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An all-oxide electrolysis cells for syngas production with tunable H2/CO yield via co-electrolysis of H2O and CO2

Journal Article · · Journal of Power Sources
 [1];  [2];  [3];  [4];  [3];  [5];  [5];  [5];  [6]
  1. Inner Mongolia Univ. of Science and Technology, Baotou (China). School of Materials and Metallurgy. Inner Mongolia Key Laboratory of Advanced Ceramics and Device; Univ. of Science and Technology Beijing (China). Collaborative Innovation Center of Steel Technology; Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering; Colorado School of Mines, Golden, CO (United States)
  2. Kansas State Univ., Manhattan, KS (United States). Dept. of Chemical Engineering
  3. Univ. of Science and Technology Beijing (China). Collaborative Innovation Center of Steel Technology
  4. Flemish Inst. for Technological Research (VITO), Boeretang (Belgium). Separation and Conversion Technology
  5. Inner Mongolia Univ. of Science and Technology, Baotou (China). School of Materials and Metallurgy. Inner Mongolia Key Laboratory of Advanced Ceramics and Device
  6. Colorado School of Mines, Golden, CO (United States). Dept. of Metallurgical and Materials Engineering
+ Show Author Affiliations
High-rate production of syngas with tunable H2/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-δ(LSFNi) cathode is used to trigger the in-situ exsolution of Ni-Fe alloy nanoparticles with an average size of ~45 nm uniformly distributed and socketed on LSFNi backbone, enabling efficient co-electrolysis of H2O and CO2 to H2 and CO. At 1.5 V, the current density reaches ~1.0 A cm-2 at 750 °C and ~2.4 A cm-2 at 850 °C with near 100% Faradaic Efficiency. We demonstrate the feasibility of tuning the output H2/CO ratio by nearly two orders of magnitude (from ~0.1 to ~7) by manipulating H2O/CO2 ratio of feed gas, operating temperature, and current density. Finally, 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.
Research Organization:
Colorado School of Mines, Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Fossil Energy (FE)
Grant/Contract Number:
FE0031716
OSTI ID:
1849300
Journal Information:
Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 482; ISSN 0378-7753
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ceramic cathode
Chemistry
Electrochemistry
Energy & Fuels
Materials Science
Solid oxide electrolysis cells
Syngas
in-situ exsolution