Asymmetric Paper Supercapacitor Based on Amorphous Porous Mn₃O₄ Negative Electrode and Ni(OH)₂ Positive Electrode: A Novel and High-Performance Flexible Electrochemical Energy Storage Device

Here we synthesize novel asymmetric all-solid-state paper supercapacitors (APSCs) based on amorphous porous Mn₃O₄ grown on conducting paper (NGP) (Mn₃O₄/NGP) negative electrode and Ni­(OH)₂ grown on NGP (Ni­(OH)₂/NGP) as positive electrode, and they have attracted intensive research interest owing to their outstanding properties such as being flexible, ultrathin, and lightweight. The fabricated APSCs exhibit a high areal <i>C</i>_sp of 3.05 F/cm³ and superior cycling stability. The novel asymmetric APSCs also exhibit high energy density of 0.35 mW h/cm³, high power density of 32.5 mW/cm³, and superior cycling performance (