A scandium-doped manganate anode for a proton-conducting solid oxide steam electrolyzer. Issue 1 (23rd December 2015)

• Record Type: Journal Article
• Authors: Gan, Lizhen; Ye, Lingting; Liu, Mingzhou; Tao, Shanwen; Xie, Kui
• Is Part Of: RSC advances. Volume 6:Issue 1(2016)
• Page Start: 641
• Page End: 647
• Publication Date: 2015-12-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra19844e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this work, catalytic active Sc has been doped into perovskite La0.8 Sr0.2 MnO3− δ lattice to enhance electrode activity and promising electrode performance for steam oxidation has been obtained. Abstract : Perovskite La0.8 Sr0.2 MnO3− δ is widely used as an anode for proton-conducting solid oxide steam electrolyzers; however, the insufficient electro-catalytic activity still restricts the electrochemical steam oxidation activity. In this work, catalytically-active scandium is doped into the B-site of the manganate La0.8 Sr0.2 Mn1− x Sc x O3− δ ( x = 0–0.1) to enhance the electrocatalytic performance. Combined characterizations of XRD, TEM, XPS, SEM and EDS confirm the successful partial replacement of Mn by Sc in the B-site. The doping of Sc remarkably improves ionic conductivity while accordingly decreases electronic conductivity. The electrocatalytic activity has been greatly improved and the composition of La0.8 Sr0.2 Mn1− x Sc x O3− δ with x = 0.05 has demonstrated the best electrode polarization performance. The faradic efficiency is significantly enhanced to as high as 80% for La0.8 Sr0.2 Mn1− x Sc x O3− δ ( x = 0.05) in a proton conducting solid oxide electrolyzer in contrast to a cell with traditional LSM anode for high temperature steam electrolysis.