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Li Z.,Jiangsu University | Li Z.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Wu L.,Jiangsu University | Wang L.,Jiangsu University | And 3 more authors.
Electrochimica Acta | Year: 2017

Nickel cobalt sulfide (NiCo2S4) nanosheets were successfully grown on porous graphitic carbon nitride (g-C3N4) nanosheets (NiCo2S4 NSs/P-g-C3N4), which was employed as supercapacitor electrode materials. The NiCo2S4 NSs/P-g-C3N4 electrode shows specific capacity as high as 506 C g−1 at a current density of 1 A g−1, outstanding rate capability and cycling stability (almost no attenuation after 1500 cycles at 3 A g−1), which can be attributed to the unique ‘sheets on sheets’ architectures providing short ion diffusion pathways, and good ion permeability. NiCo2S4 NSs/P-g-C3N4 was combined with activated carbon (AC) to construct NiCo2S4 NSs/P-g-C3N4//AC asymmetric supercapacitor (ASC), which offers a specific energy of 16.7 W h kg−1 at a specific power of 200 W kg−1, and high cycling performance (about 99% retention after 5000 continuous cycles). An ASC device could power a mini-fan for about 60 s, demonstrating that NiCo2S4 NSs/P-g-C3N4 is a potential electrode material for energy storage. © 2017 Elsevier Ltd


Li Z.C.,Jiangsu Teachers University of Technology | Li Z.C.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Guan M.Y.,Jiangsu Teachers University of Technology | Guan M.Y.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | And 4 more authors.
Micro and Nano Letters | Year: 2012

Flowerlike α-FeOOH products were successfully prepared through hydrothermal treatment of ammonium iron (II) sulphate solution without extra template or surfactant. The as-prepared products were characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy and Fourier transform infrared spectroscopy. It was found that the reaction temperature and time were critical for the formation of flowerlike α-FeOOH products. The results revealed that the flowerlike α-FeOOH was single-crystal structure in nature. Furthermore, the electrochemical properties of flowerlike α-FeOOH were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements. A pair of electrochemical redox peaks presenting on each cyclic voltammogram indicated the existence of Faradic process, which was a signature of pseudocapacitance. The shape of charge-discharge curve displayed typical characteristics of Faradic deposition. Flowerlike α-FeOOH showed a good electrochemical performance, which may be a promising candidate as electrode material for supercapacitors. © 2012 The Institution of Engineering and Technology.


Li Z.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Li Z.,Jiangsu Teachers University of Technology | Liu Y.,Jiangsu Teachers University of Technology | Shang T.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2011

Gold nanoparticles were prepared in PEG10000/Vc/HAuCl4 system with Vc as the reducing agent. Then gold-platinum bimetallic nanoparticles with different Pt/Au ratio were formed using a simple gold seed-mediated growth method by controlling the mass ratio of HAuCl4/H2PtCl6. Their electrocatalysis effects on H2O2 electrochemical oxidation were studied. Results of Uv-visible spectra (Uv-vis), transmission electronic microscopy (TEM), X-ray diffraction (XRD) and selected area electron diffraction (SAED) show that Au-Pt bimetallic nanoparticles are of face-centered cubic structure. The electrochemical performance of Au-Pt/glassy carbon (GC) electrode was investigated by cyclic voltammetry method. The result indicates that the Au-Pt/GC electrode has good electrocatalytic activity for H2O2oxidation. The catalytic efficiency is increased with more Pt content in Au-Pt alloys.


Li Z.C.,Jiangsu Teachers University of Technology | Li Z.C.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Chen S.S.,Jiangsu Teachers University of Technology | Gu A.J.,Jiangsu Teachers University of Technology | And 2 more authors.
Micro and Nano Letters | Year: 2012

Hollow urchin-like α-FeOOH was successfully prepared without template or surfactant, employing a facile route incorporating hydrothermal treatment with ammonium iron (III) sulphate solution. α-FeOOH was characterised by X-ray diffraction, thermal gravimetric analysis, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM (HRTEM) and Fourier transform infrared spectroscopy. The Ostwald ripening process was believed to be the main driving force for the formation of hollow urchin-like architectures. Furthermore, the electrochemical properties of hollow urchin-like α-FeOOH were investigated by cyclic voltammetry (CV) and galvanostatic charge-discharge measurements. The CV results implied that the capacitance was mainly associated with the redox mechanism. The specific capacitance value was 88.5F/g calculated from the discharge curve at the current density of 0.5A·g. The hollow urchin-like α-FeOOH shows a good electrochemical performance. © 2012 The Institution of Engineering and Technology.


Li Z.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Li Z.,Jiangsu Teachers University of Technology | Gu A.,Jiangsu Teachers University of Technology | Guan M.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | And 5 more authors.
Colloid and Polymer Science | Year: 2010

Silver nanowires have been synthesized by ethylene glycol reduction of silver nitrate with the assistance of polyvinyl pyrrolidone and sodium sulfide in a large scale. By adjusting the reaction temperature and Na2S content, silver nanowires with lengths up to 3-4 μm can be achieved in high yield. Scanning electron microscopy, transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), selected areas electron diffraction (SAED), and X-ray diffraction (XRD) have been employed to characterize silver nanowires. Platinum nanotubes with length about 3 μm can be prepared using as-prepared silver nanowires as sacrificial templates. Platinum nanotubes were characterized by TEM, SAED, and HRTEM. © Springer-Verlag 2010.


