E3S Web Conf.
Volume 334, 2022EFC21 - European Fuel Cells and Hydrogen Piero Lunghi Conference
|Number of page(s)||5|
|Section||Microbial & Enzymatic Biolectrochemical Systems|
|Published online||10 January 2022|
Performance of Reduced Titanium Oxide and Boron Doped Diamond as anodes in hyperthermophilic bioelectrochemical systems
1 Politecnico di Milano, Department of Chemistry Materials and Chemical Engineering, 20131 Milano, Italy
2 Institute of Biomolecular Chemistry (ICB), National Research Council (CNR), Pozzuoli, 80078, Na, Italy
3 Ricerca sul Sistema Energetico - RSE S.p.A., 20134 Milano, Italy
* Corresponding author: Silvia.Franz@polimi.it
This work investigates Reduced Titanium Oxide (RTO) in comparison with Carbon Cloth (CC) and commercial Boron Doped Diamond (BDD) as anodes in hyperthermophilic bioelectrochemical systems operating at 80°C by Thermotoga neapolitana. Two samples of RTO were synthesized by plasma electrolytic oxidation (PEO) of titanium plates and subsequent electrochemical reduction. Electrochemical performance of CC, BDD, and RTO are tested by performing cyclic voltammetry in the anodic region (0-1V, 50 mV/s), in abiotic and biotic conditions. The surface of colonized materials is observed by SEM microscopy. Results show that bacteria fast settle on all tested material, significantly affecting their electrochemical conductivity. The integration of voltammetric cycles reveals that biofilm generates capacitive effects on the anodic surfaces, particularly evident in RTO, less in CC and absent in BDD. Charge densities provided by capacitive response of RTO and CC are of the order of 5.58 and 0.77 mC/cm2, respectively.
© The Authors, published by EDP Sciences, 2022
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