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Liquid State with Multi-electron Active Molecule for High Energy Density Redox Flow Battery
Sang-Soon Jang(장상순),Se-Kook Park(박세국),Sun-Hwa Yeon(연순화),Kyoung-Hee Shin(신경희),Han-Su Kim(김한수),Chang-Soo Jin(진창수) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
With the shift of energy resources to renewable energy, energy storage systems (ESS) have been in charge of a critical role in the efficient energy management of renewable energy resources. Vanadium utilizing aqueous redox flow batteries (VRFBs) with their scalability (up to MW and MWh), long lifetime, and safety features are promising options for large-scale ESS. Although VRFB has been commercialized by numerous companies, it suffers from several challenges that limit its widespread application, particularly due to low energy density (〈 20-35 Wh L<sup>-1</sup>). Therefore, organic redox-active molecules featured with potentially low cost and molecular engineering have been targeted as alternatives. For the high energy density of the RFB, the solubility of the active molecule should be as high as possible, as well as the number of electrons transferred in the reaction should be many. If the active molecule itself is liquid so that utilized as a solo electrolyte or dissolves the salt, high energy density can be achieved. Therefore, the liquid state with multi-electron organic redox-active species would be one of the best strategies for high energy density RFB. In this study, the liquid state with multi-electron organic redox-active molecule was synthesized by applying the mechanism of room temperature ionic liquids to viologen structure. Through the ongoing optimization work of critical cell materials, significant increases in the performance of high energy density RFB can be expected.
TiO<sub>2</sub> 나노튜브 형상에 미치는 NH<sub>4</sub>F와 H<sub>2</sub>O의 영향
김건두 ( Geon-du Gim ),장상순 ( Sang-soon Jang ),김희산 ( Heesan Kim ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.3
The aim of this work is the attainment of the TiO<sub>2</sub>-nanotube photocatalytic-growth condition using anodization, whereby the NH<sub>4</sub>F-H<sub>2</sub>O weight ratio is appropriately controlled. We fabricated the TiO<sub>2</sub> nanotubes using a two-step anodization (first step is 1 hr; second step is 30 hr) under the ambient pressure and the room temperature at 60 V in ethylene-glycol solutions to investigate the effects of the NH<sub>4</sub>F(0.1,0.3,0.5wt%) and H<sub>2</sub>O(1-3wt%) on the Ti<sub>O</sub>2-nanotube geometry and the photocatalytic efficiency. Further, the decomposition efficiency of the methylene blue on the Ti<sub>O</sub>2 nanotubes by the UN radiation depended on the geometrical change of the nanotube geometry, indicating the proportionality of the decomposition efficiency to the surface area that was affected by the NH4F and H<sub>2</sub>O concentrations. As the NH4F weight was increased, the surface area initially decreased but slightly increased later, and the length consistently increased. As the H<sub>2</sub>O weight was increased, the surface area and length initially increased, but later decreased with the 3 wt% H<sub>2</sub>O.