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전태열 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Pt-Ni alloy nanocrystals with Pt-enriched shell were prepared by chemical dissolution of Ni. The changes in electronic and geometric structure of the alloy nanoparticles at surface were elucidated from electrochemical surface area, potential of zero total charge, and relative surface roughness. It was found that sulfuric acid-treated Pt-Ni catalyst showed the lower activity and durability despite its higher surface Pt concentration and alloying level. In this presentation, we propose new electrochemical method of calculating relative surface roughness by measuring adsorption/desroption behaviors of carbon monoxide and carbon dioxide molecules. In this work, it was revealed that surface roughness plays a critical role to improve electrochemical performance of Pt-Ni alloy catalysts with Pt-rich surfaces. In addition, combination of the displacement experiments can be employed as an efficient probe for estimating the surface roughness change of Pt-based bimetallic nanoparticles.
질량이 증가하는 회전형 역진자에 대한 저렴한 비용의 견고한 제어기 개발
전태열,이영찬,심명보,정병건 한국마린엔지니어링학회 2019 한국마린엔지니어링학회지 Vol.43 No.6
The control of a rotary inverted pendulum is a high-order, unstable, multi-variable, and nonlinear system. When a disturbance occurs, it does not stabilize by itself. However, since it is widely used in space equipment, robot leg control and upright rocket have been extensively studied in modern control research. Previous research has mainly focused on how fast the swing-type inverted pendulum will swing up using the energy that minimizes the movement of the pendulum. However, in this paper, a controller was designed to swing up the mass of the rotating-type pendulum. Studies on the rotary-type pendulum have been performed using a high-end PC, but in this study, the swing-up performance was improved using a low-cost 8-bit AVR-ATmega128. 회전형 역진자의 제어는 고차, 불안정, 다변수, 비선형의 시스템이며, 외란이 발생하면 자체적으로 안정화되지 못하는 특성이 있지만, 로봇의 다리 제어 및 로켓트 직립 등에서 많이 사용되기 때문에 현대제어시스템 연구에서 매우 많이 다루어졌다. 그러한 기존 연구들은 회전형 역진자를 얼마나 빠른 시간 내에 스윙 업을 시킬 것인지 또는 진자의 움직임을 최소로 하여 에너지를 절감하여 스윙업을 할 것인지가 주로 연구되었었다. 하지만, 본 논문은 회전형 역진자의말단부나 진자의 축부분에 매스(Mass) 부착하여 스윙업을 하도록 제어기를 설계하고 실증 실험하였다. 또한 회전형 역진자에 관한 연구들은 고급사양의 PC를 사용하여 많이 수행되었으나 본 연구에서는 저비용의 8비트 AVR-ATmega128를 이용하여 좀 더 우수한 스윙 업 성능을 가질 수 있었다.
A study to develop a linear quadratic controller for a ship central cooling system
전태열 한국마린엔지니어링학회 2023 한국마린엔지니어링학회지 Vol.47 No.5
In this study, a linear quadratic (LQ) controller was developed and applied to maintain the desired freshwater outlet temper-ature, efficiently operate the seawater (SW) pump rotational speed, and effectively regulate the three-way valve opening in response to step disturbances. A mathematical model of the central cooling system was established to integrate the two controllers. The state-space equation of the mathematical model was linearized to facilitate controller development. The voltage frequency of the SW pump motor and three-way valve opening degree were selected as the two primary inputs of the system control. In contrast, the heat exchanger (HEX) and three-way valve outlet temperatures were the primary outputs of the control system. To design the LQ controller, the input control vector that minimized the performance index by incorporating specific weighting matrices was determined. The resulting LQ controller with an integrator was developed and tested through control performance simulations. The simulation results revealed that the proposed controller controlled the freshwater outlet temperature with minimal overshoot, efficiently controlled the SW pump rota-tional speed, and effectively controlled the three-way valve opening against step disturbances. The proposed LQ controller for central cooling systems offers a refined approach for efficiently controlling ship central cooling systems.
