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Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode

Li, Yihang ; Singh, Manish LU ; Zhuang, Zechao ; Jing, Yifu ; Li, Fengjiao ; Maliutina, Kristina ; He, Chuanxin and Fan, Liangdong (2021) In SCIENCE CHINA Materials 64(5). p.1114-1126
Abstract

The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr3Fe1.25Mo0.75O7−δ (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr3Fe1.25Mo0.75O7−δ (SFM) from a Sr2Fe7/6Mo0.5Co1/3O6−δ (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO2 conversion in RSOC. The CoFe-SFM fuel electrode... (More)

The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr3Fe1.25Mo0.75O7−δ (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr3Fe1.25Mo0.75O7−δ (SFM) from a Sr2Fe7/6Mo0.5Co1/3O6−δ (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO2 conversion in RSOC. The CoFe-SFM fuel electrode shows improved catalytic activity by accelerating oxygen diffusion and surface kinetics towards the CO/CO2 conversion as demonstrated by the distribution of relaxation time (DRT) study and equivalent circuit model fitting analysis. Furthermore, an electrolyte-supported single cell is evaluated in the 2:1 CO-CO2 atmosphere at 800°C, which shows a peak power density of 259 mW cm−2 for CO oxidation and a current density of −0.453 A cm−2 at 1.3 V for CO2 reduction, which correspond to 3.079 and 3.155 mL min−1 cm−2 for the CO and CO2 conversion rates, respectively. More importantly, the reversible conversion is successfully demonstrated over 20 cyclic electrolysis and fuel cell switching test modes at 1.3 and 0.6 V. This work provides a useful guideline for designing a fuel electrode through a surface/interface exsolution process for RSOC towards efficient CO-CO2 reversible conversion.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CO-CO conversion, cyclic test, perovskite oxide, phase transformation, reversible solid oxide cells
in
SCIENCE CHINA Materials
volume
64
issue
5
pages
13 pages
publisher
Science China Press
external identifiers
  • scopus:85102465900
ISSN
2095-8226
DOI
10.1007/s40843-020-1531-7
language
English
LU publication?
yes
id
3f2681fd-da34-420c-bf9d-8fd27a6f952c
date added to LUP
2021-12-20 10:28:40
date last changed
2025-01-13 20:12:32
@article{3f2681fd-da34-420c-bf9d-8fd27a6f952c,
  abstract     = {{<p>The reversible solid oxide cell (RSOC) is an attractive technology to mutually convert power and chemicals at elevated temperatures. However, its development has been hindered mainly due to the absence of a highly active and durable fuel electrode. Here, we report a phase-transformed CoFe-Sr<sub>3</sub>Fe<sub>1.25</sub>Mo<sub>0.75</sub>O<sub>7−δ</sub> (CoFe-SFM) fuel electrode consisting of CoFe nanoparticles and Ruddlesden-Popper-layered Sr<sub>3</sub>Fe<sub>1.25</sub>Mo<sub>0.75</sub>O<sub>7−δ</sub> (SFM) from a Sr<sub>2</sub>Fe<sub>7/6</sub>Mo<sub>0.5</sub>Co<sub>1/3</sub>O<sub>6−δ</sub> (SFMCo) perovskite oxide after annealing in hydrogen and apply it to reversible CO/CO<sub>2</sub> conversion in RSOC. The CoFe-SFM fuel electrode shows improved catalytic activity by accelerating oxygen diffusion and surface kinetics towards the CO/CO<sub>2</sub> conversion as demonstrated by the distribution of relaxation time (DRT) study and equivalent circuit model fitting analysis. Furthermore, an electrolyte-supported single cell is evaluated in the 2:1 CO-CO<sub>2</sub> atmosphere at 800°C, which shows a peak power density of 259 mW cm<sup>−2</sup> for CO oxidation and a current density of −0.453 A cm<sup>−2</sup> at 1.3 V for CO<sub>2</sub> reduction, which correspond to 3.079 and 3.155 mL min<sup>−1</sup> cm<sup>−2</sup> for the CO and CO<sub>2</sub> conversion rates, respectively. More importantly, the reversible conversion is successfully demonstrated over 20 cyclic electrolysis and fuel cell switching test modes at 1.3 and 0.6 V. This work provides a useful guideline for designing a fuel electrode through a surface/interface exsolution process for RSOC towards efficient CO-CO<sub>2</sub> reversible conversion.</p>}},
  author       = {{Li, Yihang and Singh, Manish and Zhuang, Zechao and Jing, Yifu and Li, Fengjiao and Maliutina, Kristina and He, Chuanxin and Fan, Liangdong}},
  issn         = {{2095-8226}},
  keywords     = {{CO-CO conversion; cyclic test; perovskite oxide; phase transformation; reversible solid oxide cells}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{1114--1126}},
  publisher    = {{Science China Press}},
  series       = {{SCIENCE CHINA Materials}},
  title        = {{Efficient reversible CO/CO2 conversion in solid oxide cells with a phase-transformed fuel electrode}},
  url          = {{http://dx.doi.org/10.1007/s40843-020-1531-7}},
  doi          = {{10.1007/s40843-020-1531-7}},
  volume       = {{64}},
  year         = {{2021}},
}