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Zhou J.,Wuhan University | Xiao H.,Wuhan University | Zhou B.,Wuhan University | Huang F.,Wuhan University | And 3 more authors.
Applied Surface Science | Year: 2015

Incorporation of high-loading redox-active materials with small amounts of graphene is a general protocol to achieve high-performance catalysts. Herein, hierarchical MoS2-reduced graphene oxide nanosheet (denoted as MoS2-rGO nanosheets) hybrids with a loading of MoS2 as high as 94wt% are synthesized. The obtained hierarchical MoS2-rGO nanosheets simultaneously integrate the structural and compositional design rationales for high-efficiency and durable electrocatalysts based on high weight ratio of MoS2 in hybrid composite, highly stable/conducting rGO, well-dispersed two-dimensional ultrathin MoS2 nanosheets, more exposed edge sites and micro/nano hierarchical structure. When evaluated as electrocatalysts for hydrogen evolution and oxygen reduction reactions, the hierarchical MoS2-rGO nanosheets demonstrates enhanced activity and excellent stability, promising their applications in MoS2 based electrochemical, photo-catalytic and photo-elecrocatalytic cells. © 2015 Elsevier B.V.

Zhu H.,Wuhan University | Li Y.,Wuhan University | Song Y.,Wuhan University | Zhao G.,Henan Electric Power Research Institute | And 4 more authors.
Materials Technology | Year: 2016

Herein, we aim to specifying effects of cyclic voltammetric scan rates, scan time, temperatures and carbon addition on electrochemical sulphation of lead disk electrodes. Electrochemical transformation between solid Pb and solid PbSO4 was investigated by cyclic voltammetries (CVs) of Pb disk electrodes in aqueous H2SO4, in line with the morphology change of electrodes before and after CV polarizations. Too rapid or slow scan rates tend to cause more irreversible sulphation. Long-duration cycling inevitably causes loss of active layer on the electrode surface and incurs more irreversible sulphation. Sulphation becomes more efficient and reversible at elevated temperature. Reversibility of sulphation of lead gets enhanced with the formation of more uniform and less crystalline particles. The irreversible sulphation became less with the addition of carbons (CNT or AB) in the electrolyte, due to lower polarizations upon carbon addition. The protocol of carbon addition is more effective at initial stage of cycling and becomes less effective at later stages. It is acknowledged that the improvement on long-term cycling remains a challenge, yet, which deserves further study. © 2016 W. S. Maney & Son Ltd.

Lu B.H.,Wuhan University | Zhou J.,Wuhan University | Li Y.Y.,Wuhan University | Xiao W.,Wuhan University | And 2 more authors.
Materials Technology | Year: 2015

Three wet chemical routes, namely, glucose assisted hydrothermal, sucrose assisted evaporation and hexadecyl trimethyl ammonium bromide assisted processes, for carbon coating on silica nanosphereswere investigated and compared. The effects of the synthetic parameters on the composition and microstructure of the final products were discussed and rationalised. The present discussion highlighted the importance of tuning the interaction between carbon source and surface of silica spheres on the microstructure and content of carbon coating. © 2015 W. S. Maney & Son Ltd.

Wang H.,Ningxia University | Li J.,Ningxia University | Yang S.,Ningxia University | Zhang B.,Ningxia University | And 4 more authors.
Materials Technology | Year: 2015

To investigate the influence of Co doping on spinel LiNi0.5Mn1.5O4 cathode, LiNi0.4Co0.1Mn1.5O4 and LiNi0.35Co0.1Mn1.5O4 were designed and successfully synthesised through a polymer assisted method. Inductively coupled plasma, X-ray diffraction, Fourier transform infrared spectra and X-ray photoelectron spectroscopy tests have been carried out. Results show that the compositions of the synthesised samples are consistent with the designed compositions, and Co doping could decrease the degree of cation ordering; Co doping together with octahedral vacancies could induce higher concentration of Mn3+ in the spinel structure. The result of cyclic voltammetry test suggests LiNi0.35Co0.1Mn1.5O4 has the best conductivity, and LiNi0.35Co0.1- Mn1.5O4 exhibited the best rate capability among the three spinel cathodes. © 2015 W. S. Maney & Son Ltd.

Wu T.,Hubei University of Education | Ma X.,Hubei University of Education | Liu X.,Hubei University of Education | Zeng G.,Hubei University of Education | Xiao W.,Jiangsu Huafu Storage New Technology Development Co.
Materials Technology | Year: 2015

Phase pure, monoclinic and nanostructured LiFePO4/C composites have been synthesised via rheological phase method at different temperatures and characterised by X-ray diffraction, thermogravimetry and SEM. The electrochemical measurements showed that calcination temperatures have great influence on the electrochemical performances of LiFePO4/C composite as the cathode materials for Li ion batteries. When the calcination temperature was 650°C, the LiFePO4/C composite showed high capacities and good cyclabilities with the discharge capacities still reaching 151.3 mA h g-1 after 50 charge-discharge cycles. It shows that the properly chosen temperature was significant for LiFePO4/C composite with good electrochemical performance for Li ions batteries application. © 2015 W. S. Maney & Son Ltd.

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