A novel asymmetric supercapacitor device for energy storage is fabricated using K 0.3 WO 3 nanorods as negative electrode and nitrogen-doped porous carbon (CBC-1) based on agricultural wastes corn bract as positive electrode. The K 0.3 WO 3 nanorods are composed of some thinner needle-shaped nanorods which are parallel to each other, and the CBC-1 reveals rough surface of coral-like frameworks with abundant nanopores. The structures can provide high surface area, low diffusion paths and intercalation/de-intercalation of electrolyte ions between the electrode/electrolyte interfaces. Thus, the asymmetric supercapacitor exhibits high energy density about 26.3 Wh kg −1 at power density of 404.2 W kg −1 in the wide voltage region of 0–1.6 V, as well as a good electrochemical stability (80% capacitance retention after 1000 cycles). Such outstanding electrochemical behaviors imply the CBC-1//K 0.3 WO 3 asymmetric supercapacitor is a promising practical energy-storage system.
Ma, G., Zhang, Z., Sun, K., Feng, E., Peng, H., Zhou, X., & Lei, Z. (2016). High-performance aqueous asymmetric supercapacitor based on K 0.3 WO 3 nanorods and nitrogen-doped porous carbon. Journal of Power Sources, 330, 219–230. https://doi.org/10.1016/j.jpowsour.2016.09.022