Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 37, Pages 11556-11559Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b03959
Keywords
-
Categories
Funding
- United State National Science Foundation [1551693]
- Wei Family Foundation
- China Scholarship Council [201606830041]
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1551693] Funding Source: National Science Foundation
Ask authors/readers for more resources
This study reveals the transport behavior of lattice water during proton (de)insertion in the structure of the hexagonal WO3 center dot 0.6H(2)O electrode. By monitoring the mass evolution of this electrode material via electrochemical quartz crystal microbalance, we discovered (1) WO3 center dot 0.6H(2)O incorporates additional lattice water when immersing in the electrolyte at open circuit voltage and during initial cycling; (2) The reductive proton insertion in the WO3 hydrate is a three-tier process, where in the first stage 0.25 H+ is inserted per formula unit of WO3 while simultaneously 0.25 lattice water is expelled; then in the second stage 0.30 naked H+ is inserted, followed by the third stage with 0.17 H3O+ inserted per formula unit. Ex situ XRD reveals that protonation of the WO3 hydrate causes consecutive anisotropic structural changes: it first contracts along the c-axis but later expands along the ab planes. Furthermore, WO3 center dot 0.6H(2)O exhibits impressive cycle life over 20 000 cycles, together with appreciable capacity and promising rate performance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available