Journal
JOURNAL OF POWER SOURCES
Volume 482, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.228887
Keywords
Solid oxide electrolysis cells; in-situ exsolution; Ceramic cathode; Syngas
Funding
- China Scholarship council [201706460034]
- Army Research Office [W911NF-17-1-0051]
- Natural Science Foundation of China [51974167]
- U.S. Department of Energy Office of Fossil Energy from the National Energy Technology Laboratory [DE-FE0031716]
- Innovation fund of Inner Mongolia University of Science and Technology [2019QDLB01]
- Natural Science Foundation of Inner Mongolia Autonomous Region [2020BS05033]
- Inner Mongolia Autonomous Region Science and Technology Plan [2020GG0155]
- Beijing Municipal Natural Science Foundation [2192033]
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High-rate production of syngas with tunable H-2/CO ratio and coke-free operation is achieved in a solid-oxide electrolysis cell (SOEC). Pre-reduction of the cathode triggers the in-situ exsolution of Ni-Fe alloy nanoparticles, enabling efficient co-electrolysis for H2O and CO2. The output H-2/CO ratio can be adjusted by manipulating feed gas ratio, temperature, and current density, demonstrating stable operation for >100 h without carbon deposition. Anode/electrolyte interface deteriorates with high current density operation due to rapid oxygen evolution.
High-rate production of syngas with tunable H-2/CO and coke-free operation is achieved in a solid-oxide electrolysis cell (SOEC). Prior to operation, controlled pre-reduction of La0.7Sr0.3Fe0.9Ni0.1O3-delta(LSFNi) cathode is used to trigger the in-situ exsolution of Ni-Fe alloy nanoparticles with an average size of similar to 45 nm uniformly distributed and socketed on LSFNi backbone, enabling efficient co-electrolysis of H2O and CO2 to H-2 and CO. At 1.5 V, the current density reaches similar to 1.0 A cm(-2) at 750 degrees C and similar to 2.4 A cm(-2) at 850 degrees C with near 100% Faradaic Efficiency. We demonstrate the feasibility of tuning the output H-2/CO ratio by nearly two orders of magnitude (from similar to 0.1 to similar to 7) by manipulating H2O/CO2 ratio of feed gas, operating temperature, and current density. Stable operation for >100 h is obtained without evidence of carbon deposition, although high current density operation leads to observable deterioration of anode/electrolyte interface due to the rapid oxygen evolution.
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