유성종,전태열,성영은,Yoo, Sung-Jong,Jeon, Tae-Yeol,Sung, Yung-Eun 한국전기화학회 2009 한국전기화학회지 Vol.12 No.1
연료전지는 가까운 미래를 위한 핵심 청정 신에너지원 중의 하나로 기대된다. 그러나 고분자 연료전지에서 공기극은 느린 산소환원반응과 많은 백금 사용 때문에 상업화에 어려움을 겪고 있으며, 이것을 해결하는 것이 최근 당면 과제이다. 또한 연료극은 일산화탄소의 피독 현상과 전극의 안정성이 문제시 되고 있다. 본 총설에서는 고분자 연료전지를 위한 연료극, 공기극 전기화학 촉매의 이론적 접근을 통해 촉매를 설계하는 최근 연구 내용을 소개하려 한다. 촉매 설계는 합금 전기 화학 촉매를 통해 접근 했으며, 이는 electronic, geometric, lateral effects를 손쉽게 조절할 수 있게 한다. 이것은 계산되어진 d-band center의 함수에 의존하며, 촉매의 활성과 큰 관계를 가짐을 발견하였다. 본고에서 지향하는 촉매의 최종 방향은 이론적 접근을 통해서 촉매의 사용량을 줄이면서 효율적으로 사용하는 것이다. Fuel cells are expected to be one of the major clean new energy sources in the near future. However, the slow kinetics of electrocatalytic hydrogen oxidation reaction (HOR) and oxygen reduction reaction (ORR), and the high loading of Pt for the anode and cathode material are the urgent issues to be addressed since they determine the efficiency and the cost of this energy source. In this review paper, a new approach was developed for designing electrocatalysts for the HOR and ORR in fuel cells. It was found that the electronic properties of Pt could be fine-tuned by the electronic and geometric effects introduced by the substrate alloy metal and the lateral effects of the neighboring metal atoms. The role of substrate was found reflected in a volcano plot for the HOR and ORR as a function of their calculated d-band centers. This paper demonstrated a viable way to designing the electrocatalysts which could successfully alleviate two issue facing the commercializing of the fuel cell-the cost of electrocatalysts and their efficiency.
안티몬 도핑된 주석 산화물에 담지된 백금 촉매의 에탄올 산화 반응 및 안정성 연구
이국승,박희영,전태열,성영은,Lee, Kug-Seung,Park, Hee-Young,Jeon, Tae-Yeol,Sung, Yung-Eun 한국전기화학회 2008 한국전기화학회지 Vol.11 No.3
Electrocatalytic activities and stabilities of Pt supported on Sb-doped $SnO_2$ (ATO) were examined for ethanol oxidation reactions. Pt colloidal particles were deposited on ATO nanoparticles (Pt/ATO) and the prepared electrocatalysts were characterized by X-ray diffraction, transmission electron microscopy (TEM), and cyclic voltammetry. Electrochemical activity of the Pt/ATO for ethanol electro-oxidation was compared to those of Pt supported on carbon (Pt/C) and commercial PtRu/C. The activitiy of the Pt/ATO was much higher than those of the Pt/C and commercial PtRu/C. The Pt/ATO exhibited much higher electrochemical stabilities than the Pt/C in 0.5M ${H_2}{SO_4}$ and in 0.5M ${H_2}{SO_4}$/1M ${C_2}{H_5}OH$. According to TEM, the growth rate of Pt particles was lower in the Pt/ATO than it was in the Pt/C. The ATO nanoparticle appears to be a promising support material that promotes electrochemical reactions and stabilizes catalyst particles in direct ethanol fuel cell. 안티몬 도핑된 주석 산화물(ATO)에 담지된 백금 촉매(Pt/ATO)의 에탄올 산화반응에 대한 활성과 전기화학적 안정성을 평가하였다. Pt 콜로이드 입자를 ATO 입자에 담지하여 Pt/ATO 촉매를 제조하였으며, 제조된 촉매는 X-ray diffraction, transmission electron microscopy (TEM), 그리고 cyclic voltammetry를 이용하여 평가하였다. Pt/ATO 촉매의 에탄올 산화 활성은 Pt/C, PtRu/C에 비해 크게 우수하였다. Pt/ATO 촉매의 전기화학적 안정성 또한 Pt/C에 비해 우수하였으며, TEM 사진을 통하여 확인한 결과 Pt/ATO의 안정성은 Pt입자의 성장 속도가 Pt/C에 비해 느리기 때문인 것으로 확인되었다. 위의 결과로부터 ATO 나노입자가 직접 에탄올 연료전지용 담지체로서, 활성 및 안정성 향상을 기대할 수 있는 물질임을 확인하였다.