Biotemplated synthesis of single-crystalline W₁₈O₄₉@C core-shell nanorod and its capacitance properties

Single-crystalline W₁₈O₄₉@C core-shell nanorods were prepared by a simple and economical method using a naturally occurring biopolymer, chitosan, as a template. The core-shell nanorods were characterized by CHN, XRD, BET, SEM, and HRTEM analysis. The HRTEM shows that each-nanorod is made up of bundle of tiny nanorods with diameters of 2-3 nm. The capacitance properties were studied in 1 M H₂SO₄ and 1 M Na ₂SO₄ using cyclic voltammetry. W₁₈O ₄₉@C prepared at 973 K shows higher capacitance compared to W ₁₈O₄₉@C prepared at 1023 K in both acid and aqueous mediums.