A Self-Powered Herbicide Sensing System Based on an Enzyme Biofuel Cell Integrated with Algal Cells
Noya LOEW, Isao SHITANDA, Masaji Tamura, Yoshinao Hoshi +2
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Abstract
A screen-printed self-powered biosensor was developed to evaluate water toxicity. The biosensor consists of four photosynthetic microbial fuel cells connected in series and an LED indicator light. The bioanode is a screen-printed porous carbon electrode with an immobilized mediator and glucose oxidase, while the biocathode is a screen-printed porous carbon electrode with immobilized bilirubin oxidase and a screen-printed algal layer consisting of microalga Chlorella vulgaris embedded in alginate gel. Both the biocathode and fuel cell are light-responsive and atrazine-sensitive. The biocathode response is concentration-dependent up to 12 µM (M = mol dm−3) atrazine. The maximal power output of the fuel cell is 23.6 µW cm⁻² under light irradiation. With a response time of 6 min, the self-powered biosensor is suitable as a rapid-response water toxicity monitoring system.
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- Journal
- Electrochemistry
- Year
- 2026