Enhanced activity and durability of Pt nanoparticles supported on reduced graphene oxide for oxygen reduction catalysts of proton exchange membrane fuel cells

Kim, Jemin; Kim, Sun-I; Jo, Seung Geun; Hong, Na Eun; Ye, Bora; Lee, Sangkyu; Dow, Hwan Soo; Lee, Jun Young; Lee, Jung Woo

doi:10.1016/j.cattod.2019.11.016

Cited by 18 publications

(7 citation statements)

References 24 publications

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“…22,28 cSurface chemical states of Pt was calculated via peak fitting from XPS analysis referring from Kim. 29 dSurface chemical states of Pd was calculated via peak fitting from XPS analysis referring from Lei. 30 eSurface chemical states of Ir was calculated via peak fitting from XPS analysis referring from Xu and Vos.…”

Section: Resultsmentioning

confidence: 99%

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Efficient conversion of lactic acid to alanine over noble metal supported on Ni@C catalysts

et al. 2022

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Section: Resultsmentioning

confidence: 99%

“…cSurface chemical states of Pt was calculated via peak fitting from XPS analysis referring from Kim. 29 …”

Section: Resultsmentioning

confidence: 99%

Efficient conversion of lactic acid to alanine over noble metal supported on Ni@C catalysts

et al. 2022

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“…Pd–Ru NPs/NrGO catalysts were synthesized by a microwave-assisted method [ 16 , 17 , 18 ]. First, 55 mg of NrGO was dispersed in 50 mL of diethylene glycol (DEG, Junsei Chemical Co., Tokyo, Japan) by ultrasonication for 3 h. After that, 0.1 M palladium (II) chloride (PdCl 2 , Wako Chemical Inc., Osaka, Japan) and ruthenium (III) chloride hydrate (RuCl 3 ∙6H 2 O, Sigma-Aldrich Co., Burlington, MA, USA) were added into the solutions, totaling 1 mL in various ratios of 1:0, 4:1, 3:1, 1:1, and 0:1, respectively, to compare the catalytic activity depending on the elemental composition of Pd and Ru.…”

Section: Methodsmentioning

confidence: 99%

Nitrogen-Doped Reduced Graphene Oxide Supported Pd4.7Ru Nanoparticles Electrocatalyst for Oxygen Reduction Reaction

Park

Varyambath

et al. 2021

Nanomaterials

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It is imperative to design an inexpensive, active, and durable electrocatalyst in oxygen reduction reaction (ORR) to replace carbon black supported Pt (Pt/CB). In this work, we synthesized Pd4.7Ru nanoparticles on nitrogen-doped reduced graphene oxide (Pd4.7Ru NPs/NrGO) by a facile microwave-assisted method. Nitrogen atoms were introduced into the graphene by thermal reduction with NH3 gas and several nitrogen atoms, such as pyrrolic, graphitic, and pyridinic N, found by X-ray photoelectron spectroscopy. Pyridinic nitrogen atoms acted as efficient particle anchoring sites, making strong bonding with Pd4.7Ru NPs. Additionally, carbon atoms bonding with pyridinic N facilitated the adsorption of O2 as Lewis bases. The uniformly distributed ~2.4 nm of Pd4.7Ru NPs on the NrGO was confirmed by transmission electron microscopy. The optimal composition between Pd and Ru is 4.7:1, reaching −6.33 mA/cm2 at 0.3 VRHE for the best ORR activity among all measured catalysts. Furthermore, accelerated degradation test by electrochemical measurements proved its high durability, maintaining its initial current density up to 98.3% at 0.3 VRHE and 93.7% at 0.75 VRHE, whereas other catalysts remained below 90% at all potentials. These outcomes are considered that the doped nitrogen atoms bond with the NPs stably, and their electron-rich states facilitate the interaction with the reactants on the surface. In conclusion, the catalyst can be applied to the fuel cell system, overcoming the high cost, activity, and durability issues.

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“…In addition, several studies have reported a reduction in Pt usage and improvements in fuel cell performance with the use of a CNT-supported Pt catalyst. Graphene has also attracted significant attention as a durable catalyst support owing to its high conductivity and large specific surface area [ 14 , 15 , 16 , 17 ]. We had recently reported highly efficient ORR catalysts composed of uniform Pt nanoparticles supported on small rGO (srGO).…”

Section: Introductionmentioning

confidence: 99%

Hybrid Carbon Supports Composed of Small Reduced Graphene Oxide and Carbon Nanotubes for Durable Oxygen Reduction Catalysts in Proton Exchange Membrane Fuel Cells

Bak

Son

Shin

et al. 2022

IJMS

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We demonstrated highly active and durable hybrid catalysts (HCs) composed of small reduced graphene oxide (srGO) and carbon nanotubes (CNTs) for use as oxygen reduction reaction (ORR) catalysts in proton exchange membrane fuel cells. Pt/srGO and Pt/CNTs were prepared by loading Pt nanoparticles onto srGO and CNTs using a polyol process, and HCs with different Pt/CNT and Pt/srGO ratios were prepared by mechanically mixing the two components. The prepared HCs consisted of Pt/CNTs well dispersed on Pt/srGO, with catalyst HC55, which was prepared using Pt/srGO and Pt/CNTs in a 5:5 ratio, exhibiting excellent oxygen reduction performance and high stability over 1000 cycles of the accelerated durability test (ADT). In particular, after 1000 cycles of the ADT, the normalized electrochemically active surface area of Pt/HC55 decreased by 11.9%, while those of Pt/srGO and Pt/C decreased by 21.2% and 57.6%, respectively. CNTs have strong corrosion resistance because there are fewer defect sites on the surface, and the addition of CNTs in rGO further improved the durability and the electrical conductivity of the catalyst. A detailed analysis of the structural and electrochemical properties of the synthesized catalysts suggested that the synergetic effects of the high specific surface area of srGO and the excellent electrical conductivity of CNTs were responsible for the enhanced efficiency and durability of the catalysts.

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Enhanced activity and durability of Pt nanoparticles supported on reduced graphene oxide for oxygen reduction catalysts of proton exchange membrane fuel cells

Cited by 18 publications

References 24 publications

Efficient conversion of lactic acid to alanine over noble metal supported on Ni@C catalysts

Efficient conversion of lactic acid to alanine over noble metal supported on Ni@C catalysts

Nitrogen-Doped Reduced Graphene Oxide Supported Pd4.7Ru Nanoparticles Electrocatalyst for Oxygen Reduction Reaction

Hybrid Carbon Supports Composed of Small Reduced Graphene Oxide and Carbon Nanotubes for Durable Oxygen Reduction Catalysts in Proton Exchange Membrane Fuel Cells

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