A redox-stable chromate cathode decorated with in situ grown nickel nanocatalyst for efficient carbon dioxide electrolysis

作者：Ruan, Cong^*; Xie, Kui

来源：Catalysis Science & Technology, 2015, 5(3): 1929-1940.

DOI：10.1039/c4cy01254b

• Current efficiency
• Electrocatalytic activity
• Electrode performance
• Electrode polarization resistances
• Electrolysis cell
• Nickel nanoparticles
• SEM and EDS analysis
• Solid oxide electrolyzer

The redox-stable La0.75Sr0.25Cr0.5Mn0.5O3-delta (LSCM) ceramic can be utilized as a solid oxide electrolyzer cathode for direct carbon dioxide electrolysis; nevertheless, the insufficient electro-catalytic activity of ceramic LSCM restricts the electrode performance and current efficiency. In this paper, catalytically active nickel nanoparticles are anchored on the surface of an LSCM substrate through an in situ growth process to improve the electrode performance. The combination of XRD, TEM, XPS, SEM and EDS analyses demonstrate the reversible in situ growth of the nickel catalyst by transforming A-site deficient and B-site rich (La0.75Sr0.25)(0.9)(Cr0.5Mn0.5)(0.9)Ni0.1O3-delta (LSCMN) into LSCM and nickel in redox cycles. The conductivities of LSCM and LSCMN are investigated and correlated with electrode performance in symmetrical cells and electrolysis cells. A significant improvement in electrode polarization resistance is observed for the LSCMN cathode. The current efficiency is considerably improved by 30% for LSCMN in contrast to the bare LSCM cathode for direct carbon dioxide electrolysis at 800 degrees C.

• 出版日期2015-3-1
• 单位合肥工业大学