Efficient electrocatalytic oxidation of water: minimization of catalyst loading by an electrostatic assembly of hydrous iridium oxide colloids
Resource
RSC ADVANCES, 2(10), 4092-4096
Journal
RSC Advances
Journal Volume
2
Journal Issue
10
Pages
4092
ISSN
2046-2069
Date Issued
2012-03-16
Date
2012
Author(s)
Min-Chieh Chuang
Abstract
Exploiting an effective catalyst has been an essential and significant task in the development of electrochemical water oxidation. A highly electrocatalytic iridium oxide colloidal electrode, prepared by the electrostatic assembly fashion, is reported herein. Poly(allylamine hydrochloride) (PAH) was utilized to facilitate the formation of stable PAH/iridium oxide colloid clusters, resulting in a high catalytic utility (turnover efficiency of 6.36 ± 0.25 s -1 at low overpotential, η = 0.28 V) towards the oxygen evolution reaction (OER), with the smallest Ir loading (Γ cov = 2.3 × 10 -9 mol cm -2) of any yet reported. A variety of examinations and approaches were conducted to gain better understanding of such electrostatically assembled architecture and to identify hexahydroxyiridate(iv), [Ir(OH) 6] 2-, as the key active catalytic species.
SDGs
Publisher
Royal Society of Chemistry
Type
journal article
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