Enhancement of Oxygen Reduction Reaction Activity of Pd Core-Pt Shell Structured Catalyst on a Potential Cycling Accelerated Durability Test

Aoki, Naoya; Inoue, Hideo; Okawa, Takashi; Ikehata, Yuta; Shirai, Akira; Doi, Takayuki; Orikasa, Yuki; Uchimoto, Yoshiharu; Jinnai, Hiroshi; Inamoto, Shin; Otsuka, Yuji; Inaba, Masaaki

doi:10.1007/s12678-017-0399-1

Cited by 18 publications

(30 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1B(d It was demonstrated that an HAP composed of a certain kind of potential cycling increases the ORR activity of the Pt/ Pd core−shell catalyst. 28,29 The effects of HAP are summarized in refs. 28,29 The main benefit of the HAP is thickening the Pt shell.…”

Section: Resultsmentioning

confidence: 99%

“…28,29 The effects of HAP are summarized in refs. 28,29 The main benefit of the HAP is thickening the Pt shell. Besides, it was reported that HAP treatment decreases the defects of the NPs, which decrease the ORR activity and increase the ratio of a Pt(111) facet, which is responsible for high activity of Pt.…”

Section: Resultsmentioning

confidence: 99%

“…39 No other step is needed in contrast to the Cu-UPD method, in which Cu is deposited on the Pd surface, and the deposited Cu surface is replaced by Pt. 28 In the DDR method, it is of great importance to use a Pd/C core without fine Pd nanoparticles (NPs) to suppress the For the preparation of Pt/Pd/C, the same DDR method was applied to Pd/C cores with and without fine Pd NPs to examine the effect of the presence of fine Pd NPs. The Pd/C core (300 mg; ISHIFUKU Metal Industry) was dispersed in 200 mL of H 2 SO 4 aqueous solution (pH 1) in a 300 mL separable flask at 5 °C under the bubbling of N 2 gas at 500 mL min −1 .…”

Section: Methodsmentioning

confidence: 99%

“…21 Conventionally, a Pt ML shell was formed on the surface of a carbon-supported Pd core (Pd/C) through Cu under-potential deposition (Cu-UPD) and galvanic displacement reaction of Cu with Pt to give a Pt/Pd/C core−shell-structured catalyst. 28,32 Recently, instead of the Cu-UPD method, Aoki et al developed a very simple method for the synthesis of Pt/ Pd/C catalysts using a direct displacement reaction (DDR), in which the Pd/C core was dispersed in H 2 SO 4 aqueous solution and the surface of the Pd core was spontaneously displaced with a Pt precursor (K 2 PtCl 4 ) on stirring at 70 °C. 31 The Pt/ Pd/C catalyst showed a higher ORR activity than the catalyst prepared by the conventional Cu-UPD method because a nonuniform Pt shell formed in the conventional Cu-UPD method was well suppressed in the DDR method and the Pt shell coverage increased in the catalyst prepared by the DDR method.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Creation of a Highly Active Pt/Pd/C Core–Shell-Structured Catalyst by Synergistic Combination of Intrinsically High Activity and Surface Decoration with Melamine or Tetra-(tert-butyl)-tetraazaporphyrin

