- 學位論文
動態陽極設計對鋅顆粒燃料電池性能改善之研究
Study of Performance Improvement on Dynamic Anode Design of Zinc Particle Fuel Cell
摘要
本研究使用鋅顆粒取代傳統式的鋅板，搭配流動式電解液，在燃料桶出口端設置步進馬達，根據電池的電壓監控系統來控制步進馬達開啟時機，透過流動式電解液將燃料送入電池內，且在電池內設置鎳濾網集電網盒，將過小及無法反應的鋅顆粒可以通過集電網，流入廢料儲存桶，而還能釋放能量的鋅顆粒繼續在電池內反應，並在廢料儲存桶內設置濾網層，將無法反應的鋅顆粒留置在廢料儲存桶內，而電解液能通過濾網層，完成電解液循環，達到動態陽極設計之目的。 由實驗結果顯示，適當的鋅顆粒尺寸能提供電池良好的反應效率，隨著電流密度的增加，顆粒小的易有穿透隔離膜的現象，導致電池短路，反之50 wt% 調配的鋅顆粒有較好的反應效率。流動式電解液增加OH-濃度更新速度，但流速過快時，因顆粒未反應完成就被流動式電解液帶出電池，所以將電解液維持在30 ml/min ~ 100 ml/min有較佳電池性能產生。鎳濾網集電網盒能使電池集電面積增加並提升鋅顆粒使用效率，但密度過小或過大，都不利電池反應，因此30目的有較好的效果。而單電池最大功率達到19 W，對應的電流密度為500 mA/cm2，並進行400 mA/cm2 持續性給料測試，發現再帶出的過程中容易造成出口堵塞，導致陽極反應面積減少。故在鋅顆粒燃料電池的出口處需再加以調整及設計。
並列摘要
This research uses the zinc particle to replace the traditional zinc plate, installing a stepper motor on the outlet end of the fuel tank along with fluid electrolyte, controlling the open timing of the stepper motor according to the voltage monitoring system of the cell, and sending the fuel into the cell through the fluid electrolyte. In addition, we install a nickel-grid current collector in the cell, so the zinc particles which are too small to react can go through the current collector and flow into the waste fuel storage tank; the zinc particles which can still output energy will be retained in the cell. A layer of screen is installed inside the waste fuel storage tank in order to retain those zinc particles that are not able to react; besides, the electrolyte can flow through the screen and complete the electrolyte circle, thus to achieve the goal of dynamic anode design. The experiment result has shown that the zinc Particle in sufficient size can ensure a fine reacting efficiency. With the increase of current density, smaller zinc particles are more easily to pass through the separation, causing a short circuit of the cell; on the other hand, 50 wt% zinc particles can provide better reacting efficiency. The fluid electrolyte can increase the renewing speed of OH- concentration, but when the flowing speed is too fast, those particles which have not yet finished the reacting processes will be carried out of the cell by the electrolyte, thus maintaining the electrolyte between 30 ml/min ~ 100 ml/min can ensure a better performance of the cell. Nickel-grid current collector can help to increase the current collecting area of the cell and boost the efficiency of zinc particles; however, if the density is too large or too small, both conditions are unfavorable to the cell reaction, so setting the density at 30 can ensure a better efficiency. When the maximum power of a single cell reaches 19W, its’ corresponding current density is 500 mA/cm2; moreover, we continue to do the 400 mA/cm2 sustaining loading test and find that the output end is easily to be blocked during the process, causing the reduce of anode reacting area. In this case, the output end of the zinc particle fuel cell requires further design and adjustment.