Water affinity of vanadium electrolytes

Catherine Lenihan, Daniela Oboroceanu, Nathan Quill, Deirdre Ni Eidhin, Andrea Bourke, Robert P. Lynch, D. Noel Buckley

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Citations (Scopus)

Abstract

Rates of water transfer across a Nafion membrane between vanadium electrolytes (Vv, VIV, VIII, and VII,) and H2SO4solutions of various concentrations were measured and the H2SO4 concentration corresponding to a zero-transfer rate was thus estimated. The difference in sulfate concentration between an electrolyte and the equivalent H2SO4solution varies considerably with the oxidation state of the vanadium. The value is close to zero for V™ but has a large positive value for Vv and large negative values for Vm and V". Both the water affinity, defined in terms of the chemical potential of water, and the thermodynamic activity of water was estimated for vanadium electrolytes at 25°C from the measured values of equivalent H2SO4 concentration. The water affinity increases in the order Vn = VIII, < Vw < VV, and the activity of water in the order Vv < V™ < Vm = Vn< H2O.

Original languageEnglish
Title of host publicationECS Transactions
PublisherElectrochemical Society, Inc.
Pages175-189
Number of pages15
Edition13
ISBN (Electronic)9781607688419
ISBN (Print)9781510866171
DOIs
Publication statusPublished - 2018
Externally publishedYes
Event233rd Meeting of the Electrochemical Society - Seattle, United States
Duration: 13 May 201817 May 2018

Publication series

NameECS Transactions
Number13
Volume85
ISSN (Print)1938-6737
ISSN (Electronic)1938-5862

Conference

Conference233rd Meeting of the Electrochemical Society
Country/TerritoryUnited States
CitySeattle
Period13/05/201817/05/2018

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