Issue 2, 2023

Enhanced CO2 electrolysis through modulation of oxygen vacancies

Abstract

Conventional metal and cermet cathodes are easily oxidized during CO2 electrolysis, which seriously affects the electrolysis performance of electrolysis cells. The excellent durability and low cost of ceramic cathodes make them a promising alternative electrode. However, their catalytic activity is limited. In this work, we prepared a series of perovskite materials La0.6Sr0.4Cr1−xFexO3−δ (LSC1−xFx, x = 0–1) by synergistic doping at the B site to improve the catalytic activity. Replacing Cr with Fe can increase the concentration of low-valent Fe ions linked to oxygen vacancies, which leads to an increase in oxygen vacancies and thus improves the activity of CO2 electrolysis. Among the LSC1−xFx (x = 0–1) cathode materials, the LSC0.25F0.75 sample exhibits the highest electrochemical catalytic activity with a CO production rate of 5.32 mL min−1 cm−2 at 1.6 V and 850 °C, which is about 5 times that of other LSC cathode materials. In addition, its current efficiency can reach 96.4% during electrolysis of CO2. The electrolytic performance remained stable during the high temperature test for up to 100 h, further demonstrating its excellent thermal stability.

Graphical abstract: Enhanced CO2 electrolysis through modulation of oxygen vacancies

Article information

Article type
Paper
Submitted
01 Sep 2022
Accepted
16 Nov 2022
First published
23 Nov 2022

New J. Chem., 2023,47, 603-608

Enhanced CO2 electrolysis through modulation of oxygen vacancies

L. Huang, Y. Xu, X. Huang, H. Sun, X. He and L. Gan, New J. Chem., 2023, 47, 603 DOI: 10.1039/D2NJ04357B

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