Electrosynthesis of hierarchical Cu2O–Cu(OH)2 nanodendrites supported on carbon nanofibers/poly(para-phenylenediamine) nanocomposite as high-efficiency catalysts for methanol electrooxidation

Halim, El Mahdi; Perrot, Hubert; Sel, Ozlëm; Debiemme‐Chouvy, Catherine; Lafdi, Khalid; Rhazi, Mama El

doi:10.1016/j.ijhydene.2021.03.119

Cited by 22 publications

(14 citation statements)

References 84 publications

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“…This behavior is principally attributed to the high surface area of the CNT coating, resulting in improved electrical properties of the nanocomposite. 38,39 The obtained result is in agreement with the earlier reports. 40,41 Then, the resulting films were characterized using FEG-SEM coupled to EDX detector.…”

Section: Preparation and Characterization Of Cnt/popd Nanocompositessupporting

confidence: 93%

Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry

Halim

Demir‐Cakan

Perrot

et al. 2022

The Journal of Chemical Physics

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To reach a deeper understanding of the charge storage mechanisms of electrode materials is one of the challenges towards improving its energy storage performance. Herein, we investigate the interfacial ion exchange of a composite electrode made of carbon nanotube/poly( ortho-phenylenediamine) (CNT/P oPD) in a 1M NaCl aqueous electrolyte via advanced electrogravimetric analyses based on electrochemical quartz crystal microbalance (EQCM). Classical EQCM at different scan rates of the potential revealed the complex electrogravimetric behavior, likely due to multi-species participation at different temporal scales. Thereafter, in order to better understand the behavior of each species (ion, counter ion, co-ions) in the charge compensation mechanism, the electrogravimetric impedance spectroscopy analysis (also called ac-electrogravimetry) was pursued. Ac-electrogravimetry revealed the role of each species where Na+ cations, Cl- anions as well as protons participate in the charge compensation mechanism of the CNT/P oPD composite, with different kinetics and proportions. The water molecules, with opposite flux direction with the cations, are also detected suggesting their exclusion during cationic species transfer. Having analyzed ac-electrogravimetry responses in depth, the positive synergistic interaction between the CNT and the P oPD is highlighted, revealing the improved accessibility of species to new sites in the composite.

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Section: Preparation and Characterization Of Cnt/popd Nanocompositessupporting

confidence: 93%

Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry

Halim

Demir‐Cakan

Perrot

et al. 2022

The Journal of Chemical Physics

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“…This suggests that the NPCu 1.75 Ag catalyst could serve as a durable electrode. The reasons why the current increases during the first 10 min could be explained as follows: [1b,10c] (a) Catalytic oxidation of methanol is a surface catalytic process. At the initial stage, the NPCu 1.75 Ag catalyst was further activated in alkaline mixed solution, which would bring out more active reaction sites and thus result in a gradually current increase.…”

Section: Resultsmentioning

confidence: 99%

The Tunable and Efficient Nanoporous CuAg Alloy Catalysts Toward Methanol Oxidation Reaction Synthesized by Electrochemical Dealloying of Metallic Glassy Precursors

Yang

Han

et al. 2023

Chemistry A European J

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nanoporous CuAg (NPCuAg) alloy catalysts with various Cu/Ag ratios are prepared by electrochemical dealloying of metallic glassy (MG) precursors. All dealloyed samples exhibit homogenous nanoporous structure and element composition distribution. After systematically evaluating their electrocatalytic performance toward MOR, it was found that the catalytic activity of the NPCuAg catalysts is enhanced along with the increase of Cu/Ag ratio, which may be attributed to the more exposed active reaction sites derived from high surface area of nanoporous structure and the optimal synergistic effect. Thus, the NPCu 1.75 Ag alloy catalyst presents the best methanol electro-oxidation properties, including a high current density of 397.2 mA cm À 2 and good operation stability that retaining 84.5 % catalytic activity even after 7200 s. These results outperform most reported copper-based MOR catalysts in alkaline methanol solution. Considering these advantages, the designed electrodes are expected to be promising catalysts for alkaline DMFCs applications.

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“…22 The potential dependence interpretation of the Nyquist plot for the EOR on the quaternary catalyst Pd/BM-BOCC was also executed at different constant CA study manifests greater quasi-stationary current density of the quaternary heterostructure electrode (Pd/BM-BOCC) after 6000 s of operation, which is 1.5 and 3.4 times greater than that of Pd/CuO (392.4 mA mg −1 Pd) and Pd/C (172.3 mA mg −1 Pd) catalysts, respectively, indicating that the addition of bismuth subcarbonate, bismuth molybdate, and CuO as supports to the principal catalyst Pd facilitates the EOR by the removal of the adsorbed CO intermediates and exhibits excellent stability and enhanced synergistic effect for photo-electrocatalytic ethanol oxidation under visible light. 48,85,86 Figure 8b presents the regular increase of forward peak current density of the Pd/BM-BOCC/C electrode up to 150 cycles and achieves a maximum current of 882.2 and 1443.2 mA mg −1 Pd in the dark and light, respectively. Then, the peak current density decreases sluggishly and the stability test shows that the quaternary catalyst loses only 9.8 and 7.7% of its maximum current density after 500 cycles CV in the dark and light, respectively, indicating that light energy is more beneficial in establishing stability.…”

