Platinum nanoparticles spontaneously formed on HOPG

Shen, Peikang; Chi, Ning; Chan, Kwong‐Yu; Phillips, David Lee

doi:10.1016/s0169-4332(00)00848-5

Cited by 37 publications

(42 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the spontaneous or electroless deposition of Pt on HOPG from PtCl 2 6 solutions have been repeatedly observed [83][84][85]. Penner et al [83] proposed that the thermodynamic driving force for the reaction was the reactivity of the functional groups present at defects and step edges, their oxidation providing the required electrons for reductive electrodeposition to other sections of the graphene sheets.…”

Section: Mechanism Of Spontaneous Modification Of Gc With Aryldiazonimentioning

confidence: 99%

Spontaneous modification of glassy carbon surface with anthraquinone from the solutions of its diazonium derivative: An oxygen reduction study

Seinberg

Kullapere

Mäeorg

et al. 2008

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

Section: Mechanism Of Spontaneous Modification Of Gc With Aryldiazonimentioning

confidence: 99%

Spontaneous modification of glassy carbon surface with anthraquinone from the solutions of its diazonium derivative: An oxygen reduction study

Seinberg

Kullapere

Mäeorg

et al. 2008

Journal of Electroanalytical Chemistry

View full text Add to dashboard Cite

“…The individual Pt nanoparticles have an average diameter of 10-20 nm with height of about 1.5-2.5 nm, similar in geometry to Pt nanoparticles reduced on the edge sites of HOPG from PtCl 6 2− . 13,24 It is assumed that the dissolved Pt ions are spontaneously reduced by the incompletely oxidized functionalities at the edge sites, analogous to the case for PtCl 6 2− . 13 The characteristic plate-like morphology may come from the high mobility of as-reduced Pt on the HOPG surface leading to a two-dimensional growth.…”

Section: Resultsmentioning

confidence: 99%

Model Electrode Studies of the Electrostatic Interaction between Electrochemically Dissolved Pt Ions and RuO₂Nanosheets

Sannegowda

Chauvin

et al. 2013

J. Electrochem. Soc.

View full text Add to dashboard Cite

Model electrodes consisting of ruthenium oxide nanosheets coated on freshly cleaved highly oriented pyrolytic graphite (RuO 2 nanosheet/HOPG) were prepared to investigate the electrostatic interactions between RuO 2 nanosheets and electrochemically dissolved Pt ions. The RuO 2 nanosheet/HOPG model electrode was dipped into a solution containing dissolved Pt ions generated by potential cycling a Pt working electrode in sulfuric acid electrolyte. Scanning tunneling microscopy revealed preferential adsorption of Pt ions on the nanosheets as island-like deposits, while no such deposits were observed on HOPG. This shows the strong electrostatic interactions between the positively-charged Pt ions and negatively-charged nanosheet. The calculated amount of Pt ions adsorbed was 0.93 × 10 6 atoms μm −2 , which agreed with the theoretical saturated adsorption amount of Pt ion on RuO 2 nanosheet of 0.96 × 10 6 atoms μm −2 . All of the Pt ions could be electrochemically reduced to Pt nanoparticles showing activity toward the oxygen reduction reaction. Platinum supported on carbon (Pt/C) is widely used as a cathode catalyst in polymer electrolyte fuel cells because of its high oxygen reduction reaction (ORR) activity. The loss of electrocatalytic activity during fuel cell operation is a detrimental factor to the useful lifetime of commercial polymer electrolyte fuel cell systems. Hence, there is a strong demand to improve the durability of electrocatalyst to realize the wide-spread commercialization of polymer electrolyte fuel cells. Numerous studies have clarified that dissolution, migration and/or sintering of platinum nanoparticles on carbon are vital degradation factors of the cathode catalyst. [1][2][3] Oxides that are stable under acidic and oxidizing conditions have been suggested to enhance the durability of Pt as cathode catalysts. For example, SnO 2 has been proposed as an alternative support to replace carbon to enhance the durability of Pt catalyst due to its resistance to corrosion. 4 TiO 2 added to Pt/C was suggested to anchor platinum particles, preventing agglomeration and coalescence during durability testing. 5,6 Carbon supported Pt covered with a thin layer of SiO 2 has been shown to exhibit high stability during potential cycling in H 2 SO 4 electrolyte. 7,8 The foundation of the increase in durability due to the addition of these oxides is not well understood. In addition, due to the poor conductivity of these oxides, the original properties of Pt/C are often inevitably obstructed, which includes the loss of initial electrochemical surface area (ECSA) and ORR activity with the addition of oxides.Contrary to most other oxide systems, RuO 2 nanostructures possess excellent electronic conductivity and electrochemical stability, making them an ideal additive that would not obstruct electrode kinetics. Indeed, we and others have found that the combination of RuO 2 nanostructures and Pt nanoparticles can enhance ORR properties. For example, incorporation of carbon-supported RuO 2 (RuO 2 /C) to Pt was found to a...

show abstract

“…The resulting solution (%250 ml) contained about 1 wt.% of Ag, and 50 ml of this solution were added to 5 g of B carbon. This carbon is expected to have some aldehyde-type of groups, necessary for the formation of silver nanoparticles according to the Tollens method, and/or some incompletely oxidized functionalities or other defects on the surface [38,39], which by reacting with [Ag(NH 3 ) 2 ] + will get oxidized, reducing Ag + to Ag.…”

Section: Methodsmentioning

confidence: 99%

Effect of silver nanoparticles deposited on micro/mesoporous activated carbons on retention of NOx at room temperature

Bashkova

Deoki

Bandosz

2011

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Platinum nanoparticles spontaneously formed on HOPG

Cited by 37 publications

References 15 publications

Spontaneous modification of glassy carbon surface with anthraquinone from the solutions of its diazonium derivative: An oxygen reduction study

Spontaneous modification of glassy carbon surface with anthraquinone from the solutions of its diazonium derivative: An oxygen reduction study

Model Electrode Studies of the Electrostatic Interaction between Electrochemically Dissolved Pt Ions and RuO₂Nanosheets

Effect of silver nanoparticles deposited on micro/mesoporous activated carbons on retention of NOx at room temperature

Contact Info

Product

Resources

About

Platinum nanoparticles spontaneously formed on HOPG

Cited by 37 publications

References 15 publications

Spontaneous modification of glassy carbon surface with anthraquinone from the solutions of its diazonium derivative: An oxygen reduction study

Spontaneous modification of glassy carbon surface with anthraquinone from the solutions of its diazonium derivative: An oxygen reduction study

Model Electrode Studies of the Electrostatic Interaction between Electrochemically Dissolved Pt Ions and RuO2Nanosheets

Effect of silver nanoparticles deposited on micro/mesoporous activated carbons on retention of NOx at room temperature

Contact Info

Product

Resources

About

Model Electrode Studies of the Electrostatic Interaction between Electrochemically Dissolved Pt Ions and RuO₂Nanosheets