Suppressing Structure Delamination for Enhanced Electrochemical Performance of Solid Oxide Cells

Jingzeng Cui; Yuxuan Zhang; Zhiwei Hu; Chang-Yang Kuo; Chun-Fu Chang; Yu-Chieh Ku; Ze Liu; Ziting Xia; Jianqiu Zhu; Jichao Zhang; Yan He; Jingyuan Ma; Aiguo Li; Xiao Lin; Chien-Te Chen; Guntae Kim; Jian-Qiang Wang; Linjuan Zhang

doi:10.1002/smtd.202400178

Suppressing Structure Delamination for Enhanced Electrochemical Performance of Solid Oxide Cells

Small Methods. 2024 Apr 30:e2400178. doi: 10.1002/smtd.202400178. Online ahead of print.

Authors

Jingzeng Cui^{1

2}, Yuxuan Zhang¹, Zhiwei Hu³, Chang-Yang Kuo^{4

5}, Chun-Fu Chang³, Yu-Chieh Ku^{3

4}, Ze Liu^{1

2}, Ziting Xia^{1

2}, Jianqiu Zhu^{1

2}, Jichao Zhang⁶, Yan He⁶, Jingyuan Ma⁶, Aiguo Li⁶, Xiao Lin¹, Chien-Te Chen⁵, Guntae Kim^{1

2}, Jian-Qiang Wang^{1

2}, Linjuan Zhang^{1

2}

Affiliations

¹ Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, P. R. China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187, Dresden, Germany.
⁴ Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan, Republic of China.
⁵ National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Republic of China.
⁶ Shanghai Synchrotron Radiation Facility, Zhangjiang Laboratory, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, P. R. China.

PMID: 38686689
DOI: 10.1002/smtd.202400178

Abstract

Reversible solid oxide cells (rSOCs) have significant potential as efficient energy conversion and storage systems. Nevertheless, the practical application of their conventional air electrodes, such as La_0.8Sr_0.2MnO_3-δ (LSM), Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF), and PrBa_0.8Ca_0.2Co₂O_5+δ (PBCC), remains unsatisfactory due to interface delamination during prolonged electrochemical operation. Using micro-focusing X-ray absorption spectroscopy (µ-XAS), a decrease (increase) in the co-valence state from the electrode surface to the electrode/electrolyte interface is observed, leading to the above delamination. Utilizing the one-pot method to incorporate an oxygen-vacancy-enriched CeO₂ electrode into these air electrodes, the uniform distribution of the Co valence state is observed, alleviating the structural delamination. PBCC-CeO₂ electrodes exhibited a degradation rate of 0.095 mV h^-1 at 650 °C during a nearly 500-h test as compared with 0.907 mV h^-1 observed during the 135-h test for PBCC. Additionally, a remarkable increase in electrolysis current density from 636 to 934 mA cm^-2 under 1.3 V and a maximum power density from 912 to 989 mW cm^-2 upon incorporating CeO₂ into PBCC is also observed. BSCF-CeO₂ and LSM-CeO₂ also show enhanced electrochemical performance and prolonged stability as compared to BSCF and LSM. This work offers a strategy to mitigate the structural delamination of conventional electrodes to boost the performance of rSOCs.

Keywords: X‐ray absorption spectroscopy; air electrodes; delamination; reversible solid oxide cells; stability.

Abstract

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