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The Use of Accumulated Charge Density of a Bioanode to Estimate Maximum Current in a Bioelectrochemical System
Author(s) -
Wu Baoguo,
Yu Hui,
Lin Chong,
Feng Chunhua,
Wei Chaohai
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500139
Subject(s) - biofilm , biomass (ecology) , carbon fibers , substrate (aquarium) , graphite , microbial fuel cell , current density , current (fluid) , chemistry , charge (physics) , analytical chemistry (journal) , electrode , materials science , thermodynamics , environmental chemistry , bacteria , physics , ecology , organic chemistry , biology , composite material , genetics , quantum mechanics , composite number , anode
The maximum current density ( j max ) is of importance to the modeling of current produced in a bioelectrochemical system (BES). This study explores an alternative to biomass and biofilm thickness, the accumulated charge density ( τ ) of electroactive bacteria on the bioanode, to estimate the j max value. The τ values of five carbon‐based bioanodes are chronoamperometrically determined in a substrate‐depleted solution. The graphite felt bioanode acclimated for 1, 2, 4, and 6 batches exhibits τ values of 6.14, 11.80, 22.23, and 30.24 C m −2 , respectively, and j max values of 5.31, 6.69, 14.01, and 19.62 A m −2 , respectively. A linear correlation between τ and j max is achieved and can be expressed as j max =0.64 τ . The τ and j max values of four other carbon‐based bioanodes also follow a linear relationship, with coefficients of approximately 0.64. These results imply that τ is a key parameter for estimating j max in the BES without the need to determine biomass and biofilm thickness.