Affiliation:
1. State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China
2. Greater Bay Area Institute for Innovation Hunan University Guangzhou 511300 China
3. School of Chemistry Xiangtan University Xiangtan 411105 China
Abstract
AbstractManganese dioxide (MnO2) is an attractive cathode material for aqueous zinc batteries (AZBs) owing to its environmental benignity, low cost, high operating voltage, and high theoretical capacity. However, the severe dissolution of Mn2+ leads to rapid capacity decay. Herein, a self‐assembled layer of amino‐propyl phosphonic acid (AEPA) on the MnO2 surface, which significantly improves its cycle performance is successfully modified. Specifically, AEPA can be firmly attached to MnO2 through a strong chemical bond, forming a hydrophobic, and uniform organic coating layer with a few nanometers thickness. This coating layer can significantly inhibit the dissolution of Mn2+ by avoiding the direct contact between the electrolyte and cathode, thus enhancing the structural integrity and redox reversibility of MnO2. As a result, the MnO2@AEPA cathode achieves a high reversible capacity of 223 mAh g−1 at 0.5 A g−1 and a high capacity retention of 97% after 1700 cycles at 1 A g−1. This work provides new insights in developing stable Mn‐based cathodes for aqueous batteries.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Hunan Province
Cited by
7 articles.
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