Fang,Yuanyuan Meng,Chunming Yuan,Chunhui Du,Kun-Peng Wang,Shaojin Chen,Zhi-Qiang Hu
Organic fluorescent molecules with π-conjugated system have shown great importance in numerous applications including bioimaging and optoelectronics. Planar aggregation-induced emissive (AIE) organic compounds with efficient solid-state luminescence are rarely developed and urgently needed in various applications. In this work, highly planar 4-styrylbenzonitrile derivatives have been synthesized. Most of these compounds show strong AIE properties with hundred-fold fluorescent enhancement. Moreover, these molecules are deep blue emissive in solid state, exhibiting good to excellent fluorescence quantum efficiency. The single crystal analysis shows that adjacent molecules could form special J-type aggregation. The intramolecular rotations are efficiently restricted by various noncovalent interactions. These molecular arrangements could be essential for the observed strong emission in aggregated and solid state. This work has paved a new path to efficient AIE-active organic emitters with highly planar conformations from 4-styrylbenzonitrile structure.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jin Yang,Jianhao Zha,Qinan Mao,Heyi Yang,Lang Pei,Jiasong Zhong
Indoor plant cultivation has been receiving increased attention due to concerns about sustainable agricultural production. Phosphor-converted light-emitting diodes (pc-LEDs) offer substantial promise as lighting solutions for regulating plant growth. However, the quest for high-performance phosphors with precise responsiveness to far-red phytochromes poses a challenge. Our study proposes a chemical substitution strategy to develop near-infrared (NIR) phosphors, YAl3–xGax(BO3)4:Cr3+. Benefiting from Ga3+ replacement of Al3+, a red shift in the NIR emission of YAl3–xGax(BO3)4:Cr3+ is realized to attain a good alignment with far-red phytochrome absorption centering at 730 nm. The optimized YAl2.5Ga0.5(BO3)4:Cr3+ exhibits a favorable quantum yield of 71.8% and robust thermal stability of 101.0%@423 K, owing to local structural distortion and thermal repopulation caused by Ga3+ incorporation. The fabricated pc-LED combined with the phosphor yields an NIR output power of 40.9 mW and a photoelectric conversion efficiency of 15.4% at 100 mA. Plant growth experiments demonstrate that under NIR illumination from the devices, the average lengths of pea roots and stems gain 127 and 225% promotion, respectively, further highlighting the potential of YAl2.5Ga0.5(BO3)4:Cr3+ phosphors for applications in plant cultivation.
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CATALYSIS LETTERS
·
2024
·Vol. 154
·期 8
·4756-4767
·
IF 2.3
Liu Kande,Wang Sitan,Zheng Lishan,Lou Shifeng,Meng Xuan,Cao Fahai,Liu Naiwang,Shi Li
The catalytic performance of Hβ zeolite treated with different concentration of NaOH on the alkylation of tert-butanol with phenol was studied. The effect of NaOH concentration on the crystallinity, morphology, textural property and acidity of Hβ zeolite was studied by X-ray diffraction (XRD), scanning electron microscope characterization (SEM), N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR) and pyridine adsorption infrared spectra (Py-IR) techniques. A certain concentration of NaOH treatment can regulate the pore structure of Hβ zeolite and remove part of framework aluminum and framework silicon, thus achieving the purpose of regulating the pore structure and acidity of the catalyst. Though lower Bronsted to Lewis acid amount ratio when treated NaOH concentrations were 0.15 mol/L, leading to the increasing of selectivity to 4-TBP. The Hβ-0.2 M showed the high selectivity of 90.21% for synthesis of 4-tert-butyl-phenol (4-TBP), compared with the unmodified parent zeolite, the selectivity of 4-TBP improved 16.7%. Graphical Abstract
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INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
·
2024
·Vol. 56
·期 10
·596-612
·
IF 1.5
Xue-qi Zhang,Qing-xian Yue,Rui Ding,Jie Liu
Corrosion protection of steel bars in alkaline concrete environments poses a common challenge in marine engineering. One approach to mitigate steel bar corrosion is the addition of corrosion inhibitors to the concrete. In alkaline environments, the passivation of rebars occurs through anodic passivation coupled with the cathodic oxygen reduction reaction (ORR). The catalysis of ORR can expedite anode passivation. To investigate the corrosion inhibition of steel bars in alkaline environments, meso-tetra(4-carboxyphenyl)porphine (TCPP), known for its ORR catalytic properties, is selected. TCPP forms adsorption films on the surface of steel bars, facilitating the formation of passivation films. TCPP primarily adsorbs onto active sites on the surface of the passivation film, where lattice iron ions have leached. The adsorbed TCPP accelerates the formation of the passivation film through ORR catalysis, inhibiting the development of passivation film defects and enhancing the integrity and protection of the passivation film. The most significant effect is observed when the concentration of TCPP is 0.5 mmol/L. The physical adsorption of TCPP is primarily determined by the negative charge centers, namely the carboxyl group O and the pyrrole N. However, due to steric hindrance caused by the unrestricted rotation of the carboxyl benzene, the pyrrole N does not play a dominant role in chemical adsorption. Instead, the active site for chemical adsorption is the carboxyl group O. The adsorption process significantly reduces the diffusion coefficient of TCPP molecules, providing a robust and stable adsorption binding. Phthalocyanine molecules without carboxyl benzene groups adopt a planar structure, allowing them to form stable adsorption configurations on the iron surface through flat adsorption. This observation provides guidance for the design of novel metal phthalocyanine molecules. Specifically, the development of metal phthalocyanine molecules with modifying groups that are coplanar with the phthalocyanine ring and possess restricted rotation can achieve flat adsorption, improve coverage rate, and enhance adsorption configuration stability.
