A Highly Durable Platinum Nanocatalyst for Proton Exchange Membrane Fuel Cells: Multiarmed Starlike Nanowire Single Crystal

Sun, Shuhui; Zhang, Gaixia; Geng, Dongsheng; Chen, Yougui; Li, Ruying; Cai, Mei; Sun, Xueliang

doi:10.1002/anie.201004631

Cited by 358 publications

(224 citation statements)

References 28 publications

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“…The total charges of hydrogen desorption (Q H ) on the electrodes are calculated by integrating desorption peaks after excluding the double layer charging effect. Using the Q H value and the Pt loading, it is possible to calculate the active Pt surface area (S EL ) according to the following formula: 23,54,56 The electrocatalytic activities for ORR of the composite electrodes are compared in Figure 4b by linear scanning voltammetry at a scan rate of 50 mVs ) and 1.02 times higher than that on Pt/TiSi 2 O x -NCNTs (27.7 Ag −1 ). This improvement occurred in spite of a 50% lower Pt active surface area for the Pt/An-TiSi 2 O x -NCNTs compared to Pt/NCNTs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

et al. 2013

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Composite nanostrucutres of TiSi 2 O x coated nitrogen-doped carbon nanotubes (NCNTs) were synthesized by a combination of chemical vapor deposition (CVD) and magnetron sputtering processes. The synthesized nanostructures were used as supports for Pt catalyst for oxygen reduction reaction (ORR) in proton exchange memberane fuel cells (PEMFCs). An amorphous layer of TiSi 2 O x with controlled thicknesses was sputtered on NCNTs and followed by post-treatment at high temperature (1000°C, An-TiSi 2 O x -NCNTs), inducing TiO 2 nanoparticles of around 5 nm in diameter embedded in the amorphous layer. Further analyses via X-ray absorption spectroscopy of the Ti K edge and Si K edge revealed the Ti atoms were in a TiO 2 rutile environment and the Si atoms were in a SiO 2 environment. Pt nanoparticles with an average diameter of 3 nm were deposited on the composite support, and their electrochemical behaviors toward ORR were studied. It was revealed that, even with lower electrochemical surface area (ECSA), Pt/An-TiSi 2 O x -NCNTs showed better catalytic activity toward ORR than Pt/NCNT catalysts. The origin of enhanced activity of Pt/An-TiSi 2 O x -NCNTs was examined by high resolution transmission electron microscopy (HRTEM) and the X-ray absorption near edge structure spectra (XANES) of the deposited Pt nanoparticles.

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Section: ■ Results and Discussionmentioning

confidence: 99%

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

et al. 2013

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“…The lattice contraction will weaken the surface oxygen binding energy and reduce the coverage of intermediate oxygen species, giving rise to the enhanced ORR activity relative to the Pt nanoparticles of Pt/C and the Pt shell on the surface of Pd@Pt NDs [42,43]. Another reason can be ascribed to the relatively smooth surface feature of the NCs compared to that of the Pt/C and Pd@Pt NDs [9,44]. As shown in the TEM and HRTEM images of PdPt NCs (Fig.…”

Section: Electrocatalytic Performancesmentioning

confidence: 97%

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Zhang

Shao

et al. 2013

Electrochimica Acta

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“…We then examined the stability of our octahedral PtxNi1−x/C catalysts by potential cycling between 0.6 and 1.0 V vs. RHE in O2-saturated 0.1 mol L −1 HClO4 solution [31]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction

Thia

Fisher

et al. 2017

Sci. China Mater.

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Controlling the surface structure and composition at the atomic level is an effective way to tune the catalytic properties of bimetallic catalysts. Herein, we demonstrate a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral PtxNi1−x nanoparticles with tunable surface structure and composition. With increasing the Ni content in the bulk composition, the degree of concaveness of the octahedral PtxNi1−x nanoparticles increases. We systematically studied the correlation between their surface structure/composition and their observed oxygen reduction activity. Electrochemical studies have shown that all the octahedral PtxNi1−x nanoparticles exhibit enhanced oxygen reduction activity relative to the state-of-the-art commercial Pt/C catalyst. More importantly, we find that the surface structure and composition of the octahedral PtxNi1−x nanoparticles have significant effect on their oxygen reduction activity. Among the studied PtxNi1−x nanoparticles, the octahedral Pt1Ni1 nanoparticles with slight concaveness in its (111) facet show the highest activity. At 0.90 V vs. RHE, the Pt mass and specific activity of the octahedral Pt1Ni1 nanoparticles are 7.0 and 7.5-fold higher than that of commercial Pt/C catalyst, respectively. The present work not only provides a generalized strategy to synthesize highly monodisperse, surfactant-free octahedral PtxNi1−x nanoparticles with tunable surface structure and composition, but also provides insights to the structure-activity correlation.

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A Highly Durable Platinum Nanocatalyst for Proton Exchange Membrane Fuel Cells: Multiarmed Starlike Nanowire Single Crystal

Cited by 358 publications

References 28 publications

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction

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A Highly Durable Platinum Nanocatalyst for Proton Exchange Membrane Fuel Cells: Multiarmed Starlike Nanowire Single Crystal

Cited by 358 publications

References 28 publications

TiSi2Ox Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

TiSi2Ox Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

Electrochemical preparation and characterization of PdPt nanocages with improved electrocatalytic activity toward oxygen reduction reaction

Octahedral PtNi nanoparticles with controlled surface structure and composition for oxygen reduction reaction

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Product

Resources

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TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs

TiSi₂O_x Coated N-Doped Carbon Nanotubes as Pt Catalyst Support for the Oxygen Reduction Reaction in PEMFCs