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Performance of Reduced Titanium Oxide and Boron Doped Diamond as anodes in hyperthermophilic bioelectrochemical systems

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#Hydrogen

Publications - Article

Performance of Reduced Titanium Oxide and Boron Doped Diamond as anodes in hyperthermophilic bioelectrochemical systems

Thermotoga neapolitana are hydrogen-producing bacteria at a temperature of 80°C. This study demonstrates that biofilms formed by T. neapolitana can significantly alter the electrical conductivity of electrodes coated with reduced titanium oxide and boron-doped diamond in a bioelectrochemical system.

This study compares the performance of reduced titanium oxide (RTO) against carbon cloth (CC) and commercially boron-doped diamond (BDD) as anodes in hyperthermophilic bioelectrochemical systems operating at 80°C with Thermotoga neapolitana bacteria. Two RTO samples were synthesized by plasma electrolytic oxidation (PEO) of titanium sheets and subsequent electrochemical reduction. The electrochemical performances of CC, BDD, and RTO were tested using cyclic voltammetry in the anodic region (0-1 V, 50 mV/s), under abiotic and biotic conditions.

 

The surface of the colonized materials was observed using SEM microscopy. The results show that bacteria rapidly deposited on all tested materials, significantly influencing their electrochemical conductivity. Integration of voltammetric cycles reveals that the biofilm generates capacitive effects on the anodic surfaces, particularly pronounced in RTO, less in CC, and absent in BDD. The charge densities provided by the capacitive response of RTO and CC are approximately 5.58 and 0.77 mC/cm², respectively.

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Rif.RSE​

22014195

Destination​

EDP Sciences Proceedings EFC21 - European Fuel Cells and Hydrogen Piero Lunghi Conference

Publication Date

10 January 2022

Authors​

L. Malavola, S. Franz, M. Bestetti, (Politecnico di Milano,) N. Esercizio, G. D’Ippolito, (National Research Council (CNR), P. Cristiani (RSE S.p.A.)

Publication Type

Article

Projects

Hydrogen technologies (Hydrogen)

Target​

Press & Media

Related tags

#Hydrogen

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