TY - JOUR
T1 - Unprecedented Capacity and Stability of Ammonium Ferrocyanide Catholyte in pH Neutral Aqueous Redox Flow Batteries
AU - Luo, Jian
AU - Hu, Bo
AU - Debruler, Camden
AU - Bi, Yujing
AU - Zhao, Yu
AU - Yuan, Bing
AU - Hu, Maowei
AU - Wu, Wenda
AU - Liu, T. Leo
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2019/1/16
Y1 - 2019/1/16
N2 - Aqueous organic/organometallic redox flow batteries (AORFBs) have gained increasing attention for large-scale storage of intermittent renewable energy (e.g., solar and wind) due to the advantages of decoupled energy and power, high current and power performance, safety features, and synthetic tunability of charge storage molecules. Here, we report the synthesis and physicochemical properties of highly water-soluble (NH 4 ) 3 [Fe(CN) 6 ] and (NH 4 ) 4 [Fe(CN) 6 ] catholyte materials and their application in pH neutral AORFBs. A 1.5 M half-cell (NH 4 ) 3 [Fe(CN) 6 ]/(NH 4 ) 4 [Fe(CN) 6 ] redox flow battery confirmed the high capacity and stability of ammonium ferrocyanide catholyte at pH neutral conditions. Paired with 1,1′-bis(3-sulfonatopropyl)-4,4′-bipyridinium ((SPr) 2 V) anolyte, a 0.9 M symmetric (NH 4 ) 4 [Fe(CN) 6 ]/(SPr) 2 V AORFB free of supporting electrolytes exhibited excellent cycling performance including nearly 100% capacity retention in 1,000 cycles (1,100 testing hours), 62.6% energy efficiency at 40 mA/cm 2 operation current density, and a power density of 72.5 mW/cm 2 , representing the most stable AORFB reported so far.
AB - Aqueous organic/organometallic redox flow batteries (AORFBs) have gained increasing attention for large-scale storage of intermittent renewable energy (e.g., solar and wind) due to the advantages of decoupled energy and power, high current and power performance, safety features, and synthetic tunability of charge storage molecules. Here, we report the synthesis and physicochemical properties of highly water-soluble (NH 4 ) 3 [Fe(CN) 6 ] and (NH 4 ) 4 [Fe(CN) 6 ] catholyte materials and their application in pH neutral AORFBs. A 1.5 M half-cell (NH 4 ) 3 [Fe(CN) 6 ]/(NH 4 ) 4 [Fe(CN) 6 ] redox flow battery confirmed the high capacity and stability of ammonium ferrocyanide catholyte at pH neutral conditions. Paired with 1,1′-bis(3-sulfonatopropyl)-4,4′-bipyridinium ((SPr) 2 V) anolyte, a 0.9 M symmetric (NH 4 ) 4 [Fe(CN) 6 ]/(SPr) 2 V AORFB free of supporting electrolytes exhibited excellent cycling performance including nearly 100% capacity retention in 1,000 cycles (1,100 testing hours), 62.6% energy efficiency at 40 mA/cm 2 operation current density, and a power density of 72.5 mW/cm 2 , representing the most stable AORFB reported so far.
KW - anolyte
KW - batteries
KW - catholyte
KW - energy storage
KW - ferrocyanide
KW - molecular engineering
KW - redox active molecules
KW - redox flow battery
KW - viologen
UR - http://www.scopus.com/inward/record.url?scp=85059626978&partnerID=8YFLogxK
U2 - 10.1016/j.joule.2018.10.010
DO - 10.1016/j.joule.2018.10.010
M3 - Article
AN - SCOPUS:85059626978
SN - 2542-4351
VL - 3
SP - 149
EP - 163
JO - Joule
JF - Joule
IS - 1
ER -
