Electrochemical CO2 reduction to CO using solid oxide electrolysis cells with high-performance Ta-doped bismuth strontium ferrite air electrode

Yifeng Zheng, Shun Wang, Zehua Pan and Bo Yin

Energy, 2021, vol. 228, issue C

Abstract: Electrochemical CO2 reduction to CO by using solid-oxide electrolysis cells (SOECs) is a promising option to produce useable fuels using renewable energy. However, traditional cobalt-based air electrodes exhibit high thermal-expansion coefficients and a tendency of Co segregation, compromising long-term stability. Here, Co-free Bi0.5Sr0.5FeO3-δ perovskite was explored with Ta doping into the B-site as the air electrode (BSFTx). Doping Ta enabled a decrease in polarization resistance by 45% from 0.31 Ω cm2 to 0.17 Ω cm2 at 700 °C. The distribution function of relaxation times analysis suggested that the observed improvements can be ascribed to the enhanced mass-transfer processes, which include oxygen diffusion, association, and desorption. The performance of a cathode-supported Ni-YSZ (ytttria-stabilized zirconia)|YSZ|Gd-doped ceria|BSFTx cell was characterized by an electrolysis current of −0.81 A cm−2 under 1.5 V at 800 °C, which corresponds to a CO-production rate of 4.2 × 103 nmol s−1 cm−2 and an electrical efficiency of 98%. Excellent stability of the cell was also demonstrated by steady current density during the 32-h test executed under 1.2 V at 800 °C. The nearly 100% electrical efficiency and the satisfactory performance and stability of SOEC with Ta-doped BSF air electrode indicated its potential use in CO2 reduction technique.

Keywords: Solid oxide electrolysis cells; Electrochemical CO2 reduction; Air electrode; Ta-doped Bi0.5Sr0.5Fe1-xTaxO3-δ; CO2 utilization and upgrade (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:228:y:2021:i:c:s0360544221008288

DOI: 10.1016/j.energy.2021.120579

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