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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

Abstract : The development of highly efficient catalysts using inexpensive and earth-abundant metals is a crucial factor in a large-scale commercialization of direct methanol fuel cells (DMFCs). In this study, we explored a new catalyst based on copper nanodendrites (CuNDs) supported on carbon nanofibers/poly (para-phenylenediamine) (CNF/PpPD) nanocomposite for methanol oxidation reaction (MOR). The catalyst support was prepared on a carbon paste electrode by electropolymerization of para-phenylenediamine monomer on a drop-cast carbon nanofibers network. Afterwards, CuNDs were electrodeposited on the nanocomposite through a potentiostatic method. The morphology and the structure of the prepared nanomaterials were characterized by transmission electron microscope, scanning electron microscope, energy dispersive X-ray, X-ray diffraction, and X-ray photoelectron spectroscope. The results suggested that a three-dimensional nanodendritic structure consisting of Cu2O and Cu(OH)2 formed on the hybrid CNF/PpPD nanocomposite. The catalytic performance of CuNDs supported on CNF, PpPD and CNF/PpPD was evaluated for MOR under alkaline conditions. The CNF/PpPD/CuNDs exhibits a highest activity (50 mA cm−2) and stability toward MOR over 6 h, with respect to CNF/CuNDs (40 mA cm−2) and PpPD/CuNDs (36 mA cm−2). This inexpensive catalyst with high catalytic activity and stability is a promising anode catalyst for alkaline DMFC applications.
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https://hal.archives-ouvertes.fr/hal-03238471
Contributor : Véronique Martin <>
Submitted on : Thursday, May 27, 2021 - 10:22:05 AM
Last modification on : Friday, May 28, 2021 - 3:33:13 AM

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El Mahdi Halim, Hubert Perrot, Ozlem Sel, Catherine Debiemme-Chouvy, Khalid Lafdi, et al.. Electrosynthesis of hierarchical Cu2O–Cu(OH)2 nanodendrites supported on carbon nanofibers/poly(para-phenylenediamine) nanocomposite as high-efficiency catalysts for methanol electrooxidation. International Journal of Hydrogen Energy, Elsevier, 2021, 46 (38), pp.19926-19938. ⟨10.1016/j.ijhydene.2021.03.119⟩. ⟨hal-03238471⟩

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