Enhanced oxygen reduction reaction performance of size-controlled Pt nanoparticles on polypyrrole-functionalized carbon nanotubes

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

doi:10.1039/c9dt00158a

Cited by 17 publications

(24 citation statements)

References 35 publications

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“…In addition to the N-doping method, a polymer-coating method with nitrogen-containing polymers has been studied for Pt nanoparticles. − For example, polybenzimidazole (PBI) can be uniformly and strongly attached to the surface of carbon materials via the π–π interactions and its nitrogen atoms improve the dispersibility as well as the catalytic activity of Pt nanoparticles immobilized. − This PBI-coating method also creates a stable interfacial adhesion with Nafion via the acid–base interactions, giving homogeneous ionomer distribution on the support. − This polymer-coating approach has been applied to simple metal nanoparticles. However, there is a lack of studies for Pt–M alloy (M = Ni, Co, Pd) nanostructured electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Electronic Effects of Nitrogen Atoms of Supports on Pt–Ni Rhombic Dodecahedral Nanoframes for Oxygen Reduction

Kato¹,

Nakahoshiba²,

Ogura³

et al. 2020

ACS Appl. Energy Mater.

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Pt-based nanostructures immobilized on carbon supports have been widely used as electrocatalysts. Their catalytic activity can be improved by support modification including nitrogen doping and coating with nitrogen-containing polymers, where nitrogen atoms possibly interact with surface Pt atoms at a catalyst/support interface. To understand electronic effects of nitrogen-doped and polymer-coated carbon supports on the catalytic activity of Pt-based nanostructured catalysts, we prepared Pt 3 Ni nanoframes (NFs) supported on polybenzimidazole (PBI)-coated and uncoated carbon nanotubes for the oxygen reduction reaction (ORR), and then compared their catalytic activities and electronic properties with those of NFs immobilized on nitrogen-doped and undoped carbon supports. Although both PBI-coating and nitrogen-doping approaches improved the catalytic activity of NFs, ex situ X-ray photoelectron spectroscopy and in situ X-ray absorption spectroscopy revealed that nitrogen doping showed electronic effects on NFs, whereas PBI-coating showed almost no impact on the electronic state of NFs but stabilized Pt(OH) ad species under electrochemical conditions. Our studies demonstrate that difference in microscopic environments of nitrogen atoms at the catalyst/ support interface is highly sensitive to the electronic effects of supports on Pt-based electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Electronic Effects of Nitrogen Atoms of Supports on Pt–Ni Rhombic Dodecahedral Nanoframes for Oxygen Reduction

Kato¹,

Nakahoshiba²,

Ogura³

et al. 2020

ACS Appl. Energy Mater.

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“…Numerous strategies involving platinum (Pt) nanoparticle catalysts on carbon supports (Pt/C) have been explored to improve the cathode catalytic performance (oxygen reduction reaction (ORR)) of Pt nanoparticles for polymer electrode fuel cells. − For instance, various methods for the size regulation of Pt nanoparticles/nanoclusters, , structural or morphological control of Pt nanoparticles, − ,− alloying of other metal species to Pt nanoparticles, − ,,,− and surface modification with organic molecules/polymers − or metal oxides/oxinitrides/nitrides/chalcogenides, − ,− as well as combinations of these methods, have been reported to increase the ORR activity of Pt nanoparticle catalysts.…”

Section: Introductionmentioning

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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“…As expected from the result of ESCA, low mass activity was observed probably due to the existence of a buried Pt species in pyrolyzed fullerenol matrix. In sharp contrast, the specific activity was higher than that of a reported Pt/C catalyst (170 μA cm Pt −2 , TEC10E50) [18] . This result indicates that Pt:C60 300 catalyst has intrinsically high catalytic activity, and it is expected that improving the low ECSA would lead to the creation of practical catalysts in the future.…”

Section: Resultsmentioning

confidence: 76%

Synthesis and Pyrolysis of Fullerenol‐stabilized Pt Nanocolloids as a unique Approach to Pt‐doped Carbon

Cabello

Uetake

et al. 2021

Chemistry An Asian Journal

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An aqueous colloidal dispersion of Pt nanoparticles (NPs) stabilized by fullerenol C60(OH)12 (Pt:C60(OH)12) was successfully synthesized via liquid‐phase chemical reduction. The subsequent pyrolysis of Pt:C60(OH)12 at different temperatures was conducted to afford Pt‐doped carbon with different chemical compositions (Pt:C60n). X‐ray absorption spectroscopy (XAS) and Infrared (IR) absorption spectroscopy and thermogravimetric measurements revealed that the thus‐prepared nanocomposite consists of Pt NPs and high valent Pt‐C60(OH)12 complex. One distinct feature of C60(OH)12 matrix as catalyst support is the suppression of size growth of Pt NPs during the pyrolysis up to 300 °C. Electrochemical experiments using cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were performed to find that Pt:C60300 (pyrolyzed at 300 °C) exhibited higher activity than others, that was attributed to the π‐extended feature of the as‐obtained carbon.

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Enhanced oxygen reduction reaction performance of size-controlled Pt nanoparticles on polypyrrole-functionalized carbon nanotubes

Abstract: Enhanced oxygen reduction reaction performances were achieved on size-controlled Pt nanoparticle catalysts prepared by the copolymerization of a Pt4-pyrrole complex and pyrrole monomer in the presence of multi-wall carbon nanotubes.

Cited by 17 publications

References 35 publications

Electronic Effects of Nitrogen Atoms of Supports on Pt–Ni Rhombic Dodecahedral Nanoframes for Oxygen Reduction

Electronic Effects of Nitrogen Atoms of Supports on Pt–Ni Rhombic Dodecahedral Nanoframes for Oxygen Reduction

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

Synthesis and Pyrolysis of Fullerenol‐stabilized Pt Nanocolloids as a unique Approach to Pt‐doped Carbon

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