期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 25, 页码 21688-21695出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b03846
关键词
laser-induced current transients; aqueous Na ion batteries; interfacial charge and mass transfer; water plane structure; Na2Co[Fe(CN)(6)]; battery materials
资金
- cluster of excellence Nanosystems Initiative Munich (NIM)
Development of efficient schemes of energy storage is crucial for finding a solution for the generation versus consumption problem. Aqueous Na-ion batteries have been already recognized as one of the promising candidates for large-scale energy-storage systems. Despite noticeable progress in this field, the actual intercalation mechanisms governing these battery cells are yet to be fully comprehended. In this manuscript, we examine the electrode/electrolyte interface formed between electro-deposited Na2Co[Fe(CN)(6)] films and aqueous solutions. The investigated systems exhibit up to three potentials of maximum entropy (PMEs). To the best of our knowledge, the existence of multiple PMEs in electrochemical systems has never been reported in the literature. These unexpected results are, however, in line with the theory explaining the correlation between the water structure at the interface and the ease of the interfacial mass and charge transfer. Additionally, the obtained PMEs appear to largely depend on the anions' properties, most probably on the hydration energy of these species. This reveals the impact of the electrolyte composition on the interfacial processes in Na-ion batteries.
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