Engineering PdIr Nanostructures Synergistically Induced by Self-assembled Surfactants and Halide Ions for Alcohol
Ke Guo1, Dongping Fan1, Yixian Teng1
1Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, Jiangsu, 210023, P. R. China.
Abstract:
The design and synthesis of metallic nanocatalysts with distinct nanostructures and composition is still a noteworthy topic in the electrochemistry field. In this work, we have realized the morphological evolution of PdIr nanostructures in aqueous solution through the synergistic effect of self-assembled functional surfactants and different halide ions, and achieved precise control of the kinetic and thermodynamic crystalline growth due to the different reduction potential between PdCl4 2- , PdBr4 2- , and PdI4 2- . The actual precursors of PdCl4 2- resulted in ultrathin nanodendrites, PdClx Br(4-x) 2- for nanosheets and fewer branched nanodendrites, PdClx I(4-x) 2- for nanorings, nanoflowers and multiply concave nanocubes. Owing to the synergistic advantages of structure and composition (alloyed Ir), PdIr nanodendrites exhibited enhanced electrocatalytic activity, anti-poisoning ability, and stability toward alcohols (including ethanol, methanol, and glycerol) electrooxidation reactions. The results would be helpful for thoroughly understanding how structure-directing surfactants and halide ions synergistically determine the production of advanced metallic nanocrystals.
