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Sulfur Tolerant LSCM‐based Composite Cathode for High Temperature Electrolysis/Co‐electrolysis of H 2 O and CO 2
Author(s) -
Lim C. K.,
Liu Q.,
Zhou J.,
Sun Q.,
Chan S. H.
Publication year - 2017
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600189
Subject(s) - cathode , electrolysis , electrochemistry , materials science , yttria stabilized zirconia , electrode , chemical engineering , composite material , ceramic , chemistry , electrolyte , cubic zirconia , engineering
The cathode performance of various LSCM‐based composites for high temperature H 2 O electrolysis has been studied by examining their electrochemical behavior under current loading using three‐electrode electrolysis cells with Pt as counter and reference electrodes. Experimental results among pure LSCM, LSCM–GDC, LSCM–YSZ and LSCM–(GDC–YSZ) have shown that LSCM‐GDC exhibits the highest H 2 O electrolysis performance. The ratio between LSCM and GDC is further optimized and it is shown that the LSCM‐GDC with 50–50 wt.% for each component exhibits the highest performance. Benchmarking with a 60–40 wt.% Ni‐YSZ cathode have shown that the optimized LSCM–GDC cathode exhibits better performance for H 2 O electrolysis with a lower area specific resistance. Under a cathodic current of –0.1 A cm −2 , the optimized LSCM–GDC cathode shows much slower degradation, about 10 times slower as compared to the Ni‐YSZ cathode when exposed to 10 ppm of SO 2 for up to 72 h. All the above electrochemical tests have been conducted at 800 °C and 70/30 pH 2 O/pH 2 . Without the use of reducing agent, the optimized LSCM–GDC cathode also shows promising performance for co‐electrolysis of H 2 O and CO 2 at high current densities and stable performance with 5 ppm of SO 2 in the feedstock gas.