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폴리올 공정 제어에 의한 탄소기반 나노 Pt 촉매 담지 특성 평가
문채린 ( Chae Lin Moon ),배진우 ( Jin Woo Bae ),최순목 ( Soon Mok Choi ) 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.2
Nano Pt particles were dispersed on carbon-based supports by a polyol process for a catalyst application in a polymer electrolyte fuel cell. We tried to optimize the effect of pH on the electrostatic forces between the support and the Pt colloids. We investigated the relationship among the surface charges on the carbon support, the solution pH, and the concentration of a glycolate, and the Pt particle size. The produced catalyst with nano Pt particles on the support was evaluated by the long-term cyclic voltammetry (CV) performance test and compared with the results from a commercial catalyst. Our experimental results reveal that the pH-control can modify the particle size distribution and the dispersion of the nano Pt particles. This resulted in a cost-effective method for the synthesis of highly Pt loaded Pt/C catalysts for fuel cells better than a commercial catalyst system.
Woo Ho Yoon,Moon Chae Lin,Bae Jin Woo,Choi Soon-Mok,Joo Gyeong Seok,Kim Min sang,Kim Hyun-Sik 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.1
We designed sputter process parameters to produce three distinct types of n-type Bi2Te3 thin films (Ni-doped, Ti-doped, and undoped) to compare the nanostructures and the thermoelectric properties. The three films with different additive conditions (Ni-, Ti-, and undoped) resulted in different nanostructures; a connected column structure, a fibrous-grain nanostructure with void grain boundaries, and a dense columnar nanostructure, respectively. The additives were also considered to modify the carrier concentration of the films by controlling defect chemistry of the films. The amount of Te-evaporation was considered to be tuned by the different location between two additives, Ni at van der Waals bonding layer, Ti at Bi site, respectively. We tried to discuss the results using the structure zone model (SZM) and the difference of electronegativity of the additives. The maximum power factor value 400 μWK2/m was obtained from the Ni 1.12 at% doped film (Ni-11) owing to the large Seebeck coefficient and the high density (the large electronic mobility).