Recent progress of graphene based nanomaterials in bioelectrochemical systems

Abstract

The application of graphene (Gr) to microbial fuel cells (MFCs) and microbial electrolysis cell (MECs) is considered a very promising approach in terms of enhancing their performance. The superior Gr properties of high electrical and thermal conductivities, along with: superior specific surface area, high electron mobility, and mechanical strength, are the key features that endorse this. Factors impeding the advancement of a microbial fuel cell into commercialization involve primarily the cost of their components, and their production on a small scale. Gr with such outstanding characteristics can help mitigate these challenges, when used as electrode material. The application of Gr as an anode material improves the efficiency of electron transfer and bacterial attachment. When used as a cathode material, it supports the oxygen reduction reaction. This investigation, presents a thorough analysis of the feasibility of Gr as an electrode material in both MFC and MEC applications - based on experimental results from the investigation. Current technological advancements in the implementation of Gr in MFC and MEC are also highlighted in this review. To summarise, the investigation exposes critical issues impeding the advancement of microbial fuel cells, and proposes possible solutions to mitigate these challenges.

Key findings

• ▸Graphene-based electrodes exhibit improved electrochemical activity and stability in bioelectrochemical systems.
• ▸Graphene-based nanomaterials can enhance the electron transfer rate and biofilm formation on electrodes.
• ▸Graphene-based materials have shown potential in improving the efficiency and lifespan of bioelectrochemical systems.

Keywords

Identifiers

DOI

10.1016/j.scitotenv.2020.141225

PubMed

32814206

Journal

Science of The Total Environment

Year

2020