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New Insights into the Degradation Behavior of Air Electrodes during Solid Oxide Electrolysis and Reversible Solid Oxide Cell Operation
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-29 , DOI: 10.1002/ente.202000241 Muhammad Shirjeel Khan 1 , Xiaoyong Xu 1 , Ruth Knibbe 2 , Ateeq ur Rehman 1 , Zhiheng Li 1 , Anya Josefa Yago 3 , Hao Wang 4 , Zhonghua Zhu 1
Energy Technology ( IF 3.6 ) Pub Date : 2020-07-29 , DOI: 10.1002/ente.202000241 Muhammad Shirjeel Khan 1 , Xiaoyong Xu 1 , Ruth Knibbe 2 , Ateeq ur Rehman 1 , Zhiheng Li 1 , Anya Josefa Yago 3 , Hao Wang 4 , Zhonghua Zhu 1
Affiliation
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The commercialization of reversible solid oxide cells (RSOCs) is limited by the severe degradation of the air electrodes during solid oxide electrolysis cells (SOECs) operation. Herein, the degradation behavior of (La0.8Sr0.2)0.95Mn1−xCoxO3−δ (LSMC) air electrodes where x = 0.1, 0.3, and 0.5 is reported. After the SOEC test, the air electrode with x = 0.1 delaminates. While previous studies reported delamination due to the disintegration of air electrodes, for the first time, it is shown that delamination can also occur due to the disintegration of the samaria‐doped ceria (SDC) barrier layer into nanoparticles. The formation of such nanoparticles weakens the contact between the air electrode and barrier layer and encourages delamination. The air electrode with x = 0.3, shows excellent long‐term stability and also produces an electrolysis current density of 0.63 A cm−2 in 50% H2O/50% H2 at 1.3 V. This mechanistic study will allow researchers to develop air electrodes with improved long‐term stability.
中文翻译：
固体氧化物电解和可逆固体氧化物电池运行过程中空气电极降解行为的新见解
可逆固体氧化物电池（RSOC）的商业化受到固体氧化物电解电池（SOEC）操作期间空气电极的严重降解的限制。在此，报告了x = 0.1、0.3和0.5的（La 0.8 Sr 0.2）0.95 Mn 1- x Co x O3 -δ（LSMC）空气电极的降解行为。经过SOEC测试后，空气电极带有x = 0.1分层。虽然先前的研究报道了由于空气电极的崩解而引起的分层，但首次表明，也可能由于掺有am的二氧化铈（SDC）阻挡层分解为纳米颗粒而发生分层。这种纳米颗粒的形成削弱了空气电极和阻挡层之间的接触并促进了分层。x = 0.3的空气电极具有出色的长期稳定性，并且在1.3 V的50％H 2 O / 50％H 2中产生的电解电流密度为0.63 A cm -2。该机理研究将使研究人员能够开发空气电极具有更高的长期稳定性。
更新日期：2020-09-05
中文翻译：
固体氧化物电解和可逆固体氧化物电池运行过程中空气电极降解行为的新见解
可逆固体氧化物电池（RSOC）的商业化受到固体氧化物电解电池（SOEC）操作期间空气电极的严重降解的限制。在此，报告了x = 0.1、0.3和0.5的（La 0.8 Sr 0.2）0.95 Mn 1- x Co x O3 -δ（LSMC）空气电极的降解行为。经过SOEC测试后，空气电极带有x = 0.1分层。虽然先前的研究报道了由于空气电极的崩解而引起的分层，但首次表明，也可能由于掺有am的二氧化铈（SDC）阻挡层分解为纳米颗粒而发生分层。这种纳米颗粒的形成削弱了空气电极和阻挡层之间的接触并促进了分层。x = 0.3的空气电极具有出色的长期稳定性，并且在1.3 V的50％H 2 O / 50％H 2中产生的电解电流密度为0.63 A cm -2。该机理研究将使研究人员能够开发空气电极具有更高的长期稳定性。
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