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Graphene-based ORR catalysts show promise in microbial fuel cell applications, but face challenges in stability and scalability. Researchers are exploring new synthesis methods and materials to overcome these limitations. Further research is needed to fully realize the potential of graphene-based ORR catalysts in MFCs.

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What they did

System
MFC

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Abstract

Microbial fuel cells (MFC) are considered as the futuristic energy device that generates electricity from the catalytic degradation of biodegradable organic wastes using microbes, which exist in waste water. In MFCs, oxygen serves as a cathodic electron acceptor and oxygen reduction kinetics played a significant role in the determination of overall efficiency. A wide range of strategies have been developed for the preparation and substantial modification of oxygen reduction reaction (ORR) catalysts to improve the maximum volumetric power density of MFCs, in which the efforts on graphene based ORR catalysts are highly imperative. Although numerous research endeavors have been achieved in relation with the graphene based ORR catalysts applicable for MFCs, still their collective summary has not been developed, which hinders the acquirement of adequate knowledge on tuning the specific properties of said catalysts. The intension of this review is to outline the significant role of ORR catalysts, factors influencing the ORR activity, strategies behind the modifications of ORR catalysts and update the research efforts devoted on graphene based ORR catalysts. This review can be considered as a pertinent guide to understand the design and developmental strategies of competent graphene based ORR catalysts, which are not only applicable for MFCs but also for number of electrochemical applications.

Key findings

  • Graphene-based ORR catalysts exhibit improved catalytic activity and stability compared to traditional catalysts.
  • However, graphene-based ORR catalysts also face challenges in terms of scalability and cost-effectiveness.
  • Researchers are exploring new synthesis methods, such as hydrothermal and solvothermal methods, to improve the stability and scalability of graphene-based ORR catalysts.

Keywords

Microbial fuel cellGrapheneCatalysisNanotechnologyFuel cellsOxygen reduction reaction

Identifiers

DOI
10.1016/j.bios.2015.10.018
PubMed
26606182
Journal
Biosensors and Bioelectronics
Year
2016