摘要
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 La0.8Sr0.2MnO3−δ (LSM), Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF), and PrBa0.8Ca0.2Co2O5+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.
原文 | English |
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文章編號 | 2400178 |
期刊 | Small Methods |
卷 | 8 |
發行號 | 8 |
DOIs | |
出版狀態 | Published - 8月 2024 |