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论文类型：期刊论文

发表时间：2009-03-01

发表刊物：ELECTROCHIMICA ACTA

收录刊物：SCIE

卷号：54

期号：8

页面范围：2224-2228

ISSN号：0013-4686

关键字：1,5-Diaminoanthraquinone; Oxygen reduction; Electron-transfer resistance; O(2)-transport; Electrocatalysis

摘要：The poly-1,5-diaminoanthraquinone (P15DAAQ) modified Pt electrodes show electrocatalytic activity for oxygen reduction reaction (ORR) with oxygen reduction peak at about 0.39V in 0.1 MH(2)SO(4). The P15DAAQ with different thickness has different morphology. The effects of morphologies on the electrocatalytic behaviors of P15DAAQ for oxygen reduction reaction are investigated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) measurements. We propose two different O(2)-transport processes on electrodes modified with thin P15DAAQ and thick P15DAAQ. Together with the quantitative analysis with O(2)-transport dynamics, electron-transfer resistance, and catalytic reaction rate during ORR, thin P15DAAQ electrode performs better electrocatalysis for ORR, although thick P15DAAQ provides higher real surface area and more reactive sites which is beneficial for ORR within a short time. (C) 2008 Elsevier Ltd. All rights reserved.