Li Z.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Li Z.,Jiangsu University | Gu A.,Jiangsu University | Zhou Q.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Zhou Q.,Jiangsu University
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2016

Single crystal manganese oxyhydroxide (MnOOH) nanorods were prepared under the condition of no extra template or surfactant by a simple hydrothermal route using potassium permanganate (KMnO4) as Mn source, water and N-methyl pyrrolidone (NMP) as mixed solvent. By adjusting the reaction temperature, reaction time and the volume ratio of H2O/NMP, MnOOH nanorods with lengths up to 20 μm and square cross-sections of edge lengths in the range of 50~400 nm were be facilely prepared. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and Fourier transformed infrared spectroscopy (FTIR). The formation mechanism of MnOOH nanorods was preliminarily discussed based on the Ostwald's ripening process. Furthermore, Mn2O3 nanorods were obtained by calcination of MnOOH nanorods. Results show that the morphologies of MnOOH nanorods and Mn2O3 nanorods are almost the same. Copyright © 2016, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Li Z.,Jiangsu University | Li Z.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Zou X.,Jiangsu University | Sun J.,Jiangsu University | And 3 more authors.
Micro and Nano Letters | Year: 2014

Silver nanoplates with thickness of tens of nanometres and widths in the range of 5-10 μm were successfully prepared employing a facile solution-based route based on the redox reaction between silver ions and ferrous ions. Furthermore, the influences of the mass ratio of reactants, surfactant concentration, reaction temperature and the type of surfactants on the morphologies of silver powders were carefully studied. The phase structure and morphology of silver powders are characterised by X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy. The mass ratio of reactants, concentration of surfactant, reaction temperature and the type of surfactants were crucial factors in determining the morphologies of the final products. The formation mechanism of silver nanoplates is preliminarily discussed. © The Institution of Engineering and Technology 2014.


Li Z.C.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Li Z.C.,Jiangsu Teachers University of Technology | Zhou Q.F.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Zhou Q.F.,Jiangsu Teachers University of Technology | And 3 more authors.
Micro and Nano Letters | Year: 2011

Silver nanocubes and nanorods were prepared with the assistance of sodium bromide (NaBr) through a developed polyol route. The addition of different amounts of NaBr could tune morphologies of silver nanostructures. Transmission electron microscopy, high-resolution transmission electron microscopy, selected areas electron diffraction and X-ray diffraction were employed to characterise silver nanocubes and nanorods. The growth mechanisms of silver nanocubes and nanorods were discussed by taking account of the formation of single crystal and multiply twinned seeds, respectively. © 2011 The Institution of Engineering and Technology.


Li Z.,Jiangsu University | Li Z.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Gu A.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Sun J.,Jiangsu University | And 3 more authors.
New Journal of Chemistry | Year: 2016

Hollow nickel sulfide (NiS) microspheres with mesoporous shells have been successfully synthesized via a facile hydrothermal route using nickel chloride hexahydrate (NCH) as the nickel source and thiosemicarbazide (TSC) as the sulfur source. The NH2-NH- group in the TSC molecule plays a crucial role in the formation of hollow microspheres. Ostwald ripening mechanism was suggested to explain the formation of hollow NiS microspheres with mesoporous shells. The resulting hollow NiS microspheres were further used as an electrode material for supercapacitors and found to exhibit a high specific capacitance of 1848.0 F g-1 at a discharge current density of 1 A g-1. About 74.3% of the capacity was retained as the current density increased from 1 to 10 A g-1. Furthermore, the hollow NiS microspheres electrode also exhibited excellent cycling stability at a scan rate of 50 mV s-1. The results indicate that the as-prepared hollow NiS microspheres with mesoporous shells are a promising electrode material for supercapacitors. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016.


Li Z.C.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Li Z.C.,Jiangsu Teachers University of Technology | Zhou Q.F.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering | Zhou Q.F.,Jiangsu Teachers University of Technology | Sun J.H.,Jiangsu Key Laboratory of Precious Metals Chemistry and Engineering
Micro and Nano Letters | Year: 2010

Monodisperse silver nanospheres have been synthesised in high yield by a developed polyol process, in which silver nitrate (AgNO3) was reduced by ethylene glycol (EG) with the assistance of polyvinyl pyrrolidone (PVP) and potassium iodide (KI). Both the KI concentration and reaction temperature are crucial for the morphologies and diameter distribution of silver nanostructures. Transmission electron microscopy and X-ray diffraction have been employed to characterise silver nanoparticles. The role of KI for the formation of monodisperse silver nanospheres has been discussed by taking into account the formation of silver iodide (AgI) as seeds. © 2010 The Institution of Engineering and Technology.

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