Size Regulation and Stability Enhancement of Pt Nanoparticle Catalyst via Polypyrrole Functionalization of Carbon-Nanotube-Supported Pt Tetranuclear Complex

Muratsugu, Satoshi; Miyamoto, Shota; Sakamoto, Kana; Ichihashi, Kentaro; Kim, Chang Kyu; Ishiguro, Nozomu; Tada, Mizuki

doi:10.1021/acs.langmuir.7b02114

Cited by 10 publications

(5 citation statements)

References 62 publications

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“…As shown in Figure , the filtration efficiencies with increased basis weight were 99.838, 99.922, 99.971, 99.986, and 99.991%, and the corresponding pressure drops were 241, 293, 339, 415, and 487 Pa, respectively. The filtration efficiency first rose sharply and later remained steady above the high value of 99.97%, which is the requirement of the high-efficiency particulate air (HEPA) filter standards. , The pressure drop increased linearly, which was consistent with the results reported in the literature . The smaller pressure drop is preferred in practical applications .…”

Section: Resultssupporting

confidence: 86%

“…The Pt crystal sizes were 2.7, 6.5, 8.2, and 26.2 nm when the membranes were calcined at 500, 600, 700, and 800 °C, respectively. It was reported that the nanosized Pt particles show excellent catalytic performance, , and that the catalytic performance is inversely correlated with the particle size . Therefore, the membranes calcined at 500 °C should show excellent catalytic performance characteristics.…”

Section: Resultsmentioning

confidence: 99%

“…41,55 The pressure drop increased linearly, which was consistent with the results reported in the literature. 34 The smaller pressure drop is preferred in practical applications. 41 In terms of the HEPA filter standards and the small pressure drop, the membrane with the basis weight of 11.40 g m −2 exhibited satisfactory filtration performance with 99.971% filtration efficiency and 339 Pa pressure drop.…”

Section: •−mentioning

confidence: 99%

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Novel Flexible Self-Standing Pt/Al₂O₃ Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Wang

Zhan

Song

2018

ACS Appl. Mater. Interfaces

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In spite of intensive research investigating the prevalent Pt/AlO catalysts, achieving macroscopic morphology beyond the powder form limitations remains highly challenging. Meanwhile, current impregnation-based preparation approaches show the drawbacks of tedious procedures and inefficient use of noble metals. Therefore, it is important to search for new methods for the fabrication of Pt/AlO catalysts with a novel morphology. In this study, a novel Pt/AlO nanofibrous membrane catalyst is fabricated via a facile one-pot electrospinning process. The embedding of Pt nanoparticles is performed simultaneously with the formation of AlO nanofibers. The Pt/AlO membranes show remarkable mechanical properties with tensile stresses as high as 44.14 MPa. Notably, the Pt/AlO membranes exhibit multifunctionality with excellent performance characteristics. The catalytic experiments indicate that 100% of bisphenol A is removed within 60 min, and 100% of CO is completely converted to CO at 242 °C when Pt/AlO membranes are used as catalysts. The membranes also exhibit excellent filtration performance, clearly decreasing the turbidity of water, and meet the high efficiency of particulate air filter standards. The excellent flexibility, satisfying mechanical property, and multifunctionality extend the range of potential application of the Pt/AlO membranes. Moreover, the facile synthesis suggests new possibilities for the fabrication of many membrane-form AlO-supported catalysts.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: •−mentioning

confidence: 99%

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Novel Flexible Self-Standing Pt/Al₂O₃ Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Wang

Zhan

Song

2018

ACS Appl. Mater. Interfaces

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“…First, pyrrole monomers were added dropwise to a suspension of MWCNTs in aqueous sodium dodecyl sulfate (SDS) solution, and an acetonitrile solution of a tetranuclear Pt 4 complex with pyrrole units and an acetone solution of tris(2,2,6,6-tetramethyl-3,5-heptanedionato)Gd(III) (Gd(TMHD) 3 ) were successively added. The Pt 4 tetranuclear complex − has been demonstrated to serve as a useful precursor unit for synthesizing Pt nanoparticles. ,− After the addition of aqueous ammonium peroxydisulfate (APS) solution, filtration, and washing, A-Pt-Gd was obtained by evacuation at 573 K followed by reduction with hydrogen. Gd-free Pt nanoparticles on MWCNTs (denoted A-Pt ) were prepared in a similar manner without the addition of Gd(TMHD) 3 .…”

