A higher voltage Fe(II) bipyridine complex for non-aqueous redox flow batteries
Abstract
Non-aqueous redox flow batteries (RFBs) offer the possibility of higher voltage and a wider working temperature range than their aqueous counterpart. In this study, we optimize the established 2.26 V Fe(bpy)3(BF4)2/Ni(bpy)3(BF4)2 asymmetric RFB to lessen capacity fade and improve energy efficiency over 20 cycles. We also prepared a family of substituted Fe(bpyR)3(BF4)2 complexes (R = –CF3, –CO2Me, –Br, –H, –tBu, –Me, –OMe, –NH2) to potentially achieve a higher voltage RFB by systematically tuning the redox potential of Fe(bpyR)3(BF4)2, from 0.94 V vs. Ag/AgCl for R = OMe to 1.65 V vs. Ag/AgCl for R = CF3 (ΔV = 0.7 V). A series of electronically diverse symmetric and asymmetric RFBs were compared and contrasted to study electroactive species stability and efficiency, in which the unsubstituted Fe(bpy)3(BF4)2 exhibited the highest stability as a catholyte in both symmetric and asymmetric cells with voltage and coulombic efficiencies of 94.0% and 96.5%, and 90.7% and 80.7%, respectively.
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Org.:
- USDOE Office of Electricity (OE); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1760461
- Alternate Identifier(s):
- OSTI ID: 1737712
- Report Number(s):
- SAND-2020-11070J
Journal ID: ISSN 1477-9226; 691487
- Grant/Contract Number:
- AC04-94AL85000; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Dalton Transactions
- Additional Journal Information:
- Journal Volume: 50; Journal Issue: 3; Journal ID: ISSN 1477-9226
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Cammack, Claudina X., Pratt, Harry D., Small, Leo J., and Anderson, Travis M. A higher voltage Fe(II) bipyridine complex for non-aqueous redox flow batteries. United States: N. p., 2020.
Web. doi:10.1039/d0dt03927f.
Cammack, Claudina X., Pratt, Harry D., Small, Leo J., & Anderson, Travis M. A higher voltage Fe(II) bipyridine complex for non-aqueous redox flow batteries. United States. https://doi.org/10.1039/d0dt03927f
Cammack, Claudina X., Pratt, Harry D., Small, Leo J., and Anderson, Travis M. Mon .
"A higher voltage Fe(II) bipyridine complex for non-aqueous redox flow batteries". United States. https://doi.org/10.1039/d0dt03927f. https://www.osti.gov/servlets/purl/1760461.
@article{osti_1760461,
title = {A higher voltage Fe(II) bipyridine complex for non-aqueous redox flow batteries},
author = {Cammack, Claudina X. and Pratt, Harry D. and Small, Leo J. and Anderson, Travis M.},
abstractNote = {Non-aqueous redox flow batteries (RFBs) offer the possibility of higher voltage and a wider working temperature range than their aqueous counterpart. In this study, we optimize the established 2.26 V Fe(bpy)3(BF4)2/Ni(bpy)3(BF4)2 asymmetric RFB to lessen capacity fade and improve energy efficiency over 20 cycles. We also prepared a family of substituted Fe(bpyR)3(BF4)2 complexes (R = –CF3, –CO2Me, –Br, –H, –tBu, –Me, –OMe, –NH2) to potentially achieve a higher voltage RFB by systematically tuning the redox potential of Fe(bpyR)3(BF4)2, from 0.94 V vs. Ag/AgCl for R = OMe to 1.65 V vs. Ag/AgCl for R = CF3 (ΔV = 0.7 V). A series of electronically diverse symmetric and asymmetric RFBs were compared and contrasted to study electroactive species stability and efficiency, in which the unsubstituted Fe(bpy)3(BF4)2 exhibited the highest stability as a catholyte in both symmetric and asymmetric cells with voltage and coulombic efficiencies of 94.0% and 96.5%, and 90.7% and 80.7%, respectively.},
doi = {10.1039/d0dt03927f},
journal = {Dalton Transactions},
number = 3,
volume = 50,
place = {United States},
year = {Mon Dec 14 00:00:00 EST 2020},
month = {Mon Dec 14 00:00:00 EST 2020}
}
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