Nanowired NiMoO4/NiSe2/MoSe2 prepared through in situ selenylation as a high performance supercapacitor electrode

Abstract

After in situ selenylation, hydrothermally synthesized NiMoO₄ was partially converted to NiSe₂ and MoSe₂, and the obtained NiMoO₄/NiSe₂/MoSe₂ nanowires were used as a supercapacitor electrode material. The specific capacitance of the nanowired NiMoO₄/NiSe₂/MoSe₂ was significantly higher than that of NiMoO₄ at a current density of 1 A g⁻¹ (955 vs. 489 F g⁻¹). NiMoO₄/NiSe₂/MoSe₂ also exhibited a high capacitance retention of 86.1% after 5000 cycles at 10 A g⁻¹. The high supercapacitive performance of NiMoO₄/NiSe₂/MoSe₂ can be ascribed to the obvious heterointerfaces, rich defects and remarkably increased electrical conductivity after in situ selenylation of NiMoO₄.