Ping Chen

Anhui University, Luchow, Anhui Sheng, China

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Publications (32)163.47 Total impact

  • Hui Zhang · Miao Hong · Ping Chen · Anjian Xie · Yuhua Shen
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    ABSTRACT: In this paper, we synthesize 3D and ternary composite hydrogels containing reduced graphene oxide, multi-walled carbon nanotubes and Fe3O4 nanoparticles (rGO/MCNTs/Fe3O4) via hydrothermal process. The fibrous MCNTs are involved in 3D porous network rGO structure, and the 100-200 nm Fe3O4 nanoparticles are uniformly dispersed onto the rGO and MCNTs surface. The rGO/MWCNTs/Fe3O4 composite hydrogels exhibit excellent microwave absorbability. The composite with a coating layer thickness of only 2.0 mm exhibits a maximum absorption value of -36 dB at 13.44 GHz. And the composite hydrogel shows a bandwidth of 11.4 GHz (from frequency of 6.5–17.9 GHz) corresponding to the reflection loss at -10 dB (90% absorption) with a thickness range of 2.0-4.0 mm. Thus, the as-prepared rGO/MCNTs/Fe3O4 composite hydrogels serve as a new member of promising lightweight and high-performance EM wave absorbing materials. The great reason for their excellent microwave absorption properties is also ascribed to the better impedance match.
    No preview · Article · Jan 2016 · Journal of Alloys and Compounds
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    ABSTRACT: Chitosan/palladium {CTS/Pd}n composite multilayer film was assembled based on layer-by-layer self-assembly technique and in-situ photo-chemical reduction reaction, in which the CTS plays the role of a photo-reduction agent and an assembly reagent. Transmission electron microscopy (TEM) shows that spherical Pd nanoparticles with diameter of 20 nm are well-dispersed in the composite multilayer films, and the size of Pd nanoparticles increased gradually with the extension of illumination time. Besides, the {CTS/Pd}n composite multilayer film exhibits linear, uniform and regular layer-by-layer growth. Furthermore, the {CTS/Pd}n composite multilayer film presents an excellent catalytic properties for oxygen reduction, and it has potential application in energy, chemical synthesis and biological processes. Copyright
    No preview · Article · Oct 2015 · Surface and Interface Analysis
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    ABSTRACT: An N- and Fe-doped carbon nanotube/CMK3 nanocomposite (NFe-CNT/CMK3) was firstly prepared by a simple procedure. Trace Fe3+ can catalyze the in situ growth of the N- and Fe-doped carbon nanotube from melamine as a CNT precursor. The typical product shows excellent catalytic ability for the oxygen reduction reaction (ORR) in acidic media. The value of the onset potential and half-peak potential of the typical product is only 68.0 mV and 63.0 mV less than that of the commercial 20% Pt/C catalyst, respectively. The product also reveals superior stability and tolerance to methanol poisoning effects compared to Pt/C. We believe that the NFe-CNT and NFe-CMK3 in the nanocomposite have synergistically enhanced electrochemical activities for ORR in acidic media. The proposed method is simple and readily scalable. We anticipate such a nanoporous nanocomposite will have broad applications in other fields such as supercapacitors, lithium ion batteries, gas uptake, biosensors, removal of pollutants and so on.
    Full-text · Article · Aug 2015 · RSC Advances
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    ABSTRACT: Electrocatalysts for the oxygen reduction reaction (ORR) in acidic media are crucial in proton-exchange membrane (PEM) fuel cells and other electrochemical devices. Achieving ideal ORR activity and durability in acidic media remains a challenge. Here, we developed a new NFeCo-CNT/NC nanocomposite electrocatalyst from the highly available and recyclable plant biomass Typha orientalis using a readily scalable approach. The electrocatalyst exhibits excellent ORR activity, superior stability and tolerance to methanol poisoning effects in acidic media. The value of the onset potential and half-peak potential of the typical product is only 70 mV and 65 mV less than that of Pt/C, respectively. The NFeCo-CNT and NFeCo-NC in the nanocomposite have synergistically enhanced ORR activities. The catalyst may have practical applications in fuel cells. One of the important accomplishments of this work is the discovery that trace Fe3+ and Co2+ can synergistically catalyze the growth of the carbon nanotubes when melamine serves as the CNT precursor.
    No preview · Article · Aug 2015
