Silver nanoparticles boost charge-extraction efficiency in Shewanella microbial fuel cells

Author:

Cao Bocheng12ORCID,Zhao Zipeng2ORCID,Peng Lele1ORCID,Shiu Hui-Ying2,Ding Mengning2ORCID,Song Frank1ORCID,Guan Xun1,Lee Calvin K.3ORCID,Huang Jin2,Zhu Dan1,Fu Xiaoyang1,Wong Gerard C. L.3,Liu Chong1ORCID,Nealson Kenneth4ORCID,Weiss Paul S.1235ORCID,Duan Xiangfeng15ORCID,Huang Yu25ORCID

Affiliation:

1. Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.

2. Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.

3. Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.

4. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA.

5. California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Abstract

Silver in the linings The bacterium Shewanella oneidensis is well known to use extracellular electron sinks, metal oxides and ions in nature or electrodes when cultured in a fuel cell, to power the catabolism of organic material. However, the power density of microbial fuel cells has been limited by various factors that are mostly related to connecting the microbes to the anode. Cao et al . found that a reduced graphene oxide–silver nanoparticle anode circumvents some of these issues, providing a substantial increase in current and power density (see the Perspective by Gaffney and Minteer). Electron microscopy revealed silver nanoparticles embedded or attached to the outer cell membrane, possibly facilitating electron transfer from internal electron carriers to the anode. —MAF

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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