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首页> 外文会议>Energy Harvesting and Storage: Materials, Devices, and Applications VI >Performance study of sugar-yeast-ethanol bio-hybrid fuel cells
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Performance study of sugar-yeast-ethanol bio-hybrid fuel cells

机译：糖-酵母-乙醇生物混合燃料电池的性能研究

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摘要

Renewable alternatives to fossil hydrocarbons for energy generation are of general interest for a variety of political, economic, environmental, and practical reasons. In particular, energy from biomass has many advantages, including safety, sustainability, and the ability to be scavenged from native ecosystems or from waste streams. Microbial fuel cells (MFCs) can take advantage of microorganism metabolism to efficiently use sugar and other biomolecules as fuel, but are limited by low power densities. In contrast, direct alcohol fuel cells (DAFCs) take advantage of proton exchange membranes (PEMs) to generate electricity from alcohols at much higher power densities. Here, we investigate a novel bio-hybrid fuel cell design prepared using commercial off-the-shelf DAFCs. In the bio-hybrid fuel cells, biomass such as sugar is fermented by yeast to ethanol, which can be used to fuel a DAFC. A separation membrane between the fermentation and the DAFC is used to purify the fermentate while avoiding any parasitic power losses. However, shifting the DAFCs from pure alcohol-water solutions to filtered fermented media introduces complications related to how the starting materials, fermentation byproducts, and DAFC waste products affect both the fermentation and the long-term DAFC performance. This study examines the impact of separation membrane pore size, fermentation/fuel cell byproducts, alcohol and salt concentrations, and load resistance on fuel cell performance. Under optimized conditions, the performance obtained is comparable to that of a similar DAFC run with a pure alcohol-water mixture. Additionally, the modified DAFC can provide useable amounts of power for weeks.
机译：出于各种政治，经济，环境和实际原因，人们普遍对矿物燃料的可再生替代能源产生了广泛的兴趣。特别地，来自生物质的能量具有许多优势，包括安全性，可持续性以及从天然生态系统或废物流中清除的能力。微生物燃料电池（MFCs）可以利用微生物的新陈代谢来有效地利用糖和其他生物分子作为燃料，但受到低功率密度的限制。相反，直接酒精燃料电池（DAFC）则利用质子交换膜（PEM）来以更高的功率密度从酒精中发电。在这里，我们研究了使用商业现货DAFC制备的新型生物混合燃料电池设计。在生物混合燃料电池中，酵母等将生物质（如糖）发酵成乙醇，可用于为DAFC燃料。发酵和DAFC之间的分离膜用于纯化发酵液，同时避免任何寄生功率损失。但是，将DAFC从纯酒精水溶液转移到过滤后的发酵培养基会带来与起始原料，发酵副产物和DAFC废物如何影响发酵和长期DAFC性能有关的复杂性。这项研究检查了分离膜孔径，发酵/燃料电池副产物，酒精和盐浓度以及负载阻力对燃料电池性能的影响。在优化的条件下，所获得的性能可与使用纯醇-水混合物进行的类似DAFC进行比较。此外，修改后的DAFC可以提供数周的可用电量。

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