Wu Chaoqun, Liu Linghao, Tang Kai, Chen Tao
School of Mechanical and Electronic Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei 430070, PR China.
Ultrason Sonochem. 2017 Jan;34:60-66. doi: 10.1016/j.ultsonch.2016.05.018. Epub 2016 May 12.
Direct methanol fuel cell (DMFC) is promising as an energy conversion device for the replacement of conventional chemical cell in future, owing to its convenient fuel storage, high energy density and low working temperature. The development of DMFC technology is currently limited by catalyst poison and methanol crossover. To alleviate the methanol crossover, a novel fuel supply system based on ultrasonic atomization is proposed. Experimental investigations on this fuel supply system to evaluate methanol permeation rates, open circuit voltages (OCVs) and polarization curves under a series of conditions have been carried out and reported in this paper. In comparison with the traditional liquid feed DMFC system, it can be found that the methanol crossover under the ultrasonic atomization feed system was significantly reduced because the DMFC reaches a large stable OCV value. Moreover, the polarization performance does not vary significantly with the liquid feed style. Therefore, the cell fed by ultrasonic atomization can be operated with a high concentration methanol to improve the energy density of DMFC. Under the supply condition of relatively high concentration methanol such as 4M and 8M, the maximum power density fed by ultrasonic atomization is higher than liquid by 6.05% and 12.94% respectively.
直接甲醇燃料电池（DMFC）作为一种能量转换装置，因其燃料存储方便、能量密度高和工作温度低，有望在未来取代传统化学电池。目前，DMFC技术的发展受到催化剂中毒和甲醇渗透的限制。为了减轻甲醇渗透，提出了一种基于超声雾化的新型燃料供应系统。本文对该燃料供应系统进行了实验研究，以评估一系列条件下的甲醇渗透率、开路电压（OCV）和极化曲线。与传统的液体进料DMFC系统相比，可以发现超声雾化进料系统下的甲醇渗透显著降低，因为DMFC达到了较大的稳定OCV值。此外，极化性能不会随液体进料方式而显著变化。因此，采用超声雾化进料的电池可以使用高浓度甲醇运行，以提高DMFC的能量密度。在4M和8M等高浓度甲醇供应条件下，超声雾化进料的最大功率密度分别比液体进料高6.05%和12.94%。
