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Cobalt Nitride and Carbon Nanofiber Composites for Oxygen Electrocatalysis
윤기로 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Oxygen electrocatalysis has attracted a growing attention because it is a key of various sustainable energy conversion and storage systems. However, slow kinetics of oxygen based reactions (i.e., oxygen reduction and oxygen evolution reaction (OER and OER)) are often hampering their energy efficiency due to large overpotentials for driving the proper reactions. Metal nitrides are considered as a promising electrocatalysts due to their metallic conductivity and excellent catalytic activities. Here, we report cobalt nitride (Co<sub>4</sub>N)/carbon nanofiber(CNF) hybrid as a highly efficient and cost-effective bifunctional catalysts. We figure out that electrospun CNFs containing nitrogen dopants role as a continuous charge transport channel, and the metallic Co<sub>4</sub>N nanorods grown on CNFs provide OER active sites and synergistic ORR functions. Their catalytic roles are demonstrated via DFT calculations and outstanding stabilities are confirmed in both aqueous and nonaqueous applications.
용액 코팅법을 통한 연료전지용 불소계 전해질 강화복합막의 특성에 미치는 분산용매의 영향
육승호,윤기로,최지훈,이주성,김종민,이승우,이관영,김진영 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.3
the recent, as a world demand of energy resources has been transformed from fossil fuels to hydrogenbased clean energy resources, a huge attention has been attracted to increase the performance and decrease a production cost of core materials in fuel cell technology. The utilization of reinforced composite membranes as electrolytes in the polymer electrolyte membrane fuel cells can reduce the use of high cost perfluorosulfonic acid (PFSA), mitigate the cell impedance, and improve the dimensional stability as well as the interfacial stability, giving rise to achieve both an improved performance and a reduction of production costs of the fuel cell devices. In this study, we investigate the effects of physical characteristics and cell performances according to the various ionomer solvents in the solution based manufacturing process of reinforced composite electrolyte membrane. 최근 화석연료기반에서 친환경 수소 기반의 청정에너지원으로 전환되는 세계적 흐름에 따라, 수소연료전지의 고성능저가격 핵심 소재 기술 개발에 많은 관심이 이루어지고 있다. 그 가운데 연료전지의 전해질로 사용되는 강화복합막의기술 도입은 과불소계 술폰산 이오노머(Perfluorosulfonic acid, PFSA) 양의 감소 및 막 두께 감소를 통한 가격 저감 및셀 저항 감소, 치수 안정성 개선 그리고 계면 안정성에 대한 확보가 가능하여 최종적으로 연료전지 성능 향상과 가격절감이 동시에 가능하다. 본 연구에서는 연료전지용 불소계 전해질 강화복합막 코팅 공정에서 이오노머 분산용매에 따라 막 형성 및 물성 변화와 연료전지 성능에 미치는 영향에 대해 연구하였다.