“…3 Electrochemical energy storage devices such as rechargeable batteries and supercapacitors (SCs) are the most promising candidates in energy storage applications. 4,5 Among these storage technologies, supercapacitors have gained widespread research interest due to several highlighted features including high power density, extended shelf life (>10 000 cycles), fast (dis)charge process and being environmentally harmless. However, the lower energy density of supercapacitors hinders their widespread commercial application.…”