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    ABSTRACT: We successfully synthesized the nitrogen-doped porous carbon particles (N-PCPs) by using a combined “black bread reaction” with thermal annealing in the presence of NH3 atmosphere. The method is very simple and practical for mass production, which will speed up as metal-free electrocatalyst commercialization. The resulting N-PCPs-800 shows decent catalytic activity, longer durability and better tolerance to methanol in alkaline and acidic media due to the high proportion of pyridinic nitrogen atoms and large BET surface area (up to 657.8 m2 g−1). This study can provide facile but efficient and versatile approaches to cost-effective and large-scale production of N-PCPs as metal-free oxygen reduction reaction electrocatalysts for fuel cells (FCs).
    No preview · Article · May 2015 · Electrochimica Acta
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    ABSTRACT: In this paper, BiOBr micromaterials with three-dimensional (3-D) microstructures were synthesised in a solvothermal system through modulation of surfactant polyethylene glycol or polyvinylpyrrolidone molecules. The transformation of the 3-D structures to two-dimensional (2-D) microplates along the reaction time was observed. The possible formation mechanism of the 3-D structures was discussed. The BiOBr micromaterials have shown excellent photocatalytical property toward bleaching of methyl blue under visible-light irradiation. The synthetic method would have potential applications in preparing other 3-D microstructures and 2-D microplates.
    No preview · Article · Jan 2015 · Journal of Experimental Nanoscience
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    ABSTRACT: We report a facile method to assemble a hierarchical and interconnected reduced graphene oxide/β-MnO2 (rGO/β-MnO2) nanobelt hybrid hydrogel by dispersion of presynthesized ultrathin β-MnO2 nanobelts (NBs) in graphene oxide (GO) precursor solution by a hydrothermal reaction. The microscopic structure of the three-dimensional (3D) hybrid hydrogel can be controlled by adjusting the content of the ultrathin β-MnO2 NBs, which exhibits the properties of low density, large specific surface area, and high compressive strength for the corresponding aerogel. Importantly, a typical hybrid hydrogel with 54.2% ultrathin β-MnO2 NBs displays a specific capacitance as high as 362 F g−1 at a current density of 1.0 A g−1, and even 282 F g−1 at 20 A g−1, which is three times higher than that of the pure rGO hydrogel (118 F g−1). Meanwhile, the typical hybrid hydrogel also shows outstanding cycling stability with 96.3% capacitance retention after 10000 cycles of cyclic voltammetry (CV) scans. These findings open up the use of ultrathin NBs for the self-assembly of hybrid hydrogels as high performance supercapacitor devices in energy storage and conversion.
    Preview · Article · Dec 2014
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    ABSTRACT: Developing the effective electrocatalyst for oxygen reduction reaction is a momentous issue in fuel cells. In this paper, we successfully synthesized the N-doped TiO2 Nanorods/Graphene (N-TiO2/NG) nanocomposite, which comprise the N-doped TiO2 (N-TiO2) nanorods (40-60 nm diameter and 90-300 nm length) and self-assembled nitrogen-doped graphene (NG) networks. We found that the nanocomposite exhibits greatly ORR electrocatalytic performance and also shows long durability and methanol tolerance than commercial 20 % Pt/C catalyst. This new nanocomposite may also have potential applications in other fields, which are related to energy storage, gas sensors, photocatalysis and so on.
    No preview · Article · Dec 2014 · ACS Applied Materials & Interfaces
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    ABSTRACT: Excellent CMK3/graphene-N-Co (CMK3/G-N-Co) catalytic system was firstly prepared by a simple procedure. It shows excellent catalytic ability in the alkaline media for oxygen reduction reaction (ORR) and the half-peak potential is only 27 mV less than that of the commercial 20 % Pt/C catalyst. The product revealed superior stability and tolerance to methanol poisoning effects compared to the commercial 20 % Pt/C catalyst. The excellent performance is probably attributed to the doping of the nitrogen and cobalt elements in the CMK3/G, formation of a three-dimension nanoporous network structure by combining graphene with CMK3 and the promoted charge transfer across the carbon-Co interface and conductivity of the nanocomposite. Since the graphene oxide (GO) and CMK3 have become the commercially available materials, the CMK3/G-N-Co catalytic system for ORR is the promising alternatives to Pt in fuel cells practical application. The product may also have potential applications in the fields of metal-air batteries, lithium-ion batteries, supercapacitors, sensors and so on.
    Preview · Article · Nov 2014
