Citation: Yi Zhang, Meiyan Wang, Yirong Zhu, Junjun Yao, Rui Zhao, Wenbo Wang. Nanoscale design and composite engineering on RuO₂ cathode for high-performance zinc-ion hybrid capacitors[J]. Chinese Chemical Letters, ;2026, 37(7): 111037. doi: 10.1016/j.cclet.2025.111037 shu

Nanoscale design and composite engineering on RuO₂ cathode for high-performance zinc-ion hybrid capacitors

Yi Zhang ^a ,
Meiyan Wang ^a ,
Yirong Zhu ^{a, *,} ,
Junjun Yao ^a ,
Rui Zhao ^a ,
Wenbo Wang ^{b, *,}

a.
College of Materials and Advanced Manufacturing, Hunan University of Technology, Zhuzhou 412007, China
b.
College of Materials Science and Engineering, Hunan Institute of Technology, Hengyang 421002, China

zhuyirong@hut.edu.cn

wenbohuit1982@163.com

Received Date: 4 December 2024
Revised Date: 24 February 2025
Accepted Date: 5 March 2025
Available Online: 5 March 2025

Figures(5)

The design and exploitation of high-property cathode materials and the exploration of their energy storage mechanism have always been research hotspots in the area of zinc-ion hybrid capacitors (ZHCs). In this study, the new RuO₂ nanodots/reduced graphene oxide (RuO₂ NDs/rGO) composite is designed, and employed as a cathode for ZHC for the first time. Thanks to the synergism of nanoscale design and composite engineering, the RuO₂ NDs/rGO//Zn ZHC delivers large specific capacitance (169.5 mAh/g at 0.1 A/g), splendid rate property (74.4 mAh/g at 20 A/g), eminent cyclic property (up to 10,000 cycles), and high energy and power densities (101.7 Wh/kg and 12 kW/kg). Furthermore, systematic kinetic analyses are used to confirm the rapid ion transport kinetics of the RuO₂ NDs/rGO//Zn ZHC. More importantly, systematic ex-situ measurements are employed to illustrate its energy storage mechanism of the coexistence of electric double-layer capacitance (physical adsorption/desorption of SO₄^2-) and pseudocapacitance (insertion/extraction of Zn²⁺ and H⁺ and chemical adsorption/desorption between Zn²⁺ and oxygen-containing functional groups). This study not only offers a good strategy for the design and exploitation of high-performance pseudocapacitive cathode for ZHCs, but also proposes an insight into energy storage mechanism of RuO₂-based pseudocapacitive cathode.
- RuO₂ nanodots,
- Reduced graphene oxide,
- Pseudocapacitive cathode,
- Zinc-ion hybrid capacitors,
- Energy storage mechanism
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Nanoscale design and composite engineering on RuO2 cathode for high-performance zinc-ion hybrid capacitors

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通讯作者: 陈斌, bchen63@163.com

Nanoscale design and composite engineering on RuO₂ cathode for high-performance zinc-ion hybrid capacitors