Details

Autor(en) / Beteiligte

• Dong, Li
• Su, Lin
• Fu, De Gang
• Yin, Tao

Titel

Chemical Etching of TiO2 Nanorods Greatly Improves Current Generation of S. loihica PV-4 on a Carbon Paper Electrode

Ist Teil von

• Applied mechanics and materials, 2018-01, Vol.875, p.14-18

Ort / Verlag

Zurich: Trans Tech Publications Ltd

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Anode surface plays important role for extracellular electron transfer (EET) of exoelectrogenic microbes in microbial fuel cell (MFC). In this report, the electrochemical performance of a TiO2 nanorod array modified carbon paper electrode (TiO2 NRs/CP) is greatly improved by controlled chemical etching process. The etching process keeps the array morphology but yields obvious hollows on tops of TiO2 nanorods. The etched electrode (TiO2 NRs-HOT/CP) exhibits better hydrophilicity than carbon paper (CP) and TiO2 NRs/CP electrode as seen from smaller contact angle (CA) and more attached microbes S.loihica PV-4. Meanwhile, the hollows allow higher local concentration of microbial self-secreted flavins that can act as electron mediators for interfacial electron transfer of PV-4 through in-direct pathway. Accordingly, PV-4 produces larger current density at TiO2 NRs-HOT/CP electrode with maximum current density of 0.038 mA cm –2, which was much higher than that at CP electrode, and almost five times higher than that at un-etched TiO2 NRs/CP electrode.