Electrospun carbon nanofibers (ECNs) have been explored as an electrocatalyst and low-cost alternative to platinum (Pt) for triiodide reduction in dye-sensitized solar cells (DSCs). The results of electrochemical impedance spectroscopy (EIS) cyclic voltammetry measurements indicated that the ECN counter electrodes exhibited low charge-transfer resistance (Rct), large capacitance (C), fast reaction rates reduction. Although efficiency (η) ECN-based was slightly lower than Pt-based cells,...

Abstract The combination of a transition‐metal catalyst and organocatalyst was designed to achieve highly enantioselective system for the allylic dearomatization reaction naphthols with racemic secondary alcohols. desired β‐naphthalenones, bearing an all‐carbon quaternary center, were obtained in good yields high chemo‐ enantioselectivities. cooperative catalytic system, involving chiral iridium complex phosphoric acid, provided measurable improvements yields, enantioselectivities relative...

Electrolyte effects on electron transport and recombination at ZnO nanorods (nd-ZnO) were studied by electrochemical impedance spectroscopy (EIS) in dye-sensitized solar cells (DSSCs). Different electrolyte systems prepared gradually adding tert-butylpyridine (TBP) guanidinium thiocyanate (GuSCN) replacing LiI with 1-butyl-3-methylimidazolium iodide (BMII). The introduction of TBP GuSCN, the replacement BMII suppressed charge nd-ZnO/electrolyte interface, increased lifetime (τn), improved...

A novel polyfluorene with high triplet energy level the soluble conjugated homopolymer poly(9,9′-bis(2-ethylhexyl)-3,6-fluorene)) (P36EHF) is successfully synthesized and characterized. Preliminary results indicate that P36EHF could be a good host material for green blue phosphorescent complexes (see figure), making it wide-bandgap polymer suitable blue- or green-phosphorescent LEDs. Supporting information this article available on WWW under...

Flexible silica aerogel composites in intact monolith of 12 cm were successfully fabricated by reinforcing SiO 2 with electrospun polyvinylidene fluoride (PVDF) webs via electrospinning and sol‐gel processing. Three PVDF different microstructures (e.g., nanofibers, microparticles, combined nanofibers microparticles) regulating parameters. The as‐electrospun various impregnated into the sol to synthesize PVDF/SiO followed solvent exchange, surface modification, drying at ambient atmosphere....

An efficient organocatalytic Michael/aldol/hemiacetalization cascade reaction for construction of enantioenriched spirocyclic oxindoles fused with tetrahydropyrane has been developed. The desired highly functionalized 5′,6′-dihydro-2′H,4′H-spiro[indoline-3,3′-pyran]-2-one derivatives containing multiple stereogenic centers were obtained in moderate to high chemical yields and stereoselectivities.

Organosulfides are promising cathodes for lithium batteries but often suffer from sluggish kinetics and low cycle stability. Herein, we report an electron-deficient organosulfide (ED-OS), which is formed via electrochemical oxidation of thiuram monosulfide, a low-cost sustainable material. The ED structure (dimethylcarbamothioyl)thio can stretch the electron cloud adjacent C═S bond forming S radical lead to cleavage S-C on other side another radical. two radicals form S-S bonds individually...

Abstract Summary: A strategy to generate an efficient white‐light emission has been developed by mixing fluorescence and phosphorescence from a single polymer. Fluorene is used as the blue‐emissive component, benzothiadiazole (BT) iridium complex [(btp) 2 Ir(tmd)] are incorporated into polyfluorene backbone, respectively, green‐ red‐emissive chromophores Suzuki polycondensation. By changing contents of BT in polymer, electroluminescence spectrum polymer can be adjusted achieve emission....

A novel and efficient aerobic asymmetric cyclization reaction of cinnamaldehydes 1,3-dicarbonyl compounds through oxidative NHC-catalysis has been developed, it allows the synthesis a wide range enantiomeric enriched dihydropyranone derivatives in good yields with to excellent enantioselectivities. Various α,β-unsaturated aldehydes aliphatic aromatic substitution groups were well tolerated. The air was directly used as oxidant, which made this highly efficient, cheap, green manner.

