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Rational design has been widely used to develop high-performance metal selenides-based electrode materials for supercapacitors.In this study,we develop a facile one-step solvothermal approach to syn-thesize binder-free Ni3Se2 nanodendrite arrays grown on nickel foam as advanced positive electrodes for supercapacitors.Our Ni3Se2 nanodendrite arrays on nickel foam exhibit a specific capacitance of 1234 F g-1 (3.70 F cm-2) at a current density of 1 A g-1 and a great rate capability,which is benefited from the excellent electrical conductivity and unique hierarchical nano-dendritic structure.Furthermore,an asymmetric supercapacitor device was assembled using activated carbon as the negative electrode and the Ni3Se2 nanodendrite arrays on nickel foam as the positive electrode,obtaining a high energy density of 22.3 W h kg-1 at a power density of 160.4 W kg-1.