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Indexed by:期刊论文

Date of Publication:2021-02-01

Journal:NANOSCALE

Volume:11

Issue:10

Page Number:4428-4437

ISSN No.:2040-3364

Key Words:Carbon; Electron spin resonance spectroscopy; Energy conversion; Energy gap; Fuel cells; Hydrogen production; Ionization of gases; Microbial fuel cells; Organic pollutants; Paramagnetic resonance; Photocatalytic activity; Spectroscopic analysis, Bioelectrocatalytic activity; Electricity production; Electrocatalytic performance; Electrochemical characterizations; Electron paramagnetic resonances (EPR); Fluorescence properties; Solid-solid interfaces; Spectroscopic measurements, Power quality

Abstract:The emergence of microbial fuel cell (MFC) technology that can effectively recycle renewable energy from organic pollutants has been regarded as a promising and environmentally friendly route that could be widely used in numerous fields. Here, a novel sustainable self-energy conversion system was successfully constructed to renewably synthesize carbon dots (CDs) via in situ coupling with a MFC system. Interestingly, the generation of CDs was found to largely enhance the electricity production performance of the MFC. Low-temperature electron paramagnetic resonance (EPR) spectroscopic measurements and electrochemical characterization analysis results confirmed that the as-prepared CDs exhibited wide-conversion fluorescence properties and exposed carbon-rich active oxygen sites, and demonstrated a suitable band gap as well as excellent electrocatalytic performance. As a result, the prepared CDs possess high photo-bioelectrocatalytic activity for efficient H-2 production, reaching 9.58 mol h(-1). Remarkably, CD-derived photocatalytic ink presented excellent contaminant elimination activity at the solid-solid interface. Thus, this work will provide a new platform for catalyst construction via a bio-assisted method towards the next generation of nano-photocatalytic inks for indoor contaminant removal.