Mn組成比가 PEMFC用 Pt/C 電極觸媒 特性에 미치는 影響에 關한 硏究
Effects of PtMn composition on carbon supported PtMn catalysts for PEMFC
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기존 Pt/C 전극촉매 제조시 사용되는 Pt를 일정량의 Mn으로 대체하여 PtMn/C 전극촉매를 제조하였다. 환원제로 포름알데히드(HCHO)를 사용하여 화학환원법으로 Pt_10/C, Pt_9Mn_1/C, Pt_7Mn_3/C 촉매를 제조하였으며 반쪽 전지(half cell)에서 순환전압전류와 대 시간 전류를 측정하였다. Pt_9Mn_1/C촉매가 Pt_10/C, Pt_7Mn_3/C촉매보다 높은 산소환원반응(oxygen reduction reaction)을 보였으며 0.9, 0.8, 0.7, 0.6V에서 각각 5분동안 측정한 대 시간 전류측정에서 Pt_9Mn_1/C가 Pt_10/C, Pt_7Mn_3/C촉매보다 높은 활성을 나타냈다. 물리적 특성은 XRD, TEM분석을 통하여 알아보았으며 입자의 평균 크기는 Pt_9Mn_1/C, Pt_10/C가 각각 2.7 nm, 3 nm를 나타냈다. XRD분석을 통하여 Pt의 FCC(Face Centered Cubic)결정 구조를 확인할 수 있었다.
Abstract
Pt_10/C, Pt_9Mn_1/C, Pt_7Mn_3/C electrocatalysts for Polymer Electrolyte Membrane Fuel Cells(PEMFCs) were synthesized by reduction with HCHO and their activity as a oxygen reduction reaction(ORR) was examined at half cell. The electrochemical oxygen reduction reaction(ORR) was studied by using a glaasy carbon electrode through cyclic voltammetric curves(CV) in a 1 M H2SO4 solution. The ORR activities of Pt_9Mn_1/C were higher than Pt_10/C, Pt_7Mn_3/C. Also potential-current curves of Pt_9Mn_1/C at 0.9, 0.8, 0.7, 0.6V for 5minutes respectively were higher than Pt_10/C, Pt_7Mn_3/C. Physical characterization was made by using x-ray diffraction(XRD) and transmission electron microscope(TEM). The TEM images of Pt_9Mn_1/C, Pt_10/C catalysts showed homogenous particle distribution with particle size of about 2.7 nm, 3 nm respectively and then the XRD results showed that the crystalline structure of the synthesized catalysts are seen FCC structure.
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