Fabrication of porous Mn₂O₃ microsheet arrays on nickel foam as high–rate electrodes for supercapacitors

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays on nickel foam have been prepared by a mild chemical reaction combined with a calcination process. The porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays are directly grown on the surface of the conductive nickel foam. The porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays are composed of numerous interconnected nanopores with an average size of about 16 nm. The specific surface area of the porous Mn<SUB>2</SUB>O<SUB>3</SUB> materials is 36.34 m<SUP>2</SUP> g<SUP>−1</SUP>. The fabricated electrode materials exhibit a high specific capacitance of 566.6 F g<SUP>−1</SUP> at a current density of 0.5 A g<SUP>−1</SUP> and 294.4 F g<SUP>−1</SUP> at a current density of 20 A g<SUP>−1</SUP>. The energy density of the porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet was 19.65 Wh kg<SUP>−1</SUP> at a power density of 124.85 W kg<SUP>−1</SUP> and it was reduced to 10.22 Wh kg<SUP>−1</SUP> at a power of density of 5.00 kW kg<SUP>−1</SUP>. The good electrochemical capacitance is ascribed to the interconnected porous structure of the Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet, which facilitates electrolyte diffusion and enhances electron transport. The porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays on nickel foam are a promising electrode material for supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays on nickel foam are synthesized via solution process followed with an annealing treatment. </LI> <LI> It directly utilizes as electrode materials for pseudocapacitors. </LI> <LI> A specific capacitance of 566.6 F g<SUP>−1</SUP> is achieved at a current density of 0.5 A g<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>