三维石墨毡阳极自呼吸微流体燃料电池性能数值模拟

发布时间：2018-12-11 02:40

【摘要】：针对采用三维石墨毡可渗透阳极的空气自呼吸无膜微流体燃料电池,建立了三维等温稳态数学模型,对电池中燃料及电解液的流动和传输、电极过程动力学及电荷传递过程进行了模拟,计算获得了具有石墨毡阳极的微流体燃料电池内的传质和燃料渗透特性,研究了石墨毡厚度及反应物(燃料和电解液)流量对电池性能的影响。结果表明:当入口流量为333μl·min-1时,采用石墨毡可渗透阳极相比碳纸和碳布可渗透阳极,极限电流密度和极限功率密度分别提升12%和50%;电池电压为0.8V时燃料渗透引起的寄生电流密度仅占电流密度的0.86%。电池性能随着石墨毡电极厚度增加而升高,但增幅逐渐减小;反应物流量增大,电池的性能先增加后逐渐趋于稳定。
[Abstract]:In this paper, a three-dimensional isothermal steady state mathematical model is established for the air self-breathing membrane free microfluid fuel cell with three dimensional graphite felt permeable anode. The flow and transmission of fuel and electrolyte in the cell are studied. The kinetics of electrode process and charge transfer process were simulated, and the mass transfer and fuel permeation characteristics in microfluid fuel cell with graphite felt anode were calculated. The effects of the thickness of graphite felt and the flow rate of reactants (fuel and electrolyte) on the performance of the battery were studied. The results show that when the inlet flow rate is 333 渭 l min-1, the limit current density and the limit power density of graphite felt permeable anode are increased by 12% and 50%, respectively, compared with those of carbon paper and carbon cloth permeable anode. The parasitic current density caused by fuel permeation is only 0.86% of the current density when the cell voltage is 0.8 V. The performance of the battery increases with the increase of graphite felt electrode thickness, but the increase decreases gradually, and the reaction mass flow increases, the performance of the battery increases first and then tends to be stable.
【作者单位】：重庆大学低品位能源利用技术及系统教育部重点实验室;重庆大学工程热物理研究所;
【基金】：国家杰出青年科学基金项目(51325602) 国家自然科学基金重点国际(地区)合作研究项目(1620105011);国家自然科学基金项目(5313762)~~
【分类号】：TM911.4

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