Vulcan XC-72 카본블랙을 지지체로 한 위에 염화백금산을 환원시켜 백금을 담지시켰다. 전기화학적 측정방법과 X-선 회절로 표면적 및 입자크기를 관찰하였으며 초기입자의 크기나 백금의 농도, 온도, 전극전위에 따른 입자 크기 성장의 변화를 관찰하였다. 전도성 용액 중에 용해되어 있는 백금이 재석출될 때 양극전위에서 더욱 더 석출이 용이하며 기체분위기, 즉 400℃ 수소, 질소 및 아르곤 등의 분위기에서는 표면적의 감소를 볼 수 없었다. 본 실험에서는 위와 같은 조건에서 카본에 담지된 백금 입자의 성장의 관찰과 그 원인을 고찰하였다.

Pt catalysts supported on Vulcan XC-72 carbon have been prepared with H₂PtCl₆ㆍ6H₂O as metal precursor. Measurements of surface area and crystallite siize by electrochemical method and by X-ray diffrac-tion showed that the supported platinum crystallites grew when in contact with a electroconducting solution. This study shows that the platinum area loss depends on such factors as an initial crystallite size, platinum concentration, temperature and potential of electrode. A soluble platinum in conducting solution was redepos-ited on the electrode surface at cathodic potential, but there was no detectable area losses due to heating in nitrogen, argon or hydrogen at 400℃. In this study we will present the agglomeration phenomena of platinum particles and the reason of growth of platinum particles.

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