Myung-Keun Han

Investigation of a non-noble composite catalyst for hydrogen release control of ammonia-borane

Ammonia-borane (NH3BH3) has been investigated as hydrogen storage material for fuelcell application because of its good gravimetric (19.6 wt%) and volumetric hydrogen density. Nonnoble metals such as cobalt, nickel and copper were employed as catalyst and their combination was also tried as catalysts. For the effective scanning method for a number of compositions, a high throughput screening (HTS) test was used. Among the catalysts investigated, the ternary composite Ni60Co20/ACF (active carbon fiber) showed excellent performance in releasing the hydrogen from NH3BH3 solution, which can be recommended as a viable/suitable catalyst for fuel-cell system application, with some necessary basic improvements.

Effect of Pt Particle Size on the Durability of PEMFC

본 연구에서는 백금의 입자크기가 내구성과 활성에 미치는 영향을 고찰하였다. 상용 Pt/C의 열처리를 통해 백금 입자 크기를

Photocatalytic Application of TiO 2 for Air Cleaning

3.5{sim}9;nm

Investigation of metal alloy catalyst for hydrogen release from sodium borohydride for polymer electrolyte membrane fuel cell application

로 조절하였고, XRD와 TEM을 통해 이를 확인하였다. 촉매의 내구성 분석을 위해 가속 실험을 실시하였고, 촉매 활성 측정을 위해 산소환원반응 실험을 하였다. 백금의 입자크기를 증가시킬수록 내구성은 향상되었으나 촉매의 활성이 저하되었다. 즉 촉매의 내구성과 활성은 반비례관계가 성립된다는 것을 확인하였다. 그리고 저하된 촉매 활성과 내구성을 향상시키기 위해, 합금 촉매를 사용하였다.상용 Pt/C의 최대 전력 밀도는 약

Hydrogen generation from aqueous acid-catalyzed hydrolysis of sodium borohydride

507.6;mV/cm^2

One-pot synthesis of multifunctional mesoporous silica nanoparticle incorporated with zinc(II) phthalocyanine and iron oxide

이고, PtCo/C 합금촉매는

Characterization of Au/MnOx/TiO2 for Photocatalytic Oxidation of Carbon Monoxide

585.8;mV/cm^2

Characterization of Au/MnO x /TiO 2 for Photocatalytic Oxidation of Carbon

이었다. 전기화학적 표면적은 상용 Pt/C는 약 60%정도 감소하였고, PtCo/C 합금촉매는 약 24%정도의 감소율을 나타냈다. 따라서 백금의 입자 크기 조절과 합금화를 통해 백금의 내구성과 활성을 동시에 높일 수 있었다. 【The influence of the particle size of platinum(Pt) on the stability and activity was studied. The particle size of platinum was controlled in the range of

Generation of Hydrogen from Liquid Acid-Catalyzed NaBH4 and its Combined Operation with PEMFC

3.5{sim}9;nm

Synthesis of Mesoporous Carbon with Graphite Pore Walls for Electrochemical Application

by heat treatment of commercial Pt/C and confirmed by XRD and TEM. An accelerated degradation test was performed to evaluate the stability of platinum catalysts. Oxygen reduction reaction was monitored for the measurement of activity. As increasing the Pt particle size, the stability of Pt/C electrode was enhanced and the activity was reduced. It was confirmed that the stability of Pt/C electrode was in inverse proportion to the activity. PtCo/C alloy catalyst was used to improve the activity and stability of large-sized platinum particle. The maximum power density of commercial Pt/C was