磁力連動雙邊壓電式質子交換膜燃料電池堆之研究

Abstract

本研究發展一種利用壓電驅動原件製造一個空氣泵浦(Air-breathing)，以供應質子交換膜燃料電池(PEMFC)堆所需要的氧氣。利用永久磁鐵與壓電驅動原件結合的磁力去推動三個空氣泵浦。這樣的設計可以使空氣幫浦能同時為磁力連動雙邊壓電式質子交換膜燃料電池堆(後稱“bi-cell PZTmag-PEMFC stack”)的所有陰極流道板提供足夠的空氣。在操作條件40 V以及70 Hz時，當PZTmag與PDMSmag同時使用直徑6 mm厚度1 mm的磁鐵時，可以得到最大的位移量87 μm，耗能為0.03 W。最後經由實驗結果得知bi-cell PZTmag-PEMFC stack之淨輸出能量密度為0.1925 W cm-2，比較過去研究[1]的3顆bi-cell PZT-PEMFC，發電量淨輸出能量密度提高了20%，且體積與重量分別降低了68%以及76%。此外，與傳統雙極板流道設計的六顆串聯質子交換膜燃料電池相比[2]，本研究所設計之燃料電池在歐姆極化區損失的電壓降較小。

This study develops an air-breathing pump driven by a piezoelectric actuator to provide air for a Proton Exchange Membrane Fuel Cell (PEMFC) stack. Permanent magnets are combined with a piezoelectric actuator to drive three air breathing pumps using the magnetic force. This design enables the pump to simultaneously provide a sufficient amount of air to all the cathode flow field plate of a “bi-cell PZTmag–PEMFC stack”. When both the PZTmag and the PDMSmag used a magnet with a 6 mm diameter and 1 mm thickness, the maximum amplitude of 87 μm was produced under operating conditions of 70 Hz and 40 V, and the power consumption was 0.03 W. The resulting maximum net power density of the bi-cell PZTmag–PEMFC stack was 0.1925 W cm-2. Compared with the performance reported in previous research [1] on three bi-cell PZT-PEMFC, the net power density increased by 20%, and its volume and weight were reduced by 68% and 76%, respectively. Furthermore, this design has less voltage loss in ohmic polarization region compared with the traditional bipolar plate PEMFC stack when the cells are in series [2].