title: Synthesis and electrocatalytic activity of highly porous hollow palladium nanoshells for oxygen reduction in alkaline solution.
abstract: A series of hollow Pd nanoshells are prepared by employing Co nanoparticles as sacrificial templates with different concentrations of a Pd precursor (1, 6, 12, 20, and 40 mM K2PdCl4), denoted hPd-X (X: concentration of K2PdCl4 in mM unit). The synthesized hPd series are tested as a cathodic electrocatalyst for oxygen reduction reaction (ORR) in alkaline solution. The morphology and surface area of the hPd catalysts are characterized using scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and cyclic voltammetry (CV). Rotating disk electrode (RDE) voltammetric studies show that the hPd-20 (prepared using 20 mM K2PdCl4) has the highest ORR activity among all the hPd series, while being comparable to commercial Pd and Pt catalysts (E-TEK). The more facilitated ORR at hPd-20 is presumably induced by the enhanced Pd surface area and efficiently high porosity of Pd nanoshells.
authors.affiliation: Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea.
authors.forename: Yun-Bin
authors.initials: YB
authors.lastname: Cho
authors.forename: Ji Eon
authors.initials: JE
authors.lastname: Kim
authors.forename: Jun Ho
authors.initials: JH
authors.lastname: Shim
authors.forename: Chongmok
authors.initials: C
authors.lastname: Lee
authors.forename: Youngmi
authors.initials: Y
authors.lastname: Lee
mesh_terms: D002384:Catalysis; D003035:Cobalt / Q000737:chemistry; D055664:Electrochemical Techniques; D053768:Metal Nanoparticles / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D010316:Particle Size; D016062:Porosity; D012972:Sodium Hydroxide / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties
chemical_list: D012996:Solutions; D003035:Cobalt; D012972:Sodium Hydroxide; D010165:Palladium; D010100:Oxygen