In this study, a novel nanocomposite multilayers was deposited on the electrospun nanofibrous mats by an electrostatic layer-by-layer (LBL) self-assembly technique. The positively charged water-insoluble 2,9,16,23-tetraaminophthalocyanine copper (CuTaPc) and the negatively charged water-soluble poly(acrylic acid) (PAA) were alternately deposited on the surface of negatively charged nanofibrous cellulose mats. The cationic CuTaPc was synthesized and characterized by UV–Vis and Fourier transform infrared (FT-IR) spectroscopy. The template nanofibrous cellulose mats were obtained from the alkaline hydrolysis of electrospun nanofibrous cellulose acetate mats. The resultant nanofibrous mats were characterized by scanning electron microscopy (SEM) and FT-IR spectroscopy. The SEM images showed that the composite LBL structured films were homogeneously deposited on the surface of the nanofibers . The diameters of nanofibers increased with the number of deposition bilayers . The average thickness of each CuTaPc/PAA bilayer is about 10 nm. Additionally, the FT-IR spectra results also indicated that the CuTaPc and PAA were coated on the nanofibrous cellulose mats.
In this study, a novel electrochemical sensor was designed to detect luteolin (Lu) with the composite of gold nanoparticles and nickel phthalocyanine-based 2D conductive metal-organic frameworks (Au NPs@NiPc-Cu MOFs) for the first time. The NiPc-Cu MOFs exhibit excellent conductivity, large specific surface area, and porous structure, which can accelerate the mass transfer process of target molecules. To further improve the sensitivity of the sensing platform, Au NPs with outstanding conductivity were introduced to the surface of NiPc-Cu MOFs to prepare Au NPs@NiPc-Cu MOFs. The synergistic effect of NiPc-Cu MOFs and Au NPs endows the sensor with excellent electrocatalytic performance and outstanding sensitivity. Under optimal conditions, the electrochemical sensor has a wide linear range (0.1–40 μM). Moreover, the prepared sensor possesses good stability and anti-interference ability. This method does not require complicated sample pretreatment, simple operation, and short detection time, which can provide a new method for the rapid detection of Lu.
Wenting Chen,Shaoyi Li,Xue Lu,Jian Yang,Shaobo Cao,Kang Da,Ximei Fan
Graphical Hyperbranched phthalocyanine copper (HCuPc) wrapping nano-silica is synthesized via in situ polymerization and served as precursor for preparing atomically dispersed Cu−N−C electrocatalysts. Highly dispersed copper single-atom catalyst Cu-N−C has good electrocatalytic performance by using chemical anchoring of phthalocyanine and steric hindrance to restrict the migration and aggregation of Cu atoms. Atomically dispersed nonprecious metal-based catalysts have been considered as the most promising alternatives to Pt-based catalysts since their excellent catalytic activities and almost 100 % atom utilization in oxygen reduction reaction. However, the agglomeration of metal atoms is unavoidable during pyrolysis process, thus leads to the decrease of electrocatalytic performance. Herein, hyperbranched phthalocyanine copper (HCuPc) wrapping nano-silica is synthesized via in situ polymerization and served as precursor for preparing atomically dispersed Cu−N−C electrocatalysts. Owing to the confinement effect of chemical-anchoring and spatial-hindrance, the migration and agglomeration of Cu atoms are restricted in carbonization process. The aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and X-ray photoelectron spectroscopy (XPS) are performed to confirm the atomically dispersed of as-synthesized catalyst, which is labelled as HCu−N−C/SiO 2 . In addition, the HCu−N−C/SiO 2 possess superior ORR electrocatalytic activities with a half-wave potential of 0.874 V vs RHE and a limiting current density of 5.7 mA cm −2 . The zinc-air batteries assembled with HCu−N−C/SiO 2 catalyst exhibit a high specific capacity of 789 mAh g −1 as well as a maximum discharge power density of 176 mW cm −2 . This work proves that hyperbranched phthalocyanine structure could be a useful confined framework to the fabrication of singles-atom catalysts.
Rong Li,Jiale Ding,Xijiao Mu,Yifei Kang,Anran Wang,Weihui Bi,Yunhe Zhang,Jing Cao,Qingfeng Dong
The extreme instability of pure α-phase FAPbI 3 under high humidity conditions restricts the high-throughput fabrication in unmodified air environments, resulting in poor performance of α-phase FAPbI 3 perovskite devices obtained by scalable fabrication methods. Here we synthesized hyperbranched copper phthalocyanine (HCuPc) as a supramolecular additive with twisted phthalocyanine units to realize the molecular-level encapsulation at the grain boundaries through supramolecular interaction, which greatly broadened the processing window of FAPbI 3 under high humidity. At the same time, unlike traditional encapsulation layer that carrier can only be collected by tunneling effect, the twisted phthalocyanine ring of HCuPc in perovskite films is more conducive to hole extraction. Finally, a record efficiency was achieved in pure FAPbI 3 based inverted structured solar cell by blade-coating to the best of our knowledge, even under unmodified humid air conditions (relative humidity of 65%–85%). The best operational stability of 3D pure FAPbI 3 devices can also be achieved at the same time and unencapsulated HCuPc-FAPbI 3 device can even operate with negligible degradation for 100 h in the open air (RH 30%–40%).
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