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    ABSTRACT: The CdS sensitized N-TiO2 (CdS-N-TiO2) inverse opals films were prepared by a sol-gel method integrated with successive ionic layer adsorption and reaction (SILAR). In order to harvest the visible sunlight and enhance the photocurrent, photosensitization of CdS (narrow-bandgap semiconductor) and nitrogen doping are used to couple with TiO2 inverse opals. The good visible light absorption ability and significant increase of photoresponse of CdS-N-TiO2 inverse opals films have been observed compared to TiO2 or N-TiO2 inverse opals films. A promising photocurrent density of 0.83 mA/cm2 has been achieved for the CdS-N-TiO2 inverse opal as photoanode at 1.23 mV versus reversible hydrogen electrode (RHE) bias under simulated solar-light illumination. Because the synergistic effect of CdS sensitization and N-doping with periodically ordered inverse opal nanostructures, the photocurrent density is enhanced in comparison to the pristine TiO2 inverse opals films.
    No preview · Article · Nov 2014 · Electrochimica Acta
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    ABSTRACT: Catalysts for oxygen reduction reaction (ORR) are crucial in fuel cells. Developing metal-free catalyst with high activity at low-cost and high-volume production remains a great challenge. Here, we report a kind of nitrogen-doped nanoporous carbon nanosheets derived from a conveniently available and accessible plant Typha orientalis. The materials have high surface area (the highest surface area can be 898 m2 g−1), a number of micropores and high content of nitrogen atom (highest content of 9.1 at.%). Typical product exhibits an unexpected, surprisingly high ORR activity. In alkaline media, it exhibits similar catalytic activity but superior tolerance to methanol to commercial 20% Pt/C. In acidic media, it also shows excellent catalytic ability, stability and tolerance to methanol. This low-cost, simple and readily scalable approach provides a straightforward route to synthesize excellent electrocatalyst directly from biomass, which may find broad applications in the fields of supercapacitors, sensors, gas uptake and so on.
    Preview · Article · Oct 2014 · Energy & Environmental Science
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    ABSTRACT: Catalysts for oxygen reduction reaction (ORR) play an important role in fuel cells. Developing the novel catalyst with high activity at low-cost remains a great challenge. We report the novel nanostructure (Co/Co3O4/C-N) of an interconnected nitrogen-doped carbon framework with Co/Co3O4 nanoparticles. Chitosan was used as carbon and nitrogen sources. The product, which has high BET surface area (320.5 m(2) g(-1)) shows excellent catalytic ability, stability and tolerance to methanol poisoning effects in the alkaline media for ORR. The product may also have potential applications in the fields of metal-air batteries, supercapacitors, lithium ion batteries, sensors, gas uptake, and so on.
    No preview · Article · Sep 2014 · Nano Energy
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    ABSTRACT: Large-scale one-step synthesis of novel teeth-like hierarchical architecture polyaniline (PANI)/lead tungstate (PbWO4) nanocomposites has been achieved from aqueous solution by in situ polymerization at room temperature. The reaction conditions, such as pH value and the molar ratio, are found to play a crucial role in controlling the size and morphology of the products. The model of “nucleation-growth-assembly” is proposed to explain formation mechanism of the teeth-like PANI/PbWO4 nanocomposites. Interestingly, the larger size and higher crystallinity are beneficial to the improvement of photoluminescence (PL) intensity. POLYM. COMPOS., 35:516–522, 2014. © 2013 Society of Plastics Engineers
    No preview · Article · Mar 2014 · Polymer Composites
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    ABSTRACT: Nitrogen-doped graphene aerogels-supported NiS2 nanoparticles (NiS2/NG) were synthesized by a one-pot hydrothermal method. In the process, l-cysteine was used not only as the nitrogen source to form the nitrogen-doped graphene aerogels, but also the sulfur source to form NiS2. The nitrogen-doped graphene (NG) hybrids show an interconnected reticulation of NG sheets with uniform deposition of NiS2 NPs, and the NiS2 NPs are deposited on the NG layers. In studying the effects of the NG and NiS2/NG for the ORR, we found that NiS2/NG shows a more positive onset potential, higher current density, and higher electron transfer number (∼4) for the oxygen-reduction reaction (ORR) in alkaline media than NG. Furthermore, NiS2/NG shows better durability and methanol tolerance than the commercial Pt/C catalyst.
    No preview · Article · Mar 2014 · Journal of Nanoparticle Research
  • Yuan · Wen-Jing · Ju-Chuan Li · Ping Chen · Yu-Hua Shen · An-Jian Xie

