Pd–TiO2/C as a methanol tolerant catalyst for oxygen reduction reaction in alkaline medium

Maheswari, S.; Sridhar, P.; Pitchumani, S.

doi:10.1016/j.elecom.2012.10.021

Cited by 43 publications

(34 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition to these features, the carbon-support of the catalyst can also contribute to the EI spectral features (see the section "Effect of carbon-support in the catalyst layer on the EI spectra"). The ionomer-containing carbon spectrum manifests an EDR (45 • line in the high frequency (HF) region) and a capacitive behavior (a line almost parallel to the y axis). Therefore, an (R 3 , Q 3 ) element is used to represent the carbon feature in the supported catalysts.…”

Section: Resultsmentioning

confidence: 99%

“…These include, in addition to Pt-based materials, chalcogenides, Pd alloys, and non-precious metal catalysts. [4][5][6][42][43][44][45][46][47] TF-RDE/rotating ring disk electrodes (RRDE) are popular in the characterization of these new catalyst formulations. Usually, this is done in aqueous electrolytes (0.1 M KOH, 0.1 M HClO 4 or 0.5 M H 2 SO 4 ) or non-aqueous electrolytes (lithium bis(trifluoromethylsulfonyl) imide (LiTFSI) in diglyme) using DC methods.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Electrochemical Impedance Spectroscopy of Oxygen Reduction Reaction (ORR) in a Rotating Disk Electrode Configuration: Effect of Ionomer Content and Carbon-Support

Singh

Devivaraprasad

Kar

et al. 2015

J. Electrochem. Soc.

161

112

View full text Add to dashboard Cite

Oxygen reduction reaction (ORR) in acidic media is investigated at various potentials in a thin-film rotating disk electrode (TF-RDE) configuration using electrochemical impedance spectroscopy (EIS). The ionomer-free and ionomer-containing thin-film catalyst layers are composed of Pt black and carbon-supported Pt catalysts of different metal loadings (5 and 20 wt%). The simplest EI spectrum consisting of an arc or a semi-circle is obtained at high potentials with ionomer-free Pt catalyst layers. The most complex spectrum consisting of a high frequency (HF) arc and two semi-circles is observed in the mixed diffusion-controlled region of the ionomer-containing catalyst layer with high loading of carbon-supported Pt. The nature of the EI spectrum is decided by the constituents of the thin-film catalyst layer and by the operating potential. The evolution of the EI spectra with ionomer and carbon contents is underlined. The effect of rotation rate (rpm) of the electrode on the impedance spectrum is also investigated. A series of equivalent circuits is required to completely describe the EI spectra of ORR. The kinetic parameters and the electrochemical surface area of the catalysts are derived from the impedance spectrum. Oxygen reduction reaction (ORR) is one of the most important reactions at the cathode side in low-temperature fuel cells (e.g., polymer electrolyte fuel cells (PEFCs) and direct methanol fuel cells (DMFCs)) and metal-air batteries.1-14 Because of the sluggish ORR kinetics and the stability issues of the catalyst in the electrochemical environment, expensive precious metal catalysts are often used in these electrochemical devices to catalyze the ORR. 15 Conventionally, the performance of the catalyst is evaluated in an operating fuel cell mode using the DC methods. [16][17][18] The information gathered from a DC analysis usually provides the sum of various polarizations of the electrode, which is difficult to separate into individual contributions. 19 On the other hand, electrochemical impedance spectroscopy (EIS), one of the AC methods, is a sensitive tool to investigate electrode-electrolyte interface and it allows the simultaneous resolution of various charge-transfer and mass-transfer processes (kinetic, ohmic, and diffusion). It involves a small sinusoidal electrical perturbation around a steady-state value and measures the impedance along with the phase angle. However, the interpretation of the EI spectra is difficult. Often, simple fitting models based on equivalent circuit analogues and physical models are used to extract the parameters those represent the underlying cell processes. [20][21][22][23][24][25][26] Springer et al. proposed the theoretical impedance spectrum of ORR on porous gas-diffusion electrode using the flooded-agglomerate electrode model in series with a thin electrolyte film. 20,25 The model predicted by Raistrick shows three semi-circles in the spectrum attributed to the charge-transfer process (ORR); agglomerate diffusion (depletion of the oxygen concentration in the pores...

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Electrochemical Impedance Spectroscopy of Oxygen Reduction Reaction (ORR) in a Rotating Disk Electrode Configuration: Effect of Ionomer Content and Carbon-Support

Singh

Devivaraprasad

Kar

et al. 2015

J. Electrochem. Soc.

161

112

View full text Add to dashboard Cite

show abstract

“…12), Pt and Pd present large anodic currents, which increases notably with the increment of methanol or ethanol concentrations (not shown), superimposed to the oxygen reduction one. These anodic signals are related to methanol oxidation reaction (MOR) [32,33] and ethanol oxidation reaction (EOR), processes that take place when the crossover occurs in a fuel cell producing a mixed potential at the cathode. It is known that such mixed potentials could negatively affect the cathode performance of the ADAFCs and, according to Fig.…”

Section: Oxygen Electroreduction In Presence Of Alcoholsmentioning

confidence: 99%

Carbon supported Ag and Ag–Co catalysts tolerant to methanol and ethanol for the oxygen reduction reaction in alkaline media

Hernández-Rodríguez

Goya

Arévalo

et al. 2016

International Journal of Hydrogen Energy

View full text Add to dashboard Cite

“…Based on the theory that TiO2 nanoparticles in the catalyst can adsorb OHads species and promote the oxidation reaction on the electrode, Xu et al [44] prepared highly dispersed carbon supported Pd-TiO2 catalyst with intermittent microwave irradiation. The activity of Pd-TiO2/C catalyst for the oxidation of formic acid was higher than that of the Pd/C catalyst [106]. Wang et al [54] investigated Pd nanoparticles supported on carbon-modified rutile TiO2 (CMRT) as catalyst for formic acid oxidation.…”

Section: Pd Supported On Oxidesmentioning

confidence: 99%

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

2015

View full text Add to dashboard Cite

This review selectively summarizes the latest developments in the Pd-based cataysts for low temperature proton exchange membrane fuel cells, especially in the application of formic acid oxidation, alcohol oxidation and oxygen reduction reaction. The advantages and shortcomings of the Pd-based catalysts for electrocatalysis are analyzed. The influence of the structure and morphology of the Pd materials on the performance of the Pd-based catalysts were described. Finally, the perspectives of future trends on Pd-based catalysts for different applications were considered.

show abstract

Pd–TiO2/C as a methanol tolerant catalyst for oxygen reduction reaction in alkaline medium

Cited by 43 publications

References 21 publications

Electrochemical Impedance Spectroscopy of Oxygen Reduction Reaction (ORR) in a Rotating Disk Electrode Configuration: Effect of Ionomer Content and Carbon-Support

Electrochemical Impedance Spectroscopy of Oxygen Reduction Reaction (ORR) in a Rotating Disk Electrode Configuration: Effect of Ionomer Content and Carbon-Support

Carbon supported Ag and Ag–Co catalysts tolerant to methanol and ethanol for the oxygen reduction reaction in alkaline media

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

Contact Info

Product

Resources

About