et al. 2020

Self Cite

View full text Add to dashboard Cite

A Pt/Pd/C core−shell-structured catalyst with an extraordinarily high activity of 3625 A g −1 -Pt at 0.9 V versus a reversible hydrogen electrode (RHE) for the oxygen reduction reaction (ORR) was created by a synergistic combination of intrinsically high activity and surface decoration with melamine or tetra-(tert-butyl)-tetraazaporphyrin (tBuTAP). The intrinsically highly active Pt/Pd/C catalyst with an ORR mass activity of ca. 1000 A g −1 -Pt at 0.9 V versus RHE was synthesized by a direct displacement reaction method, and the activity was activated to ca. 1500 A g −1 -Pt via a high activation protocol (HAP) (a rectangular potential cycling of 0.05−1.0 V vs an RHE conducted in 0.1 mol dm −3 HClO 4 under an Ar atmosphere at 80 °C). The ORR activities of the Pt/Pd/C catalysts were further increased by surface decoration with melamine or tBuTAP, and the mass activity of ORR of the catalyst activated by an HAP was enhanced to 3625 A g −1 -Pt at 0.9 V versus RHE via the melamine decoration, which is about 11-fold that of a reference Pt/C catalyst (320 A g −1 -Pt). Cyclic voltammograms, linear sweep voltammograms, and CO stripping voltammograms indicated that the surface decoration further destabilized the OH species (OH ad ) adsorbed on the Pt shell and suppressed the formation of oxide on the Pt shell, which could explain the extraordinary enhancement of ORR activity. We present guidelines for creating Pt-based catalysts with extraordinarily high activity for the ORR by the synergistic combination of the intrinsically active Pt-based catalyst [improvement from the inside of Pt nanoparticles (NPs)] and surface decoration (improvement from the outside of Pt NPs).

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Creation of a Highly Active Pt/Pd/C Core–Shell-Structured Catalyst by Synergistic Combination of Intrinsically High Activity and Surface Decoration with Melamine or Tetra-(tert-butyl)-tetraazaporphyrin

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…60 Practical Pd core Pt shell nanoparticles also give higher activity and durability for the ORR than TEC10E50E. 61 …”

Section: Orr On Bare Single Crystal Electrodes Of Ptmentioning

confidence: 99%

Elucidation of Activity Enhancement Factors for the Oxygen Reduction Reaction on Platinum and Palladium Single Crystal Electrodes

Hoshi

Nakamura

2018

Electrochemistry

View full text Add to dashboard Cite

This headline article focuses on the oxygen reduction reaction (ORR), cathodic reaction of fuel cells, on well-defined high index planes of Pt and Pd for the elucidation of factors enhancing the activity for the ORR. The surfaces with (111) terrace edge have high activity for the ORR on Pt electrodes. Pt(331) = 3(111)- (111) gives the highest activity for the ORR in the stepped surfaces of Pt. Incorporation of one kink atom among eleven step atoms further enhances the activity of Pt(331). On single crystal electrodes of Pd, however, terrace edge deactivates the ORR and wide (100) terrace enhances the activity. Effects of Pt oxides (PtOH and PtO) on the ORR have been examined using vibrational spectroscopy. Infrared reflection absorption spectroscopy (IRAS) shows that PtOH prevents the ORR on Pt electrodes. Nanoparticle surface enhanced Raman spectroscopy (NPSERS) indicates that PtO also blocks the ORR on Pt(100) of which ORR activity is the lowest. The ORR activity of Pt is also enhanced by the modification of the surfaces by amines with long alkyl chains such as octylamine (OA) and amine with pyrene ring (PA). Modification by OA/PA increases the ORR activity on n(111)-(111) surfaces of Pt with terrace atomic rows more than 7. The activity of flat Pt(111) is enhanced most remarkably by OA/PA. However, the ORR of Pt(100), of which surface is also composed of flat terrace, is deactivated significantly.

show abstract

Core–Shell Functional Materials for Electrocatalysis

Fan

et al. 2021

Core-Shell and Yolk-Shell Nanocatalysts

View full text Add to dashboard Cite

Enhancement of Oxygen Reduction Reaction Activity of Pd Core-Pt Shell Structured Catalyst on a Potential Cycling Accelerated Durability Test

Cited by 18 publications

References 40 publications

Creation of a Highly Active Pt/Pd/C Core–Shell-Structured Catalyst by Synergistic Combination of Intrinsically High Activity and Surface Decoration with Melamine or Tetra-(tert-butyl)-tetraazaporphyrin

Creation of a Highly Active Pt/Pd/C Core–Shell-Structured Catalyst by Synergistic Combination of Intrinsically High Activity and Surface Decoration with Melamine or Tetra-(tert-butyl)-tetraazaporphyrin

Elucidation of Activity Enhancement Factors for the Oxygen Reduction Reaction on Platinum and Palladium Single Crystal Electrodes

Core–Shell Functional Materials for Electrocatalysis

Contact Info

Product

Resources

About