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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.)

The role of HBF4 in electro-catalysis: Arsenic contamination and anion adsorption

Full text
Author(s):
Santos, Adriano L. [1] ; Nagao, Raphael [1] ; Oliveira, Cristiane P. [1] ; de Lima, Roberto B. [2] ; Varela, Hamilton [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Chem Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed Maranhao, Dept Chem, BR-65085580 Sao Luis, MA - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 660, n. 1, p. 147-152, SEP 1 2011.
Web of Science Citations: 5
Abstract

We present in this work a comprehensive investigation of the role played by dissolved tetrafluoroboric acid on the electrochemical response of a polycrystalline platinum electrode in acidic media. HBF(4) from two different suppliers was employed and characterized in terms of the amount of arsenic contamination by Inductively Coupled Plasma-Optical Emission Spectroscopy. The effect of different amounts of HBF(4) on the voltammetric profile of the Pt vertical bar HClO(4)(aq) interface was investigated by means of electrochemical quartz crystal nanobalance (EQCN). Despite the comparable cyclic voltammograms, the presence of arsenic in one of the two HBF(4) used resulted in dramatic variations in the mass change profile, which evidences the deposition/dissolution of arsenic prior to the surface oxidation. For the arsenic-free HBF(4), its effect on the mass change profile was mainly associated to anion adsorption. The impact of dissolved HBF(4) on the electro-oxidation of formic acid was rationalized in terms of two contributions: current enhancement at low potentials due to the arsenic-assisted formic acid electro-oxidation and inhibition at high potentials due to anion adsorption. (C) 2011 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities
Grantee:Edson Antonio Ticianelli
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 09/00153-6 - Spatio-temporal self-organization in electrocatalysis
Grantee:Raphael Nagao de Sousa
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 09/16449-1 - Kinetic instabilities in electrocatalysis: mechanism and spatio-temporal dynamics
Grantee:Cristiane Pontes de Oliveira
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 07/06037-2 - Nanogravimetric study of the surface electrooxidation process of gold
Grantee:Adriano Lopes Santos
Support type: Scholarships in Brazil - Master