Zn2SnO4/activated carbon composites for high cycle performance supercapacitor electrode

Owing to the advantages of the conductive activated carbon (AC) and capacitive Zn2SnO4, a series of Zn2SnO4/AC composites are successfully prepared by a co-precipitation method. The textural structure of Zn2SnO4/AC composites illustrate that the Zn(2)Sna(4) nanoparticles are anchored into the micropores of AC. The systematical electrochemical investigation demonstrates that the specific capacitance of the Z-150 sample (including 25% Zn2SnO4) is 322.6 F g(-1) at a current density of 1 A g(-1). The specific capacitance values are retained 96.5%, 91.1% and 81.6% at the current density of 1 A g(-1), 8 A g(-1) and 16 A g(-1) after 3000 cycles, respectively. This confirms the excellent electrochemical performance and good long-term cycling stability of Zn2SnO4/AC composites as supercapacitor electrodes at high current densities. (C) 2018 Elsevier B.V. All rights reserved.