Ethanol reduced molybdenum trioxide for Li-ion capacitors

Orthorhombic molybdenum trioxide (alpha-MoO3) is a layered oxide with promising performance as electrode material for Li-ion capacitors. In this study, we show that expansion of the interlayer spacing (by similar to 0.32 angstrom) of the structure along the b-axis, introduced by partial reduction of alpha-MoO3 and formation of MoO3-x (x=0.06-0.43), results in enhanced diffusion of Li ions. Binder-free hybrid electrodes made of MoO3-x nanobelts and carbon nanotubes show excellent electrical conductivity. The combination of increased interlayer spacing and enhanced electron transport leads to high gravimetric and volumetric capacitances of about 420 F/g or F/cm(3) and excellent cycle life of binder-free MoO3-x electrodes. (C) 2016 Elsevier Ltd. All rights reserved.