Study on La/Ni co-doped SrTi0.35Fe0.65O3-δ symmetric electrode for H2O/CO2 co-electrolysis in SOECs

doi:10.3969/j.issn.2097-0706.2022.08.004

Abstract

Abstract:

Hydrogen production from water steam electrolysis powered by solid oxide electrolysis cells （SOECs） and syngas production by co-electrolysis of H₂O/CO₂ are important routes to promote the application of renewable energy and development of green and low-carbon chemical industry. To meet the demands for high performance and stable operation of SOECs,La/Ni co-doped SrTi_0.35Fe_0.65O_3-_δ strategy was adopted,and La_0.1Sr_0.85Ti_0.35Fe_0.6Ni_0.05O₃ （LSTFN） was designed and prepared as both hydrogen and oxygen electrodes for SOECs. The structural composition and micromorphological evolution of LSTFN electrode were investigated by scanning electron microscopy（SEM）, energy dispersive spectroscopy （EDS） and X-ray diffraction （XRD）. The H₂O/CO₂ co-electrolysis performance and reversible operation stability were examined. The results show that, Ni-Fe alloy nanoparticles in-situ precipitated on LSTFN hydrogen electrode surface are stable in complex steam and carbon-containing atmospheres. The LSTFN co-electrolysis current reaches 1.8 A/cm² in 800 ℃,1.8 V and 10% H₂ protective atmosphere（H₂/H₂O/CO₂=10∶45∶45）. LSTFN symmetric cell performs stably in reversible operations between power generation and co-electrolysis, showing good application prospects.

Key words: solid oxide electrolysis cell, CO₂/H₂O co-electrolysis, symmetrical electrode, SrTi_0.35Fe_0.65O_3-_δ, green and low-carbon development, hydrogen production, perovskite, renewable energy

CLC Number:

TK91:TM911

HAN Qianwen, ZHANG Kun, CHEN Xiaoyang, ZHU Tenglong. Study on La/Ni co-doped SrTi_0.35Fe_0.65O_3-_δ symmetric electrode for H₂O/CO₂ co-electrolysis in SOECs[J]. Integrated Intelligent Energy, 2022, 44(8): 43-49.

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Study on La/Ni co-doped SrTi_0.35Fe_0.65O_3-_δ symmetric electrode for H₂O/CO₂ co-electrolysis in SOECs

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