With the rapid development of flexible wearable electronic products, flexible all graphene-based supercapacitors (FGSCs) with reduced graphene oxide rGO//graphene oxide (GO)//rGO structure have attracted substantial attention due to their unique structures and energy storage mechanism. However, restricted by design idea and preparation technology, improvement of capacitance performance for the FGSCs is not obvious recently. Herein, we demonstrate that an interface integration strategy of constructing the high-performance FGSCs with compact structure. Hydroquinone (HQ)-modified rGO (HQ-rGO) films (electrode materials) and sulfuric acid-intercalated GO films (electrolyte/separator) are assembled into the FGSCs utilizing hydrogen bonding and capillary contractility. The HQ further improves the electrochemical capacitance of electrode materials. The synergistic effect of the hydrogen bonding and capillary contractility guarantees compact and stable structure of the device. The resulting FGSCs exhibit an excellent areal capacitance of 804.6 mF cm− 2 (@2 mA cm− 2) and 441 mF cm− 2 (@30 mA cm− 2), and their highest energy and power densities can achieve 109.5 μWh cm− 2 and 21,060 μW cm− 2, respectively. These performances are superior to other all-in-one graphene-based SCs reported. Therefore, the construction technology of the FGSCs is a promising for developing all graphene-based SCs with high-performance.

Constructing all-in-one graphene-based supercapacitors for electrochemical energy storage via interface integration strategy
    Abstract
    1 Introduction
    2 Experimental section
        2.1 Materials
        2.2 Fabrication of SGO and GH films
        2.3 Fabrication of FGSCs devices
        2.4 Materials characterization
        2.5 Electrochemical measurements
    3 Results and discussion
        3.1 Preparation and characterization of the HQ-rGO films
        3.2 Electrochemical performance of the FGSCs
    4 Conclusion
    Anchor 14
    Acknowledgements 
    References

• Yucan Zhu(College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Long Peng(Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Song Chen(College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Hong Yin(Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Minjie Zhou(Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Zhaohui Hou(Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Liang Chen(Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Wei Wang(Key Laboratory of Hunan Province for Advanced Carbon‑Based Functional Materials, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)
• Jianxing Xia(State Key Laboratory of Electronic Thin Films and Integrated Devices, National Engineering Research Center of Electromagnetic Radiation Control Materials, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, People’s Republic of China)
• Yuchao Feng(College of Mechanical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, People’s Republic of China)