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CO2 Reduction Mechanism on the Pb(111) Surface: Effect of Solvent and Cations

Author:
Zhao, Chen Xu, Bu, Yi Fan, Gao, Wang, Jiang, Qing
Source:
The Journal of Physical Chemistry C 2017 v.121 no.36 pp. 19767-19773
ISSN:
1932-7455
Subject:
carbon dioxide, catalysts, cations, electrodes, formic acid, gases, hydrophilicity, hydrophobicity, lead, methodology, physical chemistry, reaction mechanisms, selectivity (chemistry), solvents
Abstract:
The Pb electrode is the most efficient and selective catalyst in reducing CO₂ into HCOOH; however, the reaction mechanism remains elusive. Herein, we have investigated the mechanism of CO₂ electroreduction to HCOOH on the Pb(111) surface using density functional theory calculations. We find that the effects of solvation and cations lead to different active intermediates for CO₂ electroreduction (HCOO in gas-phase condition, both HCOO and COOH in solvent condition, and COOH in cation solution). In particular, the size and hydrophilic/hydrophobic nature of the cations are found to significantly affect the reaction selectivity and efficiency of CO₂ electroreduction at different overpotentials. These findings rationalize several experimental observations and contribute to a thorough understanding of CO₂ electroreduction.
Agid:
5802544