Enhanced CO₂ electrolysis with synergistic doping in perovskite cathode materials

Abstract

Traditional metal and cermet cathodes are easily oxidized when performing CO2 electrolysis without flowing reducing gas, resulting in the degradation of electrolysis performance. Ceramic cathode would demonstrate the durable performance...

Enhanced CO2 electrolysis with in situ exsolved nanoparticles in the perovskite cathode

“…Therefore, the SOEC is widely considered to be the most suitable option for the electrocatalytic conversion of CO 2 . [5][6][7] Fig. 1 shows the principle of the SOEC high-temperature electrolysis CO 2 reaction.…”

“…At present, the electrolytic performance of SOECs is mainly limited by the lack of stable and highly electrocatalytically active cathode materials. 5,[8][9][10] The Ni-YSZ cermet cathode is a widely used cathode material due to its low cost and high electrocatalytic activity. However, the Ni-YSZ cermet cathode has poor stability at high temperatures.…”

In situ exsolved CoFe alloys over perovskite toward enhanced ammonia synthesis

“…[25][26][27] Consequently, we selected the perovskite oxides La 0.6 Sr 0.4 Co 0.2 Fe 0.8+x O 3Àd as a cathode catalytic material, which is considered to be the most promising cathode material for the electrocatalytic NRR synthesis of NH 3 on account of its high catalytic activity, electrical conductivity, and good proton conduction, especially under thermal reduction, where the B-site Co and Fe elements are easily reduced to CoFe alloy NPs and an active metal oxide interface is constructed on the surface of the substrate. 28,29 Here, we synthesized a series of perovskites La 0.6 Sr 0.4 Co 0.2 -Fe 0.8+x O 3Àd (x = 0, 0.025, 0.05, 0.075, and 0.1) as PCEC electrode materials, which were mainly over-doped in the content of Fe on the B-site and reduced LSCF electrode materials, which induced the precipitation of Co and Fe metal particles on the surface and the formation of CoFe alloy. The formation of abundant oxygen vacancies can effectively promote proton transport, activate the dissociation of NRN bonds and provide active sites for adsorption of N 2 .…”

Enhanced CO2electrolysis through modulation of oxygen vacancies

“…22,23 It has been reported that doping certain metal ions into the B site of perovskite electrodes can promote the generation of abundant oxygen vacancies on the perovskite surface, which is beneficial to improve the catalytic activity of cathode materials. 24 Therefore, in this study, we aim to obtain high-performance cathode materials by optimizing the doping ratios of Cr and Fe on the B sites of the perovskite material La 0.6 Sr 0.4 Cr 1− x Fe x O 3− δ (LSCF).…”