Section: Resultsmentioning

confidence: 99%

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

et al. 2020

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Fine Pt nanoparticles functionalized with Gd 3+ hydroxide/oxide species were prepared on multiwalled carbon nanotubes (MWCNTs) containing polypyrrole matrix overlayers and found to exhibit remarkable electrocatalytic performance in the oxygen reduction reaction (ORR). Characterization via transmission electron microscopy, scanning transmission electron microscopy with electron energy loss spectroscopy, X-ray absorption fine structure, and X-ray photoelectron spectroscopy revealed that the Gd 3+ hydroxide/oxide species were located in close proximity to the Pt 0 nanoparticles on the MWCNTs. The prepared Pt nanoparticle−Gd hydroxide/oxide composites exhibited superior ORR activity to Gd-free Pt nanoparticles prepared in a similar manner, and the decoration with the Gd species suppressed Pt oxidation and accelerated Pt oxide reduction, as demonstrated by cyclic voltammetry and in situ Pt L III -edge X-ray absorption near-edge structure analysis under potential application. The effect of the Gd loading on the ORR performance was also examined, revealing the existence of an optimal Gd loading beyond which further Gd incorporation resulted in aggregation of the Gd 3+ domains and decreased crystallinity of the Pt nanoparticles.

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“…The core process, oxygen reduction reaction (ORR), that determines overall efficiency of fuel cells and metalair batteries is slow, and thus precious metal catalysts including Pt have been widely used to promote this process [7][8][9][10][11][12]. However, the natural abundance of precious metals on earth is scarce, and their electrocatalytic stability for ORR is poor [13][14][15][16][17][18]. Therefore, it is of great significance to develop ORR catalysts with abundant reserves, low cost, and excellent durability.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Structure Controls of Single-Atom Fe–N–C Catalysts Synthesized Using FePc Powders as the Precursor

et al. 2021

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Understanding the origin of the high electrocatalytic activity of Fe–N–C electrocatalysts for oxygen reduction reaction is critical but still challenging for developing efficient sustainable nonprecious metal catalysts used in fuel cells. Although there are plenty of papers concerning the morphology on the surface Fe–N–C catalysts, there is very little work discussing how temperature and pressure control the growth of nanoparticles. In our lab, a unique organic vapor deposition technology was developed to investigate the effect of the temperature and pressure on catalysts. The results indicated that synthesized catalysts exhibited three kinds of morphology—nanorods, nanofibers, and nanogranules—corresponding to different synthesis processes. The growth of the crystal is the root cause of the difference in the surface morphology of the catalyst, which can reasonably explain the effect of the temperature and pressure. The oxygen reduction reaction current densities of the different catalysts at potential 0.88 V increased in the following order: FePc (1.04 mA/cm2) < Pt/C catalyst (1.54 mA/cm2) ≈ Fe–N–C-f catalyst (1.64 mA/cm2) < Fe–N–C-g catalyst (2.12 mA/cm2) < Fe–N–C-r catalyst (2.35 mA/cm2). By changing the morphology of the catalyst surface, this study proved that the higher performance of the catalysts can be obtained.

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Size Regulation and Stability Enhancement of Pt Nanoparticle Catalyst via Polypyrrole Functionalization of Carbon-Nanotube-Supported Pt Tetranuclear Complex

Cited by 10 publications

References 62 publications

Novel Flexible Self-Standing Pt/Al₂O₃ Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Novel Flexible Self-Standing Pt/Al₂O₃ Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

Morphology and Structure Controls of Single-Atom Fe–N–C Catalysts Synthesized Using FePc Powders as the Precursor

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Size Regulation and Stability Enhancement of Pt Nanoparticle Catalyst via Polypyrrole Functionalization of Carbon-Nanotube-Supported Pt Tetranuclear Complex

Cited by 10 publications

References 62 publications

Novel Flexible Self-Standing Pt/Al2O3 Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Novel Flexible Self-Standing Pt/Al2O3 Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Oxygen Reduction Reaction Performance Tuning on Pt Nanoparticle/MWCNT Catalysts by Gd Species

Morphology and Structure Controls of Single-Atom Fe–N–C Catalysts Synthesized Using FePc Powders as the Precursor

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Product

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Novel Flexible Self-Standing Pt/Al₂O₃ Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation

Novel Flexible Self-Standing Pt/Al₂O₃ Nanofibrous Membranes: Synthesis and Multifunctionality for Environmental Remediation