The fiber-type biofuel cell is attractive as an implantable energy source because the fiber can modify various structures and the wound can be stitched like a suture. In addition, in daily life, the biofuel cell is forced by human motion, and stretchability is a critical requirement for real applications. Therefore, we introduce a new type of highly stretchable, stable, soft fiber biofuel cell with microdiameter dimensions as an energy harvester. The completed biofuel cell operated well in fluids similar to human fluids, such as 20 mM phosphate-buffered 0.14 M NaCl solution (39.5 mW/cm²) and human serum (36.6 μW/cm²). The fiber-type biofuel cell can be reversibly stretched up to 100% in tensile direction while producing sustainable electrical power. In addition, the unique rewrapping structure, which traps the enzyme between multiwalled carbon nanotube sheets, enormously enhanced the stability of the biofuel cell when the biofuel cell was repeatedly stretched (the power density retention increased from 63 to 99%) and operated in human serum (the power density retention increased from 29 to 86%). The fiber can be easily woven into various structures, such as McKibben braid yarn, and scaled up by series and parallel connections.

中文翻译：

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通过包裹多壁碳纳米管片的可拉伸纤维生物燃料电池

纤维型生物燃料电池作为可植入的能源是有吸引力的，因为纤维可以改变各种结构并且伤口可以像缝合线一样缝合。另外，在日常生活中，生物燃料电池受到人体运动的推动，而可拉伸性是实际应用中的关键要求。因此，我们引入了一种新型的高伸缩性，稳定，具有微小直径尺寸的软纤维生物燃料电池作为能量收集器。完整的生物燃料电池在与人的液体相似的液体中运行良好，例如20 mM磷酸盐缓冲的0.14 M NaCl溶液（39.5 mW / cm ²）和人血清（36.6μW/ cm ^2））。纤维型生物燃料电池可在拉伸方向上可逆地拉伸至100％，同时产生可持续的电力。此外，独特的包裹结构将酶捕获在多壁碳纳米管片之间，在生物燃料电池被反复拉伸（功率密度保留率从63％提高到99％）并在人血清中运行时，极大地增强了生物燃料电池的稳定性。 （功率密度保持率从29％增加到86％）。可以轻松地将纤维编织成各种结构，例如McKibben编织纱，并通过串联和并联连接按比例放大。