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이명재,신희종,강윤식,정동영,박수빈,성영은 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A fuel cell is an electrochemical energy conversion device that functions by harnessing the chemical energy released from chemical reactions occurring at the anode and cathode and converting it into electrical energy. One kind of fuel Cell, Direct Ethanol Fuel Cell has several benefits, such as stable fuel storage, high molecular energy density, low operation temperature and environmental friendliness. But there is problem that a large amount of noble metal catalyst is required to overcome extremely slow kinetics of ethanol electrooxidation and obstacles of C-C bond breaking. In this study, PtRhSn/C electrocatalysts were synthesized by conventional polyol method and were treated by thermal annealing at different gas atmospheres. These processes significantly affected the structure and oxidation state of noble metal-based electrocatalysts. The enhancements of these modifications were confirmed by X-ray diffraction, Transmission Electron Microscopy and various electrochemical measurements.
이명재,강윤식,정동영,( Stanfield Lee ),성영은 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
A fuel cell is an electrochemical energy conversion device that functions by harnessing the chemical energy released from chemical reactions occurring at the anode and cathode and converting it into electrical energy. Currently, ways to reduce or eliminate the use of platinum in fuel cells remain a popular area of research because the high cost of platinum is preventing commercialization. Also, electrolyzing mode of PEMFC to electrically dissociate water to fuel has been required for unitized regenerative fuel cell (URFC) for use in spaceships or satellites. Our work focused on enhancing the activity of platinum used by creating a platinum shell on iridium-cobalt alloyed core. The decision to use iridium-cobalt alloyed core was used instead of conventional metal core supports was made with the idea that too strong interaction between platinum and iridium may be altered by iridium-cobalt core, improving its oxygen reduction activity and oxygen evolution activity.
김민형,정동영,강윤식,이명재,신희종,김미주,박수빈,성영은 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Fuel cell has been regarded as one of the most attractive future energy conversion device due to its energy efficient and environmentally friendly properties. However, the price of fuel cell device is extremely high because the precious metal, such as platinum, has been used as essential part of fuel cell catalysts. Therefore, many researchers have investigated the synthesis of non-precious-metal catalysts (NPMCs) for replacing the platinum-based catalysts. In this study, we synthesized metal-nitrogen- carbon (M-N-C) NPMC by pyrolysing the mixture of metal, nitrogen and carbon precursors with various heat-treatment times and compared the oxygen-reduction-reaction (ORR) activity of each catalyst. From this, we wanted to verify the effect of pyrolysis-duration on catalyst synthesis process.
( Stanfield Youngwon Lee ),( Christopher Bielawski ),정동영,강윤식,이명재,신희종,김미주,성영은 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Our work focused on determining if this outer Helmholtz plane reaction does indeedexist and play a significant role in non-precious metal catalysts. A three electrode half-cell was used tomeasure the oxygen reduction reaction activity of a non-precious metal catalystin different alkaline electrolytes. Using electrolytes with different cations altered the hydration energyas well as block or increase access of oxygen to the outer Helmholtzplane. Correlations between hydrationshell size and catalytic activity were observed.