Novel High-Energy-Density Rechargeable Hybrid Sodium-Air Cell with Acidic Electrolyte

Yao Kang, Fengmei Su, Qingkai Zhang, Feng Liang, Keegan R. Adair, Kunfeng Chen, Dongfeng Xue, Katsuro Hayashi, Shan Cecilia Cao, Hossein Yadegari, Xueliang Sun

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9 Citations (Scopus)

Abstract

Low-cost, high-energy-density, and highly efficient devices for energy storage have long been desired in our society. Herein, a novel high-energy-density hybrid sodium-air cell was fabricated successfully on the basis of acidic catholytes. Such a hybrid sodium-air cell possess a high theoretical voltage of 3.94 V, capacity of 1121 mAh g-1, and energy density of 4418 Wh kg-1. First, the buffering effect of an acidic solution was demonstrated, which provides relatively long and stable cell discharge behaviors. Second, the catholytes of hybrid sodium-air cells were optimized systematically from the solutions of 0.1 M H3PO4 + 0.1 M Na2SO4 to 0.1 M HAc + 0.1 M NaAc and it was found that the cells with 0.1 M H3PO4 + 0.1 M Na2SO4 displayed a maximum power density of 34.9 mW cm-2. The cell with 0.1 M H3PO4 + 0.1 M Na2SO4 displayed higher discharge capacity of 896 mAh g-1. Moreover, the fabricated acidic hybrid sodium-air cells exhibited stable cycling performance in ambient air and they delivered a low voltage gap around 0.3 V when the current density is 0.13 mA cm-2, leading to a high energy efficiency up to 90%. Therefore, the present study provides new opportunities to develop highly cost-effective energy storage technologies.

Original languageEnglish
Pages (from-to)23748-23756
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number28
DOIs
Publication statusPublished - Jul 18 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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  • Cite this

    Kang, Y., Su, F., Zhang, Q., Liang, F., Adair, K. R., Chen, K., Xue, D., Hayashi, K., Cao, S. C., Yadegari, H., & Sun, X. (2018). Novel High-Energy-Density Rechargeable Hybrid Sodium-Air Cell with Acidic Electrolyte. ACS Applied Materials and Interfaces, 10(28), 23748-23756. https://doi.org/10.1021/acsami.8b04278