| Texto completo | |
| Autor(es): |
Sahin, Nihat
[1, 2]
;
Silva, Wanderson O.
[1]
;
Camilo, Mariana R.
[1]
;
Ticianelli, Edson A.
[1]
;
Lima, Fabio H. B.
[1]
;
Parmentier, Julien
[3]
;
Comminges, Clement
[2]
;
Napporn, Teko W.
[2]
;
Kokoh, Kouakou B.
[2]
Número total de Autores: 9
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Chem Sao Carlos, Ave Trab Sao Carlense 400, CP 780, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Poitiers, Inst Chim Milieux & Mat Poitiers, 4 Rue Michel Brunet, B27, TSA 51106, F-86073 Poitiers 09 - France
[3] Univ Haute Alsace, Inst Sci Mat Mulhouse, Univ Strasbourg, CNRS, UMR 7361, 15 Rue Jean Starcky, BP 2488, F-68057 Mulhouse - France
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SUSTAINABLE ENERGY & FUELS; v. 4, n. 12, p. 6045-6053, DEC 1 2020. |
| Citações Web of Science: | 1 |
| Resumo | |
The electrochemical carbon dioxide reduction reaction (CO2RR) process can allow the production of chemicals under ambient conditions on nanostructured copper materials. However, the reaction selectivity is still a main drawback due to strong competition reactions at close electrode potentials. Herein, we introduced a novel three-dimensional electrode composed of mesoporous carbon-embedded copper nanoparticles that are capable of selectively producing formic acid and short-chain hydrocarbons at low overpotentials. The mesoporous electrocatalyst was synthesized from a facile and one-pot green chemistry process using bio-sourced Tannin mimosa (polymeric flavonoids) acting as both reducing agent and carbon precursor. The role of different electrode potentials on the product selectivity (methane and ethylene) was probed by on-line differential electrochemical mass spectrometry (DEMS). During the CO2 electrolysis, chronoamperometry experiments allowed the evaluation of the electrocatalytic performance towards CO2RR with a distinguishable production of formic acid and hydrocarbons. It should be noted that methane was first detected at a potential of -0.52 V, while ethylene showed up at -0.72 V vs. RHE. Moreover, the thin-layer Cu/C ex-tannin porous electrode surface exhibited current densities ranging from 5.9 to 42.1 mA cm(-2), which are higher than those previously reported on copper-based electrodes. This suggests that the Cu/C ex-tannin electrocatalyst surface facilitates charge and mass transfers towards accessible active sites through mesostructured carbon paths, boosting the performance for CO2RR. The Cu/C ex-tannin electrode described here may provide a promising lead for the development of effective electrocatalyst structures for scalable electrochemical CO2 reduction electrolyzers. (AU) | |
| 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 |
| Processo FAPESP: | 14/26699-3 - Desenvolvimento de eletrocatalisadores para a eletrorredução de CO2 e foto-eletrooxidação da água: investigação dos produtos reacionais por espectrometria de massas on-line em fluxo |
| Beneficiário: | Mariana Romano Camilo Casale |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 16/13323-0 - Eletroquímica do Dióxido de Carbono e da Água: Aplicação em Estocagem e Aproveitamento de Energia |
| Beneficiário: | Fabio Henrique Barros de Lima |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |