Tue, 2013-04-09 14:57 | 
Glucose is the most abundant carbohydrate in nature easily produced by photosynthesis in plants such as sugar cane or corn and by a large amount of waste biomass that is generated by agricultural
activities [1,2]. Glucose’s theoretical energy is 4430 Wh kg-1 and its complete oxidation to carbon dioxide can produce 24 electrons in accordance with the following chemical equations:
Theoretical anode reaction: C6H12O6+24OH---> 6CO2+18H2O+24e- (1)
Theoretical cathode reaction: 6O2+12H2O+24e- --> 24OH- (2)
Overall reaction: C6H12O6+ 6O2 --> 6CO2+ 6H2O (3)
A potential approach to obtain energy from glucose is to be fed into a fuel cell, which directly oxidize the fuel to generate electricity, such as direct methanol and direct ethanol fuel cells. The development of glucose fuel cells research today has mainly two purposes: i) the in vivo applications and ii) the development of highly stable and efficient electrocatalysts. The fuel (glucose) could be withdrawn virtually without limit from the flow of blood providing a long-term or even permanent power supply for such devices as pacemakers, glucose sensors for diabetics or small valves for bladder control. On this purpose many attempts have been focused on the development of enzymatic and microbial fuel cells [3-9]. In the past few decades most research in the field has been focused on immobilization methods for enzymatic catalysts in an effort to increase the lifetime of glucose fuel cells. Enzymatic catalysts for glucose/O2 fuel cells have excellent selectivity and can produce power densities of the order of several mW cm-2. However they have very short lifetime, typically less than thirty days, due to the fragile nature of the enzymes and poor immobilization techniques. This makes them generally unsuitable for long-term implantable applications despite having been successfully tested in-vivo. Thus, recently, it is observed an increase interest in non-enzymatic fuel cells that use mainly platinum [10-15] and gold alloys [10,15-17] as anodes electrocatalysts and usually activated carbon as cathode electrocatalyst [18-20] . The researches’ results prove that such fuel cells have shown good time stability and have been successfully tested in-vivo [21] . The biggest challenge however remains the poor anode selectivity towards glucose oxidation in presence of oxygen. Recently, Kerzenmacher et al. [22-24] proposed novel direct glucose fuel cell structures fabricating Raney platinum and Raney platinum doped with zinc electrodes as anodes and thin layer platinum as cathode, examining also their compatibility with a body tissue environment. Direct electrooxidation of glucose on non-enzymatic noble metal electrodes has been studied in the last few years as the alternative solution to the complexity and drawbacks of the microbial and enzymatic fuel cells. Many of them have been focused on Pt [11,25], Au [16,26] and on their bi-metallic catalysts, Pt-Bi [19] , Pt-Pd [27], Pt-Ru [18], Pt-Au [28,20], Ag-Au [29-31] and tri-metallic catalysts [32] .
The present PhD study aims to investigate for the first time in the literature the electrocatalytic activity of low metal loading 20%wt Pdx-(Sn, Rh & Ru) on carbon bi-metallic electrocatalysts for glucose electrooxidation. The preparation and physical characterization of different electrocatalysts scanning electron microscope (SEM) and X-ray diffraction (XRD) are reported. Glucose electro-oxidation on the examined electrocatalysts in alkaline electrolyte (KOH) are electrochemically characterized using cyclic voltammetry (CV) and chronoamperometry (CA) technique. Additionally, will be used the RDE technique for evaluating the electrochemical activity of the electrocatalysts towards glucose electrooxidation in presence of oxygen.
References
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