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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Alkali Cation Effect During the Oscillatory Electroreduction of H2O2 on Pt

Full text
Author(s):
da Silva, Kaline N. [1] ; Nagao, Raphael [2] ; Sitta, Elton [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CHEMISTRYSELECT; v. 2, n. 35, p. 11713-11716, DEC 11 2017.
Web of Science Citations: 0
Abstract

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 OH2- 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 (omega), for instance omega(LiOH) < omega(NaOH) < omega(KOH) for several H2O2 concentrations. (AU)

FAPESP's process: 17/00089-2 - Multi-user equipament approved in grant 16/01817-9: ellipso-microscopy for surface imaging
Grantee:Raphael Nagao de Sousa
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 16/01817-9 - Design and control of self-organized electrochemical patterns
Grantee:Raphael Nagao de Sousa
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
FAPESP's process: 16/14758-0 - Instabilities in electrocatalysis: complex kinetics catalyzed by model PT surfaces
Grantee:Kaline Nascimento da Silva
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 16/22262-5 - Design and control of self-organized electrochemical patterns
Grantee:Raphael Nagao de Sousa
Support Opportunities: Scholarships in Brazil - Young Researchers
FAPESP's process: 14/23916-3 - Instabilities in electrocatalysis: complex kinetics catalyzed by model Pt surfaces, Au and microelectrodes
Grantee:Elton Fabiano Sitta
Support Opportunities: Regular Research Grants