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Alkali Cation Effect During the Oscillatory Electroreduction of H 2 O 2 on Pt
Author(s) -
da Silva Kaline N.,
Nagao Raphael,
Sitta Elton
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201702276
Subject(s) - chemistry , alkali metal , hydrogen peroxide , inorganic chemistry , adsorption , catalysis , interphase , hydrogen , molecule , drop (telecommunication) , organic chemistry , telecommunications , genetics , computer science , biology
Hydrogen Peroxide Reduction Reaction (HPRR) catalyzed by Pt was studied in alkaline media and the effect of alkali cations were analyzed by the changes on dynamic instabilities presented by this system under high ohmic drop conditions. The origin of these instabilities is the competition between OH 2 − electroreduction and hydrogen adsorption on Pt surfaces, the latter being the first step for hydrogen evolution reaction (HER). Both HER and hydrogen adsorption are cation‐dependent which suggests that noncovalent interactions are able to stabilize the water molecules favoring the Pt−H formation. Thus, in an interphase, in which the noncovalent interactions are more effective, HPRR will proceed as an indirect poisoned system, reflecting on slow frequency oscillations ( ω ), for instance ω LiOH < ω NaOH < ω KOH for several H 2 O 2 concentrations.