In an embodiment, the present disclosure pertains to a method of creating a supercapacitor. The method includes forming an anode and a cathode, each composed of a substrate having at least one of a lignin, a lignin-based composite, activated carbon, a plant extract, a cellulose by-product, biofuel waste, one or more metals, a metal oxide, a monometallic tungstate, or a bimetallic tungstate, and sandwiching an electrolyte coated separator between the anode and the cathode. In an addition embodiment, the present disclosure pertains to an electrode composed of a particle-decorated lignin. In some embodiments, the particle-decorated lignin includes particles that can include, without limitation, MnO2, NiWO4, MnO2, NiCoWO4, CoWO4, and combinations thereof. In a further embodiment, the present disclosure pertains to a supercapacitor made via the methods of the present disclosure.