Study of Electrochemical Deposition of Platinum Nanoelectrocatalyst for Glucose Oxidation Reaction in Biofuel Cell

Biofuel cells (BFCs) are special kind of fuel cells, employing enzymes as the biocatalyst for the conversion of chemical energy into electrical energy [1]. Although, BFCs have been known forlong time [2], they catch enormous attention only in the recent years and are expected to be oneof the promising next generation green energy devices. BFCs have numerous applications in the fields such as implantable devices [3], waste water treatment [4], drug delivery [5] andbiosensors [6]. Besides, the fuels for BFCs are from renewable energy sources usually sugars or organic acids and most often glucose [7]. Glucose is produced in abundance from both naturally occurring plants and industrial processes. The energy density of glucose on complete oxidationto CO2 via 24-electron transfer is 2.87 ×106 J mol-1 [8]. Glucose is nontoxic, non-flammable, odorless and renewable. These properties make glucose an attractive fuel for various applications, particularly for portable electronic devices [9]. In this research, cyclic voltammetry(CV) method (voltage range: -0.2 to 1.2 V versus Ag/AgCl and 100 mVs-1 scan rate) was used for platinum electrodeposition on carbon rod and solution included of H3PO4 (0.5 M) and H2PtCl6 (0.5mM). Scan numbers in CV method were varied 10 up to 60 at this work.For evaluating prepared platinum electrocatalyst for glucose oxidation reaction, CV and Linear sweep voltammetry (Lsv) methods were used in glucose solution (0.5 M, KOH (0.5 M)) at 25oC (Fig. 1&2). As it was shown, the scan number of CV method in preparation platinum electrocatalyst processes affects on efficiency of fabricated electrodes for glucose oxidation reaction. According our results the 30 scan number in CV method is optimized condition forpreparation platinum electrocatalyst. Fabricated electrode has good activity and power density for glucose oxidation reaction in biofuel Cell.

کلیدواژه ها:

Direct glucose fuel cell ، Bio fuel cell ، Nano electro catalyst ، Platinum ، Electro oxidation reaction ، Electrodeposition ، Cyclic voltammetry