3D Printed lattice-structured metal electrodes for enhanced current production in bioelectrochemical systems
3D Printed lattice-structured metal electrodes for enhanced current production in bioelectrochemical systems
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DOI：
10.1080/09593330.2022.2056083
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发表时间：
2022-03
影响因子：
2.8
通讯作者：
T. Yamashita;Y. Yamashita;M. Takano;Naoko Sato;S. Nakano;Hiroshi Yokoyama
中科院分区：
文献类型：
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作者：
T. Yamashita;Y. Yamashita;M. Takano;Naoko Sato;S. Nakano;Hiroshi Yokoyama
摘要生物电化学系统是一种利用生物产生的电流进行能量回收和生物修复的新兴技术。高性能三维（3D）电极的发展已经引起了人们的注意，以促进在BES电流生产。碳基电极通常用于BES中，但由于金属电极与微生物的生物相容性低，因此通常不采用金属电极。在这项研究中，3D不锈钢电极，由八面体晶格组成，使用3D打印技术制造。为了提高电极的生物相容性，在电极表面进行热处理以形成氧化铁层。决定电流产生的另一个关键参数是晶格电极的节距长度，因为它影响表面积和衬底扩散。通过测试间距范围从1.5 mm到6.0 mm的网格电极来优化间距长度。用3.0 mm间距电极获得的最高电流比用普通3D碳毡电极获得的电流高50%。这些结果证明了3D晶格结构金属电极在BESs中的有用性。图形摘要
ABSTRACT Bioelectrochemical systems (BESs) are emerging techniques that use biological production of current for versatile activities, including energy recovery and bioremediation. The development of high-performance three-dimensional (3D) electrodes has attracted attention for facilitating current production in BESs. Carbon-based electrodes have been commonly used in BESs, but metal electrodes are not generally employed because of their low biocompatibility with microbes. In this study, 3D stainless-steel electrodes, composed of octahedral lattice, were fabricated using the 3D printing technique. Heat treatment was conducted to form an iron-oxide layer on the electrode surface for increasing biocompatibility. Another crucial parameter that determines current production is the pitch length of a lattice electrode as it affects the surface area and substrate diffusion. The pitch length was optimized by testing the lattice electrodes with pitches ranging from 1.5 mm to 6.0 mm. The highest current, obtained with the 3.0 mm-pitch electrode, was 50% higher than that obtained with common 3D carbon-felt electrodes. These results demonstrate the usefulness of 3D lattice-structured metal electrodes in BESs. GRAPHICAL ABSTRACT