法拉第效率
过电位
枝晶(数学)
材料科学
石墨烯
阳极
电化学
成核
电流密度
化学工程
纳米技术
化学
电极
有机化学
工程类
量子力学
物理
几何学
数学
物理化学
作者
Yeon Ju Kwon,Min Gyu Jung,Bung Uk Yoo,Ho Seok Park
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2023-04-24
卷期号:6 (9): 4748-4756
被引量:10
标识
DOI:10.1021/acsaem.2c04079
摘要
Owing to their safety, low cost, and high theoretical energy densities, aqueous Zn-ion batteries (ZIBs) are one of the most promising large-scale energy-storage devices. However, Zn anodes typically degrade the ZIB cycle stability and reversibility owing to dendrite formation and side reactions. Therefore, a three-dimensional (3D) N/O-codoped graphene (NOG) host is electrochemically synthesized in one pot for application to dendrite-free Zn anodes. The 3D NOG host exhibits a limited local current density, low nucleation overpotential, and uniform electric field distribution, which is more advantageous for reversible Zn plating/stripping. A symmetric cell fabricated using a Zn-deposited NOG (Zn@NOG) electrode exhibits excellent cycling stability for 300 h with apparently low voltage hysteresis and dendrite-free behavior, even at a high current density of 1 mA cm–2. Consequently, the Zn@NOG//MnO2 full battery exhibits considerably improved cycling stability and a high coulombic efficiency of more than 99% over 2500 cycles at 0.6 A g–1, whereas the Zn-deposited graphite-sheet-based Zn//MnO2 cell short-circuits over 1000 cycles. Therefore, this method can be used for preparing dendrite-free Zn anodes in a scalable and cost-effective manner.
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