Ni0.9Co1.92Se4 nanostructures: binder-free electrode of coral-like bimetallic selenide for supercapacitors

作者：An, Weidan; Liu, Ling; Gao, Yanfang^*; Liu, Yang; Liu, Jinrong

来源：RSC Advances, 2016, 6(79): 75251-75257.

DOI：10.1039/c6ra17825a

• HIGH-PERFORMANCE SUPERCAPACITORS
• CARBON-FIBER PAPER
• IN-SITU GROWTH
• OXYGEN REDUCTION
• HOLLOW SPHERES
• NICO2S4
• FOAM
• NANOSHEETS
• GRAPHENE
• HYBRID

Coral-like Ni0.9Co1.92Se4 nanostructured materials have been prepared through a simple and controlled two-step solvothermal method, which present a handsome electrochemical performance. The specific capacitance reaches 1021.1 F g(-1) under the current density of 2 mA cm(-2) over a 0.5 V electrode potential window with an areal capacitance of 6.43 F cm(-2). A superior rate capability of 77% is achieved with discharge rates increasing from 2 to 50 mA cm(-2), as well as a good cycling stability of 88.39% after 5000 cycles. Furthermore, a good energy density of 26.29 W h kg(-1) is achieved under the power density of 265 W kg(-1) when assembled into a Ni0.9Co1.92Se4//AC asymmetric supercapacitor with the operating potential window extended to 1.5 V. The high performance can be attributed to the coral-like architectures with rich redox reactions, high conductivity and transport rate for both electrons and electrolyte ions. Our results suggest that the coral-like Ni0.9Co1.92Se4 nanostructured electrode materials may be a good choice for supercapacitors.

• 出版日期2016
• 单位内蒙古工业大学