Jilin City Institute of Testing on Product Quality

Jilin, China

Jilin City Institute of Testing on Product Quality

Jilin, China
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Li N.,Zhejiang Normal University | Li Z.,Zhejiang Normal University | Yuan J.,Zhejiang Normal University | Hu J.,Zhejiang Normal University | And 5 more authors.
Electrochimica Acta | Year: 2012

NiHCFs nanoparticles are deposited onto the surface of multiwalled carbon nanotubes (MWCNTs) with a grafted poly(4-vinylpyridine). The as-prepared NiHCF/PV4P-g-MWCNTs composites are characterized by transition electron microscope (TEM) and Fourier transform infrared spectroscopy (FTIR), which confirms the presence of NiHCFs nanoparticles, and shows that NiHCFs nanoparticles are highly dispersed on the surface of MWCNTs in high density. Cyclic voltammograms (CVs) exhibit a great enhancement for NiHCFs/PV4P-g-MWCNTs composites in capacity and stability as ion exchanger by comparison with bulk NiHCF. The capacity for the electrodes modified with NiHCFs/PV4P-g-MWCNTs composites is 69.24 mC/cm -2 mg, after 100 cycles potential sweeping, these composites modified electrode retains its 98.5% ion-exchange capacity. These composites also exhibit a higher selectivity of for Cs + over Na + ions in high concentration of Na + ion, which is confirmed by X-ray photoelectron spectroscopy (XPS). © 2012 Elsevier Ltd.

Li N.,Zhejiang Normal University | He B.,Zhejiang Normal University | Xu S.,Zhejiang Normal University | Yuan J.,Zhejiang Normal University | And 3 more authors.
Materials Chemistry and Physics | Year: 2012

Poly(4-vinylpyridine) (P4VB) was grafted to multiwalled carbon nanotubes (MWCNTs) by an in situ polymerization. This grafted polymer plays two roles in the synthesis of Prussian Blue (PB)/MWCNT composites: (1) a stabilizer to protect PB nanoparticles from aggregation; (2) a linker to anchor these nanoparticles on the surface of MWCNTs. The size of PB nanoparticles deposited on MWCNTs can be controlled by in site layer-by-layer coordination of Fe 3+ and [Fe(CN) 6] 4- ions in aqueous solution. The as-prepared PB/P4VP-g-MWCNT composites were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and X-ray powder diffraction, which revealed that these PB nanoparticles were uniformly distributed on the surface of MWCNTs, and grew upon layer-by-layer assembly. A potential use of PB/P4VP-g-MWCNT composites was demonstrated as an electrocatalyst used in the electrochemical detection of l-cysteine. The as-prepared electrodes modified with PB/P4VP-g-MWCNT composites showed two reversible redox waves assigned to a fast surface-controlled processes. The analytical performance for l-cysteine detection is associated with the load of PB nanoparticles onto MWCNTs. In an optimal experiment, for these as-prepared electrodes, their detection limit of l-cysteine can be measured as low as 0.01 μM with a sensitivity 778.34 nA μM -1 cm -2. © 2012 Elsevier B.V. All rights reserved.

Hu J.,Zhejiang Normal University | He B.,Zhejiang Normal University | Lu J.,Zhejiang Normal University | Hong L.,Zhejiang Normal University | And 4 more authors.
International Journal of Electrochemical Science | Year: 2012

In this article, a facile synthesis of Pt/polyallylamine/reduced graphene oxide (Pt/PAA/RGO) composites is put forward by usingPAA as a linker and stabilizer, which is characterized by ultraviolet visible absorption, fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray Photoelectron Spectroscopy and transmission electron microscopy. In the presence of PAA, Pt nanoparticles with an average diameter of 1.4 nm are uniformly dispersed on RGO. In contrast, as to Pt/RGO prepared without PAA, Pt nanoparticles averaged 4 nm are unevenly deposited and aggregated on RGO. Pt/PAA/RGO composites exhibit a higher conversion efficiency of methanol and a faster oxidation removal of adsorbed CO during the electrochemical catalysis process due to their greater electroactive surface area. The molecular pathway of methanol oxidation at the surface of Pt catalysts is revealed in the impedance measurements. The impedance response of Pt/PAA/RGO catalysts shows a capacitive, resistive, pseudoinductive or inductive behavior depending on the applied potential. © 2012 by ESG.

Yuan J.,Zhejiang Normal University | Jin X.,Zhejiang Normal University | Li N.,Zhejiang Normal University | Chen J.,Zhejiang Normal University | And 4 more authors.
Electrochimica Acta | Year: 2011

Multiwalled carbon nanotubes (MWCNTs) were grafted with poly(4-vinylpyridine) (PV4P) in aqueous solution by in situ free radical polymerization of 4-vinylpyridine. The as-prepared PV4P-g-MWCNTs hybrids can load phosphotungstic acid (PW) on a large scale by electrostatic interaction, which was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The as-prepared PWs/PV4P-g-MWCNTs hybrids were modified onto a carbon glassy electrode. Cyclic voltammograms (CVs) show that the electrochemical behavior of the modified electrode follows a four-one-electron surface-confined process of Keggin-type PWs. The modified electrode can be used as a nitrite sensor. The comparison of CVs shows that the response current of nitrite reduction at the electrode modified with PWs/PV4P-g-MWCNTs hybrids is 15 times higher than that of PWs/MWCNTs hybrids in a control experiment at 0.65 V (vs. AgCl). The amperometric i-t curve for the electrode modified with PWs/PV4P-g-MWCNTs hybrids exhibits a linear concentration of NO2- ranged from 1.2 to 17.5 μM with a detection limit of 0.2 μM. © 2011 Elsevier Ltd. All Rights Reserved.

Bao Y.,University of Chinese Academy of Sciences | Song J.,University of Chinese Academy of Sciences | Song J.,Jilin City Institute of Testing on Product Quality | Mao Y.,University of Chinese Academy of Sciences | And 4 more authors.
Electroanalysis | Year: 2011

Graphene oxide-templated polyaniline (GO-PAN) microsheets were prepared via oxidation polymerization of aniline with graphene oxide (GO) as template. By applying this approach, irregularly shaped GO-PAN microsheets were obtained which was revealed by scanning electron microscopy (SEM). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) measurements demonstrated that the resulted GO-PAN was electroactive and could be further used as electrocatalyst in simultaneous determination of ascorbic acid (AA), dopamine (DA) and together with uric acid (UA). © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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