期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 29, 页码 15776-15784出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta03467k
关键词
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资金
- National Natural Science Foundation of China [51973099]
- Taishan Scholar Program of Shandong Province [tsqn201812055, tspd20181208]
- State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University) [ZKT04, GZRC202007]
- Expert Workstation Project of Yunnan Province [202105AF150061]
A novel interface engineering strategy was developed to promote the mechanical and electrochemical properties of seaweed-derived alginate fibers, resulting in a conformal composite fiber electrode with excellent performance for wearable supercapacitors.
Bio-based fibers with excellent mechanical and electrochemical properties are crucial to construct high-performance fiber-shaped electrochemical supercapacitors (FESCs) for wearable applications. However, the available biofiber electrodes suffer greatly from the drawbacks of serious interface stability and mechanical durability. Herein, a novel interface engineering strategy was developed to simultaneously promote the mechanical and electrochemical properties of seaweed-derived alginate fibers for organic-inorganic-organic composite fiber electrodes. Utilizing calligraphic ink as a conformal interlayer, a universal scaffold with a hierarchical core-shell structure was formed for sufficiently depositing pseudocapacitive molecules on alginate fibers, which not only boosted the interface stability and mechanical durability, but also resulted in a pathway for effective electrolyte infiltration and accelerated ion diffusion and transfer. As expected, the conformal composite fiber electrode demonstrates an excellent areal capacitance of 1025.6 mF cm(-2) and an ultrahigh mechanical strength of 321 MPa (17 times vs. GO-based composite fibers). The as-assembled symmetrical FESC device shows a high energy density of 5.49 mu W h cm(-2), surpassing most of the state-of-the-art symmetric FESCs based on synthetic fibers. This study provides a universal interface engineering strategy to promote the energy density of FESCs without sacrificing the mechanical strength, which is desirable for sustainable portable and wearable electronics.
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