Oxygen reduction reaction properties of carbon nanofibers: Effect of metal purification

Zheng, Junsheng; Zhang, Xinsheng; Li, Ping; Zhou, Xin; Chen, De; Liu, Ye; Wang, Yuan

doi:10.1016/j.electacta.2007.11.081

Cited by 20 publications

(2 citation statements)

References 58 publications

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“…and treating with 30% H 2 O 2 solution. 83,84 After the purification process comes the synthesis of the supported GNF catalyst by a wet chemical synthesis process, which involves the precursor, the reducing agent, and the GNF in a liquid solvent. During the synthesis process, it is of paramount importance to attain effective chemical interactions between metal precursors and the GNF support, which consequently alter the deposited crystallize size, lattice parameters, and strength of the nanoparticles' interaction with the support.…”

Section: Strategies For Functionalization Of Carbon Nanofibersmentioning

confidence: 99%

“…It is vital that these metal residues are washed out by a pre-purification process, accomplished mostly by chemical treatment processes include dispersing the CNFs in basic or acidic solutions (HF, HNO 3 , HCl, NaOH, etc.) and treating with 30% H 2 O 2 solution. , After the purification process comes the synthesis of the supported GNF catalyst by a wet chemical synthesis process, which involves the precursor, the reducing agent, and the GNF in a liquid solvent. During the synthesis process, it is of paramount importance to attain effective chemical interactions between metal precursors and the GNF support, which consequently alter the deposited crystallize size, lattice parameters, and strength of the nanoparticles’ interaction with the support. − These chemical interactions between the ionic metal precursors and the GNF support depend on defects and surface functional groups.…”

Section: Strategies For Functionalization Of Carbon Nanofibersmentioning

confidence: 99%

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Carbon Nanofibers as Potential Catalyst Support for Fuel Cell Cathodes: A Review

et al. 2021

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Polymer electrolyte membrane fuel cells (PEMFCs) are a fast growing next-generation energy conversion technology, which hold promising interest for transportation and other applications. Nevertheless, successful commercialization of PEMFCs has been significantly retarded principally due to the high cost and poor durability of Pt/C catalysts used for anodic and cathodic reactions. Under typical fuel cell operating conditions, a traditional Pt/C catalyst is prone to degrade by various mechanisms, such as electrochemical carbon corrosion, which results in detrimental effects on the long-term performance. There have been tremendous efforts undertaken to develop durable carbon supports by introducing graphitic carbon components. In this context, carbon nanofiber supported catalysts have been investigated as highly durable supports for Pt and non-Pt nanoparticles in recent years. We anticipate it is timely to review the developments in this topic. This Review highlights the current progress on the graphitic nanofibers as a catalyst support in terms of morphology, electrocatalytic activity, various functionalization strategies, and so on, specifically focusing on the effect of nanofiber edge carbons and the advantages of surface reconstruction of nanofiber edge carbon into loops with regard to the stability of carbon support and fuel cell performance. We believe this Review stands as a guide for future researchers to figure out a rational design of oxygen reduction reaction catalysts, especially dealing with highly graphitized carbons.

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Section: Strategies For Functionalization Of Carbon Nanofibersmentioning

confidence: 99%

Section: Strategies For Functionalization Of Carbon Nanofibersmentioning

confidence: 99%

Carbon Nanofibers as Potential Catalyst Support for Fuel Cell Cathodes: A Review

et al. 2021

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Density functional theory applied to electrocatalysis

Venkatachalam

Jacob

2010

Handbook of Fuel Cells

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A combination of density functional theory (DFT) and thermodynamic considerations is used to evaluate the electrochemical ( a , T , Δϕ) phase diagram for Pt(111) in contact with an aqueous electrolyte, which is then compared with experimental data. After specifying the electrode potential region at which no surface oxidation or oxide formation occurs, DFT calculations on the reaction of H 2 + 1/2O 2 → H 2 O over a Pt catalyst via direct oxygen reduction are discussed. Within these studies we first examine the binding characteristics and energetics for each likely intermediate chemisorbed on the Pt(111) surface, modeled by a 35‐atom cluster: O, H, O 2 , H 2 , OH, OOH, H 2 O 2 , and H 2 O. Then, the pathways for the dissociation processes of the various intermediates were calculated. Using binding energies and dissociation barriers, two main reaction mechanisms could be distinguished: O 2 dissociation and OOH/H 2 O 2 formation. While the latter one is the only mechanism to be expected when neglecting the surrounding water, both pathways have almost comparable reaction barriers when taking water into account.

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Computational Simulations on the Oxygen Reduction Reaction in Electrochemical Systems

Keith

Jacob

2010

Modern Aspects of Electrochemistry

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Oxygen reduction reaction properties of carbon nanofibers: Effect of metal purification

Cited by 20 publications

References 58 publications

Carbon Nanofibers as Potential Catalyst Support for Fuel Cell Cathodes: A Review

Carbon Nanofibers as Potential Catalyst Support for Fuel Cell Cathodes: A Review

Density functional theory applied to electrocatalysis

Computational Simulations on the Oxygen Reduction Reaction in Electrochemical Systems

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