Manganese() oxide-embedded dopamine-derived carbon nanospheres for durable zinc-ion batteries

Manganese oxides are considered highly promising as cathode materials for aqueous zinc-ion batteries (ZIBs) owing to their abundant resources, high discharge potential, and substantial theoretical capacity. Nonetheless, MnO is commonly perceived to exhibit insufficient electrochemical activity and i...

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Published in:Materials chemistry frontiers 2024-10, Vol.8 (21), p.3616-3623
Main Authors: Zhou, Zixiang, Tong, Jianbo, Guo, Jiale, Guo, Shaofeng, Liu, Shuhan, Qin, Zhipeng, Chang, Zelei, Wang, Chao, Liu, Shuling
Format: Article
Language:English
Subjects:
Batteries
Carbon
Cathodes
Discharge
Dopamine
Electrochemical analysis
Electrode materials
Electrodes
Electrolytes
Manganese oxides
Nanospheres
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Summary:Manganese oxides are considered highly promising as cathode materials for aqueous zinc-ion batteries (ZIBs) owing to their abundant resources, high discharge potential, and substantial theoretical capacity. Nonetheless, MnO is commonly perceived to exhibit insufficient electrochemical activity and is deemed unsuitable for Zn 2+ storage. Herein, MnO-embedded PDA-derived carbon (MnO/C-PDA) is utilized as the cathode material for ZIBs, and its electrochemical behavior in ZnSO 4 electrolytes with varying MnSO 4 concentrations is investigated. The results indicate that the incorporation of manganese salt electrolyte notably enhances electrode capacity, though excessively high concentrations of manganese salt diminish electrode activity. In the electrolyte containing 0.2 M MnSO 4 , MnO-C/PDA exhibits a capacity of 295.4 mA h g −1 at 0.1 A g −1 , with negligible capacity degradation even after 100 cycles. Ex situ characterization reveals that during the charging process, MnO transformed into amorphous MnO x , accompanied by the deposition of manganese salts forming MnO x , while the discharge process involved the co-insertion of Zn 2+ and H + . This work is anticipated to enhance comprehension regarding the charge and discharge mechanisms of MnO, thus aiding in the development of manganese oxide cathodes tailored for ZIBs. MnO-embedded dopamine-derived carbon nanospheres are employed as cathode materials in zinc-ion batteries, exhibiting enhanced diffusion kinetics, high capacity, and excellent cycling stability.
ISSN:2052-1537
2052-1537
DOI:10.1039/d4qm00505h