期刊
ENERGY STORAGE MATERIALS
卷 43, 期 -, 页码 120-129出版社
ELSEVIER
DOI: 10.1016/j.ensm.2021.08.043
关键词
Polydopamine; Sodium ions batteries; Quinone-rich; Heterogeneous nucleation
资金
- National Natural Science Foundation of China [51972342, 51872056]
- Shandong Provincial Natural Science Foundation, China [ZR2020QE050]
- Fundamental Research Funds for the Central Universi-ties [20CX06024A]
- China Postdoctoral Science Foun-dation [2019TQ0353, 2020M672165]
- Postdoctoral Innovation Project of Shandong Province [202001014]
- Key Basic Research Projects of Natural Science Foundation of Shandong province [ZR2019ZD51]
- Taishan Scholar Project of Shandong Province [ts20190922]
The study involves the synthesis of PC-PDA-APS with high specific capacity and excellent rate performance using a superfast heterogeneous nucleation process. The synergistic effect of a 3D carbon skeleton, ultrathin PDA coating, and high quinone content significantly enhances the performance of sodium-organic cathode.
Organic cathodes have emerged as promising candidate for sodium ions batteries (SIBs) because of their high theoretical capacity, molecular diversity, and sustainability. However, the inferior rate performance and poor cycle life still restrict their large-scale applications. Herein, a facile strategy for the synthesis of ultrathin quinone-rich polydopamine (PDA) coating which is tightly adhered on 3D porous carbon surface (PC-PDA-APS) is prepared through a superfast (similar to 1.5 h) heterogeneous nucleation process. Ammonium persulfate (APS) used as initiating agent can not only restrain the self-nucleation of dopamine, but also promote the transformation from bi-hydroxyl to bi-carbonyl with an ultra-high conversion rate up to 81%. Having benefited from the synergistic effect of interconnective 3D carbon skeleton, ultrathin PDA coating, and ultrahigh quinone content, the PC-PDA-APS exhibits significantly high specific capacity (322 mA h g(-1) at 0.1 A g(-1)), and excellent rate performance (102 mA h g(-1) at 10 A g(-1)). More specially, the combination of DFT calculations and in-situ FTIR spectroscopy verifies the synergistic Na+ storage mechanisms of reversible enol reaction of C=O groups with Na+ and imine groups (R=N-R') with Na+ This research fundamentally provides a structural engineering method for remarkably improving the performance of sodium-organic cathode.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据