Electrochemical Determination of Hydrogen Peroxide Based on the Synergistic Effect of Nitrogen-Doped Porous Carbon/Carbon Nanohybrid Aerogel

In this paper, a new hydrogen peroxide electrochemical sensor based on the synergistic modification of nitrogen-doped porous carbon (NPC) and carbon nanohybrid aerogel (CNA) is proposed. NPC has been successfully synthesized from porous polyacrylonitrile (PAN) precursor by pre-oxidation to obtain adequate pyridinic-N, which contributes to enhance the electrocatalytic activity. Simultaneously, CNA has been also prepared by self-assembly in a hydrothermal environment without any interference followed by vacuum freeze drying. The final products were characterized by diversiform techniques including scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD). The results showed that the NPC with 23.18% pyridinic-N exhibited well-defined and interconnected three-dimensional (3D) porous microstructure and CNA which encapsulates [Formula: see text]-Fe2O3 particles was obtained. The sensor fabricated by NPC and CNA delivered a wide linear range from 60[Formula: see text][Formula: see text]M to 1680[Formula: see text][Formula: see text]M ([Formula: see text]) and 1680[Formula: see text][Formula: see text]M to 3335[Formula: see text][Formula: see text]M ([Formula: see text]) with sensitivities of 3.98[Formula: see text][Formula: see text]A mM[Formula: see text] and 5.56[Formula: see text][Formula: see text]A mM[Formula: see text], respectively. Furthermore, the obtained sensor showed low detection limit (4.478[Formula: see text][Formula: see text]M, [Formula: see text]/[Formula: see text]), good selectivity and repeatability, rapid response and satisfying practicability.

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Fabrication and Electrochemical Performance of Nitrogen-Doped Graphene Synthesized by Hydrothermal Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.804.35 ◽

2014 ◽

Vol 804 ◽

pp. 35-38

Author(s):

Sen Liang ◽

Min Luo ◽

Yuan Yun Dou ◽

Lei Guo ◽

Bin Liang ◽

...

Keyword(s):

Graphene Oxide ◽

Photoelectron Spectroscopy ◽

Electrical Measurements ◽

X Ray ◽

Nitrogen Doped ◽

Reduced Graphene ◽

Nitrogen Doped Graphene ◽

Doped Graphene ◽

Nitrogen Substitution ◽

Pyridinic N

In this study, nitrogen doped graphene (NG) was prepared by using hydrothermal treatment of graphene oxide (GO) and ethylene diamine (EDA). The surface chemistry of the reduced graphene oxide (rGO) and the NG was investigated by the X-ray photoelectron spectroscopy (XPS). The results revealed that there were four kinds of nitrogen substitution: pyrollic N, pyridinic N, graphitic N and C-NH2. Further, the electrical measurements illustrated that the NG had superior capacitive performance than that of the rGO. Specifically, the maximum specific capacitance of NG was 200.6 F/g due to the double-layer capacitive and pseudocapacitive effect from the nitrogen-doped graphene. In addition, the present studies showed that the EDA was not only choose as nitrogen doping source but also played a key role in reduction.

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Enhanced removal of Cd (II) from aqueous solution by EDTA functionalized three-dimensional magnetic nitrogen-doped porous carbon

Environmental Science and Pollution Research ◽

10.1007/s11356-021-13028-z ◽

2021 ◽

Author(s):

Ting Zhang ◽

Changyu Li ◽

Weijie Shi ◽

Yifan Zhu ◽

Yan Chen ◽

...

Keyword(s):

Aqueous Solution ◽

Porous Carbon ◽

Three Dimensional ◽

Nitrogen Doped

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Improvement of the thermal stability of dendritic silver-coated copper microparticles by surface modification based on molecular self-assembly

Nano Convergence ◽

10.1186/s40580-021-00265-8 ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Tae Hyeong Kim ◽

Hyeji Kim ◽

Hyo Jun Jang ◽

Nara Lee ◽

Kwang Hyun Nam ◽

...

Keyword(s):

Thermal Stability ◽

Photoelectron Spectroscopy ◽

Self Assembly ◽

Electrically Conductive ◽

X Ray ◽

Alkyl Chains ◽

Conductive Film ◽

Initial Resistance ◽

Thermal Stability Of ◽

Scanning Electron

AbstractIn the study reported herein, silver-coated copper (Ag/Cu) powder was modified with alkanethiols featuring alkyl chains of different lengths, namely butyl, octyl, and dodecyl, to improve its thermal stability. The modification of the Ag/Cu powders with adsorbed alkanethiols was confirmed by scanning electron microscopy with energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. Each powder was combined with an epoxy resin to prepare an electrically conductive film. The results confirmed that the thermal stability of the films containing alkanethiol-modified Ag/Cu powders is superior to that of the film containing untreated Ag/Cu powder. The longer the alkyl group in the alkanethiol-modified Ag/Cu powder, the higher the initial resistance of the corresponding electrically conductive film and the lower the increase in resistance induced by heat treatment.

