Revitalizing interface in protonic ceramic cells by acid etch
Revitalizing interface in protonic ceramic cells by acid etch
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DOI：
10.1038/s41586-022-04457-y
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发表时间：
2022-04-21
期刊：
影响因子：
64.8
通讯作者：
Ding, Dong
中科院分区：
文献类型：
--
作者：
Bian, Wenjuan;Wu, Wei;Ding, Dong
质子陶瓷电化学电池有望在600摄氏度以下运行（参考文献100）。（1，）（2））。尽管已经证明了本体电解质的高质子传导率，但由于未知原因，它不能完全用于电化学全电池（3）。在这里，我们表明，这些问题是由低温处理的氧电极-电解质界面之间的接触不良引起的。我们证明，一个简单的酸处理可以有效地恢复高温退火的电解质表面，导致氧电极和电解质之间的反应性键合和改善的电化学性能和稳定性。这使得质子陶瓷燃料电池在低至350摄氏度的温度下具有出色的性能，在600摄氏度下的峰值功率密度为1.6 W cm（-2），在450摄氏度下为650 mW cm（-2），在350摄氏度下为300 mW cm（-2），以及在1.4 V和600 ℃下电流密度高于3.9 A cm（-2）的稳定电解操作。我们的工作突出了界面工程在陶瓷电化学设备中的关键作用，并为可持续能源基础设施提供了新的理解和实践。
Protonic ceramic electrochemical cells hold promise for operation below 600 degrees C (refs.(1,)(2)). Although the high proton conductivity of the bulk electrolyte has been demonstrated, it cannot be fully used in electrochemical full cells because of unknown causes(3). Here we show that these problems arise from poor contacts between the low-temperature processed oxygen electrode-electrolyte interface. We demonstrate that a simple acid treatment can effectively rejuvenate the high-temperature annealed electrolyte surface, resulting in reactive bonding between the oxygen electrode and the electrolyte and improved electrochemical performance and stability. This enables exceptional protonic ceramic fuel-cell performance down to 350 degrees C, with peak power densities of1.6 W cm(-2) at 600 degrees C, 650 mW cm(-2) at 450 degrees C and 300 mW cm(-2) at 350 degrees C, as well as stable electrolysis operations with current densities above 3.9 A cm(-2) at 1.4 V and 600 degrees C. Our work highlightsthe critical role of interfacial engineering in ceramic electrochemical devices and offers new understanding and practices for sustainable energy infrastructures.