Preparation and characterization of PtIr alloy dendritic nanostructures with superior electrochemical activity and stability in oxygen reduction and ethanol oxidation reactions

Lee, Young-Woo; Hwang, Eui-Tak; Kwak, Da-Hee; Park, Kyung-Won

doi:10.1039/c5cy01054c

Cited by 36 publications

(16 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Fig. 3 a, the Pt 4f XPS spectrum can be split into three pairs of peaks: the strongest couple emerged at 71.69 eV (Pt 4f 7/2 ) and 75.21 eV (Pt 4f 5/2 ) corresponds to Pt 0 and the stronger pair presented at 72.52 eV (Pt 4f 7/2 ) and 75.98 eV (Pt 4f 5/2 ) is derived from Pt 2+ , while the weakest pair located at 73.68 eV (Pt 4f 7/2 ) and 77.04 eV (Pt 4f 5/2 ) is assigned to Pt 4+ species 21 . Meanwhile, the Ce 3d XPS spectra in Fig.…”

Section: Resultsmentioning

confidence: 95%

The enhanced activity of Pt–Ce nanoalloy for oxygen electroreduction

Qin

Zhang

Leng

et al. 2020

Sci Rep

View full text Add to dashboard Cite

The widespread use of low-temperature polymer electrolyte membrane fuel cells for clean energy source require significant reductions in the amount of expensive electrocatalyst Pt for the oxygen reduction reaction (ORR). Pt based binary alloys are promising materials for more active and stable electrocatalysts. In this paper, we studied Pt–Ce nanoalloy, which was prepared by hydrogen reduction techniques as ORR electrocatalysts. Among all PtCe alloy catalysts, the PtCe/C-800 ℃ shows superior ORR activity, stability and durability compared to commercial Pt/C. The results presented in this paper will provide the future perspectives to research based on Pt-RE (RE = Ce, Dy, Gd, Er, Sm, and La) alloy as an novel electrocatalyst for various electrocatalytic reactions.

show abstract

Section: Resultsmentioning

confidence: 95%

The enhanced activity of Pt–Ce nanoalloy for oxygen electroreduction

Qin

Zhang

Leng

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…For both samples, the binding energies of the Pt 4f 7/2 and Pt 4f 5/2 doublet, shown in Fig. 5a,d , are characteristic of metallic Pt 13 , 14 . The Co 2p 3/2 peak can be deconvoluted into two components (Fig.…”

Section: Resultsmentioning

confidence: 96%

Shape and Composition Control of Monodisperse Hybrid Pt-CoO Nanocrystals by Controlling the Reaction Kinetics with Additives

Woo

Kim

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Here, we report the effect of Fe(CO)5 additives in the synthesis of branched Pt-CoO nanowires (NWs) and core@shell concave nanocubes (NCs), in a one-pot system. Key to the success of this synthesis is control over the shape of the Pt seeds by controlling the quantity of Fe(CO)5 additive. In the absence of Fe(CO)5, branched Pt-CoO NWs were synthesized through the attachment of small Pt seed particles, followed by the growth of CoO by deposition. On the other hand, Pt@CoO concave NCs were obtained in the presence of Fe(CO)5 because of the stronger adsorption of Co on the Pt (100) surfaces than on the closely packed (111) surfaces. Also, various other conditions including the control of reducing agents, precursor concentrations, and stabilizing agents, were used to verify the effects of reaction kinetics on the synthesis of Pt-CoO nanoparticles. Compared to Pt/graphene oxide (GO) catalyst, branched Pt-CoO NWs supported on GO showed enhanced specific activity toward the oxygen reduction reaction (ORR).

show abstract

“…The peaks at ca. 61.0 (4f 7/2 ) and 64.0 eV (4f 5/2 ) can be attributed to metallic Ir(0) [22], while those at 61.9 (4f 7/2 ) and 64.9 eV (4f 5/2 ) to amorphous hydrous oxides of Ir(IV) [19,22,23,24,25,26,27]. Finally, although the peaks at binding energies of 62.8 and 66.0 eV have not been unanimously distributed to a particular state, they are usually assigned to hydrous Ir oxides in which Ir shows up with many oxidation states Based on the relevant literature the latter couple of peaks can be attributed to Ir(III) [28,29,30], Ir(IV) satellites [29,30,31,32,33,34], or even to higher oxidation states [34,35] such as Ir(V) [36] and Ir(VI) [18,31,37].…”

Section: Resultsmentioning

confidence: 99%

Oxygen Evolution Reaction at IrO2/Ir(Ni) Film Electrodes Prepared by Galvanic Replacement and Anodization: Effect of Precursor Ni Film Thickness

et al. 2019

View full text Add to dashboard Cite

IrO2/Ir(Ni) film electrodes of variable Ni content have been prepared via a galvanic replacement method, whereby surface layers of pre-deposited Ni are replaced by Ir, followed by electrochemical anodization. Electrodeposition of Ni on a glassy carbon electrode support has been carried out at constant potential and the charge of electrodeposited Ni controlled so as to investigate the effect of precursor Ni layer thickness on the electrocatalytic activity of the corresponding IrO2/Ir(Ni)/GC electrodes for the oxygen evolution reaction (OER). After their preparation, these electrodes were characterized by microscopic (SEM) and spectroscopic (EDS, XPS) techniques, revealing the formation of Ir deposits on the Ni support and a thin IrO2 layer on their surfaces. To determine the electroactive surface area of the IrO2 coatings, cyclic voltammograms were recorded in the potential range between hydrogen and oxygen evolution and the charge under the anodic part of the curves, corresponding to Ir surface oxide formation, served as an indicator of the quantity of active IrO2 in the film. The electrocatalytic activity of the coatings for OER was investigated by current–potential curves under steady state conditions, revealing that the catalysts prepared from thinner Ni films exhibited enhanced electrocatalytic performance.

show abstract

Preparation and characterization of PtIr alloy dendritic nanostructures with superior electrochemical activity and stability in oxygen reduction and ethanol oxidation reactions

Abstract: PtIr alloy dendritic nanostructures with high surface area exhibit superior electrocatalytic properties in ethanol oxidation and oxygen reduction reactions.

Cited by 36 publications

References 47 publications

The enhanced activity of Pt–Ce nanoalloy for oxygen electroreduction

The enhanced activity of Pt–Ce nanoalloy for oxygen electroreduction

Shape and Composition Control of Monodisperse Hybrid Pt-CoO Nanocrystals by Controlling the Reaction Kinetics with Additives

Oxygen Evolution Reaction at IrO2/Ir(Ni) Film Electrodes Prepared by Galvanic Replacement and Anodization: Effect of Precursor Ni Film Thickness

Contact Info

Product

Resources

About