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Synthesis of Three-Dimensional Fe3O4/Graphene Aerogels for the Removal of Arsenic Ions from Water

Journal of Nanomaterials ◽

10.1155/2015/864864 ◽

2015 ◽

Vol 2015 ◽

pp. 1-6 ◽

Cited By ~ 10

Author(s):

Yan Ye ◽

Da Yin ◽

Bin Wang ◽

Qingwen Zhang

Keyword(s):

Electron Microscopy ◽

Photoelectron Spectroscopy ◽

3D Structure ◽

Three Dimensional ◽

X Ray Diffraction ◽

X Ray ◽

Graphene Aerogels ◽

Transmission Electron ◽

Potential Applications ◽

Removal Of Arsenic

We report the synthesis of three-dimensional Fe3O4/graphene aerogels (GAs) and their application for the removal of arsenic (As) ions from water. The morphology and properties of Fe3O4/GAs have been characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and superconducting quantum inference device. The 3D nanostructure shows that iron oxide nanoparticles are decorated on graphene with an interconnected network structure. It is found that Fe3O4/GAs own a capacity of As(V) ions adsorption up to 40.048 mg/g due to their remarkable 3D structure and existence of magnetic Fe3O4nanoparticles for separation. The adsorption isotherm matches well with the Langmuir model and kinetic analysis suggests that the adsorption process is pseudo-second-ordered. In addition to the excellent adsorption capability, Fe3O4/GAs can be easily and effectively separated from water, indicating potential applications in water treatment.

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Nano-PAA-CuCl2 Composite as Fenton-Like Reusable Catalyst to Enhanced Degrade Organic Pollutant MB/MO

Catalysts ◽

10.3390/catal11010010 ◽

2020 ◽

Vol 11 (1) ◽

pp. 10

Author(s):

Yang Dang ◽

Yu Cheng ◽

Yukun Zhou ◽

Yifei Huang ◽

Kaige Wang

Keyword(s):

Photoelectron Spectroscopy ◽

Self Assembly ◽

Organic Pollutant ◽

Energy Dispersive Spectrometer ◽

Chemical Properties ◽

Anodic Alumina ◽

Alumina Substrate ◽

Reusable Catalyst ◽

X Ray ◽

Nanoporous Anodic Alumina

The treatment of organic dye contaminants in wastewaters has now becoming more imperative. Fenton-like degradation of methylene blue (MB) and methyl orange (MO) in aqueous solution was investigated by using a nanostructure that a layer of CuCl2 nanoflake film grown on the top surface of nanoporus anodic alumina substrate (nano-PAA-CuCl2) as catalyst. The new nano-PAA-CuCl2 composite was fabricated with self-assembly approach, that is, a network porous structure film composed of CuCl2 nanoflake grown on the upper surface of nanoporous anodic alumina substrate, and the physical and chemical properties are characterized systematically with the X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and high-resolution transmission electron microscopy (HRTEM), Energy Dispersive Spectrometer (EDS), X-ray photoelectron spectroscopy (XPS). The experimental results showed that the nano-PAA-CuCl2 catalyst presented excellent properties for the degradation of two typical organic pollutants such as MB and MO, which were almost completely degraded with 8 × 10−4mol/L nano-PAA-CuCl2 catalyst after 46 min and 60 min at reaction conditions of H2O2 18 mM and 23 mM, respectively. The effects of different reaction parameters such as initial pH, H2O2 concentration, catalyst morphology and temperature were attentively studied. And more, the stability and reusability of nano-PAA-CuCl2 were examined. Finally, the mechanism of MB and MO degradation by the nano-PAA-CuCl2/H2O2 system was proposed, based on the experimental data of the BCA and the temperature-programmed reduction (H2-TPR) and theoretical analysis, the reaction kinetics belonged to the pseudo-first-order equation. This new nanoporous composite material and preparation technology, as well as its application in Fenton-like reaction, provide an effective alternative method with practical application significance for wastewater treatment.

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A Two-step Electrodeposition of Pd-Cu/Cu2O Nanocomposite on FTO Substrate for Non-enzymatic Hydrogen Peroxide Sensor

Current Analytical Chemistry ◽

10.2174/1573411017666210520153409 ◽

2021 ◽

Vol 17 ◽

Author(s):

Ke Huan ◽

Li Tang ◽

Dongmei Deng ◽

Huan Wang ◽

Xiaojing Si ◽

...

