Oxygen reduction reaction activity of platinum nanoparticles decorated nitrogen doped carbon in proton exchange membrane fuel cell under real operating conditions

Divya, P.; Ramaprabhu, Sundara

doi:10.1016/j.ijhydene.2016.05.146

Cited by 28 publications

(11 citation statements)

References 41 publications

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“…In the literature, the effect of different nitrogen moieties on doped carbon-supported electrocatalysts is not yet clear. Some recent studies claim an electronic interaction between nitrogen functionalities and platinum, affecting the surface electronic structure of the latter and modifying the adsorption/desorption of oxygen species [ 57 , 58 ]. In our case, the ORR electrochemical activity results evidenced that, the use of N-doped carbon material helps enhancing the activity of the Pt-catalyst, and, this enhancement is more acute when the N-doped CXG possesses a higher amount of N in the form of pyridine and pyrrole.…”

Section: Resultsmentioning

confidence: 99%

N-Doped Carbon Xerogels as Pt Support for the Electro-Reduction of Oxygen

et al. 2017

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Durability and limited catalytic activity are key impediments to the commercialization of polymer electrolyte fuel cells. Carbon materials employed as catalyst support can be doped with different heteroatoms, like nitrogen, to improve both catalytic activity and durability. Carbon xerogels are nanoporous carbons that can be easily synthesized in order to obtain N-doped materials. In the present work, we introduced melamine as a carbon xerogel precursor together with resorcinol for an effective in-situ N doping (3-4 wt % N). Pt nanoparticles were supported on nitrogen-doped carbon xerogels and their activity for the oxygen reduction reaction (ORR) was evaluated in acid media along with their stability. Results provide new evidences of the type of N groups aiding the activity of Pt for the ORR and of a remarkable stability for N-doped carbon-supported Pt catalysts, providing appropriate physico-chemical features.

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Section: Resultsmentioning

confidence: 99%

N-Doped Carbon Xerogels as Pt Support for the Electro-Reduction of Oxygen

et al. 2017

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“…5,6 Moreover, the ORR catalytic activity of Pt and Pt–Ni alloy nanoparticles is enhanced by the immobilization on NC materials. 4,7−19 Theoretical studies have also suggested that nitrogen-doping of carbon nanosheets increases the total metal/support interactions, including dispersive and covalent interactions with Pt nanoparticles (>1 nm); however, this is not the case for oxygen- and sulfur-doping. 20 These results motivated us to choose NC supports in this work.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Electrocatalytic Oxygen Reduction Activity and Durability of Pt–Ni Rhombic Dodecahedral Nanoframes by Anchoring to Nitrogen-Doped Carbon Support

Kato¹,

Ogura²,

Nakagawa³

et al. 2018

ACS Omega

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Pt-based nanostructured electrocatalysts supported on carbon black have been widely studied for the oxygen reduction reaction (ORR), which occurs at the cathode in polymer electrolyte fuel cells. Because sluggish ORR kinetics are known to govern the cell performance, there is a need to develop highly active and durable electrocatalysts. The ORR activity of Pt-based electrocatalysts can be improved by controlling their morphology and alloying Pt with transition metals such as Ni. Improving the catalyst durability remains challenging and there is a lack of catalyst design concepts and synthetic strategies. We report the enhancement of the ORR activity and durability of a nanostructured Pt–Ni electrocatalyst by strong metal/support interactions with a nitrogen-doped carbon (NC) support. Pt–Ni rhombic dodecahedral nanoframes (NFs) were immobilized on the NC support and showed higher ORR electrocatalytic activity and durability in acidic media than that supported on a nondoped carbon black. Durability tests demonstrated that NF/NC showed almost no activity loss even after 50 000 potential cycles under catalytic conditions, and the Ni dissolution from the NFs was suppressed at the NC support, as confirmed by energy dispersive X-ray spectroscopy analysis. Physicochemical measurements including surface-enhanced infrared absorption spectroscopy of surface-adsorbed CO revealed that the strong metal/support interactions of the NF with the NC support caused the downshift of the d-band center position of the surface Pt. Our findings demonstrate that tuning the electronic structure of nanostructured Pt alloy electrocatalysts via the strong metal/support interactions with heteroatom-doped carbon supports will allow the development of highly active and robust electrocatalysts.

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“…The electrochemical results measured by half-cell are summarized in Table S5. It is notable that the CoN–Pt/CoNC-2D possesses a comparable or higher ECSA and lower Tafel plots compared to those of previous related Pt-based catalysts in acidic media, but it exhibits a relatively lower specific activity and mass activity in half-cell measurements, which could be due to a relatively higher catalyst loading in the working electrode for the CoN–Pt/CoNC-2D. ,,,, …”

Section: Resultsmentioning

confidence: 87%

“…The electrochemical surface area (ECSA, m 2 g Pt –1 ) of the as-prepared catalyst was determined by the cyclic voltammogram in the range of hydrogen adsorption onto the Pt surface by using the following equation: where Q H is a total charge density of hydrogen desorption (mC cm –2 ), m is a Pt loading in as-prepared catalyst (g m –2 ), and 0.21 represents the charge required to oxidize a monolayer of atomic hydrogen on the Pt surface (mC cm –2 ) …”

Section: Methodsmentioning

confidence: 99%

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co–N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

Tran

Lee

Park

et al. 2020

ACS Appl. Energy Mater.

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Herein, an oxygen reduction reaction (ORR) catalyst consisting of CoN-decorated Pt nanoparticles (NPs) on thin two-dimensional (2D) nanosheet-structured Co–N-doped porous carbon is prepared by utilizing the pyrolyzed nanosheet-shaped Co-based metal–organic framework as a template for Pt deposition. After Pt deposition and acid leaching, the remaining Co species on the Pt surface are converted to CoN species by ammonia heat treatment, which are also attached on the Pt surface. The as-synthesized CoN-decorated Pt on the Co–N-functionalized 2D carbon (CoN–Pt/CoNC-2D) displays an excellent ORR activity, better than a commercial Pt/C in half-cell and single-cell tests, and also exhibits remarkable long-term durability with only a ∼17 mV shift in half-wave potential after 30 000 potential cycles. Such excellent ORR catalytic performance is attributed to strong cooperative synergistic interactions between the CoN–Pt and CoNC-2D in the catalyst. The CoN species formed on the Pt surface not only change the Pt electronic structure by down-shifting the Pt d-band center but also passivate the Pt surface to prevent Pt oxidation and dissolution during the ORR. On the other hand, the thin porous CoNC-2D nanoflake support significantly improves the accessibility of reactants to enhance mass transfer and prevents segregation and agglomeration of CoN–Pt NPs during the ORR through strong metal–support interaction, further enhancing ORR activity and durability of the CoN–Pt/CoNC-2D catalyst.

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Oxygen reduction reaction activity of platinum nanoparticles decorated nitrogen doped carbon in proton exchange membrane fuel cell under real operating conditions

Cited by 28 publications

References 41 publications

N-Doped Carbon Xerogels as Pt Support for the Electro-Reduction of Oxygen

N-Doped Carbon Xerogels as Pt Support for the Electro-Reduction of Oxygen

Enhancement of Electrocatalytic Oxygen Reduction Activity and Durability of Pt–Ni Rhombic Dodecahedral Nanoframes by Anchoring to Nitrogen-Doped Carbon Support

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co–N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

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