Building electrode with three-dimensional macroporous interface from biocompatible polypyrrole and conductive graphene nanosheets to achieve highly efficient microbial electrocatalysis
| Autor: | Liming Yang, Hao-Yi Cheng, Ya-Nan Hou, Aijie Wang, Shenglian Luo, Spyros G. Pavlostathis, Genping Yi, Xubiao Luo |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Bioelectric Energy Sources Polymers Biomedical Engineering Biophysics Nanotechnology 02 engineering and technology Biosensing Techniques Conductivity Polypyrrole Electrocatalyst Electrochemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound law Pyrroles Geobacter sulfurreducens Electrodes biology Graphene 010401 analytical chemistry Electric Conductivity General Medicine Electrochemical Techniques 021001 nanoscience & nanotechnology biology.organism_classification 0104 chemical sciences Nanostructures chemistry Transmission electron microscopy Electrode Graphite 0210 nano-technology Geobacter Porosity Biotechnology |
| Zdroj: | Biosensorsbioelectronics. 141 |
| ISSN: | 1873-4235 |
| Popis: | Bioelectrochemical systems (BESs) possess a great potential for simultaneous wastewater treatment and energy recovery. Rational construction of electrode materials could significantly improve the BESs performance. Three-dimensional macroporous electrode interface with high conductivity is highly desirable but challenging. In this work, we report a hierarchically nanostructured reduced graphene oxide nanosheets-polypyrrole (rGO@PPy) electrode via one-step electrodeposition technique. The prepared electrode was comprehensively studied by scanning/transmission electron microscopy, Raman spectroscopy, X-ray diffraction and electrochemical measurements, which showed that the rGO@PPy possessed a three-dimensional macroporous interconnecting scaffold with superior conductivity. The rGO@PPy electrode was utilized in Geobacter sulfurreducens inoculated BESs, and the maximum current density was 4.10 ± 0.02 mA cm−2, which is 8-fold higher than that of a rGO electrode (0.51 ± 0.03 mA cm−2), and is among the best performance reported for two-dimensional electrodes. The improved performance is ascribed to ultrahigh biomass concentration induced by “best match scale” between rGO@PPy and microbes, excellent extracellular electron transfer, as well as enhanced microbial affinity through the adequate exposure of biocompatible PPy layers. This work demonstrated a synergistic effect between rGO and PPy for the BESs performance improvement, and provided a new insight to design and fabricate a high-performance bioelectrode. |
| Databáze: | OpenAIRE |
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