Oxygen reduction reaction (ORR) electrocatalysts in constructed wetland-microbial fuel cells: Effect of different carbon-based catalyst biocathode during bioelectricity production
作者： Edson Baltazar Estrada-Arriaga , Cecilia Cuevas-Arteaga , Susana Silva-Martínez , Oscar Guadarrama-Pérez , Victor Hugo Guadarrama-Pérez
DOI: 10.1016/J.ELECTACTA.2021.137745
关键词: Exchange current density 、 Platinum 、 Titanium dioxide 、 Microbial fuel cell 、 Graphene 、 Carbon 、 Chemical engineering 、 Chemistry 、 Catalysis 、 Tafel equation
摘要: Abstract The oxygen reduction reaction (ORR) catalytic activities that occur in constructed wetland-microbial fuel cells (CW-MFCs) during bioelectricity production through exudates released from macrophyte rhizosphere using different alternative carbon-based catalysts combined with biocathode were studied this work. A layer of graphene/titanium dioxide (G/TiO2), graphene/nitrogen (G/N), and carbon/platinum (C/Pt) was spray-coated on the carbon cathode as electrocatalysts for CW-MFC1, CW-MFC2, CW-MFC3, respectively. Then, development biofilm took place operation CW-MFCs generating a biohybrid catalyst (carbon-based biocathodes). electrokinetic parameters showed ORR without occurred direct mechanism, which involves transfer four-electrons towards formation water. Tafel slopes 110–184 mV/dec, charge coefficients (α) ≤ 0.5, exchange current density (io) 2.0–4.9 × 10−2 mA/cm2 obtained. These demonstrated increased electrocatalytic ORR. increase active sites biocathodes led to an production. highest bioelectrochemical performance obtained G/TiO2, C/Pt maximum voltages 490 454 mV power densities 99.2 82.4 mW/m2, more than 100% compared layer. Biolectricity directly related generation sugars rhizosphere.
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