Effect of polyaniline-doped trifluoromethane sulfonic acid nanofiber composite film thickness on electrode for methanol oxidation

Gharibi, Hussein; Kakaei, Karim; Zhiani, Mohammad; Taghiabadi, Mohammad Mohammadi

doi:10.1016/j.ijhydene.2010.09.080

Cited by 28 publications

(6 citation statements)

References 36 publications

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“…Trifluoromethanesulfonic aciddoped polyaniline nanofibers, electrochemically incorporated onto carbon paper, led to a significant improvement in the degree of CH 3 OH oxidation. It also resulted in improvements in the accessible surface area, the electronic conductivity, the charge transfer at the polymer/electrolyte interface and the mass transfer resistance [113]. The Pt-Ru catalyst on this modified anode produced a maximum power density of 105 mW cm À2 , as compared with a value of 75 mW cm À2 obtained for the unmodified anode [114].…”

Section: Electrode Kinetic Limitationsmentioning

confidence: 92%

An overview of unsolved deficiencies of direct methanol fuel cell technology: factors and parameters affecting its widespread use

Kumar

Dutta

Das

et al. 2014

Int. J. Energy Res.

109

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SUMMARY Direct methanol fuel cells (DMFCs) have evolved over the years as a potential candidate for application as a power source in portable electronic devices and in transportation sectors. They have certain associated advantages, including high energy and power densities, ease of fuel storage and handling, ability to be fabricated with small size, minimum emission of pollutants, low cost, ready availability of fuel and solubility of fuel in aqueous electrolytes. However, in spite of several years of active research involved in the development of DMFC technology, their chemical‐to‐electrical energy conversion efficiencies are still lower compared with other alternative power sources traditionally used. This review paper will focus on the existing issues associated with DMFC technology and will also suggest on the possible developmental necessities required for this technology to realize its practical potentials. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Electrode Kinetic Limitationsmentioning

confidence: 92%

An overview of unsolved deficiencies of direct methanol fuel cell technology: factors and parameters affecting its widespread use

Kumar

Dutta

Das

et al. 2014

Int. J. Energy Res.

109

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“…The obtained results from LSV curves indicate that the current density can be significantly enhanced by increasing the electrolytic temperature, demonstrating the higher electrocatalytic activity and lower ohmic resistance of the cell. Figure 7(vi) shows the Arrhenius curve, the plot of the logarithm of the current density ln(i 0 ) versus the inverse temperature (1/T) [55], for the water splitting of the synthesis Ni -graphene/ carbon paper(c) as a best electrode in this work. The exchange current densities (i 0 ) were obtained by applying the extrapolation method to the Tafel plots ( figure 7(v)).…”

Section: Resultsmentioning

confidence: 99%

Nickel nanoparticles coated on the exfoliated graphene layer as an efficient and stable catalyst for oxygen reduction and hydrogen evolution in alkaline media

Kakaei

Ostadi

2020

Mater. Res. Express

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In this work, we report simultaneous electrochemical exfoliation of graphite powder using SDS, anionic surfactant salts, and cyclic potential to prepare graphene on carbon paper. Then, Nickel is electro-reduced into graphene nanosheets on carbon paper and also on the bare carbon paper to use in alkaline media for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). Afterward, graphene and Ni-graphene are characterized using scanning electron microscopy, atomic force microscopy (AFM) and electrochemical technique. SEM images show the Cauliflower structure of Ni in the absence of graphene and nanoparticle shapeless in the presence of smooth graphene. The electrochemical results show an excellent catalytic activity of Ni-graphene/ carbon paper with an over potential of 90 mV (Versus Ag/AgCl), which is lower than the literature value for Ni in alkaline electrolyte for HER (120 mV dec −1 ). The effect of graphene support on the electrochemical impedance spectroscopy response, activation energy and HER activity of the samples are investigated carefully. Finally, we prepare a novel gas diffusion electrode by using Ni pasted on carbon paper for the ORR in fuel cells and compared it with standard Pt/C catalysts using linear sweep voltammetry. ORCID iDsKarim Kakaei https://orcid.org/0000-0001-6820-696X

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“…85,91,95,109,[120][121][122] Therefore, a variety of doping acids have been studied to determine their specific roles in this respect, such as PSS, naphthalene sulfonic acid (NSA), para toluene sulfonic acid (PTSA), trifluoromethanol sulfonic acid (TFMSA), etc. [153][154][155][156][157] It is well-known that p-CPs exhibit conductive behavior only in their doped forms and a proper selection of dopant can lead to desired tuning of their conductivity. Traditional dopants, like chloride, sulfate, nitrate, etc., have been replaced by polymeric acid dopants in order to fulfill a second vital function, i.e., providing steric and electrostatic stabilizing to the catalyst particles by preventing their aggregate formation and facilitating the formation of homogeneously dispersed smaller Pt particles.…”

Section: P-conjugated Polymers In Dmfcs 29mentioning

confidence: 99%

“…157 Other polymeric acid dopants, such as poly(acrylic acid), poly(acrylic acid-co-maleic acid), camphor sulfonic acid (CSA), and TFMSA have also exhibited good performance and stability in the DMFC anodes. 88,154,164,165 In addition, doping often leads to change of surface wettability of the p-CPs. It was observed that while sulphuric acid and hydrochloric acid doped PAni NFs produced a power density of 48 mWcm ¡2 and 46 mWcm ¡2 , respectively, CSAdoped PAni NFs generated 51 mWcm ¡2 of power density.…”

Section: P-conjugated Polymers In Dmfcs 31mentioning

confidence: 99%

Synthesis, Preparation, and Performance of Blends and Composites of π-Conjugated Polymers and their Copolymers in DMFCs

2015

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p-conjugated aromatic polymers (p-CPs) are a class of high performance materials used in fabrication of a number of devices. Their use in direct methanol fuel cells (DMFCs) has resulted in improving the performance of this prospective alternative energy harnessing device. This review focuses on these aspects of p-CPs, from fabrication techniques to structure-property relationships and finally performance evaluation and comparison with other potential candidates. Along with an overview of the step-by-step progress that has been made in the last two decades, this review consists of a separate section dedicated to the advancements made in the last five years. This period has seen considerable progress in terms of preparation techniques, such as fabrication of layer-by-layer assembly and core-shell assembly; materials used, such as variety of dopants for p-CPs and sulfonated polymers in case of PEMs and p-CP composites with carbon nanotubes and graphenes in case of catalyst supporting matrices; and surface morphology, such as use of nanofibers, nanotubes, and nanowires. In addition, different polymerization strategies and solubility aspects of p-CPs have also been discussed. All these modifications have resulted in yielding high power and current densities, mass specific activity, stability, durability, and judicious utilization of costly materials, like Pt and Nafion.

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Effect of polyaniline-doped trifluoromethane sulfonic acid nanofiber composite film thickness on electrode for methanol oxidation

Cited by 28 publications

References 36 publications

An overview of unsolved deficiencies of direct methanol fuel cell technology: factors and parameters affecting its widespread use

An overview of unsolved deficiencies of direct methanol fuel cell technology: factors and parameters affecting its widespread use

Nickel nanoparticles coated on the exfoliated graphene layer as an efficient and stable catalyst for oxygen reduction and hydrogen evolution in alkaline media

Synthesis, Preparation, and Performance of Blends and Composites of π-Conjugated Polymers and their Copolymers in DMFCs

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