MESSAI.iO
Microbial electrochemical systemRepresentative model
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Representative microbial electrochemical system — matched on the paper’s system type only, not its reactor or geometry.

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What they did

System
MES

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Abstract

Bioelectrochemical systems (BESs) can fulfill the demand for renewable energy and wastewater treatment but still face significant challenges to improve their overall performance. Core efforts have been made to enhance the bioelectrode performance, yet, previous approaches are fragmented and have limited applicability, unable to flexibly adjust physicochemical and structural properties of electrodes for specific requirements in various applications. Here, we propose a facile electrode design strategy that integrates three-dimensional printing technology and functionalized modular electrode materials. A customized graphene-based electrode with hierarchical pores and functionalized components (i.e., ferric ions and magnetite nanoparticles) was fabricated. Owing to efficient mass and electron transfer, a high volumetric current density of 10,608 ± 1,036 A/m 3 was achieved, the highest volumetric current density with pure Geobacter sulfurreducens to date. This strategy can be readily applied to existing BESs (e.g., microbial fuel cells and microbial electrosynthesis) and provide a feasibility for practical application.

Keywords

Microbial fuel cellGeobacter sulfurreducensNanotechnologyModular designElectrodeGraphene

Identifiers

DOI
10.1016/j.isci.2021.102163
PubMed
33665579
Journal
iScience
Year
2021