Study on the electrodissolution and roughening of a palladium electrode in chloride containing solutions

Chen, Shu; Huang, Wei; Zheng, Jianbin; Li, Zelin

doi:10.1016/j.jelechem.2011.06.008

Cited by 13 publications

(1 citation statement)

References 42 publications

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“…solution (pH 1) and an elevated temperature (70 °C). [52][53][54][55][56][57][58][59] Large particles, however, were formed in the Pt/Pd/C catalyst synthesized by DDR as shown in TEM image in Fig. 3g.…”

Section: Resultsmentioning

confidence: 97%

Electrochemical Properties and Single Cell Performance of Pd Core-Pt Shell Structured Catalyst Synthesized by a Simple Direct Displacement Reaction

Aoki

Inoue

Yoshiura

et al. 2020

J. Electrochem. Soc.

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A carbon supported Pd core-Pt shell structured catalyst (Pt/Pd/C) was synthesized by a very simple direct displacement reaction (DDR), in which Pd core nanoparticles (NPs) were directly displaced with [PtCl4]2− on stirring in N2 saturated H2SO4 aqueous solution at 70 °C instead of a modified Cu under potential deposition (Cu-UPD)/Pt displacement method. In DDR, potential difference between Pd core and [PtCl4]2− was decreased compared with the difference between Cu shell and [PtCl4]2− in Cu-UPD/Pt displacement method, which suppressed non-uniform Pt shell formation and increased Pt shell coverage, enhancing oxygen reduction reaction (ORR) activity. Furthermore, fine Pd core NPs were preferentially dissolved out by Cl− anions released from [PtCl4]2− during DDR performed in acidic H2SO4 solution at 70 °C and mean diameter of Pd@Pt core–shell NPs increased, improving durability of Pt/Pd/C catalyst by the size effect. Large Pd particles, however, were formed in Pt/Pd/C catalyst through a disproportionation reaction of Pd2+ cations generated in DDR, which was suppressed by addition of Br− anions as complexing agent. A single cell using Pt/Pd/C cathode catalyst synthesized by DDR with Br− anions and activated by H2–O2 chemical pretreatment showed 2.4-fold ORR mass activity of a commercially available Pt/C catalyst at a current density of 1.0 A cm−2. Thus, DDR was considered to be a suitable synthetic method for a mass production of highly active and durable Pt/Pd/C catalyst for ORR.

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