Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 72, Issue 8, Pages 1253-1266Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2019.1612054
Keywords
Cathode; zinc intercalation; EXAFS; XANES; coordination
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Funding
- office of the VPAA of D'Youville College
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An interesting nanostructured non-stoichiometric vanadium oxide bronze (CaxV2O5 center dot yH(2)O) is incorporated as the active material in an aqueous zinc-ion intercalation device. Simple solvothermal synthesis route produces highly crystalline and strongly oriented nanobelt structures as characterized by microscopy. Upon cycling, the cathode materials are recovered for an X-ray absorption investigation of local electronic and geometric changes for both the host vanadium oxide and the intercalated zinc ion as a function of voltage. This multi-edge study presents changes in Zn-O coordination and suggests Zn-ion occupancy site through theoretical calculations. The layered vanadium host shows gradual oxidation state reduction from charge density donation during intercalation while the Zn ion maintains the +2 oxidation state. The findings add understanding to the mechanisms involved in aqueous electrochemical storage devices.
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