Light/electricity conversion by a self-organized photosynthetic biofilm in a single-chamber reactor |
| |
Authors: | Koichi Nishio Kazuhito Hashimoto Kazuya Watanabe |
| |
Institution: | (1) Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;(2) Hashimoto Light Energy Conversion Project, ERATO/JST, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;(3) Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Tokyo 153-8904, Japan; |
| |
Abstract: | Biological energy-conversion systems are attractive in terms of their self-sustaining and self-organizing nature and are expected
to be applied to low-cost and environment-friendly processes. Here we show a biofilm-based light/electricity-conversion system
that was self-organized from a natural microbial community. A bioreactor equipped with an air cathode and graphite-felt anode
was inoculated with a green hot-spring microbial mat. When the reactor was irradiated with light, electric current was generated
between the anode and cathode in accordance with the formation of green biofilm on the anode. Fluorescence microscopy of the
green biofilm revealed the presence of chlorophyll-containing microbes of ∼10 μm in size, and these cells were abundant close
to the surface of the biofilm. The biofilm community was also analyzed by sequencing of polymerase chain reaction-amplified
small-subunit rRNA gene fragments, showing that sequence types affiliated with Chlorophyta, Betaproteobacteria, and Bacteroidetes were abundantly detected. These results suggest that green algae and heterotrophic bacteria cooperatively converted light
energy into electricity. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|