TY - GEN
T1 - Water affinity of vanadium electrolytes
AU - Lenihan, Catherine
AU - Oboroceanu, Daniela
AU - Quill, Nathan
AU - Eidhin, Deirdre Ni
AU - Bourke, Andrea
AU - Lynch, Robert P.
AU - Buckley, D. Noel
N1 - Publisher Copyright:
© 2018 Electrochemical Society Inc. All Rights Reserved.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85056868221&partnerID=8YFLogxK
U2 - 10.1149/08513.0175ccst
DO - 10.1149/08513.0175ccst
M3 - Conference contribution
AN - SCOPUS:85056868221
SN - 9781510866171
T3 - ECS Transactions
SP - 175
EP - 189
BT - ECS Transactions
PB - Electrochemical Society Inc.
T2 - 233rd Meeting of the Electrochemical Society
Y2 - 2 October 2016 through 17 May 2018
ER -