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제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 A new approach to synthesize composition-controlled PtPd alloy nanocatalysts supported on graphene and their enhanced electrocatalytic peformances

2016년 8월 31일 17시 07분 46초
MAT.P-618 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 14일 (금요일) 11:00~12:30
저자 및
예성지, 김영윤, 박오옥*
KAIST 생명화학공학과, Korea
Uniformly dispersed PtPd alloy nanocatalysts supported on graphene are one of the prospective electrocatalysts in methanol oxidation reaction. Here, we report a new and simple approach for synthesizing uniformly dispersed PtPd alloy nanocatalysts supported on graphene nanoplatelets (GNPs) (PtPd-GNPs) by introducing bifunctional material which can be used to modify the GNP surface and simultaneously reduce metal ions. As bifunctional materials, poly(4-styrenesulfonic acid) (PSS), poly(vinyl pyrrollidone) (PVP) and Nafion could be used and the synthesis steps were minimized comparing to previous reports thanks to their dual roles. The as-prepared nanocatalysts on GNP clearly exhibit a PtPd alloy structure with uniform size around 2 nm and strongly anchored with well-distributed states. Moreover, the Pt/Pd atomic ratio and loading density of PtPd-GNPs can also be easily controlled by changing the feed ratio between metal precursors and by changing the mass ratio of GNP to metal precursor, respectively. The readily prepared PtPd-GNPs shows composition-dependent electrocatalytic activity and stability in methanol electrooxidation reaction. Especially, PtPd-GNP with 60 at. % of Pt exhibits the highest electrocatalytic activity and stability among the samples, which is also much higher than monometallic Pt-GNP.