Preparation of graphene oxide/molybdenum disulfide nanocomposite as a platinum-nickel electrocatalyst substrate

سال انتشار: 1401
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 147

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شناسه ملی سند علمی:

PEEL11_044

تاریخ نمایه سازی: 18 تیر 1401

چکیده مقاله:

In this study, graphene oxide/molybdenum disulfide (GO/MOS۲) nanocomposite was prepared using in-situ polymerization method. Next the platinum-nickel (Pt-Ni) was electrochemically decorated on GO/MOS۲ nanocomposite surface. Cyclic voltammetry (CV) was employed to evaluate the oxidation of ethanol. Results showed that Pt-Ni/GO/MOS۲ exhibits improved electrocatalytic activity ethanol oxidation. Enhanced active surface area of the Pt-Ni/GO/MOS۲ electrode (۲۲۵mA/cm۲) contributes to increase in current density values in the ethanol oxidation as compared to Pt-Pd electrocatalyst. The growing energy demand is one of the critical issues faced by the humanity in this era and massive combustion of fossil fuels has led to severe energy crisis and environmental pollution [۱]. Fuel cell is one of the thrust areas where research is active to solve the issue of energy crisis. Amongst the different types of fuel cells, direct ethanol fuel cell (DEFC) received considerable attention due to its superior specific energy, operational safety and low cost [۲]. In DEFC, the most commonly used catalyst for ethanol oxidation is platinum (Pt). Nonetheless, the large scale applications have seriously hindered because Pt is limited and expensive [۲]. Therewith, previous researches have revealed that the alloys of Pt which has a second metal (like Bi, Sn, Ru, Ni, and Pd) can speed up the oxidation of ethanol, decrease the Pt loading and also improve the CO tolerance of Pt [۲]. In the running research, Pt-Ni alloy was electrochemically deposited on the surface of GO/MOS۲in order to improve the performance of Pt-Ni modified carbon paste electrode (CPE) as anode catalyst for oxidation of ethanol. Produced electrocatalyst was characterized cyclic voltammograms to appraise the electro-activity of Pt-Ni/GO/MOS۲ electrode. The present study shows that the Pt-Ni/GO/MOS۲ nanoparticulate can be a promising catalyst for portable applications in DEFC in alkaline solution Fig. ۱ shows the stabilized cyclic voltammetry curves (CV's) recorded for methanol electro oxidation at the prepared electrode. Curves display a single peak during the positive-going sweep that is characteristic of the electro oxidation of MeOHads molecules on Pt based catalysts. After passing through the maximum, the current density decreases progressively due to platinum oxide formation and then starts to increase again due to incomplete alcohol oxidation. In the backward scan the corresponding oxidation peak is shifted to a less positive potential and the oxidation process proceeds with high reactivation currents. This anodic peak is attributed to the further removal/oxidation of adsorbed by-products and CO, and/or oxidation of alcohol molecules on the freed catalytic sites. The onset potential for methanol oxidation reaction on Pt-Ni/GO/MOS۲ catalysts occurred at -۰.۵V which indicates that Pt-Ni/GO/MOS۲nanocomposites improve kinetics of methanol electro oxidation. The specific peak current densities for methanol oxidation reaction were ۲۲۵mA/cm۲ for Pt-Ni/GO/MOS۲although, specific activity is directly related to the number of active sites on the catalyst surface and, the cathodic peak in the backward scan was detected that was related to the oxidation of remaining methanol and the removal of residual carbonaceous oxygen containing intermediates formed during the forward scan Fig. ۱. Cyclic voltammograms of the Pt-Ni/GO/MOS۲, Pt/GO/MOS۲, Pt-Ni, Pt-Ni/GOand Pt-Ni/MOS۲in ۰.۵ M KOH and ۱.۰ M methanol electrolyte at ۵۰ mV/s scan rate. The present study was designed to determine the influence of GO/MOS۲ on the electro catalytic activity of Pt-Nialloy nanoparticles synthesized for methanol oxidation. Cyclic voltammetry was employed to evaluate the catalytic performance of the supported alloy nanoparticles for methanol oxidation reaction. The results indicated that the GO/MOS۲ supported Pt-CoNi catalyst exhibits the best performance for methanol oxidation.

نویسندگان

Mohammad Soleimani Lashkenari

Fuel Cell Electrochemistry and Advanced Material Research Laboratory, Faculty of Engineering Modern Technologies, Amol University of Special Modern Technologies, Amol, ۴۶۱۶۸۴۹۷۶۷, Iran

Hamid Emadi

Department of Applied Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran

Fatemeh Tajik

Fuel Cell Electrochemistry and Advanced Material Research Laboratory, Faculty of Engineering Modern Technologies, Amol University of Special Modern Technologies, Amol, ۴۶۱۶۸۴۹۷۶۷, Iran