Printable Zinc-Ion Hybrid Micro-Capacitors for Flexible Self-Powered Integrated Units
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ARTICLE
Cite as Nano-Micro Lett. (2021) 13:19 Received: 26 February 2020 Accepted: 30 September 2020 © The Author(s) 2020
https://doi.org/10.1007/s40820-020-00546-7
Printable Zinc‑Ion Hybrid Micro‑Capacitors for Flexible Self‑Powered Integrated Units Juan Zeng1, Liubing Dong2, Lulu Sun3, Wen Wang3, Yinhua Zhou3, Lu Wei1 *, Xin Guo1 *
HIGHLIGHTS • This work is a new guide for the design of on-chip energy integrated systems toward the goal of developing highly safe, economic, and long-life smart wearable electronics. • The biomass kelp-carbon based on unique 3D micro-/nanostructure combined with multivalent ion storage contributes to high capacity of the Zn-ion hybrid capacitor. • The flexible solar-charging self-powered system with printed Zn-ion hybrid micro-capacitor as energy storage module exhibits fast photoelectric conversion/storage rate, good mechanical robustness, and cyclic stability. ABSTRACT Wearable self-powered systems devices such as solar-charging power units arouse widespread concerns in scientific and industrial realms. However, their applications
Micro-ZHC for Flexible Self-powered Unit K el C p-c at a ho rb de on
integrated with energy conversion and storage
Zn
An
Energy
od
e
convers
ion
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are hampered by the restrictions of unbefitting
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size matching between integrated modules, limited tolerance to the variation of input cur-
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rgy
rent, reliability, and safety issues. Herein, flexible solar-charging self-powered units based on printed Zn-ion hybrid micro-capacitor as the energy storage module is developed.
Adsportion/ Desportion Zn2+
CF3SO3−
stor
age
Depositing/ Stripping
Unique 3D micro-/nano-architecture of the
biomass kelp-carbon combined with multivalent ion ( Zn2+) storage endows the aqueous Zn-ion hybrid capacitor with high specific capacity (196.7 mAh g−1 at 0.1 A g−1). By employing an in-plane asymmetric printing technique, the fabricated quasi-solid-state Zn-ion hybrid micro-
capacitors exhibit high rate, long life and energy density up to 8.2 μWh c m−2. After integrating the micro-capacitor with organic solar cells, the derived self-powered system presents outstanding energy conversion/storage efficiency (ηoverall = 17.8%), solar-charging cyclic stability (95% after 100 cycles), wide current tolerance, and good mechanical flexibility. Such portable, wearable, and green integrated units offer new insights into
design of advanced self-powered systems toward the goal of developing highly safe, economic, stable, and long-life smart wearable electronics. KEYWORDS Zinc-ion hybrid capacitor; Kelp-carbon; Zinc metal anode; Multivalent ion storage; Self-powered unit * Lu Wei, [email protected]; Xin Guo, [email protected] 1 State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China 2 College of Chemistry and Materials Science, Jinan University, Guangzhou 511443, People’s Republic of China 3 Wuhan National Laborator
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