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Carbon black as an alternative cathode material for electrical energy recovery and transfer in a microbial battery.

Abstract：

:Rather than the conventional concept of viewing conductive carbon black (CB) to be chemically inert in microbial electrochemical cells (MECs), here we confirmed the redox activity of CB for its feasibility as an electron sink in the microbial battery (MB). Acting as the cathode of a MB, the solid-state CB electrode showed the highest electron capacity equivalent of 18.58 ± 0.46 C/g for the unsintered one and the lowest capacity of 2.29 ± 0.48 C/g for the one sintered under 100% N2 atmosphere. The capacity vibrations of CBs were strongly in coincidence with the abundances of C=O moiety caused by different pretreatments and it implied one plausible mechanism based on CB's surface functionality for its electron capturing. Once subjected to electron saturation, CB could be completely regenerated by different strategies in terms of electrochemical discharging or donating electrons to biologically-catalyzed nitrate reduction. Surface characterization also revealed that CB's regeneration fully depended on the reversible shift of C=O moiety, further confirming the functionality-based mechanism for CB's feasibility as the role of MB's cathode. Moreover, resilience tests demonstrated that CB cathode was robust for the multi-cycles charging-discharging operations. These results imply that CB is a promising alternative material for the solid-state cathode in MBs.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Zhang X,Guo K,Shen D,Feng H,Wang M,Zhou Y,Jia Y,Liang Y,Zhou M

doi

10.1038/s41598-017-07174-z

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

6981

issue

1

issn

2045-2322

pii

10.1038/s41598-017-07174-z

journal_volume

7

pub_type

杂志文章

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