Hybrid Sn–Co binary oxide nanosheets grown on carbon paper as the supercapacitor electrode materials

Hybrid Sn–Co binary oxide with different Sn/Co feeding molar ratios on carbon paper are successfully obtained using a facile hydrothermal method followed by a post-annealing procedure. The results of electrochemical tests show that the electrode with a feeding molar ratio of 1:4 (named as Sn₁Co₄) has better electrochemical performance than that of the others. The specific capacitance can achieve 937.4 F g⁻¹at 5 mV s⁻¹ (580.8 F g⁻¹ at 1 A g⁻¹), as well as the capacitance retention is 97.5% after the galvanostatic charge-discharge for 20000 cycles at 30 A g⁻¹. These results demonstrate that the Sn₁Co₄ can be considered as a potential electrode material for the next generation supercapacitor.