CONSIDERAÇÕES TÉCNICAS QUANTO AO USO DA VOLTAMETRIA DE VARREDURA ESCALONADA EM PROCESSOS ADSORTIVOS

Cyclic voltammetry has become one of the most useful tools in modern electrochemistry, but the use of digital potentiostats should be treated with caution by users. Staircase Voltammetry utilizes some parameters to build up the potential ramp. However, for some electrochemical processes, the signal...

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Published inQuímica Nova Vol. 38; no. 3; pp. 431 - 435
Main Authors Khallil Hassan Ahmad Ali Fernandes, João Paulo Tenório da Silva Santos, Vinicius Del Colle, Janaina Souza‑Garcia, Camilo Andrea Angelucci
Format Journal Article
LanguageEnglish
Published Sociedade Brasileira de Química 01.03.2015
Subjects
analogic signal
digital signal
hydrogen adsorption
staircase sweep voltammetry
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Summary:Cyclic voltammetry has become one of the most useful tools in modern electrochemistry, but the use of digital potentiostats should be treated with caution by users. Staircase Voltammetry utilizes some parameters to build up the potential ramp. However, for some electrochemical processes, the signal response can be different compared with that acquired using true linear sweep (analogic signal). In this work, the role of SCV parameters in current response during the hydrogen electrochemical adsorption/desorption reaction on a platinum surface was studied. In addition, the transient current in each step comprising the ramp was investigated. The results showed that with a step height of 2 mV, the SCV response matches that recorded by linear sweep voltammetry. From the transient current study, two kinds of capacity were identified: non-faradaic and faradaic charge.
ISSN:1678-7064
DOI:10.5935/0100-4042.20140317