Algal biomass derived biochar anode for efficient extracellular electron uptake from Shewanella oneidensis MR-1

Abstract

Algal biochar anode produced higher biocurrent compared with graphite plate anode.

Algal biochar exhibited stronger electrochemical response to redox mediators.

Algal biochar showed excellent adsorption to redox mediators.

The development of cost-effective and highly efficient anode materials for extracellular electron uptake is important to improve the electricity generation of bioelectrochemical systems. An effective approach to mitigate harmful algal bloom (HAB) is mechanical harvesting of algal biomass, thus subsequent processing for the collected algal biomass is desired. In this study, a low-cost biochar derived from algal biomass via pyrolysis was utilized as an anode material for efficient electron uptake. Electrochemical properties of the algal biochar and graphite plate electrodes were characterized in a bioelectrochemical system (BES). Compared with graphite plate electrode, the algal biochar electrode could effectively utilize both indirect and direct electron transfer pathways for current production, and showed stronger electrochemical response and better adsorption of redox mediators. The maximum current density of algal biochar anode was about 4.1 times higher than graphite plate anode in BES. This work provides an application potential for collected HAB to develop a cost-effective anode material for efficient extracellular electron uptake in BES and to achieve waste resource utilization.

Graphical abstract

Keywords

Algal biochar / Anode material / Electrochemical activity / Extracellular electron transport / Waste resource utilization

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