缺氧层状双钙钛矿作为使用固体氧化物导体进行二氧化碳电解的活性阴极。
Oxygen deficient layered double perovskite as an active cathode for CO2 electrolysis using a solid oxide conductor.
作者信息
Shin Tae Ho, Myung Jae-Ha, Verbraeken Maarten, Kim Guntae, Irvine John T S
机构信息
School of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST, Scotland, UK.
Dept. of Chemical and Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Korea.
出版信息
Faraday Discuss. 2015;182:227-39. doi: 10.1039/c5fd00025d.
A-site ordered PrBaMn2O(5+δ) was investigated as a potential cathode for CO2 electrolysis using a La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O3 (LSGM) electrolyte. The A-site ordered layered double perovskite, PrBaMn2O(5+δ), was found to enhance electrocatalytic activity for CO2 reduction on the cathode side since it supports mixed valent transition metal cations such as Mn, which could provide high electrical conductivity and maintain a large oxygen vacancy content, contributing to fast oxygen ion diffusion. It was found that during the oxidation of the reduced PrBaMn2O(5+δ) (O5 phase) to PrBaMn2O(6-δ) (O6 phase), a reversible oxygen switchover in the lattice takes place. In addition, here the successful CO2 electrolysis was measured in LSGM electrolyte with this novel oxide electrode. It was found that this PrBaMn2O(5+δ), layered perovskite cathode exhibits a performance with a current density of 0.85 A cm(-2) at 1.5 V and 850 °C and the electrochemical properties were also evaluated by impedance spectroscopy.
采用La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O3（LSGM）电解质，对A位有序的PrBaMn2O(5+δ)作为二氧化碳电解的潜在阴极进行了研究。发现A位有序层状双钙钛矿PrBaMn2O(5+δ)可增强阴极侧二氧化碳还原的电催化活性，因为它支持诸如Mn等混合价态过渡金属阳离子，这可以提供高电导率并保持大量氧空位，有助于快速氧离子扩散。研究发现，在还原的PrBaMn2O(5+δ)（O5相）氧化为PrBaMn2O(6-δ)（O6相）的过程中，晶格中发生了可逆的氧切换。此外，在此用这种新型氧化物电极在LSGM电解质中成功测量了二氧化碳电解。研究发现，这种PrBaMn2O(5+δ)层状钙钛矿阴极在1.5 V和850°C下表现出电流密度为0.85 A cm(-2)的性能，并且还通过阻抗谱对其电化学性能进行了评估。
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