Lanthanum nickel oxide nano-perovskite decorated carbon nanotubes/poly(aniline) composite for effective electrochemical oxidation of urea

Galal, Ahmed; Atta, Nada F.; Hefnawy, Mahmoud A.

doi:10.1016/j.jelechem.2020.114009

Cited by 37 publications

(17 citation statements)

References 43 publications

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“…The calculated diffusion coefficient was represented in Table 4, and the highest value was recorded at G/Pani/NiMn2 electrocatalyst equal 2.47

\times

10 −6 mol cm −2 . Accordingly, the resultant diffusion coefficient is comparable with other catalysts mentioned in urea electrooxidation based on nickel catalysts like 2.62

\times

10 −7 , 1.11

\times

10 −5 , and 2.21

\times

10 −6 cm 2 s −1 for Pani/LNO‐CNT, [56] Ni−Co, [57] and Ni−Mo, [58] respectively.…”

Section: Resultssupporting

confidence: 76%

NiO‐MnOx/Polyaniline/Graphite Electrodes for Urea Electrocatalysis: Synergetic Effect between Polymorphs of MnOx and NiO.

et al. 2022

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In this work, we are enhancing the catalytic activity of the urea electrooxidation (UEO) process by using the composite of polyaniline (Pani), nickel oxide (NiO), and polymorphs of manganese oxide (MnOx) based on a graphite electrode. The hydro‐gel method was used to prepare catalyst suspension with different ratios from NiO and MnOx. The chemical structures and surface morphology were characterized by employing the IR, XRD, and SEM/EDEX techniques. The catalytic activity of four modified electrocatalysts G/Pani/NiMn1, G/Pani/NiMn2, G/Pani/NiMn3, G/Pani/NiMn4 was investigated using cyclic voltammetry, chronoamperometry, and electrochemical impedance. The kinetic parameters such as diffusion coefficient, Tafel slope, charge transfer coefficient, and surface coverage were calculated to choose the best electrocatalysts toward UEO in alkaline solution. The anodic current of new electrodes achieved about 16 mA.cm−2 at potential of 550 mV (vs. Ag/AgCl). Density functional theory studies (DFT) have been carried out to assess the adsorption energy between polyaniline (Pani) and the metal oxides.

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“…The calculated diffusion coefficient was represented in Table 4, and the highest value was recorded at G/Pani/NiMn2 electrocatalyst equal 2.47

\times

10 −6 mol cm −2 . Accordingly, the resultant diffusion coefficient is comparable with other catalysts mentioned in urea electrooxidation based on nickel catalysts like 2.62

\times

10 −7 , 1.11

\times

10 −5 , and 2.21

\times

10 −6 cm 2 s −1 for Pani/LNO‐CNT, [56] Ni−Co, [57] and Ni−Mo, [58] respectively.…”

Section: Resultssupporting

confidence: 76%

NiO‐MnOx/Polyaniline/Graphite Electrodes for Urea Electrocatalysis: Synergetic Effect between Polymorphs of MnOx and NiO.

et al. 2022

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“…Thus, it can be inferred that due to the presence of surface terminations like -O, -F, and -OH on MXene surface, good interfacial contact is built between MXene and Co 3 O 4 nanoparticles which prevents the adsorption of CO with the Co 3 O 4 , which further reduces site-blocking. 75 These -OH ions react with the CO intermediates to form CO 2 and help in releasing the active sites from the intermediates and maintaining the durability of the catalysts.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Enabling methanol oxidation by an interacting hybrid nanosystem of spinel Co₃O₄ nanoparticle decorated MXenes

Baruah

Deb

2022

Dalton Trans.

