Hwang, Jinyeon Kim, Bo-mi Moon, Joonhee Mehmood, Asad Ha, Heung Yong 2024-01-19T23:03:51Z 2024-01-19T23:03:51Z 2021-09-03 2018-03-21 2050-7488 https://pubs.kist.re.kr/handle/201004/121591 The vanadium redox flow battery (VRFB) is one of the most promising energy storage systems for large-scale applications. However, its commercialization has been hampered due to the low thermal stability and slow kinetics of the positive electrolyte. To solve these problems, we applied taurine and its derivatives containing both amine (-NH2) and sulfonic acid (-SO3H) groups as organic additives. Among these candidates, taurine showed the lowest overpotential and the fastest reaction kinetics, which resulted in high energy efficiency (87.9% at 50 mA cm(-2)) and capacity retention (87.6% after 100 cycles). Taurine was found to improve the thermal stability of the positive electrolyte by forming a vanadium-additive complex, suppressing irreversible precipitation at high temperature. Additionally, -NH2 and -SO3H groups in taurine induced nitrogen/sulfur bifunctional doping on the carbon electrode, which increased the wettability and reversibility by enhancing charge transfer and mass transport rates. Through this functional group-oriented approach that introduces taurine into the positive electrolyte, we believe that an important breakthrough has been made in VRFB technologies, which could significantly improve the VRFB performance and direct a lot of attention towards new organic additives for various redox flow batteries. English ROYAL SOC CHEMISTRY HIGH-ENERGY-DENSITY NUCLEAR-MAGNETIC-RESONANCE COORDINATION CHEMISTRY NEGATIVE ELECTRODE SULFAMIC ACID CARBON GRAPHENE OXYGEN STABILITY ELECTROCATALYST A highly efficient and stable organic additive for the positive electrolyte in vanadium redox flow batteries: taurine biomolecules containing -NH2 and -SO3H functional groups Article 10.1039/c7ta10211a 1 JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.11, pp.4695 - 4705 JOURNAL OF MATERIALS CHEMISTRY A 6 11 4695 4705 scie scopus 000428848400015 2-s2.0-85043784820 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article ELECTROCATALYST HIGH-ENERGY-DENSITY NUCLEAR-MAGNETIC-RESONANCE COORDINATION CHEMISTRY NEGATIVE ELECTRODE SULFAMIC ACID CARBON GRAPHENE OXYGEN STABILITY Redox flow battery organic additive taurine stability