Keyword(s):

Hydrogen Peroxide ◽

Cyclic Voltammetry ◽

Photoelectron Spectroscopy ◽

Chemical Structure ◽

Pd Nanoparticles ◽

Optimal Conditions ◽

Potential Oscillation ◽

X Ray Diffraction ◽

X Ray

Background: Hydrogen peroxide (H2O2) is a common reagent in the production and living, but excessive H2O2 may enhance the danger to the human body. Consequently, it is very important to develop economical, fast and accurate techniques for detecting H2O2. Methods: A simple two-step electrodeposition process was applied to synthesize Pd-Cu/Cu2O nanocomposite for non-enzymatic H2O2 sensor. Cu/Cu2O nanomaterial was firstly electrodeposited on FTO by potential oscillation technique, and then Pd nanoparticles were electrodeposited on Cu/Cu2O nanomaterial by cyclic voltammetry. The chemical structure, component, and morphology of the synthesized Pd-Cu/Cu2O nanocomposite were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical properties of Pd-Cu/Cu2O nanocomposite were studied by cyclic voltammetry and amperometry. Results: Under optimal conditions, the as-fabricated sensor displayed a broad linear range (5-4000 µM) and low detection limit (1.8 µM) for the determination of H2O2. The proposed sensor showed good selectivity and reproducibility. Meanwhile, the proposed sensor has been successfully applied to detect H2O2 in milk. Conclusion: The Pd-Cu/Cu2O/FTO biosensor exhibits excellent electrochemical activity for H2O2 reduction, which has great potential application in the field of food safety.

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Three-Dimensional Holey-Graphene Architectures for Highly Sensitive Enzymatic Electrochemical Determination of Hydrogen Peroxide

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2019.16613 ◽

2019 ◽

Vol 19 (11) ◽

pp. 7404-7409 ◽

Cited By ~ 4

Author(s):

Aihua Jing ◽

Gaofeng Liang ◽

Hao Shi ◽

Yixin Yuan ◽

Quanxing Zhan ◽

...

Keyword(s):

Electron Microscopy ◽

Hydrogen Peroxide ◽

Graphene Oxide ◽

Three Dimensional ◽

Electrochemical Determination ◽

High Specific Surface Area ◽

3D Graphene ◽

Practical Applications ◽

Transmission Electron ◽

Mild Defect

Three-dimensional (3D) graphene with high specific surface area, excellent conductivity and designed porosity is essential for many practical applications. Herein, holey graphene oxide with nano pores was facilely prepared via a convenient mild defect-etching reaction and then fabricated to 3D nanostructures via a reduction method. Based on the 3D architectures, a novel enzymatic hydrogen peroxide sensor was successfully fabricated. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used to characterize the 3D holey graphene oxide architectures (3DHGO). Cyclic voltammetry (CV) was used to evaluate the electrochemical performance of 3DHGO at glassy carbon electrode (GCE). Excellent electrocatalytic activity to the reduction of H2O2 was observed, and a linear range of 5.0×10-8~5.0×10-5 M with a detection limit of 3.8×10-9 M was obtained. These results indicated that 3DHGO have potential as electrochemical biosensors.

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One-step chemical vapor deposition synthesis and supercapacitor performance of nitrogen-doped porous carbon–carbon nanotube hybrids

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.8.267 ◽

2017 ◽

Vol 8 ◽

pp. 2669-2679 ◽

Cited By ~ 14

Author(s):

Egor V Lobiak ◽

Lyubov G Bulusheva ◽

Ekaterina O Fedorovskaya ◽

Yury V Shubin ◽

Pavel E Plyusnin ◽

...

Keyword(s):

Chemical Vapor Deposition ◽

Hybrid Materials ◽

Vapor Deposition ◽

Porous Carbon ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Chemical Vapor ◽

Carbon Surface ◽

Simultaneous Formation ◽

Nitrogen Doped

Novel nitrogen-doped carbon hybrid materials consisting of multiwalled nanotubes and porous graphitic layers have been produced by chemical vapor deposition over magnesium-oxide-supported metal catalysts. CN x nanotubes were grown on Co/Mo, Ni/Mo, or Fe/Mo alloy nanoparticles, and MgO grains served as a template for the porous carbon. The simultaneous formation of morphologically different carbon structures was due to the slow activation of catalysts for the nanotube growth in a carbon-containing gas environment. An analysis of the obtained products by means of transmission electron microscopy, thermogravimetry and X-ray photoelectron spectroscopy methods revealed that the catalyst's composition influences the nanotube/porous carbon ratio and concentration of incorporated nitrogen. The hybrid materials were tested as electrodes in a 1M H2SO4 electrolyte and the best performance was found for a nitrogen-enriched material produced using the Fe/Mo catalyst. From the electrochemical impedance spectroscopy data, it was concluded that the nitrogen doping reduces the resistance at the carbon surface/electrolyte interface and the nanotubes permeating the porous carbon provide fast charge transport in the cell.

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