Kwon, Giyun Lee, Kyunam Yoo, Jaekyun Lee, Sechan Kim, Jihyeon Kim, Youngsu Kwon, Ji Eon Park, Soo Young Kang, Kisuk 2024-01-19T13:32:25Z 2024-01-19T13:32:25Z 2021-10-21 2021-11 2405-8297 https://pubs.kist.re.kr/handle/201004/116239 Organic redox flow batteries (ORFBs) have recently drawn significant attention as cost-effective and scalable energy storage systems, utilizing the distinct features of redox-active organic materials (ROMs), which offer chemical diversity and potential mass-scalability. Nevertheless, their inferior cycle performance compared with that of conventional inorganic-based RFBs is one of the major drawbacks limiting their practical application, which is often attributable to the chemical instability of charged ROMs during long-term operation. Herein, we present an ultra-stable triphenylamine-based molecule, tris(4-methoxyphenyl)amine or 3MTPA, which exhibits a highly stable redox reaction and rapid kinetics as a catholyte in non-aqueous media. It is demonstrated that the 3MTPA catholyte exhibits exceptionally robust radical cation stability, enabling its retention of near the theoretical capacity even after 168 h of high temperature storage in a fully charged state, while most known ROMs have not been able to achieve it and suffer from the significant degradation. Moreover, a flow cell exploiting 3MTPA is capable of delivering an unprecedentedly high capacity retention of 99.998% per cycle over 1400 cycles, opening up a new pathway toward highly durable ORFBs. English Elsevier BV Highly persistent triphenylamine-based catholyte for durable organic redox flow batteries Article 10.1016/j.ensm.2021.07.006 1 Energy Storage Materials, v.42, pp.185 - 192 Energy Storage Materials 42 185 192 N scie scopus 000702774100006 2-s2.0-85111484194 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article GAUSSIAN-BASIS SETS ENERGY-STORAGE ATOMS LI DERIVATIVES ELECTROLYTES TEMPERATURE MOLECULE PROGRESS Energy storage Redox flow batteries Redox-active organic materials Non-aqueous organic redox flow batteries