Electrosynthesis of Pd Single-Crystal Nanothorns and Their Application in the Oxidation of Formic Acid

Abstract

With a square wave electrochemical reduction method, Pd single-crystal nanothorns (Pd NTs) are prepared at room temperature, without template or surfactant. By varying the potentials applied, we can control the length and accumulation state of the Pd NTs. TEM study shows that the growth of the thorn occurs along the (22 j 0) plane. The nanothorn is made by a succession of epitaxic dodecahedrons of decreasing sizes aligned in the direction of the (111) plane. The surface chemical state of the Pd NTs is studied with XPS. Pd NTs have higher catalytic activity than commercial Pd black for the oxidation of formic acid.

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

“…Therefore, the 1-D structures are also intensively studied. Meng et al [18,19] synthesized Pd single-crystal nanothorns along the <220> direction with a square wave electrochemical reduction method as shown in Figure 3. The nanothorn was made by a succession of epitaxic dodecahedrons of decreasing sizes aligned in the direction of the (111) plane and the growth of the thorn occurs along the (220) plane.…”

Electrochemical fabrication of multiplicate palladium hierarchical architectures and their electrocatalysis toward oxidation of formic acid

“…Figure 7 shows the CVs of the FA oxidation on Pd catalysts with different morphologies. All of the four curves show obvious oxidation peaks and minor hump at around 0.6 V between the positive potential excursions, which are related to the direct oxidation of FA and the oxidation of Pd [12]. The start potential was signed out.…”

“…It is considered that the morphology of nanoparticles determined the catalytic activity of products. Many kinds of Pd materials, including nanoparticles, nanorods [9], nanocubes [10], nanowires [11], nanoflowers [3], nanothorns [12], tetrahexahedral nanocrystals [13], and dendritic nanowires [14] were synthesized by various chemical and physical methods; however, only a few studies were relative to electrochemical approaches. Actually, electrochemical deposition is a convenient, environmental friendly, and time-saving method.…”

Enhanced electrocatalytic activity of platinum nanoparticles supported on nitrogen-modified mesoporous carbons for methanol electrooxidation

“…The electrochemical surface area (ECSA) was determined by CVs of the hydrogen absorption-desorption in 0.5 M H 2 SO 4 solution. The oxidation charges of monolayer adsorption of hydrogen on Pt surface are assumed to be 210 mC cm À2 [25]. Before testing, high purity N 2 was used for deaeration of the solution.…”