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정향수,황연진,권예랑,조영석,윤창원 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Formic acid (FA, HCOOH) has been regarded as a promising hydrogen storage material (53 g/L) because of its mild reaction conditions upon dehydrogenation. Its conjugate base, formate salt (FS, MHCO2, M = Na, K, NH4), receives less attention as a hydrogen storage material (28 g/L) due to its low hydrogen storage capacity and reactivity. However, FS presents several advantages over FA for its low toxicity and thermodynamic adequacy for reversible hydrogen storage and release by coupling to a bicarbonate salt. In this presentation, physiochemical and thermodynamic properties of formate and bicarbonate cycle are presented to understand the storage and deliverable hydrogen capacity. In addition, catalytic performances upon dehydrogenation reactions of various FS depending on the reaction temperature and concentration are presented for fuel cell power applications.
Liquid Organic Hydrogen Carriers (LOHCs) for High-Capacity Energy Storage-Conversion
윤창원,조영석,손현태,정향수,김용민,남석우 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Sustainable and clean energy carriers alternative to fossil fuels are being explored to mitigate the increasing energy and environmental issues. Hydrogen has been considered as a viable renewable energy carrier owing to its high gravimetric energy storage density of ca. 33.3 kWh·kg-1. However, the low volumetric energy density of gaseous hydrogen limited its use for numerous energy applications particularly associated with high capacity and long distance hydrogen transportation. In the context, a safe hydrogen storage system capable of transporting large quantities of hydrogen in a liquid form has attracted particular attention. In the presentation, numerous liquid organic hydrogen carriers (LOHC) applicable to different fuel cell applications are introduced and their hydrogenation and dehydrogenation properties will be discussed.
고상수소저장체 기반 고출력 수소저장시스템 : From Concept to 20 kW On-board System
이재용(Jaeyong Lee),김평순(Pyungsoon Kim),서지희(Jihui Seo),김한진(Hanjin Kim),박지혜(Jihye Park),장지훈(Jihoon Jang),곽재원(Jaewon Kirk),김윤도(Yoondo Kim),정향수(Hyangsoo Jeong),김용민(Yongmin Kim) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
In resent automobile industry, the research for increasing hydrogen storage density, compared to the compressed hydrogen method, is being conducted for stable hydrogen storage and improvement of mileage in various on-board systems including fuel cell electric vehicles (FCEVs). Sodium Borohydride (NaBH4, SBH) is a solid-state hydrogen storage material which is possible to generate hydrogen instantly by adding water and acid catalysts. SBH is possible to store hydrogen stably at room temperature and ambient pressure. (10.8 wt.%, theoretically) In this study, we investigated the reaction conditions for increasing the amount of hydrogen extraction. Based on this result, we designed a reactor system that can control heat and pressure during the dehydrogenation reaction to secure driving a 20 kW fuel cell. Through this study, we present the possibility of the on-board hydrogen storage system with a higher hydrogen storage density and power.