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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.
다양한 실리카 원과 결정화 촉진제를 이용한 나노크기의 TPA-Silicalite-1 제조
김예솔 ( Ye Sol Kim ),조세호 ( Se Ho Cho ),박세국 ( Se Kook Park ),전재덕 ( Jae Deok Jeon ),이영석 ( Young Seak Lee ) 한국공업화학회 2014 공업화학 Vol.25 No.3
In this study, nanosized TPA-silicalite-1 was synthesized with a suitable molar composition of TPAOH: SiO2: H2O for thedevelopment of zeolite ceramic membranes to utilize as gas separation. As silica sources, TEOS, LUDOX AS-40 andCAB-O-SIL were used with the starting material of TPAOH. NaH2PO4, and a variety of acids and bases were used as promotersafter TPAOH, SiO2, H2O gel synthesis. To decrease synthesis time, a two step temperature change method was appliedto the synthesis of TPA-silicalite-1 at a low temperature. TPA-silicalite-1 synthesized was analyzed with XRD, SEM, BETand TGA. As a result, TPA-silicalite-1 powders with a particle size of 100 nm and a specific surface area of 416 m2/g wereobtained as optimum synthesis conditions when the two stage temperature change method was used with NaH2PO4 as promoter.