전기화학적 석출을 통해 ITO 표면에 형성한 덴드라이트백금 구조의 전기화학적 촉매 활성
Electrocatalytic Activity of Dendritic Platinum Structures Electrodeposited on ITO Electrode Surfaces
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전기화학적 석출 방법을 이용하여 indium tin oxide 표면에 백금 나노구조를 형성하고 총 석출전하량을 조절하여 형성되는 나노구조의 변화에 따른 전기화학적 메탄올 산화 반응과 산소 환원반응에 대한 촉매 활성의 변화를 관찰하였다. 석출 전하량의 변화에 따라 생성되는 백금 나노구조체 표면의 특성을 주사 전자 현미경, 전기화학적 표면적 측정, X-선 회절법, 일산화탄소 벗김분석을 통해 규명하고 전기화학적 촉매 활성과의 연계성을 조사하였다. 전기화학적 촉매 활성은형성된 백금 나노구조에 따라 달라지는데, 석출 전하량 0.45 C cm−2에 해당하는 백금 나노구조에서 가장 우수한 촉매 활성이 관찰되었다. 전하량에 따른 표면적의 변화보다 형성된 구조적 특이성과 결정면이 촉매 활성에 많은 영향을 미쳤다. 세밀한 백금 나노구조의 변화에 따른 전기화학적 촉매 활성 변화에 관한 본 연구결과는 보다 우수한 촉매 시스템을 고안하는 연구에 도움이될 것이다.
Abstract
Abstract :We report on the electrocatalytic activities at Pt nanostructure surfaces electrodepositedwith different deposition charges on indium tin oxide electrodes for oxygen reductionand methanol oxidation reactions. The surface properties of Pt nanostructures depending ondeposition charges were characterized by scanning electron microscopy, electrochemical surfacearea measurement, X-ray diffraction, and CO stripping analysis, which were correlatedto the electrocatalytic activities. Pt nanostructures with deposition charge of 0.03 C exhibitedthe highest electrocatalytic activity for oxygen reduction and methanol oxidation. The sharpsites of Pt nanostructure and the presence of highly active facet play a key role, whereasthe electrochemical surface area does not significantly affect the electrocatalytic activity. Theresults obtained in this work with regard to the dependence of electrocatalytic activity onthe variation of the Pt nanostructures will give insights into the development of advancedelectrocatalytic systems.
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