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

JOURNAL OF POWER SOURCES

卷:482

Article

Bian, Liuzhen^1,2,5  Duan, Chuancheng³  Wang, Lijun²  Chen, Zhiyuan⁴  Hou, Yunting²  Peng, Jun¹  Song, Xiwen¹  An, Shengli¹  O'Hayre, Ryan⁵ 

[1] Inner Mongolia Univ Sci & Technol, Sch Mat & Met, Inner Mongolia Key Lab Adv Ceram & Device, Baotou 014010, Peoples R China

[2] Univ Sci & Technol Beijing, Collaborat Innovat Ctr Steel Technol, Beijing 100083, Peoples R China

[3] Kansas State Univ, Dept Chem Engn, 1701A Platt St, Manhattan, KS 66506 USA

[4] Flemish Inst Technol Res VITO, Separat & Convers Technol, Boeretang 200, B-2400 Mol, Belgium

[5] Colorado Sch Mines, Dept Met & Mat Engn, 1500 Illinois St, Golden, CO 80401 USA

关键词: Solid oxide electrolysis cells;    in-situ exsolution;    Ceramic cathode;    Syngas;   

DOI  :  10.1016/j.jpowsour.2020.228887

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free