Reactivity of 3-carbon-atom chain alcohols on gold electrode: A comparison to understand the glycerol electro-oxidation

Autor(es)

de Souza, Nyccolas Emanuel ^[1] ; Gomes, Janaina Fernandes ^[2] ; Tremiliosi-Filho, Germano ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Chem Sao Carlos IQSC, POB 780, BR-13560970 Sao Carlos, SP - Brazil

^[2] Fed Univ Sao Carlos Ufscar, Chem Engn Dept, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 800, p. 106-113, SEP 1 2017.
• Citações Web of Science: 9

Resumo

In this work, the electro-oxidation of glycerol was compared with those of similar 3-carbon-atom chain alcohols, namely 1-propanol, 2-propanol, propane-1,2-diol and propane-1,3-diol, in order to further understand the reactivity of glycerol on gold in alkaline environment. The corresponding products formation was monitored by in situ FTIR spectroscopy. The reactivity of the investigated alcohols on gold in alkaline medium decreased in the following order: glycerol > propane-1,2-diol >> propane-1,3-diol > 2-propanol approximate to 1-propanol. For glycerol and propane1,2-diol, the products distribution provided by in situ FTIR spectroscopy showed indications of high C-C bond breaking rates, as evidenced by the presence of products with 1 and 2 carbon-atom chain. On the other hand, the electrochemical oxidation of propane-1,3-diol, 2-propanol and 1-propanol led only to products with 3-carbon-atom chain. Based on these evidences, it was stated that the presence of vicinal OH groups in the alcohol molecule may be a key feature for the C-C bond breaking in alkaline medium, leading to the generation of further oxidized products that, in turns, yield more electrons per alcohol molecule and consequently higher current densities. Additionally, electrochemical measurements were also performed in acidic and neutral media for comparison. Under these conditions, the alcohols exhibited much lower current densities compared to those in alkaline medium. This was explained by the lack of alkoxide formation (active species in alkaline medium) and the blockage of the surface by ClO4- anions. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/08511-9 - Estudo do mecanismo da reação de eletro-oxidação do glicerol sobre catalisadores modelo em diferentes ambientes eletroquímicos por voltametria cíclica e técnicas espectroscópicas
• Beneficiário: Janaina Fernandes Gomes
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/16930-7 - Eletrocatálise V: processos eletrocatalíticos de interconversão entre as energias química e elétrica
• Beneficiário: Edson Antonio Ticianelli
• Modalidade de apoio: Auxílio à Pesquisa - Temático