The Oxygen Reduction Reaction on Pt Single Crystal Electrodes Modified with Aromatic Organic Molecules

Takeda, Tomoki; Nakamura, Masashi; Hoshi, Nagahiro

doi:10.5796/electrochemistry.17-00108

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…The influence of adsorbed neutral molecules with high molecular weight on ORR was explored by Hoshi and co-workers. The authors studied the effect of the irreversible adsorption of aromatic organic molecules [31], melanine [32] and alkyl amines [33,34] on Pt single crystal electrodes. The presence of those molecules, in general, leads for the increase in ORR activity after modification.…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

The role of adsorbates in electrocatalytic systems: An analysis of model systems with single crystals

Angelucci

Souza-Garcia

Feliú

2021

Current Opinion in Electrochemistry

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Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

The role of adsorbates in electrocatalytic systems: An analysis of model systems with single crystals

Angelucci

Souza-Garcia

Feliú

2021

Current Opinion in Electrochemistry

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“…10 A wide variety of ionic liquids, featuring elaborate structures containing hydrophobic and amine groups, have also been tested. [11][12][13][14][15][16] However, the efforts are hindered by a lack of understanding on the mechanism for such enhancements.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Oxygen Reduction Reaction by Anchoring Proton Close to the Electrode Surface

Xu,

Tang,

Pan

et al. 2024

Preprint

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Protic ionic liquid, when added to the solution in an electrochemical cell, can enhance the electrocatalytic activity for processes involving proton transfer. Impressive promotion has been reported for the sluggish oxygen reduction reaction (ORR), a key step in the fuel cell technology. However, a lack of understanding on the mechanism has hindered the rational molecular design for such enhancement. Herein, we report the measured ORR promotion effects on Pt(111) in acid solution for a series of molecules, each with the same piperidine ring and with only one amine group slightly modified to vary its structure. Comparisons among this series show that the deciding mechanistic factor is the anchoring of proton on the amine bridge, which then acts as a proton source close to the electrode surface for proton coupled electron transfer channels. Our results show a fundamental aspect of solvated proton in electrochemical processes: its mobility in the electrified double layer can slow down or even inhibit the proton transfer to the electrode, especially at high electrode potential. This problem can be addressed on the solution side by using protic ionic liquid as proton anchors.

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“…And we are also studying the ORR on well-defined Pt, Pt alloy and core-shell model electrodes modified with other organic molecules such as aromatic organic molecules. 79 …”

Section: Enhancement Of the Orr Activity On Single Crystalmentioning

confidence: 99%

Elucidation of Activity Enhancement Factors for the Oxygen Reduction Reaction on Platinum and Palladium Single Crystal Electrodes

Hoshi

Nakamura

2018

Electrochemistry

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This headline article focuses on the oxygen reduction reaction (ORR), cathodic reaction of fuel cells, on well-defined high index planes of Pt and Pd for the elucidation of factors enhancing the activity for the ORR. The surfaces with (111) terrace edge have high activity for the ORR on Pt electrodes. Pt(331) = 3(111)- (111) gives the highest activity for the ORR in the stepped surfaces of Pt. Incorporation of one kink atom among eleven step atoms further enhances the activity of Pt(331). On single crystal electrodes of Pd, however, terrace edge deactivates the ORR and wide (100) terrace enhances the activity. Effects of Pt oxides (PtOH and PtO) on the ORR have been examined using vibrational spectroscopy. Infrared reflection absorption spectroscopy (IRAS) shows that PtOH prevents the ORR on Pt electrodes. Nanoparticle surface enhanced Raman spectroscopy (NPSERS) indicates that PtO also blocks the ORR on Pt(100) of which ORR activity is the lowest. The ORR activity of Pt is also enhanced by the modification of the surfaces by amines with long alkyl chains such as octylamine (OA) and amine with pyrene ring (PA). Modification by OA/PA increases the ORR activity on n(111)-(111) surfaces of Pt with terrace atomic rows more than 7. The activity of flat Pt(111) is enhanced most remarkably by OA/PA. However, the ORR of Pt(100), of which surface is also composed of flat terrace, is deactivated significantly.

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The Oxygen Reduction Reaction on Pt Single Crystal Electrodes Modified with Aromatic Organic Molecules

Cited by 4 publications

References 22 publications

The role of adsorbates in electrocatalytic systems: An analysis of model systems with single crystals

The role of adsorbates in electrocatalytic systems: An analysis of model systems with single crystals

Enhancing the Oxygen Reduction Reaction by Anchoring Proton Close to the Electrode Surface

Elucidation of Activity Enhancement Factors for the Oxygen Reduction Reaction on Platinum and Palladium Single Crystal Electrodes

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