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Evaluation of the performance of zero-electrolyte-discharge microbial fuel cell based on the type of substrate

机译：基于基材类型评估零电解质放电微生物燃料电池的性能

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In MFCs that are used to generate electricity, the discharging of phosphate electrolyte is not economical and environmentally friendly. To address this issue, the concept of “zero-electrolyte-discharge” MFCs was developed. In this study, the performance of “zero-electrolyte-discharge” air-cathode MFCs were critically evaluated using different types of substrates (sugar, alcohol, fatty acid, and salt). A final power loss of 68% and 48% was observed for the glucose- and ethanol-fed MFCs, respectively. This power loss was found to be mainly due to the substantially increased internal resistances under decreased electrolyte pH that is induced by the fast production of acidic metabolites. Moreover, cathodic biofilm growth was found to cause a higher electrolyte pH at the cathodic catalyst layer, resulted in a lower open circuit voltage (OCV) and power density. Among the studied substrates, our results suggest that acetic acid is the most suitable candidate for the zero-electrolyte-discharge MFC system since it provides a stable electrolyte environment and least cathodic biofilm growth. The drawbacks of using sodium acetate as an MFC substrate have also been discussed and it is compared with acetic acid.
机译：在用于发电的MFC中，磷酸盐电解质的放电不经济且不环保。为了解决这个问题，开发了“零电解液放电” MFC的概念。在这项研究中，使用不同类型的基质（糖，酒精，脂肪酸和盐）严格评估了“零电解质放电”空气阴极MFC的性能。对于葡萄糖和乙醇喂养的MFC，最终功率损失分别为68％和48％。发现这种功率损耗主要是由于在酸性pH值快速产生引起的电解质pH降低下内阻显着增加。此外，发现阴极生物膜的生长会导致阴极催化剂层的电解质pH升高，从而导致开路电压（OCV）和功率密度降低。在研究的底物中，我们的结果表明，乙酸是零电解质放电MFC系统的最合适的候选物，因为它提供了稳定的电解质环境和最少的阴极生物膜生长。还讨论了使用乙酸钠作为MFC底物的缺点，并将其与乙酸进行了比较。

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