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PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2022
·
IF 6.535
Wen-luan Xie,Bin Hu,Ying Liu,Hao Fu,Ji Liu,Bing Zhang,Qiang Lu
Lignin pyrolysis involves complex radical reactions, whereas the radical chain process, especially the influence of aliphatic substituents , has been rarely studied. Herein, the typical β -O-4 lignin dimer, phenethyl phenyl ether (PPE), and three aliphatic substituted derivatives of PPE, namely α -OH substituted, β -CH 2 OH substituted, and α,β -disubstituted PPE ( α PPE, β PPE, and αβ PPE) were employed as model compounds. DFT calculations, electronic analyses, and fast pyrolysis experiments were combined to investigate three core steps of the radical chain mechanism in lignin pyrolysis, i.e., homolysis, hydrogen abstraction , and radical decomposition. The pathway involving successive C β -O homolysis → α -hydrogen abstraction → C β -O breakage of α -dehydrogenated radical is dominated for the pyrolysis of aliphatic substituted β -O-4 linked lignin, with the formation of phenolics . The hydrogen abstraction reactions at the C α site are obviously superior to those at other sites for PPE derivatives, due to the p- π conjugate stability. Notably, α -hydrogen abstraction can be significantly promoted by the π -electron-dispersing α -OH substitution. The decomposition step of dehydrogenated radicals can be facilitated by the electron-donating β -CH 2 OH substitution, where the C β -O breakage of the α -dehydrogenated radical is dominant. Totally, aliphatic substituents can improve the radical growth stage and change the competitiveness of the hydrogen abstraction and radical decomposition reactions. The fast pyrolysis experiments of PPE and α PPE gave direct proof that the generation of characteristic products from the radical chain process, i.e., benzaldehyde and phenylacetaldehyde, was enhanced by the α -OH substitution. The present work offers the potential to give a comprehensive image of the radical chain mechanism in lignin pyrolysis.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Shuo Song,Liwei Wang,Xinxin Guo,Hongyu Liu,Bingqiang Cao,Jinkai Li,Wenzhi Wang
The application of all inorganic halide perovskite quantum dots (PQDs) in the field of optoelectronic devices has made exciting progress. However, the preparation of CsPbX3·PQDs with high water stability is still a great challenge. In this article, the direct synthesis of CsPbCl3·PQDs in water using 4-chlorobutyric acid (CBA) and oleamine (OLA) as surface ligands was proposed for the first time. Transmission electron microscopy spectra show that the QDs synthesized in water have good crystallinity and monodispersity. At the same time, CBA-CsPbCl3·PQDs synthesized by this method continuously emitted light in water for more than 400 h. In contrast, OA-CsPbCl3·PQDs were almost completely quenched after only 20 min of mixing with water. X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and hydrogen spectroscopy nuclear magnetic resonance were used to verify the passivation effect of CBA on the surface of QDs. The carboxyl ligands provided by CBA form a stable hydrophobic shell on the surface of CsPbCl3·PQDs, which makes CsPbCl3·PQDs have excellent water stability. In this study, CsPbCl3·PQDs with excellent water stability were synthesized with CBA/OLA as the surface ligand for the first time, which provides an effective way to explore perovskite light-emitting diodes with good water stability.
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RSC Advances
·
2018
·Vol. 8
·期 8
·4119-4124
·
IF 2.936
Pengpeng Zhang,Qing Yu,Xue Min,Linbao Guo,Jiangjian Shi,Xiangyun Zhao,Dongmei Li,Yanhong Luo,Huijue Wu,Qingbo Meng,Sixin Wu
The annealing temperature of solution-processed Cu2ZnSn(S,Se)4 (CZTSSe) precursor films has been carefully optimized for favorable selenization. At higher temperature, more solvent will be removed, and the crystallinity of the precursor films can be improved. It is found that, although the crystallinity of selenized film is continuously enhanced by increasing the temperature, a dense CZTSSe film with round and large grains can only be achieved at medium high temperature ranging from 350 to 400 °C. Further investigation reveals that, in this regime, the carrier and defect densities are obviously reduced, leading to average photoelectric conversion efficiency (PCE) improved from 5.1% to 9.4%. An optimal annealing temperature of 380 °C is obtained and up to 10.04% of photoelectric conversion efficiency has been achieved.
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危险品化学品经营许可证（带存储）