Integrated Intelligent Energy ›› 2022, Vol. 44 ›› Issue (8): 43-49.doi: 10.3969/j.issn.2097-0706.2022.08.004

• Cell System with Oxygen-Ion Conducting Electrolyte • Previous Articles     Next Articles

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

HAN Qianwen1(), ZHANG Kun1(), CHEN Xiaoyang1,2(), ZHU Tenglong1,*()   

  1. 1. School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
    2. School of Materials Science and Engineering, Harbin Institute of Technology(Shenzhen), Shenzhen 518055, China
  • Received:2022-07-17 Revised:2022-08-09 Online:2022-08-25 Published:2022-09-15
  • Contact: ZHU Tenglong E-mail:hanqw1998@163.com;2498249631@qq.com;21S155060@stu.hit.edu.cn;zhutenglong@njust.edu.cn

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 SrTi0.35Fe0.65O3-δ strategy was adopted,and La0.1Sr0.85Ti0.35Fe0.6Ni0.05O3 (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, SrTi0.35Fe0.65O3-δ, green and low-carbon development, hydrogen production, perovskite, renewable energy

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