期刊
ENERGY STORAGE MATERIALS
卷 39, 期 -, 页码 194-202出版社
ELSEVIER
DOI: 10.1016/j.ensm.2021.04.023
关键词
Dry electrode; Self-assembly; Hybrid supercapacitor; Energy efficiency; Solution free
资金
- South Korean Ministry of Science, ICT & Future Planning through the National Research Foundation [2020R1A4A3079710, 2021R1A2C3011585]
- Queensland University of Technology [323000-0424/07]
- Centre for Materials Science, QUT, Australia
- Australian Research Council Research Hub for Graphene Enabled Industry Transformation [IH150100003]
- National Research Foundation of Korea [2021R1A2C3011585] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A solution-free dry strategy for growing self-assembled ordered Cu3P nanorod arrays is developed in this study, showing excellent electrochemical performance and cycling stability for solid-state hybrid supercapacitor positive electrodes. The ordered growth of Cu3P nanorod arrays offers a large number of accessible electroactive sites, reduces the number of ion transfer paths, and exhibits reversible redox activity. These versatile solution-free dry strategies pave the way for engineering a range of electrode materials for next-generation energy storage systems.
Herein, a solution-free dry strategy for the growth of self-assembled ordered tricopper phosphide (Cu3P) nanorod arrays is developed and the product is employed as a high-energy, stable positive electrode for a solid-state hybrid supercapacitor (HSC). The ordered Cu3P nanorod arrays grown on the copper foam deliver an excellent specific capacity of 664 mA h/g with an energy efficiency of 88% at 6 A/g and an ultra-long cycling stability over 15,000 continuous charge-discharge cycles. These electrochemical features are attributed to the ordered growth of the Cu3P nanorod arrays, which offers a large number of accessible electroactive sites, a reduced number of ion transfer paths, and reversible redox activity. The potential of the Cu3P nanorod arrays is further explored by engineering solid-state HSCs in which the nanorods are paired with an activated carbon-based negative electrode. The constructed cell is shown to convey a specific energy of 76.85 Wh/kg at a specific power of 1,125 W/kg and an 88% capacitance retention over 15,000 cycles. Moreover, the superior energy storing and delivery capacity of the cell is demonstrated by an energy efficiency of around 65%. The versatile solution-free dry strategies developed here pave the way towards engineering a range of electrode materials for next-generation energy storage systems.
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