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Prussian Blue Degradation during Hydrogen Peroxide Reduction: A Scanning Electrochemical Microscopy Study on the Role of the Hydroxide Ion and Hydroxyl Radical
Author(s) -
Noël JeanMarc,
Médard Jérôme,
Combellas Catherine,
Kanoufi Frédéric
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600196
Subject(s) - prussian blue , scanning electrochemical microscopy , dissolution , chemistry , hydrogen peroxide , ultramicroelectrode , electrochemistry , ferrocyanide , hydroxide , radical , scanning electron microscope , degradation (telecommunications) , inorganic chemistry , nuclear chemistry , photochemistry , electrode , cyclic voltammetry , materials science , organic chemistry , telecommunications , composite material , computer science
The degradation of Prussian blue (PB) during H 2 O 2 reduction is investigated by scanning electrochemical microscopy (SECM). Coupling SECM with optical microscopy allows quantitative assessment in situ of the effect of HO − on the dissolution of PB in lithographic experiments. The local production of HO − in the vicinity of PB is an easy way to pattern a PB layer; Such PB dissolution during H 2 O 2 reduction leads to the release of soluble ferrocyanide and Fe 2+ . In the presence of H 2 O 2 , the latter initiate the Fenton reaction and the generation of highly reactive hydroxyl radicals HO . . This is revealed by the degradation of an organic layer immobilized on an ultramicroelectrode held in the vicinity of a PB layer during H 2 O 2 reduction. The formation of such reactive species is of great importance to further understand the possible origin of the activity loss of sensors, batteries, and photovoltaic cells when composite materials based on PB or on its derivatives are used as catalysts for H 2 O 2 or O 2 reduction.