School of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, Hefei 230009, China
For high performance supercapacitors, novel hierarchical yolk-shell a-Ni(OH)2/Mn2O3 microspheres were controllably synthesized using a facile two-step method based on the solvothermal treatment. The unique a-Ni(OH)2 based yolk-shell microstructures decorated with numerous interconnected nanosheets and the hetero-composition features can synergistically enhance reactive site exposure and electron conduction within the microspheres, facilitate charge transfer between electrolyte and electrode materials, and release structural stress during OH− chemisorption/desorption. Moreover, the Mn2O3 sediments distributed over the a-Ni(OH)2 microspheres can serve as an effective protective layer for electrochemical reactions. Consequently, when tested in 1 mol·L−1 KOH aqueous electrolyte for supercapacitors, the yolk-shell a-Ni(OH)2/Mn2O3 microspheres exhibited a considerably high specific capacitance of 2228.6 F·g−1 at 1 A·g−1 and an impressive capacitance retention of 77.7% after 3000 cycles at 10 A·g−1. The proposed a-Ni(OH)2/Mn2O3 microspheres with hetero-composition and unique hierarchical yolk-shell microstructures are highly promising to be used as electrode materials in supercapacitors and other energy storage devices.
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