Achieving Highly Efficient Carbon Dioxide Electrolysis by in Situ Construction of the Heterostructure

Xiaoxia Yang, Wang Sun*, Minjian Ma, Chunming Xu, Rongzheng Ren, Jinshuo Qiao, Zhenhua Wang, Zesheng Li, Shuying Zhen, Kening Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

The design of active cathode catalysts, with abundant active sites and outstanding catalytic activity for CO2 electroreduction, is important to promote the development of solid oxide electrolysis cells (SOECs). Herein, A-site-deficient perovskite oxide (La0.2Sr0.8)0.9Ti0.5Mn0.4Cu0.1O3-δ (LSTMC) is synthesized and studied as a promising cathode for SOECs. Cu nanoparticles can be rapidly and uniformly in situ-exsolved under reducing conditions. The heterostructure formed by the exsoluted Cu and LSTMC provides abundant active sites for the catalytic conversion of CO2 to CO. Combined with the remarkable oxygen-ion transport capacity of the LSTMC substrate, the specially designed Cu@LSTMC cathode exhibits a dramatically improved electrochemical performance. Furthermore, first-principles calculations proposed a mechanism for the adsorption and activation of CO2 by the heterostructure. Electrochemically, the Cu@LSTMC presents a high current density of 2.82 A cm-2 at 1.8 V and 800 °C, which is about 2.5 times higher than that of LSTM (1.09A cm-2).

Original languageEnglish
Pages (from-to)20060-20069
Number of pages10
JournalACS Applied Materials and Interfaces
Volume13
Issue number17
DOIs
Publication statusPublished - 5 May 2021

Keywords

  • COadsorption
  • direct COelectrolysis
  • heterogeneous structure
  • in situ exsolution
  • solid oxide electrolysis cells

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