Ostwald ripening mechanism-derived MnOOH induces lattice oxygen escape for efficient aqueous MnO2–Zn batteries

文献情報

出版日 2023-10-24

DOI 10.1039/D3TA05364D

インパクトファクター 12.732

著者

Chenchen Qin, Chi Chen, Chuankun Zhang, Xin Chen, Yi Gan, Jingying Li, Jia Yao, Xin Liu, Junyan Cheng, Dan Sun

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要旨

Aqueous rechargeable MnO2–Zn batteries have attracted much attention in recent years due to their high security, low cost and environmentally friendly nature. Nevertheless, the practical application of MnO2 cathode materials is limited by the slow reaction kinetics during cycling and the poor cycle life caused by the disproportionation reaction of Mn. Here, we innovatively prepared MnOOH intermediates via the Ostwald ripening mechanism, followed by thermal treatment to induce lattice oxygen escape to finally obtain oxygen-defect-rich β-MnO2(Od) nanorods. First-principles calculations have shown that the oxygen defects can serve as p-type dopants to yield better electrical conductivity and enhance the adsorption capability of β-MnO2 for protons. The tested Zn//β-MnO2(Od) batteries demonstrated an impressive specific capacity of 330.9 mA h g−1 at 100 mA g−1. After 800 charge–discharge cycles at 1 A g−1, they maintained a capacity of 171 mA h g−1 with a capacity retention rate of 88.9%. This work offers fascinating prospects for the creation of MnO2 with oxygen-defects and provides distinct insights towards achieving high efficiency, more productive aqueous zinc ion batteries.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Ostwald ripening mechanism-derived MnOOH induces lattice oxygen escape for efficient aqueous MnO2–Zn batteries

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