Developments in CO₂ Electrolysis of Solid Oxide Electrolysis Cell with Different Cathodes▴

Abstract

Solid oxide electrolysis cell (SOEC) is a device that can efficiently convert excessive power of renewable energy, such as wind or solar energy into chemical energy. High temperature CO 2 electrolysis based on solid oxide electrolysis cell has been proved as an effective method to produce sustainable fuels and reduce greenhouse emissions. The performance of cathodes as the place where the electrolysis reaction takes place for fuel gas affects the efficiency of SOEC, whereas traditional cathodes show relatively low catalytic activity towards CO 2 electrolysis. In recent years, in addition to the optimization of traditional Ni-based cathodes, the research on perovskite cathodes with better redox stability has been carried out rapidly. In this paper, the development of different cathodes of solid oxide electrolysis cell used for CO 2 electrolysis is summarized, from the study of new materials with different doping ratios for CO 2 electrolysis, to the microstructure optimization of electrode. It was found, that both durability and catalytic activity for the cathode materials could significantly improve the performance of single cells of SOEC. Finally, more prospects for future research work are put forward.

Perovskite Oxyfluoride Ceramic with In Situ Exsolved Ni–Fe Nanoparticles for Direct CO2 Electrolysis in Solid Oxide Electrolysis Cells

“…Solid oxide electrolysis cell (SOEC) is one of the most promising techniques to achieve carbon neutrality, featured with using renewable energies and efficient conversion of CO 2 greenhouse gas into valuable chemicals and fuels. , The CO 2 electroreduction reaction takes place at the cathode, which often consists of nickel (Ni) and Y 2 O 3 -stabilized ZrO 2 (YSZ) ceramic. Although Ni–YSZ cermet is highly active for the CO 2 reduction reaction (CO 2 RR), , unfortunately, Ni–YSZ cermet cathodes are extremely susceptible to carbon deposition, Ni agglomeration, and oxidation under typical operating conditions . To avoid these problems, ceramic materials with mixed oxygen ionic and electronic conductivities are extensively investigated as alternative cathodes for CO 2 RR.…”

The facilitated cathodic elementary reactions of solid oxide electrolysis cells for CO2 conversion over a Ce decorated La0.43Ca0.37Ti0.94Ni0.06O3−δ electrocatalyst

“…To address the global warming caused by CO 2 emission, researchers are striving to develop efficient technology to convert CO 2 into CO fuel and achieve a carbon neutral cycle. 1 Among various CO 2 conversion strategies via thermocatalytic, photocatalytic and electrocatalytic pathways, solid oxide electrolysis cells (SOECs) have attracted extensive interest because of the unrivaled efficiency and ease of operation. 2,3 The representative high temperature CO 2 electrolysis in a SOEC (denoted as CO 2 -SOEC) produces CO at the cathode side and pure O 2 at the anode side, respectively.…”

A Review on Perovskite-Type LaFeO3 Based Electrodes for CO2 Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

“…Mixed ionic and electronic conductors (MIECs) are being developed to replace the Ni-YSZ electrode. These MIEC materials demonstrate high catalytic activity, redox stability, and sulfur tolerance compared to Ni-YSZ. , Furthermore, several MIECs have demonstrated high stability in CO 2 /CO at an elevated temperature. − in which the entire surface is electrochemically active leading to a significant performance improvement, unlike cermet electrodes, due to MIEC–gas interface activity (dual-phase-boundary, DPB). Fluorite-type Ce 0.9 Gd 0.1 O 2−δ , perovskite-type LaFeO 3 , La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3−δ , double perovskite-type Sr 2 MgMoO 6 , and Nd 2 WO 6 oxides are reported as potential electrodes for SOCs. − Among these families of MIECs, doped lanthanum ferrites were recently developed as SOEC cathodes due to their good catalytic activity, electronic conductivity, and oxygen mobility. − Since perovskite-type structure oxides are currently being widely explored, this article is aimed to provide an overview of LaFeO 3 electrodes for SOECs.…”