Granular Nanosheets Made of Interconnected NiTe2-CoTe2 Nanoparticles on Carbon Fibers for High-Performance Hybrid Supercapacitors
ACS Applied Energy Materials(2022)
Abstract
Recently, metal tellurides have been widely used as functional materials in energy storage, environment, or catalysis. However, designing synergistic bimetallic tellurides with excellent electrochemical performance remains a huge challenge, especially in high-performance supercapacitors. Herein, high-capacity nickel-cobalt telluride nanosheets were synthesized on carbon fibers (CF@CoTe2-NiTe2). First, using Co-MOF nanosheet arrays as template, nickel-cobalt layered double hydroxide nanosheets were prepared by a simple Ni ion etching. Then, the CF@CoTe2-NiTe2 was fabricated based on the as-obtained NiCo-LDH nanoarrays in tellurium vapor. Significantly, the CoTe2-NiTe2 nanosheets are made up of many interconnected CoTe2 and NiTe2 nanoparticles, enhancing the effective contact with the electrolyte solution during the oxidation reaction. The as-prepared CF@CoTe2-NiTe2 exhibits a high electrochemical capacitance of 261.4 mAh g(-1) at 1.0 A g(-1) and an outstanding capacitance retention of 70% when the current density reached 20 A g(-1). Remarkably, the hybrid supercapacitor assembled by CF@CoTe2-NiTe2 and CF@Fe2O3 presents 41 Wh kg(-1) at 750 W kg(-1), with a high capacitance retention (87.6% after 5000 cycles). Therefore, bimetallic tellurides may be used as more functional materials for applying to energy storage.
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Key words
Co-MOF, NiCo-LDH nanosheets, CoTe2-NiTe2 interconnected nanoparticles, ultrahigh capacitance, supercapacitor
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