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Water‐Soluble Hybrid Graphene Ink for Gravure‐Printed Planar Supercapacitors
Author(s) -
Chang Quanhong,
Li Lemei,
Sai Liman,
Shi Wangzhou,
Huang Lei
Publication year - 2018
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201800059
Subject(s) - supercapacitor , materials science , graphene , capacitance , electrolyte , horizontal scan rate , nanotechnology , inkwell , printed electronics , polyvinyl alcohol , microelectrode , screen printing , planar , chemical engineering , electrochemistry , electrode , composite material , cyclic voltammetry , chemistry , computer science , engineering , computer graphics (images)
Flexible printed all‐solid‐state graphene‐based planar supercapacitors have attracted great attentions for their potential applications in portable and wearable electronics. However, the limited ion accessible surface area and slow ion diffusion rate lead to low specific capacitance and poor rate performance. Increasing the diffussion of polyvinyl alcohol (PVA)‐based gel electrolyte into the printed graphene microelectrodes is a great challenge for improving its energy storage. In this work, the hydrophilic N‐doped graphene combining with the PVA‐H 3 PO 4 gel electrolyte is attempted to assemble to a stabilized water‐soluble graphene@PVA‐H 3 PO 4 hybrid ink formulation for gravure‐printed planar supercapacitors. Through optimizing the ink properties and investigating the physical interaction between the ink and gravure cells, graphene@PVA‐H 3 PO 4 microelectrodes are successfully gravure printed. The improved accessibility of electrolyte ions to the active surfaces of graphene in the printed microelectrodes leads to the enhanced electrochemical performance of the flexible planar supercapacitors. The increased areal capacitance of 37.5 mF cm −2 is achieved at a scan rate of 5 mV s −1 . The maximum energy density of 5.20 µWh cm −2 is obtained at the areal power density of 3.2 mW cm −2 , corresponding to a volumetric energy density of 2.08 mWh cm −3 .