Highly porous off-stoichiometric tungsten trioxide (WO3-σ) with hollow and yolk-shell structures have been successfully synthesized via a selective leaching strategy, following hydrogenation using PbWO4 spheres as the starting material. It was found that the yolk-shell WO3-σ could be obtained from hollow WO3-σ by dividing the continuous leaching process into two intervallic processes. The unique structural features and high conductivity facilitate both ion and electron transport, greatly enhancing reversible lithium storage capacity. In comparisons of the hollow WO3-σ and yolk-shell WO3-σ, the yolk-shell structure exhibited more long-term stability due to extra spatial elasticity.
Bibliographical noteFunding Information:
We gratefully acknowledge the National Research Foundation of Korea ( NRF-2016 R1A2B1015504 ) for financial support. D. Choi is thankful for the support from the National Research Foundation of Korea ( NRF-2015R1D1A1A01060947 ). W.X. Wang and X.H. Meng contributed equally to this work.
© 2016 Elsevier Ltd
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)