Abstract
Structural supercapacitors (SSCs) based on commercial carbon fiber cloth (CC) and resin can combine high specific capacitance with mechanical strength to achieve lightweight, making it an attractive option for portable devices, electric vehicles, and aerospace industries. Herein, a dually activated carbon cloth (ACC) is designed as the functional current collector, and then NiCo2O4/rGO (NCG) composite is synthesized and coated on the former to fabricate into the positive electrode. In the typical SSC, a positive electrode (NCG@ACC), a separator (glass fabric), and a negative electrode (AC@ACC) are bonded together by a particular ion-modified epoxy resin. The SSC (NCG-40@ACC) exhibits the specific capacitance of 10.8 F g−1, the highest energy density of 4.8 Wh kg−1 at the power density of 50 W kg−1, and the excellent cycle stability (the capacitance retention is 93.5 % after 4500 cycles). Mechano-electrochemical tests are also performed to verify the stable electrochemical behavior under bending (from 0° to 120°) and the good mechanical performance (tensile strength of 57.4 MPa and tensile modulus of 10.4 Gpa), respectively. The competitive mechano-electrochemical properties of NCG-40@ACC makes it a promising candidate for the development of structural supercapacitors.
Published Version
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