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구조유도 연소반응 기반 금속 폼 내부의 탄소막 코팅 및 슈퍼 커패시터 전극 응용
황하영(Hayoung Hwang),신동준(Dongjoon Shin),김태원(Taewon Kim),박성현(Seonghyun Park),여태한(Taehan Yeo),최원준(Wonjoon Choi) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Hybrid structures based on porous metal foam have proven their versatile utilization for electrochemical applications. The porous metal foam provides large-surface area and conductive path for charging-discharging, while additional coatings on the foam enable the functional extension. However, the fabrication of the functional coatings requires the complex process which incur the high-cost. In this work, we report a facile fabrication route of carbon coating layers on the inner surfaces of the porous metal foam, based on structure-guided combustion waves (SGCWs) and their applications for developing supercapacitor electrodes. SGCWs passing through the hybrids of nickel foams and chemical fuels directly enabled the fabrication of the carbon coatings on the inner nickel backbones as core-shell Ni@C, because incompletely combusted carbonaceous fuels remained as amorphous carbon coatings. The carbon coatings were used as templates for MnO2 shells to synthesize the core-shell Ni@MnO2 foams, as supercapacitor electrodes which showed the outstanding specific capacitance (~660 F/g) and capacitance retention (~95.4% more than 10,000 cycles).
나노소재 구조 및 연료 변화에 따른 열동력 파도 현상 최적화
여태한(Taehan Yeo),황하영(Hayoung Hwang),최원준(Wonjoon Choi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Recently, the new energy conversion concept from chemical to electrical energy, called as thermopower wave was newly reported. It can directly generate electrical energy when hybrid core-shell structure between nanomaterial and chemical fuel is combusted. At first the phenomenon of thermopower wave was investigated on the same axle of 1d hybrid structure between carbon nanotube(CNT) and chemical fuel. When the surface of 1d hybrid structure combusted, the reaction of combustion was accelerated to the axis of CNT and the specific voltage was spontaneously produced from inside of nanotube. The current study have been only concentrated to identify it and find the mechanism In this work, we study the optimized structure and arrangement of nanomaterial and then measure the electrical energy changes from various kinds of fuels which act with combustion reaction. We evaluated the specific effect of structure from 1d aligned structure, 2d random network film and 3D bulk structure coated by various fuels. We also investigated the electrical energy depending on the types of combustible materials based on 1d aligned structure.
멀티스케일 복합 구조 기반 열-유체-에너지 전달 현상 제어
최원준(Wonjoon Choi),황하영(Hayoung Hwang),여태한(Taehan Yeo),신동준(Dongjoon Shin),서병석(Byungseok Seo),강성구(Sunggu Kang),이상준(Sang Jun Lee),서경범(Kyungbeom Seo),이재민(Jaemin Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Hybrid structures from nano-microscale to macroscale contribute to further manipulation of thermal-fluidic-energy transport making them useful in many applications. I will introduce ongoing researches utilizing thermal-fluidic-energy transports in hybrid structures. Topics will cover (1) Layer-by-Layer (LbL)-based coatings of porous structures for enhanced phase change heat transfer, (2) nanofluidic sensing of micro-nanomaterials using aqueous two-phase system, (3) active control of materials properties using structural and physicochemical transformation via the structure-guided combustion waves for the fabrication of energy materials, (4) local thermal energy control through thermal metamaterials using the manipulation of continuum heat transfer, (5) self-sustaining liquid-motion-sensing platform for continuous monitoring of dynamics using thermoelectrics and triboelectrics and (6) thermal analyses in hybrid systems, such as photo-thermal or electrical-thermal interaction.