Improving platinum catalyst binding energy to graphene through nitrogen doping

Groves, Michael N.; Chan, Anita S.W.; Malardier-Jugroot, Cécile; Jugroot, Manish

doi:10.1016/j.cplett.2009.09.074

Cited by 175 publications

(135 citation statements)

References 30 publications

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“…Heteroatom doping in carbon nanotubes has shown to greatly improve the electrocatalytic activity [57,58,129,130]. This strategy has been applied in graphene-based material synthesis [131 -134] and theoretical study [135], but no reports are available on electrochemical study. Nitrogen doping usually takes place at high temperatures (600 -1000 8C) [59], for example, with ammonia oxidation/heat-treatment, which makes graphene to restack more easily.…”

Section: Concluding Remarks and Future Directionsmentioning

confidence: 99%

Graphene Based Electrochemical Sensors and Biosensors: A Review

et al. 2010

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Graphene, emerging as a true 2-dimensional material, has received increasing attention due to its unique physicochemical properties (high surface area, excellent conductivity, high mechanical strength, and ease of functionalization and mass production). This article selectively reviews recent advances in graphene-based electrochemical sensors and biosensors. In particular, graphene for direct electrochemistry of enzyme, its electrocatalytic activity toward small biomolecules (hydrogen peroxide, NADH, dopamine, etc.), and graphenebased enzyme biosensors have been summarized in more detail; Graphene-based DNA sensing and environmental analysis have been discussed. Future perspectives in this rapidly developing field are also discussed.

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Section: Concluding Remarks and Future Directionsmentioning

confidence: 99%

Graphene Based Electrochemical Sensors and Biosensors: A Review

et al. 2010

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“…Here we need to stress that Pt coordinates from the available N ligands result in the formation of single-atom sites. [55][56][57][58] These could serve as re-deposition sites at lower potentials. Based on the above results, we also investigated the dissolution behavior under a fast potentiodynamic regime involving cycling between 0.05 and 1.35 V (Fig.…”

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confidence: 99%

Importance of non-intrinsic platinum dissolution in Pt/C composite fuel cell catalysts

Jovanovič

Petek

Hodnik

et al. 2017

Phys. Chem. Chem. Phys.

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The dissolution of different platinum-based nanoparticles deposited on a commercial high-surface area carbon (HSAC) support in thin catalyst films is investigated using a highly sensitive electrochemical flow cell (EFC) coupled to an inductively coupled plasma mass spectrometer (ICP-MS). The previously reported particle-size-dependent dissolution of Pt is confirmed on selected industrial samples with a mean Pt particle size ranging from 1 to 4.8 nm. This trend is significantly altered when a catalyst is diluted by the addition of HSAC. This indicates that the intrinsic dissolution properties are masked by local oversaturation phenomena, the so-called confinement effect. Furthermore, by replacing the standard HSAC support with a support having an order of magnitude higher specific surface area (a micro-and mesoporous nitrogen-doped high surface area carbon, HSANDC), Pt dissolution is reduced even further. This is due to the so-called non-intrinsic confinement and entrapment effects of the (large amount of) micropores and small mesopores doped with N atoms. The observed more effective Pt re-deposition is presumably induced by local Pt oversaturation and the presence of nitrogen nucleation sites. Overall, our study demonstrates the high importance and beneficial effects of porosity, loading and N doping of the carbon support on the Pt stability in the catalyst layer.

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“…[11][12][13][14][15][16][17] We believe that restacking of the suspended graphene sheets as the electrocatalyst ink dries on the electrode is one of the limiting factors of the performance of graphene in PEFCs to date. To retain the large surface area and maximize the triple-phase boundary for the electrochemical oxygen reduction reaction (ORR), some kind of three-dimensional graphene network is required.…”

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Defective Graphene Foam: A Platinum Catalyst Support for PEMFCs

Liu

Daio

Sasaki

et al. 2014

J. Electrochem. Soc.

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Gram-scale synthesis of defective graphene foam from low-cost precursors is reported as a catalyst support material for platinum in fuel cell cathodes. The material was produced by combustion of sodium ethoxide, followed by washing and heat-treatment in various gases. The BET surface area is higher than 1500 m 2 /g. The defects in the material result in excellent distribution of platinum nanoparticles on the surface. The electrochemical performance is compared with platinum-decorated carbon black and commercially obtainable graphene using cyclic voltammetry, linear sweep voltammetry, and membrane electrode assemblies. Pt-decorated graphene foam has larger electrochemical surface area (101 m 2 /g) and higher mass activity (176 A/g Pt ). However, durability and fuel cell power density still require improvements. This graphene foam is a potentially useful catalyst support, especially for use in polymer electrolyte membrane fuel cells.

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Improving platinum catalyst binding energy to graphene through nitrogen doping

Cited by 175 publications

References 30 publications

Graphene Based Electrochemical Sensors and Biosensors: A Review

Graphene Based Electrochemical Sensors and Biosensors: A Review

Importance of non-intrinsic platinum dissolution in Pt/C composite fuel cell catalysts

Defective Graphene Foam: A Platinum Catalyst Support for PEMFCs

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