Pulsed electrochemical synthesis of formate using Pb electrodes

被引：30

作者：

Blom, Martijn J. W. ^{[1
,2
]}

Smulders, Vera ^{[1
]}

van Swaaij, Wim P. M. ^{[2
]}

Kersten, Sascha R. A. ^{[2
]}

Mul, Guido ^{[1
]}

机构：

[1] Univ Twente, Fac Sci & Technol, MESA Inst Nanotechnol, PhotoCatalyt Synth Grp, POB 217, NL-7500 AE Enschede, Netherlands

[2] Univ Twente, Fac Sci & Technol, Sustainable Proc Technol Grp, POB 217, NL-7500 AE Enschede, Netherlands

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2020年 / 268卷

关键词：

Pulsed electrochemistry; Electrochemical CO2 reduction; Formate; Deactivation; Periodic anodic polarization; CARBON-DIOXIDE; METAL-ELECTRODES; LEAD ELECTRODE; CO2; REDUCTION; FUEL-CELLS; ELECTROREDUCTION; SPECTROSCOPY; SELECTIVITY; CATALYSTS;

D O I：

10.1016/j.apcatb.2019.118420

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Lead cathodes show decreasing Faradaic Efficiency (FE) in electrochemical conversion of CO2 to formate, favoring hydrogen, within minutes of operation in KHCO3 electrolyte at -1 to -1.3 V vs RHE. Periodic anodic polarization (pulsed electrochemistry) is demonstrated to result in a high time-averaged FE towards formate. Specifically, an anodic polarization time of 0.1-1 s is sufficient to obtain a Pb-surface providing an averaged formate FE of 30-50%, when the cathodic polarization time is limited to a few seconds. A Pourbaix diagram and Raman spectra are provided, which show that PbCO3 is formed on the surface of the cathode in KHCO3 electrolyte at anodic potential (0.05 V vs RHE), which compound is likely inducing the high FE towards formate. Our method thus provides a means to operate Pb electrodes in electrochemical CO2 reduction with high stability, at a low energy penalty.

引用

页数：7

共 28 条

[1] The Electrochemical Reduction of Carbon Dioxide to Formate/Formic Acid: Engineering and Economic Feasibility [J].