One-pot solvothermal process is adopted to develop, 3D hierarchical Fe3O4 nanoparticles supported 2D reduced graphene oxide sheets (Fe3O4/r-GO) as possible negative electrodes for lithium ion batteries. The synthesis parameters are optimized to prepare agglomeration-free Fe3O4 nanostructures with uniform size and shape on r- GO. The field emission ...
Nowadays, much progress has been made in designing practical high-energy-density anode materials for lithium-ion batteries (LIBs). However, during repeated charge-discharge cycles, high-energy-density anode materials usually undergo large volume changes, which results in a limited cycle life. The situation is worse when anode materials have high ta...
A designed electrode material of carbon-encapsulated tin dioxide core-shell nanowires that are synthesized directly on reduced graphene oxide substrates is reported, and its application as a positive electrode material for lithium-ion battery is shown. Each of the individual tin dioxide nanowires is wrapped with carbon shell layers and grown on a r...
T-Nb2O5/reduced graphene oxide nanohybrids were fabricated via the hydrothermal attachment of Nb2O5 nanowires to dispersed graphene oxide nanosheets followed by a high-temperature phase transformation. Electrochemical measurements showed that the nanohybrid anodes possessed enhanced reversible capacity and superior cycling stability compared to tho...
A scalable, cost effective synthesis of reduced graphene oxide (RGO)-magnesium oxide (Mg0) hybrid nano composite (RGOMOHNC) is reported in the present work. The process involves an in-situ sonication method in aqueous medium at room temperature e.g., 30 degrees C. The as synthesized graphene oxide (GO) and RGOMOHNC powders are characterized by the ...
Despite being a promising anode material for the Na-ion battery system, Na-titanate (viz., Na2Ti3O7) lacks in terms of cyclic stability; the cause(s) for which are under debate. Against this backdrop, through electrochemical measurements and insitu synchrotron X-ray diffraction studies, the present work develops insights into the aspects concerning...
Metallic Sn has high conductivity and high theoretical capacity for lithium storage but it suffers from severe volume change in lithiation/delithiation leading to capacity fade. Yolk-shell and core-shell Sn@C spheres interconnected by carbon nanofibers were synthesized by thermal vapor and thermal melting of electrospun nanofibers to improve the cy...
Published in Nature Communications
Exsolution is attractive for the preparation of catalytically active metal nanoparticles, but versatility is limited. Here the authors report a technique for selective exsolution through topotactic ion exchange, leading to an electrocatalyst for a solid oxide fuel cell with enhanced performance.
A novel combined method using modified methane pulses and in-situ Raman spectroscopy together with mass spectrometry is applied to impregnated Ni/gadolinium-doped ceria (CGO). The partial oxidation of methane is deduced to proceed via a Mars-van-Krevelen type mechanism composed of initial methane decomposition together with carbon oxidation by oxyg...
As one of the promising anodes for lithium ion battery, MoS2 is attracting widespread attention because of its high abundance, low cost, and high theoretical capacity. In this work, a designed robust structure of ultrathin O-doped MoS2 nanosheets with expanded interlayer spacing in situ grown on the carbon microtubes is proposed and investigated as...
