Iron-streptomycin derived catalyst for efficient oxygen reduction reaction in ceramic microbial fuel cells operating with urine
Iron-streptomycin derived catalyst for efficient oxygen reduction reaction in ceramic microbial fuel cells operating with urine
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DOI：
10.1016/j.jpowsour.2019.03.052
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发表时间：
2019-06-15
影响因子：
9.2
通讯作者：
Ieropoulos, Ioannis
中科院分区：
文献类型：
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作者：
Garcia, Maria Jose Salar;Santoro, Carlo;Ieropoulos, Ioannis
近年来，微生物燃料电池(MFC)技术因其能够同时生产清洁能源和处理不同类型的废物而受到科学界的关注。通常，需要昂贵的催化剂来促进氧还原反应(ORR)，这阻碍了它们的大规模商业化。本工作以铁盐和链霉素为原料合成了一种新型的铁基催化剂(Fe-STR)，并对其进行了化学、形态和电化学研究。通过旋转圆盘电极(RDE)分析初步筛选了碳纳米管(CNT)掺杂前后Fe-STR的反应动力学。然后，将催化剂集成到呼吸空气的阴极中，并放置在连续供应人尿的陶瓷型MFC中。半波电位呈现如下趋势：Festr>；Fe-STR-CNT AC，表明Fe-STR对ORR有较好的动力学作用。在MFC性能方面，结果表明，运行3个月后，含有铁基催化剂的阴极的性能优于交流基阴极。长期的测试报告表明，铁基阴极可以使MFC达到104.5+/-0.0muW cm(-2)的稳定功率输出，比交流基阴极(60.4+/-3.9muW cm(-2))高出74%。据作者所知，这种动力性能是使用人类尿液喂养的陶瓷型MFC记录的最高水平。
In recent years, the microbial fuel cell (MFC) technology has drawn the attention of the scientific community due to its ability to produce clean energy and treat different types of waste at the same time. Often, expensive catalysts are required to facilitate the oxygen reduction reaction (ORR) and this hinders their large-scale commercialisation. In this work, a novel iron-based catalyst (Fe-STR) synthesised from iron salt and streptomycin as a nitrogen-rich organic precursor was chemically, morphologically and electrochemically studied. The kinetics of Fe-STR with and without being doped with carbon nanotubes (CNT) was initially screened through rotating disk electrode (RDE) analysis. Then, the catalysts were integrated into air-breathing cathodes and placed into ceramic-type MFCs continuously fed with human urine. The half-wave potential showed the following trend FeSTR > Fe-STR-CNT AC, indicating better kinetics towards ORR in the case of Fe-STR. In terms of MFC performance, the results showed that cathodes containing Fe-based catalyst outperformed AC-based cathodes after 3 months of operation. The long-term test reported that Fe-STR-based cathodes allow MFCs to reach a stable power output of 104.5 +/- 0.0 mu W cm(-2), 74% higher than AC-based cathodes (60.4 +/- 3.9 mu W cm(-2)). To the best of the Authors' knowledge, this power performance is the highest recorded from ceramic-type MFCs fed with human urine.