title: Biotic and abiotic characterization of bioanodes formed on oxidized carbon electrodes as a basis to predict their performance.
abstract: Bioelectrochemical systems (BESs) are based on the catalytic activity of biofilm on electrodes, or the so-called bioelectrodes, to produce electricity and other valuable products. In order to increase bioanode performance, diverse electrode materials and modification methods have been implemented; however, the factors directly affecting performance are yet unclear. In this work carbon cloth electrodes were modified by thermal, chemical, and electrochemical oxidation to enhance oxygenated surface groups, to modify the electrode texture, and consequently the electron transfer rate and biofilm adhesion. The oxidized electrodes were physically, chemically, and electrochemically characterized, then bioanodes were formed at +0.1 V vs. Ag/AgCl using domestic wastewater amended with acetate. The bioanode performance was evaluated according to the current and charge generated. The efficacy of the treatments were in the order Thermal>Electrochemical>Untreated>Chemical oxidation. The maximum current observed with untreated electrode was 0.152±0.026 mA (380±92 mA m(-2)), and it was increased by 78% and 28% with thermal and electrochemical oxidized electrodes, respectively. Moreover, the volatile solids correlated significantly with the maximum current obtained, and the electrode texture was revealed as a critical factor for increasing the bioanode performance.
authors.affiliation: Instituto Potosino de Investigación Científica y Tecnológica, A.C. División de Ciencias Ambientales, Camino a la Presa San José No. 2055, Lomas 4a Sección, 78216 San Luis Potosí, San Luis Potosí, México. Electronic address: bibiana.cercado@ipicyt.edu.mx.
authors.forename: Bibiana
authors.initials: B
authors.lastname: Cercado
authors.forename: Luis Felipe
authors.initials: LF
authors.lastname: Cházaro-Ruiz
authors.forename: Vianey
authors.initials: V
authors.lastname: Ruiz
authors.forename: Israel de Jesús
authors.initials: Ide J
authors.lastname: López-Prieto
authors.forename: Germán
authors.initials: G
authors.lastname: Buitrón
authors.forename: Elías
authors.initials: E
authors.lastname: Razo-Flores
mesh_terms: D000085:Acetates / Q000737:chemistry; D001674:Bioelectric Energy Sources / Q000382:microbiology*; D018441:Biofilms / Q000254:growth & development*; D002244:Carbon / Q000737:chemistry*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D010084:Oxidation-Reduction; D012834:Silver / Q000737:chemistry; D018030:Silver Compounds / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry
chemical_list: D000085:Acetates; D002244:Carbon; D006108:Graphite; D012834:Silver; D018030:Silver Compounds; D062065:Wastewater; C037548:silver chloride
keywords: %CE; %CV; ANCOVA; ANOVA; Analysis of covariance; Analysis of variance; BES; Bioanode; Bioelectrochemical system(s); C; CO; CODs; CPE; CV; Capacitance; Carbon based electrodes; Charge transfer resistance; Chemically oxidized electrode; Coefficient of variation; Constant phase element; Coulombic efficiency; Current; Current peak; Cyclic voltammetry; Diffusion element; EAA; EO; Electroactive biofilm; Electrochemically active area; Electrochemically oxidized electrode; Electrode characterization; I; Ip; M; MEC; MFC; Microbial electrolysis cell(s); Microbial fuel cell(s); OCP; Ohmic resistance; Open circuit potential; Oxidation treatments; PEIS; PZC; Point of zero charge; Potential peak separation; Potentiostatic electrochemical impedance spectroscopy; Q; R; R(CT); Resistance; Ro; SSA; Soluble chemical oxygen demand; Specific surface area; TO; Thermal oxidized electrode; UE; Untreated electrode; VS; Volatile solids; W; Warburg's diffusion element; ΔEp