Premium
Cathodic electrochemiluminescence of Ru(bpy) 3 2+ /Nafion coated on graphite oxide electrode in purely aqueous solution
Author(s) -
Cui Hua,
Zhao XiaoYu,
Lin XiangQin
Publication year - 2003
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.724
Subject(s) - electrochemiluminescence , nafion , aqueous solution , chemistry , ruthenium , reagent , ruthenium oxide , inorganic chemistry , electrode , oxide , cathodic protection , graphite oxide , graphite , electrochemistry , catalysis , organic chemistry
Abstract Two cathodic electrochemiluminescence (ECL) peaks have been obtained at −0.99 and −1.80 V (vs. SCE), respectively, from Ru(bpy) 3 2+ /Naon coated onto a graphite oxide electrode in purely aqueous solution under cyclic voltammetric (CV) conditions, without addition of any reducing or oxidative reagents. These two ECL peaks were found to correlate to initial scan direction, pH, and reversal potential. Naon played an important role in the generation of these two ECL peaks because no cathodic emission was observed in the system without Naon. It seems that a part of Ru(bpy) 3 3+electrogenerated at positive potential can remain in the Naon, even at negative potentials. It was conrmed that Ru(bpy) + was formed at −1.80 V by addition of S 2 O 8 2− . The ECL peak at −0.99 V is attributed to the reaction of Ru(bpy) 3+ and OH − . The ECL peak at −1.80 V is probably due to the annihilation reaction of Ru(bpy) 3+ and Ru(bpy) + . Copyright © 2003 John Wiley & Sons, Ltd.