Facile synthesis of polyaniline/titanium carbide (MXene) nanosheets/palladium nanocomposite for efficient electrocatalytic oxidation of methanol for fuel cell application

Elancheziyan, Mari; Eswaran, Muthusankar; Shuck, Christopher E.; Senthilkumar, Sellappan; Satheeshkumar, Elumalai; Dhanusuraman, Ragupathy; Ponnusamy, Vinoth Kumar

doi:10.1016/j.fuel.2021.121329

Cited by 42 publications

(13 citation statements)

References 72 publications

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“…The vibrational absorption peaks occurring at 3135, 2291, 1590, 1404, and 1120 cm –1 are observed in nPds . Furthermore, for nPdNFs, the peaks shifted to 1629 and 1120 cm –1 due to the introduction of nPds onto the NFs for the formation of nPdNF nanocomposites, and the additional peaks at 498 and 619 cm –1 are attributed to the vibration stretching of Ti–C and Ti–O, respectively. , …”

Section: Results and Discussionmentioning

confidence: 90%

Nanopalladium-Anchored MXene Nanoflowers for Boosting Electrocatalytic Hydrogen Evolution Reaction

Raj,

Patel,

Sharma

et al. 2023

Energy Fuels

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The synthesis of efficient hydrogen evolution reaction (HER) electrocatalysts is challenging for industrial-scale hydrogen generation by water splitting. Since their discovery in 2011, MXenes have been extensively investigated for their use in various energy applications as they possess sheet-like morphology that provides more active surface area and facilitates fast ion transfer. This work utilizes a facile hydrothermal treatment to fabricate palladium-modified MXene nanoflowers (nPdNFs). Chemical and morphological analysis of these synthesized nPdNFs shows that nPds have been successfully incorporated in MXene nanoflowers and act as an excellent support material for nPds. The effect of temperature and the thermal decomposition properties of the synthesized material were investigated by calcining it at different temperatures like 200, 300, and 400 °C in a flow of N2 gas. It is observed that nPdNFs-3 (calcined at 300 °C) exhibits maximum active catalytic sites for HER because its porous morphology supports rapid ion transportation. The electrochemical active surface area (ECSA) for all three materials was evaluated, among which nPdNFs-3 demonstrated the highest ECSA value, corroborating its HER activity and depicting a current density of 10 mA cm−2 at a low overpotential of 149 mV, with a Tafel slope of 96 mV dec–1 in 0.5 M H2SO4. The fabricated nanostructured material highlights ceaseless efforts and paves the way for developing MXenes and related materials, which can be employed in the energy conversion and storage sector.

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Section: Results and Discussionmentioning

confidence: 90%

Nanopalladium-Anchored MXene Nanoflowers for Boosting Electrocatalytic Hydrogen Evolution Reaction

Raj,

Patel,

Sharma

et al. 2023

Energy Fuels

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“…312,313 Similarly, the polyaniline/Pd/Ti 3 C 2 T x nanocomposite has been developed and has exhibited three times higher peak current density (291 mA cm −2 ) than Pd/MXene (106 mA cm −2 ), attributed to the enhanced interaction and modulation for the Pd active sites. 314…”

Section: Electrochemical Conversion Reactionsmentioning

confidence: 99%

Engineering strategies and active site identification of MXene-based catalysts for electrochemical conversion reactions

et al. 2023

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“…There is also a possibility of a parallel mode where oxygen can directly oxidize the reduced form of polyaniline to produce polarons as suggested by Khomenko et al [4].…”

Section: Mechanism Of Oxidation Of Polyanilinementioning

confidence: 99%

“…Conducting polyaniline films are used as electrodes in supercapacitors, renewable batteries and fuel cells [2][3][4][5][6]. These applications usually make use of thin polyaniline films [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Autogenous Oxidation/Reduction of Polyaniline in Aqueous Sulfuric Acid

et al. 2022

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In this work, we have shown through open circuit potential experiments that in aqueous sulfuric acid solutions, a thick polyaniline film undergoes autogenous oxidation when reduced below a threshold potential and autogenous reduction when oxidized above the threshold potential. This phenomenon is associated with the high resonance stability of polarons in long polyaniline chains present in thicker films. We have determined the rates of these reactions using a linear sweep chronopotentiometry technique. We propose that the oxidation reaction of polyaniline produces polarons with a concomitant reduction of hydrogen ions to hydrogen radicals, which further combine with each other to produce the hydrogen molecule in the absence of dissolved oxygen. On the other hand, at high potentials polarons are reduced with the concomitant oxidation of water to hydroxyl radicals. Both the radicals are stabilized due to the interaction of their unpaired electrons with pi-electrons of the aromatic rings of the polymer backbone. At the equilibrium value of the open circuit potential, both the hydrogen radicals and hydroxyl radicals are generated at equal rates and react with each other to form water.

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Facile synthesis of polyaniline/titanium carbide (MXene) nanosheets/palladium nanocomposite for efficient electrocatalytic oxidation of methanol for fuel cell application

Cited by 42 publications

References 72 publications

Nanopalladium-Anchored MXene Nanoflowers for Boosting Electrocatalytic Hydrogen Evolution Reaction

Nanopalladium-Anchored MXene Nanoflowers for Boosting Electrocatalytic Hydrogen Evolution Reaction

Engineering strategies and active site identification of MXene-based catalysts for electrochemical conversion reactions

Autogenous Oxidation/Reduction of Polyaniline in Aqueous Sulfuric Acid

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