Search

Here, we successfully developed nanostructured PtNi particles supported on nitrogen-doped carbon (NC), which were obtained by carbonization of metal-organic frameworks under different temperatures, forming the nano-PtNi/NC-600, nano-PtNi/NC-800, nano-PtNi/NC-900 and nano-PtNi/NC-1000 catalysts. For hydrosilylation of 1-octene, we found that the nano-PtNi/NC-1000 catalyst exhibits higher activity for anti-Markovnikov hydrosilylation of 1-octene than those of nano-PtNi/NC-600, nano-PtNi/NC-800, nano-PtNi/NC-900 catalysts. Experiments have verified that benefiting from obvious charge transfer from nano-PtNi particles to NC support carbonized at 1,000 °C, the nano-PtNi/NC-1000 catalyst achieved almost complete conversion and produce exclusive adduct for anti-Markovnikov hydrosilylation of 1-octene. Importantly, the nano-PtNi/NC-1000 catalyst exhibited good reusability for the hydrosilylation reaction. This work provides a new path to optimize electronic structure of catalysts by support modification to enhance electron transfer between metal active species and supports for highly catalytic performance.

Fenton-like catalysis has found a broad application for the removal of drug compounds from wastewater. Herein, we presented a synthesis method for the novel coordinatively unsaturated cobalt-iron bimetallic based metal-organic frameworks as heterogeneous catalysts for Fenton-like catalysis in amoxicillin (AMX) degradation process under the presence of H2O2. In order to optimize the process, the influences of catalyst dosages, H2O2 concentrations, initial pH, and the coexisting anions on AMX degradation were studied. Results showed that the complete AMX degradation was found at pH: 7, H2O2: 3 mM, catalyst dose: 0.1 g/L. After five cycle times, coordinatively unsaturated cobalt-iron bimetallic based metal-organic frameworks can still perform substantial Fenton-catalytic activity (100.0 % within 30 min). This project highlights the synthesized catalyst with outstanding performances for Fenton catalytic degradation of drug compounds. The cobalt-iron based organic frameworks with coordinated sites indicated significant antibacterial performance in the disc diffusion analysis.

The hydrosilylation reaction is one of the largest-scale application of homogeneous catalysis and is widely used to enable the commercial manufacture of silicon products. However, considerable issues including disposable platinum consumption, undesired side reactions and unacceptable catalyst residues still remain. Here, we synthesize a heterogeneous partially charged single-atom platinum supported on anatase TiO2 (Pt1δ+/TiO2) catalyst via an electrostatic-induction ion exchange and two-dimensional confinement strategy, which can catalyze hydrosilylation reaction with almost complete conversion and produce exclusive adduct. Density functional theory calculations reveal that unexpected property of Pt1δ+/TiO2 originates from atomic dispersion of active species and unique partially positive charge Ptδ+ electronic structure that conventional nanocatalysts do not possess. The fabrication of single-atom Pt1δ+/TiO2 catalyst accomplishes a reasonable use of Pt through recycling and maximum atom-utilized efficienc...

In this work, we prepared a reduced graphene oxide (RGO)/poly(3,4-ethylenedioxythiophene) (PEDOT) hybrid composite with well defined nanostructure. The graphene oxide (GO) was first deposited on substrate through the Langmuir–Blodgett (LB) deposition, which provided a tunable and ordered GO arrangement on substrate. Then the GO LB films were reduced to RGO by following thermal treatment, and a ultrathin conducting polymer (CP) PEDOT was directly coated on RGO through a vapor phase polymerization process. The RGO/PEDOT nanocomposite exhibits excellent electrical conductivity about 377.2 S/cm. Electrochemical activity investigation revealed that this nanocomposite exhibits 213 F/g high specific capacitance at a 0.5 A/g current density and shows better capacitance retention rate than pure PEDOT. The detailed study also confirmed that the arrangement of RGO shows distinct influence on the electrical and electrochemical properties of obtained nanocomposite. Large area RGO/PEDOT nanocomposite with high conductivity and electrochemical activity can be deposited on different substrates. Such high conductivity and electrochemical activity RGO/CP nanocomposite shows promising application future in organic and flexible electrode materials for sustainable energy storage.

In this work, conducting polymers poly(3,4-ethylenedioxythiophene) (PEDOT), PEDOT/carbon nanotubes (CNTs), and PEDOT/reduced graphene oxide (RGO) were prepared via an in situ chemical vapor phase polymerization (VPP) process. Experiment results showed that PEDOT and PEDOT nanocomposites were uniformly constructed in oxidant and oxidant nanocomposite films through a modifying template effect. The VPP PEDOT and its nanocomposites were built on aluminium film as supercapaitor electrode materials and electrochemical capacitive properties were investigated by using cycle voltammetry and charge/discharge techniques. The VPP PEDOT exhibited a specific capacitance of 92 F/g at a current density of 0.2 A/g. The VPP PEDOT composites consisting of CNTs and RGO displayed specific capacitances of 137 and 156 F/g, respectively, at the same current density. For VPP nanocomposites, more than 80 % of initial capacitance was retained after 1,000 charge/discharge cycles, suggesting a good cycling stability for electrochemical electrode materials. The good capacitive performance of the conducting polymer nanocomposites are contributed to the synergic effect of the two components.

Layer-ordered and ultrathin films of conducting polymer poly(3,4-ethylene dioxythiophene) (PEDOT) was prepared through a chemical vapor phase polymerization method. The chemical polymerization of 3, 4-ethylenedioxythiophene monomer was initiated in as-prepared oxidant LB films,and PEDOT nanofilms with layer-ordered structure was constructed. UV-Vis absorption spectrum and Fourier transform infrared spectroscopy was used to confirm an interface polymerization of PEDOT in as-prepared LB films. The results of X-ray diffraction and secondary ion mass spectrometry revealed that conductive PEDOT ultrathin layers were well located at different planes of LB films. The film deposition surface pressure and chemical polymerization time of PEDOT monomer in as-prepared LB films showed distinct influence on surface morphology and conductive performance of the polymerized PEDOT LB films. This layer-ordered conducting polymer ultrathin films was deposited on ITO surface as hole injection layer for organic light-emitting diodes, and the luminescence performance of devices was improved as well.

We report the use of zinc phthalocyanine (ZnPc) thin films as an optical gas sensor. The ZnPc thin films were fabricated by Langmuir-Blodgett technique onto quartz substrates. The responses of the thin films to various volatile organic compounds (VOCs) were recorded by using optical absorption spectroscopy under static conditions. It was found that the thin films presented a reversible changes in the absorption spectra after exposure to the test gas. The strongest gas-sensing response was observed when the films were exposed to pyridine. The experimental results indicate that the phthalocyanine can easily react with the VOCs which include electron donating group or electron withdrawing group. And the responses are in good agreement with the intensity of electron donating or electron withdrawing ability.