Mn-doped activated carbon aerogel as electrode material for pseudo-capacitive supercapacitor: Effect of activation agent

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P><P>Carbon aerogel (CA) was prepared by a sol-gel polymerization of resorcinol and formaldehyde, and a series of activated carbon aerogels (ACA-X, <I>X</I> = H<SUB>3</SUB>PO<SUB>4</SUB>, K<SUB>2</SUB>CO<SUB>3</SUB>, KOH, and ZnCl<SUB>2</SUB>) were then prepared by a chemical activation using different activation agent (<I>X</I> represented an activation agent). Specific capacitances of activated carbon aerogels were measured by cyclic voltammetry and galvanostatic charge/discharge methods in 6 M KOH electrolyte. Among the samples prepared, ACA-K<SUB>2</SUB>CO<SUB>3</SUB> showed the highest specific capacitance (152 F/g). In order to combine excellent electrochemical performance of activated carbon aerogel with pseudo-capacitive property of manganese oxide, 7 wt% manganese oxide was doped on activated carbon aerogels (Mn/ACA-X) by an incipient wetness impregnation method. Capacitance measurements revealed that Mn/ACA-K<SUB>2</SUB>CO<SUB>3</SUB> showed the highest specific capacitance (189 F/g). The enhanced capacitance of Mn/ACA-K<SUB>2</SUB>CO<SUB>3</SUB> was attributed to the fine pore structure and outstanding electric properties of activated carbon aerogel as well as the faradaic redox reactions of manganese oxide.</P> <P><B>Highlights</B></P><P>► Activated carbon aerogels (ACA-X, <I>X</I> = H<SUB>3</SUB>PO<SUB>4</SUB>, K<SUB>2</SUB>CO<SUB>3</SUB>, KOH, ZnCl<SUB>2</SUB>) were prepared. ► Manganese oxide supported on ACA-X (Mn/ACA-X) was prepared. ► Among ACA-X, ACA-K<SUB>2</SUB>CO<SUB>3</SUB> showed the highest specific capacitance. ► Among Mn/ACA-X, Mn/ACA-K<SUB>2</SUB>CO<SUB>3</SUB> showed the highest specific capacitance.</P>