| Electrocatalytic Oxidation of Formaldehyde for Fuel Cells onto Carbon Paste Electrode Modified with Ni-Co MOF on/in the Heteroatoms Doped Graphene |
| کد مقاله : 1109-CNF |
| نویسندگان |
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سارا پاشازاده *1، بیوک حبیبی1، لطفعلی سقط فروش2، ذوالفقار رضوانی1، علی پاشازاده3 12 گروه شیمی، دانشکده علوم، دانشگاه شهید مدنی آذربایجان، تبریز 53714-161، ایران 2عضوهیئت علمی دانشگاه پیام نور مرکز خوی 3دانشجوی دکترای دانشگاه شهید مدنی آذربایجان تبریز |
| چکیده مقاله |
| The electrocatalytic oxidation of small organic molecules, such as methanol, formaldehyde (CH2O) and formic acid is a reaction subject to intense investigation due to its possible application in fuel cell technology. The electro-oxidation of CH2O is connected with technological improvement of direct methanol fuel cells (DMFCs) [1, 2]. Development of efficient electrocatalysts for oxidation of small organic molecules such as formaldehyde and methanol has received considerable attention owing to their use in fuel cells. Over the past decade, extensive work has been done toward the investigation of metal organic framework (MOF) for various applications such as gas adsorption, separation and catalysis [3, 4]. In this study, we attempt to explore the effect of Ni(II)-Co MOF and carbon nanoparticles modified carbon paste electrode (Ni(II)-Co MOF/NDGONs/CPE) as a new, simple and sensitive anodic catalyst for formaldehyde oxidation in alkaline media. The material was characterized by different techniques including surface and structural (FE-SEM and XRD) and electrochemical techniques (CV and chronoamperometric). The results of the experiments revealed that the Ni(II)-Co MOF on the NDGONs, Ni(II)-Co MOF/NDGONs/CPE, shows more electrocatalytic activity than the NDGONs nanosheets support. The high electrooxidation activity and superior stability for formaldehyde oxidation are obtained. The results display that the modified electrode (Ni(II)-Co MOF/NDGONs/CPE) can improve the oxidation of CH2O by a catalytic process through a decrease in overpotential and overcome the low kinetic of reaction in comparison with Ni(II)-Co MOF/CPE. The effects of scan rate and formaldehyde concentration on the electrocatalytic oxidation of formaldehyde were also investigated at the surface of modified electrode. The diffusion coefficient (D= 1.32×10-6cm2s-1), and some kinetic parameters such as the transfer coefficient (α= 0.54) and also second-order rate constant (k= 4.73×104 cm3mol-1s-1) of formaldehyde were calculated. The cyclic voltammetry test revealed that the current density of CH2O electrooxidation increases remarkably on the surface of Ni(II)-Co MOF/NDGONs/CPE. The present investigation reveals that the Ni(II)-Co MOF/NDGONs /CPE is a promising electrocatalyst for the formic acid electro-oxidation reaction in FCs. |
| کلیدواژه ها |
| Keywords: Formaldehyde, Fuel cells, Electrocatalytic Oxidation, Metal organic framework, Modified electrode |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |