| Energy Engineering |
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| Development of a miniature silicon wafer fuel cell using L-ascorbic acid as fuel |
| Jian WU, Zhi-yong XIAO, Yi-bin YING, Philip C.H. CHAN |
| School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, China; Department of Electrical and Electronic Engineering, Hong Kong University of Science and Technology, Hong Kong, China |
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Abstract In the current studies a miniature silicon wafer fuel cell (FC) using L-ascorbic acid as fuel was developed. The cell employs L-ascorbic acid and air as reactants and a thin polymer electrolyte as a separator. Inductively coupled plasma (ICP) silicon etching was employed to fabricate high aspect-ratio columns on the silicon substrate to increase the surface area. A thin platinum layer deposited directly on the silicon surface by the sputtering was used as the catalyst layer for L-ascorbic acid electro-oxidation. Cyclic voltammetry shows that the oxidation of L-ascorbic acid on the sputtered platinum layer is irreversible and that the onset potentials for the oxidation of L-ascorbic acid are from 0.27 V to 0.35 V versus an Ag/AgCl reference electrode. It is found that at the room temperature, with 1 mol/L L-ascorbic acid/PBS (phosphate buffered solution) solution pumped to the anode at 1 ml/min flow rate and air spontaneously diffusing to the cathode as the oxidant, the maximum output power density of the cell was 1.95 mW/cm2 at a current density of 10 mA/cm2.
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Received: 04 November 2007
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