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“…It can also be used to investigate the diffusion-controlled reactions, electrochemical activity, and stability of the working electrode. 84 The current density of the modified electrode is enhanced compared to that of the bare GC electrode due to the electrooxidation of urea. The initial decrease in the current intensity is due to diffusion polarization.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The chronoamperometry measurement involves detection of the resulted current as a function of time under the applied oxidation potential. It can also be used to investigate the diffusion-controlled reactions, electrochemical activity, and stability of the working electrode . The current density of the modified electrode is enhanced compared to that of the bare GC electrode due to the electrooxidation of urea.…”

Section: Results and Discussionmentioning

confidence: 99%

Electrocatalytic Properties of 3D Hierarchical Graphitic Carbon–Cobalt Nanoparticles for Urea Oxidation

et al. 2020

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A 3D hierarchical graphitic carbon nanostructure encapsulating cobalt(0)/cobalt oxide nanoparticles (CoGC) has been prepared by solid-state pyrolysis of a mixture of anthracene and cobalt 2,2′-bipyridine terephthalate complex at 850 °C. Based on the Brunauer–Emmett–Teller (BET) and Barrett–Joyner–Halenda (BJH) methods, the prepared material has high surface area (186.8 m 2 g –1 ) with an average pore width of 205.5 Å. XPS reveals the functionalization of carbon with different oxygen-containing groups, such as carboxylic acid groups. The presence of metallic cobalt nanoparticles with cubic and hexagonal crystalline structures encapsulated in graphitized carbon is confirmed using XRD and TEM. Raman spectroscopy indicates a graphitization degree of I D / I G = 1.02. CoGC was cast onto a glassy carbon electrode and used for urea electrooxidation in an alkaline solution. The electrochemical investigation shows that the newly prepared CoGC has a promising electrocatalytic activity toward urea. The specific activity is 128 mA cm –1 mg –1 for the electrooxidation of 0.3 M urea in 1 M KOH at a relatively low onset potential (0.31 V vs Ag/AgCl). It can be mainly attributed to the morphological structure of carbon and the high reactivity of cobalt nanoparticles. The calculated charge-transfer resistance, R ct , of the modified electrode in the presence of urea (10.95 Ω) is significantly lower than that in the absence of urea (113.5 Ω), which indicates electrocatalytic activity. The value of charge-transfer rate constant, k s , for the anodic reaction is 0.0058 s –1 . Electrocatalytic durability in 1000 s chronoamperometry of the modified electrode suggests high structure stability. The modified electrode retained about 60% of its activity after 100 cycles as indicated by linear sweep voltammetry.

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Lanthanum nickel oxide nano-perovskite decorated carbon nanotubes/poly(aniline) composite for effective electrochemical oxidation of urea

Cited by 37 publications

References 43 publications

NiO‐MnOx/Polyaniline/Graphite Electrodes for Urea Electrocatalysis: Synergetic Effect between Polymorphs of MnOx and NiO.

NiO‐MnOx/Polyaniline/Graphite Electrodes for Urea Electrocatalysis: Synergetic Effect between Polymorphs of MnOx and NiO.

Enabling methanol oxidation by an interacting hybrid nanosystem of spinel Co₃O₄ nanoparticle decorated MXenes

Electrocatalytic Properties of 3D Hierarchical Graphitic Carbon–Cobalt Nanoparticles for Urea Oxidation

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Lanthanum nickel oxide nano-perovskite decorated carbon nanotubes/poly(aniline) composite for effective electrochemical oxidation of urea

Cited by 37 publications

References 43 publications

NiO‐MnOx/Polyaniline/Graphite Electrodes for Urea Electrocatalysis: Synergetic Effect between Polymorphs of MnOx and NiO.

NiO‐MnOx/Polyaniline/Graphite Electrodes for Urea Electrocatalysis: Synergetic Effect between Polymorphs of MnOx and NiO.

Enabling methanol oxidation by an interacting hybrid nanosystem of spinel Co3O4 nanoparticle decorated MXenes

Electrocatalytic Properties of 3D Hierarchical Graphitic Carbon–Cobalt Nanoparticles for Urea Oxidation

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Enabling methanol oxidation by an interacting hybrid nanosystem of spinel Co₃O₄ nanoparticle decorated MXenes