Pt-Pd nanoelectrocatalyst of ultralow Pt content for the oxidation of formic acid: Towards tuning the reaction pathway

Ghosh, Sourov; Raj, C. Retna

doi:10.1007/s12039-015-0854-6

Cited by 13 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The improved CO * tolerance can also be a result of ensemble effects, which discourage the dehydration pathway due to the lack of favorable geometrical arrangements of Pt atoms toward CO * formation. This has been reported for PtPd 122,126 and PtAu [127][128][129][130][131] alloys. More successful examples of Pd-based alloys have also been recently reviewed, 132,133 while Demirci reviews the theoretical tools for screening bimetallic anode catalysts for electrochemical oxidation of liquid fuels, including FA.…”

Section: Structure Sensitivity Of Fao On Ir-as Shown In Figuresupporting

confidence: 71%

Structure Sensitivity of Formic Acid Electrooxidation on Transition Metal Surfaces: A First-Principles Study

Elnabawy

Herron

Scaranto

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

Formic acid presents several advantages for use as a fuel in fuel cells. We present a first-principles based analysis of electrooxidation trends for formic acid on the close-packed facets of eight fcc metals: Au, Ag, Cu, Pt, Pd, Ni, Ir, and Rh, and four hcp metals: Co, Os, Ru, and Re. To explore the structure sensitivity of this reaction on the fcc metals, we also studied the open (100) facet of these eight metals. We find that the open facets of Au, Ag, Cu, Pt, and Pd are more energy-efficient (i.e. require less overpotential) for formic acid electrooxidation when compared to their close-packed facets. The opposite is true for the stronger-binding metals: Ni, Ir, and Rh. Using the free energy of adsorbed CO * and OH * as reactivity descriptors, we cast the thermochemistry of the reaction network into phase diagrams showing regions of rate-determining steps, together with their calculated free energies. This allows the identification of bimetallic alloys, potentially possessing improved electrocatalysis for formic acid electrooxidation, compared to Pt or Pd. We discuss the need for anode catalysts for direct formic acid fuel cells (DFAFCs) to diminish CO * poisoning, by promoting the formation of formate instead of carboxyl intermediate.

show abstract

Section: Structure Sensitivity Of Fao On Ir-as Shown In Figuresupporting

confidence: 71%

Structure Sensitivity of Formic Acid Electrooxidation on Transition Metal Surfaces: A First-Principles Study

Elnabawy

Herron

Scaranto

et al. 2018

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…R ct , R s , and C 1 revealed the charge transfer resistance relating to formic acid oxidation, solution resistance, and double‐layer capacitance, respectively. Mainly, R ct, which is equivalent to the polarization resistance of the electrochemical system, is defined by the diameter of the extrapolated semicircle in the Nyquist diagram, and the smaller the semicircle diameter is, the smaller R ct , and consequently, the higher kinetics of the oxidation 51,52 . However, the lowest R ct (657.4 Ω) was obtained for the 6Pt/PVA/GO electrode compared with the other catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…the smaller the semicircle diameter is, the smaller R ct , and consequently, the higher kinetics of the oxidation. 51,52 However, the lowest R ct (657.4 Ω) was obtained for the 6Pt/PVA/GO electrode compared with the other catalysts.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 92%

Polyvinyl alcohol‐modified graphene oxide as a support for bimetallic Pt–Pd electrocatalysts to enhance the efficiency of formic acid oxidation

Saipanya

Themsirimongkon

et al. 2022

Polymers for Advanced Techs

View full text Add to dashboard Cite

The aim of this research was to study the efficiency of polyvinyl alcohol (PVA)modified graphene oxide (GO) as a supporting material for catalysts that oxidize formic acid. The active metal catalysts (e.g., Pt and Pd) were electrodeposited on PVA/GO surfaces. The morphologies of the prepared catalysts were characterized by scanning electron microscopy and transmission electron microscopy, while their chemical compositions were identified by X-ray diffraction and X-ray photoelectron spectroscopy. The results show that compared with the other catalysts on GO, the prepared active PtPd alloy catalyst nanoparticles with 11.49-20.73 nm sizes were well dispersed on the PVA/GO surfaces. Electrochemical results indicate that the activities of the catalysts with PVA provided a higher current density than that of the catalysts without PVA. The bimetallic 3Pt3Pd/PVA/GO catalyst showed the greatest catalytic activity, stability, and CO oxidation when compared to those of other catalysts. The electronic, morphological, and structural properties promote the masscharge transfer through the interaction. These results indicate that the PVA-modified GO provides a suitable site for active bimetallic catalyst surfaces, resulting in excellent formic acid oxidation and high CO elimination. The 3Pt3Pd/PVA/GO electrocatalyst is promising for enhancing formic acid oxidation.

show abstract

“…In a study, six different equivalent circuits were defined for methanol oxidation 55 . A similar situation can be considered for formic acid oxidation 56 . The circuit comprises different situations: (a) charge transfer rate ( R ct ) and the double layer capacitance ( Q dl ), and another contribution (b) rate of intermediate adsorption ( R ads ) and to the adsorption capacitance ( Q ads ) 57 .…”

Section: Resultsmentioning

confidence: 99%

Carbon black‐heteroatom‐doped graphene aerogel hybrid supported platinum nanoparticles as electrocatalysts for oxidation of methanol and formic acid

Çögenli

Yurtcan

2022

Intl J of Energy Research

View full text Add to dashboard Cite

Summary Supported catalysts are generally used for electrochemical reactions in fuel cells. Due to their superior properties in these reactions, platinum nanoparticles are preferred over carbon‐structured support materials. Commercial carbon support material such as carbon black (Vulcan XC‐72) is widely used alone for the deposition of platinum particles on the surface. But this support material when used alone is easily affected from the operating conditions of methanol and formic acid oxidation resulting from chemical reaction. Graphene aerogels (GA) are the graphene‐based materials that are important discoveries in nanotechnology, recently. These materials are being investigated as support materials in fuel cell catalysts. In this study, carbon black was used together with GA and heteroatom‐doped GA, as support materials. Three different hybrid carbon (50:50) supported Pt nanoparticles, namely, Pt/GA‐C (carbon black and GA), Pt/NGA‐C (carbon black‐ and nitrogen‐doped GA), and Pt/BGA‐C (carbon black‐ and boron‐doped GA) were synthesized by using, first, the modified Hummers method, second, hydrothermal treatment for support materials, and microwave irradiation method for Pt nanoparticles formation on support materials. The hybrid supported catalysts were characterized using scanning electron microscope, energy dispersion spectroscopy, BET, X‐ray diffractometer, transmission electron microscope, Raman, X‐ray photoelectron spectroscopy, inductively coupled plasma mass spectrometry. The catalysts analysis was studied using cyclic voltammetry, impedance, and short‐term durability. The Pt/BGA‐C catalyst showed the highest catalytic activity for both formic acid and methanol oxidation.

show abstract

Pt-Pd nanoelectrocatalyst of ultralow Pt content for the oxidation of formic acid: Towards tuning the reaction pathway

Cited by 13 publications

References 32 publications

Structure Sensitivity of Formic Acid Electrooxidation on Transition Metal Surfaces: A First-Principles Study

Structure Sensitivity of Formic Acid Electrooxidation on Transition Metal Surfaces: A First-Principles Study

Polyvinyl alcohol‐modified graphene oxide as a support for bimetallic Pt–Pd electrocatalysts to enhance the efficiency of formic acid oxidation

Carbon black‐heteroatom‐doped graphene aerogel hybrid supported platinum nanoparticles as electrocatalysts for oxidation of methanol and formic acid

Contact Info

Product

Resources

About