Electrogravimetric and electrochemical studies on new nanostructured materials based on carbon nanomaterials, conducting polymers and metal nanoparticles: Application for energy storage and conversion

Résumé

The objective of this Ph.D. thesis is to study new binary and ternary nanocomposites based on carbon nanomaterials, conducting polymer and metal particles for energy storage and conversion. The morphology and the composition of different nanocomposites are characterized by various spectroscopic and microscopic techniques. Thereafter, the nanocomposites are used as electrode materials for supercapacitors and direct methanol fuel cells. For the supercapacitors aspect, electrodes based on PoPD and on SWCNT/PoPD were synthesized on gold-patterned Quartz Crystal Microbalance and graphite plates. Their redox transformations and the ionic flux mechanisms were investigated in aqueous NaCl electrolyte via EQCM and ac-electrogravimetry. In order to correlate between the fundamental understandings and the performance of the electrode, the capacitive performance of PoPD and SWCNT/PopD films are tested in both 3-electrode cell a 2-electrode Swagelok cell. By determining the interfacial flux dynamics and as well as the relative proportions of species transferred at the electrode/electrolyte interface, our results contribute to the understanding of the charge-discharge process of PoPD polymer and SWCNT/PoPD nanocomposite, which have the desirable attributes for energy storage applications. For the direct methanol fuel cell aspect, a nanocomposites based on CNFs, PpPD and Ni Particles or Cu dendrites was prepared on Carbon Paste Electrode using a simple and rapid method. The effects of various parameters on the catalytic performance are studied in order to obtain an optimized composition of the nanocomposites. Then, their electrocatalytic effect for the methanol oxidation reaction (MOR) was studied in alkaline solution. The nanocomposites exhibit a good stability and a high catalytic effect towards MOR

Citer ce document

Accès au document

Ce document est hébergé sur son dépôt institutionnel d'origine.

Auteur(s)

Statistiques

Consultations : 2

Téléchargements : 0