Anode modification with peptide nanotubes encapsulating riboflavin enhanced power generation in microbial fuel cells. (21st January 2016)

• Record Type: Journal Article
• Authors: Xu, Hengduo; Quan, Xiangchun
• Is Part Of: International journal of hydrogen energy. Volume 41:Number 3(2016)
• Page Start: 1966
• Page End: 1973
• Publication Date: 2016-01-21
• Subjects: Peptide nanotubes -- Riboflavin -- Electron transfer -- Microbial fuel cell; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2015.11.124
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: A novel anode modification method was established based on immobilizing a redox mediator riboflavin (RF) onto carbon cloth using bio-inspired and self-assembled peptide nanotubes (PNTs). The cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in Fe(CN)6 3−/4− solution showed that the RF/PNT electrode demonstrated a higher electrocatalytic activity and faradic charge capacity than the untreated electrode. The chronamperometry analysis showed that RF/PNT electrode in the presence of Shewanella oneidensis MR-1 generated a current density of 28.9 μA cm −2, increased by 263.3% compared to the bare electrode. The MFC operated with the RF/PNT anode generated a maximum power density of 767 mW m −2, which was 2.9 times larger than control. Besides, RF/PNT modification significantly reduced anode total internal resistance of MFCs. The self-organized PNTs could increase specific surface and electrical conductivity of anodes and provide a good carrier for redox mediator immobilization, which may contribute to the improved performance of MFCs. Highlights: Anode electrode was modified using peptide nanotube containing riboflavin (RF/PNT). RF/PNT modification improved electrochemical properties of anode electrode. PNT as the carrier retained RF on electrode more effectively and persistently. Anode modification with RF/PNT increased power density in MFCs by 2.9 folds.