Journal
RSC ADVANCES
Volume 5, Issue 72, Pages 58921-58927Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra09170e
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Funding
- Fundamental Research Funds for the Central Universities [XDJK2015B018]
- National Natural Science Foundation of China [31200102]
- Institute for Clean Energy & Advanced Materials, Southwest University, Chongqing, P.R. China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies
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Graphene aerogel prepared from a solution is a good candidate for a microbial fuel cell (MFC) anode as it possesses a three dimensional porous structure for high biocatalyst loading. However, the surface modification and pore size adjustment are always required during the synthetic process. In this study, a highly biocompatible porous graphene aerogel is developed using a one-pot synthesis with L-cysteine as the reductant. The addition of L-cysteine not only reduces the graphene oxide at around 80 degrees C under an inert atmosphere but also tailors the pore size and structure of the aerogel. With the optimized ratio of L-cysteine in the precursor, the obtained graphene aerogel GIII exhibits a highly hydrophilic surface and appropriate pore structure for bacteria moving in and adhesion. Increasing the loading of bacterial cells on the GIII anode enables it to achieve a maximum power density of 679.7 mW m(-2), which is around a 1.6 fold higher than the graphene aerogel prepared using a hydrothermal method. This study provides a new way to prepare three-dimensional porous biocompatible anode materials for improving MFC performance.
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