Worm-Like Palladium/Carbon Core—Shell Nanocomposites: One-Step Hydrothermal Reduction-Carbonization Synthesis and Electrocatalytic Activity

摘要

Worm-like palladium /carbon (Pd/C) core-shell nanocomposites have been hydrothermally prepared starting from PdCl2 and α-lactose monohydrate (α-LM) in the presence of polyacrylamide (PAM) at 200 °C. The thickness of carbonaceous shells varied from 5 to 45 nm with increasing temperature from 140 to 200 °C. When the dose of PAM or PdCl2 was increased, spherical Pd/C core—shell nanocomposites were obtained. Time-dependent experiments confirmed that formation of Pd/C core—shell nanocomposites underwent an entrapment—reduction—carbonization process. Such a route has also been extended to synthesize spherical Ag/C core—shell composites. A cyclic voltammetry (CV) study reveals that the as-prepared Pd/C core—shell nanocomposites exhibit electrocatalytic activity toward oxidation of ascorbic acid (AA).