| Investigation of anode electrocatalyst for anion-exchange membrane fuel cell |
| کد مقاله : 1043-CNF |
| نویسندگان |
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مرضیه غلامیان *1، محمد ژیانی2 1دانشگاه صنعتی اصفهان 2دانشکده شیمی، دانشگاه تربیت مدرس |
| چکیده مقاله |
| The activity and durability of anode catalysts can be regarded as one of the important factors in the development of direct ethanol fuel cells (DEFCs) technologies. Pd-based catalysts have been considered for ethanol oxidation reaction (EOR) in alkaline media for their high catalytic activity and stability [1]. Pd catalysts activity may, however, decline following the long-term running because Pd nanoparticles (NPs) with a small size could lead to the formation of agglomerates; they are easily deformed or transformed; atomic migration in corrosive electrochemical media could also occur due to their high surface energy [2]. Further, Pd catalysts can be poisoned with carbonaceous intermediates; it can cause slow ethanol oxidation kinetics. As a result, many studies have been performed for EOR on the Pd-M binary and ternary catalysts (M: Cu, Sn, Ni, Ag, Mo, Zn, Co, V, …) with different substrates; mostly carbon (C), carbon nanotube (CNT) and reduced graphene oxide (rGO) [3]. The electronic structure study of the Pd-Cu bimetal catalyst could lead to the stability and activity of catalyst for EOR using binding energy positions investigation of Pd and Pd-Cu, thereby confirming the charge transfer between the two metals in the catalyst structure [4]. Moreover, CH3CO and CO intermediates are strongly adsorbed on the palladium surface; however, adsorbed hydroxyl groups on the cupper sites of Pd-Cu catalysts can decrease the energy barrier of the adsorbed intermediates, eventually leading to the ethanol oxidation. Fig. 1 displays anion-exchange membrane fuel cell and its assembly. The evaluation of ethanol fuel cell has been performed at different concentrations for the Pd-Cu/rGO synthesized catalyst on the nickel foam as an anode electrode and the Fe-Co/KB nanocatalyst on a carbon cloth substrate as a cathode electrode in an alkaline media at a temperature of 34 ₒC. Fig.1 Anion-exchange membrane fuel cell and its assembly. Fig.2 shows comparison of the electrochemical performance of this catalyst using power curves. At low current densities, power density is fixed in all of the concentrations. At moderate current densities, maximum of power density display 139, 178, 320, 342, 400, 459 µW cm-2 for concentrations of 5, 10, 20, 30, 40, 50 mM. At high current densities, power density is decreased for all of the concentrations. Fig. 2 Power density curves in different concentrations of ethanol in alkaline medium |
| کلیدواژه ها |
| Fuel cell-based breath alcohol analyzer (FCBrAA), Ethanol oxidation reaction (EOR), Reduced graphene oxide (rGO), Palladium nanoparticles (Pd NPs), Palladium-copper alloy (Pd-Cu) alloy |
| وضعیت: چکیده برای ارائه به صورت پوستر پذیرفته شده است |