The solubility of florfenicol form A in eight pure organic solvents (propionic acid, ethanol, 1-propanol, 1-butanol, 2-propanol, 2-methyl-1-propanol, 3-methyl-1-butanol, and 2-ethyl-1-hexanol) three binary (dimethyl sulfoxide + dimethyl 1-butanol) was measured by a laser dynamic method at temperature from 283.15 to 323.15 K. experimental results show that the mole fraction decreased according following order: ethanol > 1-propanol 2-propanol 1-butanol 3-methyl-1-butanol 2-methyl-1-propanol ≈...

Novel light-emitting phosphorescent polymers based on 3,6-carbazole with an iridium complex the backbone were synthesized by Suzuki polycondensation of A-A and B-B type monomers. Three difluoro-substituted phenylpyridine complexes different ancillary ligands (FIrptz, FIrpic FIrtmd) introduced into poly(3,6-carbazole) (PCz) backbone, causing distinct differences in photo- electroluminescence properties. The PL efficiency PCz-FIrtmd5 is as high 62% compared value 9%...

Green-light-emitting hyperbranched polymers with iridium complex as a core and 3,6-carbazole-co-2,6-pyridine branch were synthesized by Suzuki polycondensation. The highest occupied molecular orbital (HOMO) the lowest unoccupied (LUMO) levels of copolymers reduced gradually increasing content 2,6-pyridine units from 10 to 30 mol%. It was found that result incorporation pyridine moiety into polycarbazole backbone, device efficiencies could be significantly enhanced. A peak external quantum...

Abstract In this study, a relatively nontoxic single solvent, anisole, was successfully used to process polymer solar cells. Blends cast with anisole showed higher aggregation due lower solubility. Polymer led isolated regions that can trap charges in the phase anisole‐based cells, supported by photo‐charge extraction linearly increasing voltage (photo‐CELIV) technique. However, resulted bimolecular recombination decreased amount of polymer–PCBM interface as seen transient...

Magnetic particles modified with a dicationic polymeric ionic liquid are described as new adsorbent in magnetic solid‐phase extraction. They were obtained through the copolymerization of 1,8‐di(3‐vinylimidazolium)octane‐based vinyl‐modified SiO 2 @Fe 3 O 4 , and characterized by FTIR spectroscopy, X‐ray diffraction, vibrating sample magnetometry. The effective extraction organophosphate pesticides polycyclic aromatic hydrocarbons. Also, they can provide different performance for selected...

Abstract Organosulfurs are promising cathode materials for rechargeable metal batteries due to their high capacities, diverse structures, and electrochemical properties. Herein, the behavior of three organosulfur compounds, i.e., 4,4′‐thiobisbenzenethiol (TBBT), 1,4‐benzenedithiol (1,4‐BDT), diphenyl disulfide (DPDS), is revealed in room‐temperature sodium (Na) batteries, which show significantly improved performances when sodiated Nafion membranes used. Large oligomers can be formed during...

A conjugated copolymer based on alternating benzo[1,2-b;3,4-b']dithiophene (BDT) donor and dodecyloxy substituted benzo[c][1,2,5]thiadiazole (ABT) acceptor units was prepared for application in organic solar cells. power conversion efficiency (PCE) of ~3% with a short-circuit current (Jsc) 7.63 mA cm(-2), an open-circuit voltage (Voc) 0.71 V fill-factor (FF) 53.74% obtained under the illumination AM 1.5 irradiation (100 mW cm(-2)). Photovoltaic devices their transient properties blend...

Abstract The combination of a transition‐metal catalyst and organocatalyst was designed to achieve highly enantioselective system for the allylic dearomatization reaction naphthols with racemic secondary alcohols. desired β‐naphthalenones, bearing an all‐carbon quaternary center, were obtained in good yields high chemo‐ enantioselectivities. cooperative catalytic system, involving chiral iridium complex phosphoric acid, provided measurable improvements yields, enantioselectivities relative...

Single and double junction solar cells with high open circuit voltage were fabricated using poly{thiophene-2,5-diyl-alt-[5,6-bis(dodecyloxy)benzo[c][1,2,5]thiadiazole]-4,7-diyl} (PBT-T1) blended fullerene derivatives in different weight ratios. The role of loading on structural morphological changes was investigated atomic force microscopy (AFM) X-ray diffraction (XRD). XRD AFM measurements showed that a higher mixing ratio led to breaking inter-chain packing hence resulted smaller...