| Electrodeposition of Ni-Cr Alloy on/in the Poly Eriochrome Black T/Graphene Oxide Nanosheet/ GCE as a New Electrocatalyst for Electro-oxidation of Ethanol |
| کد مقاله : 1110-CNF (R3) |
| نویسندگان |
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سارا پاشازاده *، بیوک حبیبی، پریا جعفری ناصر 2 گروه شیمی، دانشکده علوم، دانشگاه شهید مدنی آذربایجان، تبریز 53714-161، ایران |
| چکیده مقاله |
| Direct alcohol fuel cells (DAFCs) have several advantages in comparison with other types of fuel cells: high energy density, simpler system design, and no need for high pressures or temperatures. Therefore, DAFCs have many stationery and portable applications in different fields, since they have low noise and thermal signatures, no toxic effluent, and high theoretical and higher specific energy density [1]. Ethanol is the most common fuel used in DAFCs, because of its many benefits such as low cost, easy handling, nontoxicity, high energy efficiency, and density (8 kW h kg-1) and can be obtained in great quantity from renewable resources. Most importantly, ethanol is a green fuel that can be made through the fermentation process of sugar-containing sources such as sugar cane, wheat, corn, or cellulose-containing raw materials such as grass and straw [2]. One of the key parameters affecting the performance of direct ethanol fuel cells (DEFC) is the electrocatalytic oxidation kinetics of ethanol. This subject is still a challenge for a group of scholars. The electrode material in this process is a significant factor and the best results are obtained when an effective electrocatalyst is used. One of the metal structures at electrode catalysts is bimetallic nanoparticles (bi-MNPs). Nickel is an electro-catalytic metal in the fuel cells and the catalytic oxidation of alcohols is an important application of nickel alloys [3]. In this study, we attempt to explore the effect of Ni-Cr alloys and poly eriochrome black T/ graphene nanosheets modified glassy carbon electrode (Ni-Cr nano alloy/PEBT/GONs/GCE) as a new, simple, and sensitive anodic catalyst for ethanol oxidation in alkaline media. The structural and morphological characterization of the Ni-Cr nano alloy/PEBT/GONs/GCE nanocomposite was analyzed using several techniques, such as X-ray diffraction (XRD), EDS, scanning electron microscopy (SEM), and some electrochemical techniques. The electrochemical performance of the Ni-Cr nano alloy/PEBT/GCE is considered by cyclic voltammetry (CV) and chronoamperometry techniques. The results of the experiments revealed that the Ni-Cr nano alloy on the PEBT/GONs, Ni-Cr nano alloy/PEBT/GONs/GCE, shows more electrocatalytic activity than the GO nanosheets support. This high electrocatalytic efficiency of the Ni-Cr nano alloy/PEBT/GONs/GCE can be attributed to the large specific surface area and unique structure of GONs that is being used as support. The influence of some experimental agents on the electrocatalytic activity of the Ni-Cr nano alloy/PEBT/GONs/GCE was investigated and the optimal conditions were suggested. The obtained results of electrochemical measurements revealed that the Ni-Cr nano alloy/PEBT/GONs/GCE electrocatalyst remarkably shifted the onset potential (Eonset) to lower potentials and significantly increased the peak current density (Jpa). The simple preparation method, stability, and lower price of the present electro-catalyst, Ni-Cr nano alloy/PEBT/GONs/GCE, offers a promising strategy for the development of high-performance non-platinum electrocatalyst for further applications in the direct ethanol fuel cell. |
| کلیدواژه ها |
| Keywords: Ethanol, Fuel cells, Electrocatalytic oxidation, Poly eriochrome blak, Ni-Cr nano alloy |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |