Generalized scheme of chemisorption, electrooxidation and electroreduction of simple organic compounds on platinum group metals

Bagotzky, V.S.; Vassiliev, Yu.B.; Хазова, О. А.

doi:10.1016/s0022-0728(77)80019-3

Cited by 378 publications

(200 citation statements)

References 29 publications

Supporting

Mentioning

188

Contrasting

Unclassified

Order By: Relevance

“…[3][4][5][6][7][8][9][10] An important intermediate is HCO which has been shown to occupy three adjacent sites. It can be further dehydrogenated to CO, which subsequently reacts with adsorbed oxygen species ͑OH or O͒ to form CO 2 .…”

Section: Mechanism and Modelmentioning

confidence: 99%

“…A promising candidate as energy source is methanol for so-called direct methanol fuel cells 2 on which numerous mechanistic and kinetic studies have been carried out. [3][4][5][6][7][8][9][10] The oxidation of MeOH on noble metal electrodes ͑Pt or Pt/Ru͒ is known to exhibit kinetic instabilities, e.g., under galvanostatic conditions the process exhibits kinetic oscillations as well as a hard transition to high potential. 4 Such dynamic instabilities can be exploited for model development as will be shown in the present study where we identify the core mechanism explaining the experimentally observed bifurcation sequence.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanism and model of the oscillatory electro-oxidation of methanol

Sauerbrei

Nascimento

Eiswirth

et al. 2010

The Journal of Chemical Physics

View full text Add to dashboard Cite

Particle-particle particle-mesh method for dipolar interactions: On error estimates and efficiency of schemes with analytical differentiation and mesh interlacing J. Chem. Phys. 135, 184110 (2011) Revisiting falloff curves of thermal unimolecular reactions J. Chem. Phys. 135, 054304 (2011) Collision limited reaction rates for arbitrarily shaped particles across the entire diffusive Knudsen number range J. Chem. Phys. 135, 054302 (2011) Simulating structural transitions by direct transition current sampling: The example of LJ38 J. Chem. Phys. 135, 034108 (2011) Optimizing transition interface sampling simulations J. Chem. Phys. 134, 244118 (2011) Additional information on J. Chem. Phys. A mechanism for the kinetic instabilities observed in the galvanostatic electro-oxidation of methanol is suggested and a model developed. The model is investigated using stoichiometric network analysis as well as concepts from algebraic geometry ͑polynomial rings and ideal theory͒ revealing the occurrence of a Hopf and a saddle-node bifurcation. These analytical solutions are confirmed by numerical integration of the system of differential equations.

show abstract

Section: Mechanism and Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanism and model of the oscillatory electro-oxidation of methanol

Sauerbrei

Nascimento

Eiswirth

et al. 2010

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…Carbon-based materials are widely used as support materials because of their textural, electronic, adsorption, and molecular sieving properties. Carbon blacks (CBs) have been widely used as electrocatalyst supports because of their high electric conductivity and surface area and their low cost [8,9]. Recently, a graphitic nanostructured carbon material, multi-walled nanotubes (MWCNTs), has been the object of focus as a catalyst support for DMFCs owing to its high strength, low density, and high electrical and thermal conductivity [10,11].…”

Section: Resultsmentioning

confidence: 99%

Methanol oxidation behaviors of PtRu nanoparticles deposited onto binary carbon supports for direct methanol fuel cells

Park

Park²,

Lee³

2013

Carbon letters

View full text Add to dashboard Cite

In this study, PtRu nanoparticles deposited on binary carbon supports were developed for use in direct methanol fuel cells using carbon blacks (CBs) and multi-walled carbon nanotubes (MWCNTs). The particle sizes and morphological structures of the catalysts were analyzed using X-ray diffraction and transmission electron microscopy, and the PtRu loading content was determined using an inductively coupled plasma-mass spectrometer. The electrocatalytic characteristics for methanol oxidation were evaluated by means of cyclic voltammetry with 1 M CH 3 OH in a 0.5 M H 2 SO 4 solution as the electrolyte. The PtRu particle sizes and the loading level were found to be dependent on the mixing ratio of the two carbon materials. The electroactivity of the catalysts increased with an increasing MWCNT content, reaching a maximum at 30% MWCNTs, and subsequently decreased. This was attributed to the introduction of MWCNTs as a secondary support, which provided a highly accessible surface area and caused morphological changes in the carbon supports. Consequently, the PtRu nanoparticles deposited on the binary support exhibited better performance than those deposited on the single support, and the best performance was obtained when the mass ratio of CBs to MWCNTs was 70:30.

show abstract

“…can be formed from the intermediates CH 2 OH and CHOH, respectively [30]. The oxidation products of methanol at potentials between 0.5 and 0.6 V (RHE) are found to be CO 2 , HCHO, HCOOH and HCOOCH 3 (methylformate).…”

Section: Mor In Acidic Conditionmentioning

confidence: 93%

Nitrogen-doped graphene with enhanced oxygen reduction activity produced by pyrolysis of graphene functionalized with imidazole derivatives

Borghei

Azcune

Carrasco

et al. 2014

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

Direct methanol fuel cells (DMFC) are great candidates for portable power source applications. However, the sluggish reaction kinetics are key challenges in DMFC technology. The state-of-the-art electrocatalysts are Pt-based catalysts supported on carbon black. However, the high price of Pt, corrosion of carbon support and Pt degradation are the main problems.In this thesis, carbon nanomaterials, namely few-walled carbon nanotubes (FWCNTs) and graphitized nanofibers (GNFs) were used as catalyst supports in the search for stable and durable catalysts. PtRu nanocatalysts with similar particle size and composition were synthesized and deposited on FWCNTs and GNFs. The electrochemical activities for methanol oxidation were compared with that of PtRu-carbon black in acidic conditions. The half-cell electrochemical measurements revealed higher activity with PtRu-GNFs and PtRu-FWCNTs. Later, the electrocatalysts were tested in macro-and micro-DMFC. The results revealed the significant influence of the catalyst support, inomer contect, electrode structure, preparation method, as well as the fuel cell architecture on the performance of a specific electrode material. The results also highlighted the necessity of electrode composition optimization when applying new materials at the electrodes, in order to achieve the best activity and durability for a certain electrocatalyst.A special effort was also done to achieve Pt-free electrocatalysts with high activity for the oxygen reduction reaction (ORR) by introducing nitrogen heteroatoms in carbon nanomaterials, namely FWCNTs and graphite nanoplatelets (GNPs). N-FWCNTs exhibited remarkable electrocatalytic activity for ORR in alkaline media, despite their very low nitrogen content (~0.5 at.%). N-FWCNTs performed on par or better than a commercial Pt-C at the cathode of an alkaline DMFC. The N-GNPs exhibited enhanced electrocatalytic activity for ORR compared to pristine GNPs in alkaline media. The results indicated that N-doped carbon nanomaterials could be promising alternatives to their Pt counterparts to reduce fuel cell costs. However, further investigations are necessary to ascertain the real active sites in order to design more efficient and durable ORR electrocatalysts.Keywords Carbon nanomaterials, PtRu catalysts, nitrogen-doping, direct methanol fuel cell ISBN (printed) 978-952-60-6140-5 ISBN (pdf) 978-952-60-6141-2

show abstract

Generalized scheme of chemisorption, electrooxidation and electroreduction of simple organic compounds on platinum group metals

Cited by 378 publications

References 29 publications

Mechanism and model of the oscillatory electro-oxidation of methanol

Mechanism and model of the oscillatory electro-oxidation of methanol

Methanol oxidation behaviors of PtRu nanoparticles deposited onto binary carbon supports for direct methanol fuel cells

Nitrogen-doped graphene with enhanced oxygen reduction activity produced by pyrolysis of graphene functionalized with imidazole derivatives

Contact Info

Product

Resources

About