We report the synthesis of two dimensional (2D) Co 3 S 4 in nano thickness sheet-like morphology via simple hydrothermal process and its application towards electrochemical energy storage devices. Presence of unique mesopores with combination of core/shell nanoparticles in the nanosheets showed superior electrochemical performances as negative electrode for Li-ion (LIB) and electro-catalyst in Li-O 2 battery applications. High discharge capacity of ~968 mAh g -1 is noted after 60 cycles with excellent cycling stability when evaluated as anode for LIB. On the other hand, first discharge capacity of ~5917 mAh g -1 is observed with high reversibility of 95.72% for Li-O 2 battery point of view. This exceptional electrochemical performance in both applications is mainly attributed to the presence of mesoporous with core/shell 2D nanostructure, which translates more catalytic bi-functional (oxygen reduction reaction/oxygen evolution reaction) active sites for Li-O 2 and sustains the volume variations occurred in 3D way upon charge/discharge process for LIB applications. Ex-situ studies, like TEM, XPS and impedance spectroscopy are also carried out to validate the reaction mechanisms.

No abstract

a-and d-MnO 2 nanomaterials with different morphology like urchins and flowers are successfully synthesized by a low temperature hydrothermal synthesis. The prepared nanostructures were applied as electrocatalysts for air cathodes in Li air batteries. The synthesized materials possess high electrocatalytic activity and the MnO 2 catalysed electrodes doubled the initial cycling capacity of the Li air cells without any catalysts. We also observed reduced over potential and upon cycling with limited capacity, a very stable performance was obtained.

No abstract

No abstract