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( 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.
Lee, Stanfield Youngwon,Chung, Dong Young,Lee, Myeong Jae,Kang, Yun Sik,Shin, Heejong,Kim, Mi-Ju,Bielawski, Christopher W.,Sung, Yung-Eun American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.43
<P>This study was focused On elucidating the origin of the catalytic activity displayed by non-precious-metal-based, oxygen reduction reaction (ORR) catalysts before and after heat treatment. Electrochemical measurements were recorded using a series of metal phthalocyanines calculated to exhibit varying oxygen adsorption energies before and after heat treatment at a temperature Sufficiently high to facilitate degradation. Collectively, the results indicate that while the oxygen adsorption is germane to the catalytic activity before heat, treatment, the ORR appears to proceed through. a different pathway that is not dependent on adsorption energy after heat treatment. These conclusions help to explain the high catalytic activities exhibited by carbon- or nitrogen-based materials containing metal ions after heat treatment and may lead to the realization of substitutes for ORB. catalysts that utilize precious transition metals.</P>
김미주,강윤식,이명재,( Stanfield Youngwon Lee ),신희종,성영은 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Polymer electrolyte membrane fuel cells (PEMFC) are a sort of electrochemical devices that exerts the conversion of chemical energy into electrical energy under low operating temperatures. Due to the sluggish oxygen reduction reaction (ORR) in PEMFC, oxygen electrode catalysts that lower the overpotential are of significant importance. To reduce the usage of Pt, well known to be the best ORR catalyst but extremely expensive, research continues to be done to develop Pt-based catalysts that have been treated to create a Pt enriched surface. Herein we synthesized carbon supported Platinum-Cobalt nanoparticles and conducted acid and heat treatments to provide evidence of improved ORR activity due to a Pt rich surface structure. Physical and electrochemical characterizations were determined using tools such as X-ray diffraction, cyclic voltammetry (CV), and X-ray photoelectron spectroscopy (XPS).