Section: Structural and Morphological Characterizationmentioning

confidence: 94%

“…Recently, Wang et al synthesized a CuO/Bi 2 MoO 6 hybrid nanosheet for toluene oxidation under solar radiation. In the literature, several studies reported that the copper oxide-supported Pd catalyst exhibits excellent catalytic activity and stability in the EOR, ,,− facilitates the breaking of the C–C bond, and promotes the adsorption of OH – species on the catalyst surface, which helps remove CO ads species during oxidation. − Thus, copper oxide-based electrocatalysts can be used as a most promising candidate for alkaline DEFCs.…”

Section: Introductionmentioning

confidence: 99%

Pd Nanoparticle-Decorated Novel Ternary Bi₂O₂CO₃-Bi₂MoO₆-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation

et al. 2023

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Recently, photo-electrooxidation of fuel using a noble metal−semiconductor junction has been one of the most promising approaches in fuel cell systems. Herein, we report the development of a Pd-supported Bi 2 MoO 6 -Bi 2 O 2 CO 3 -CuO novel ternary heterojunction for ethanol oxidation in alkali in the presence and absence of visible light. Various spectroscopic and microscopic characterization techniques confirm strong coupling between palladium nanoparticles and Bi 2 MoO 6 -Bi 2 O 2 CO 3 -CuO ternary heterojunction supports. The photo-electrocatalytic efficacy of the synthesized catalysts was inspected by cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy (EIS). The CV study reveals that the forward peak current density (in mA mg −1 of Pd) of the synthesized quaternary heterojunction was about 1482.5, which is 2.4, 4, and 4.6 times higher than that of Pd/CuO (608.3), Pd/Bi 2 MoO 6 -Bi 2 O 2 CO 3 (368.3), and similarly synthesized Pd catalyst (321.5) under visible light radiation. The best heterojunction catalyst shows 2.21-fold higher peak current density in visible light compared to that in dark. CA study reveals that after operation for 6000 s, the current density of the quaternary electrode is 1.5 and 3.4 times greater than that of Pd/CuO and Pd/C catalysts, respectively. The greater photocurrent response, lower photoluminescence (PL) emission intensity, and smaller semicircle arc in the Nyquist plot of the quaternary catalyst demonstrate the efficient segregation and higher charge transfer conductance of photogenerated charges to facilitate the photo-electrooxidation process of ethanol. The stability test shows that the quaternary catalyst loses only 9.8 and 7.7% of its maximum current density after 500 cycles of CV operation in the dark and light, respectively, indicating that light energy is more beneficial in establishing high stability. The dramatic enhancement of the photo-electrocatalytic activity of the quaternary electrode is owing to the lower band gap, high ECSA, enhanced charge separation of photogenerated carriers (e − −h + ), and all cocatalytic support of Bi 2 MoO 6 , Bi 2 O 2 CO 3 , and CuO in Pd/ Bi 2 MoO 6 -Bi 2 O 2 CO 3 -CuO under visible light radiation. The morphology and structure of the used quaternary catalyst are tested using FESEM and PXRD. Finally, ex situ FTIR spectroscopy and HPLC techniques help understand the ethanol electrooxidation reaction mechanism.

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Electrosynthesis of hierarchical Cu2O–Cu(OH)2 nanodendrites supported on carbon nanofibers/poly(para-phenylenediamine) nanocomposite as high-efficiency catalysts for methanol electrooxidation

Cited by 22 publications

References 84 publications

Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry

Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry

The Tunable and Efficient Nanoporous CuAg Alloy Catalysts Toward Methanol Oxidation Reaction Synthesized by Electrochemical Dealloying of Metallic Glassy Precursors

Pd Nanoparticle-Decorated Novel Ternary Bi₂O₂CO₃-Bi₂MoO₆-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation

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Electrosynthesis of hierarchical Cu2O–Cu(OH)2 nanodendrites supported on carbon nanofibers/poly(para-phenylenediamine) nanocomposite as high-efficiency catalysts for methanol electrooxidation

Cited by 22 publications

References 84 publications

Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry

Interfacial charge storage mechanisms of composite electrodes based on poly(ortho-phenylenediamine)/carbon nanotubes via advanced electrogravimetry

The Tunable and Efficient Nanoporous CuAg Alloy Catalysts Toward Methanol Oxidation Reaction Synthesized by Electrochemical Dealloying of Metallic Glassy Precursors

Pd Nanoparticle-Decorated Novel Ternary Bi2O2CO3-Bi2MoO6-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation

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Pd Nanoparticle-Decorated Novel Ternary Bi₂O₂CO₃-Bi₂MoO₆-CuO Heterojunction for Enhanced Photo-electrocatalytic Ethanol Oxidation