[22a-D901-1~10] 12.6 Nanobiotechnology

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)English Presentation

[22a-D901-9] Surprising enhancement of extracellular electron transfer (EET) from electroactive bacteria to charge collectors by fumarate and further enhancement of EET by functionalized carbon nanotubes (CNTs)

〇(P)Gabor Mehes¹, Arghyamalya Roy², Daniel Simon², Magnus Berggren², Eleni Stavrinidou² (1.Waseda Univ., 2.Linkoping Univ.)

Keywords:

microbial electrochemistry,fumarate,carbon nanotubes

We are witnessing the convergence of functional nanomaterials with applied microbial electrochemistry for applications in energy harvesting, biosensing, electrosynthesis. Recently, we contributed to these efforts by creating a 3D hybrid bioelectrode based on PEDOT:PSS and Shewanella oneidensis MR-1 for enhancing the output of MESs[1], and by the first demonstration of amplification of EET by organic electrochemical transistors [2]. After shortly introducing these two papers, we will discuss two ways EET can be enhanced to yield MESs with electrical performances closer to realistic applications. Especially, we have been investigating the effect of chemically-functionalized CNTs, as well as the biomolecule fumarate, on the magnitude and temporal dynamics of EET. We observed distinctively different effects on EET based on the chemical agent for functionalization of CNTs, and an unexpected role of fumarate in EET dynamics.

Ref.
[1] Zajdel, Baruch, Méhes (equal contributions), et al. Sci. Rep., 2018, 8, 15293, 1–12.
[2] Méhes, Roy, Strakosas (equal contributions), et al. Adv. Science, 2020, 7, 2000641(1–8).