    No preview · Article · Feb 2014 · Journal of Nanoparticle Research
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    ABSTRACT: A novel inorganic/organic hybrid hydrogel system containing titanium dioxide (TiO2)/poly (ethylene glycol) double acrylates (PEGDA) was prepared by in situ photopolymerization on tumor cells for photodynamic therapy (PDT). TiO2 nanorods with diameter of ~5 nm and length of ~25 nm in this system presented dual functions, as effective photosensitizers for PDT and initiators for causing the in situ formation of hydrogel, under near-infrared (NIR) irradiation. The hybrid hydrogel retained the TiO2 around tumor cell to form a drug-loaded hydrogel shell. This resulted in a high concentration of singlet oxygen (1O2) under NIR irradiation, which induced apoptosis of tumor cell. Also, the hydrogel could reduce the side effects by preventing TiO2 from migrating to normal tissue. Furthermore, the TiO2 nanorods in this hydrogel shell were photochemically recyclable and could be reused in regular treatment. The outcomes of this study provide a new way to exploit multifunction of inorganic semiconductor nanomaterials for a variety of bio-medical applications.
    Full-text · Article · Nov 2013 · ACS Applied Materials & Interfaces
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    ABSTRACT: The Fe3O4@C core/shell microspheres were fabricated via a two-step process. Fe3O4 microspheres were firstly prepared, and Fe3O4@C core/shell microspheres were subsequently fabricated using glucose as a carbon source by a hydrothermal route, in which the thickness of the carbon coating was about 20 nm. The resulting products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR). The Nitrogen adsorption–desorption isotherms reveal their mesoporous structure and larger BET surface area (62.3 m2g-1). The Fe3O4@C core/shell microspheres possess ferromagnetism and high saturation magnetization (39.2 emu ⋅ g-1). Bovine hemoglobin (BHb) was used as a model protein to test the adsorption and desorption properties of the Fe3O4@C core/shell microspheres. The capacity for BHb adsorption was more than 71.3 mg/g. According to the values obtained in the MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assay the Fe3O4@C core/shell microspheres show a low toxicity. Therefore, the prepared Fe3O4@C core/shell microspheres are of great significance for guided site-specific drug delivery.
    No preview · Article · Jul 2013 · Nano brief reports and reviews
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    ABSTRACT: A new kind of nitrogen-doped graphene/carbon nanotube nanocomposite can be synthesized by a facile hydrothermal process under mild conditions, which exhibits synergistically enhanced electrochemical activity for the oxygen reduction reaction. This research provides a new route to access a metal-free electrocatalyst with a high activity under mild conditions.
    Full-text · Article · Jun 2013 · Advanced Materials
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    ABSTRACT: Nitrogen-doped graphene has been a recent research focus. It is crucial to further utilize the excellent properties of graphene macroscopic assemblies. Herein, we first report a unique and convenient hydrothermal process for controlled synthesis and structural adjustment of the nitrogen-doped graphene hydrogel (GN-GH), which can be readily scaled-up for mass production of nitrogen-doped graphene hydrogel by using organic amine and graphene oxide as precursors. The organic amine is not only as nitrogen sources to obtain the nitrogen-doped graphene but also as an important modification to control the assembly of graphene sheets in the 3D structures. Inner structure of the GN-GHs and the content of nitrogen in the graphene are easily adjusted by organic amine. Interestingly, it has been found that the supercapacitor performance of the typical product could be remarkably enhanced. Even at an ultrafast charge/discharge rate of 185.0 A/g, a high power density of 205.0 kW/kg can be obtained. In addition, at a current density of 100.0 A/g, 95.2% of its capacitance was retained for 4000 cycles. The present nitrogen-doped graphene hydrogels may have potential applications as ultrahigh power density capacitors in the vehicle, lift and the other devices at high rates.
    Full-text · Article · Mar 2013 · Nano Energy
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    ABSTRACT: Supercapacitors (also known as ultracapacitors) are considered to be the most promising approach to meet the pressing requirements of energy storage. Supercapacitive electrode materials, which are closely related to the high-efficiency storage of energy, have provoked more interest. Herein, we present a high-capacity supercapacitor material based on the nitrogen-doped porous carbon nanofibers synthesized by carbonization of macroscopic-scale carbonaceous nanofibers (CNFs) coated with polypyrrole (CNFs@polypyrrole) at an appropriate temperature. The composite nanofibers exhibit a reversible specific capacitance of 202.0 F g(-1) at the current density of 1.0 A g(-1) in 6.0 mol L(-1) aqueous KOH electrolyte, meanwhile maintaining a high-class capacitance retention capability and a maximum power density of 89.57 kW kg(-1). This kind of nitrogen-doped carbon nanofiber represents an alternative promising candidate for an efficient electrode material for supercapacitors.
    Full-text · Article · Jul 2012 · ACS Nano

Publication Stats

925 Citations
163.47 Total Impact Points

Institutions

  • 2013-2016
    • Anhui University
      • School of Chemistry and Chemical Engineering
      Luchow, Anhui Sheng, China
  • 2011-2013
    • University of Science and Technology of China
      • Department of Chemistry
      Luchow, Anhui Sheng, China
    • Chizhou University
      Kuei-ch’ih, Anhui Sheng, China
  • 2007-2010
    • Tongji University
      • Department of Chemistry
      Shanghai, Shanghai Shi, China