Abstract
Two types of direct methanol fuel cells (DMFC) were evaluated under constant voltage discharge for long term operation. One type is a DMFC single cell, tested for 2600 hours at 0.45V and 70 oC; and the other is an air-breathing DMFC bi-cell, tested for 5000 hours at 0.6V and room temperature (20 oC). A concept of cumulative capacity and cumulative energy is proposed to quantitatively analyze the long term discharge data. The single cell, which has run for a shorter time, shows higher cumulative energy (78 Wh•cm-2•cell-1) than that of the bi-cell (47 Wh•cm- 2•cell-1). A phenomenon of delamination between the interface of electrode and electrolyte membrane was observed after long term operation. Hot-pressing the electrode was tried to fix the problem of delamination. The single cell after hot-pressing was tested again for 2800 hours under the same operating conditions. By summing the two discharges, a total cumulative energy of 154 Wh•cm-2•cell-1 is achieved.
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