Silk Protein-Derived carbon fabric as an electrode with high Electro-Catalytic activity for All-Vanadium redox flow batteries

Title
Silk Protein-Derived carbon fabric as an electrode with high Electro-Catalytic activity for All-Vanadium redox flow batteries
Authors
이성호조세연이민의장다원이소라유지선최재원진형준
Keywords
Silk fabric; Carbon fabric; Heteroatom; Electrode; Electro-catalytic activity; Vanadium redox flow batteries
Issue Date
2021-11
Publisher
Applied surface science
Citation
VOL 567, 150810
Abstract
In this study, we fabricated silk protein-derived carbon fabrics (SCFs) as electrodes for vanadium redox flow batteries (VRFBs) using a commercial silk fabric through a facile pyrolysis process, without any post-treatment. After the pyrolysis, the intrinsic fabric morphologies of the SCFs were maintained, resulting in highly macroporous structures. In addition, even after pyrolysis at high temperature above 1,600 ?C, the SCFs contain sufficient heteroatoms such as oxygen and nitrogen on their surface, originated from their protein nature. As a result, SCF electrodes prepared by heating at 1,600 ?C exhibited peak potential separation (ΔEp) values as low as ~ 164.5 and 164.6 mV at a scan rate of 5 mV s ? 1 in both catholyte and anolyte, respectively, demonstrating excellent electro-catalytic activity. Furthermore, single cell-based VRFBs using symmetric SCF-1600//SCF-1600 pairs revealed a considerably high energy efficiency of 86.8%, which is 10.3% higher than that of VRFB using commercial carbon felt electrodes (76.5%). After 100th galvanostatic charge/discharge cycles, the capacity retention of 91% that was achieved, verified the long-term cycling stability. Our study suggest that the suitable heteroatom contents and carbon microstructures of electrode material can enhance the electrochemical performances, resulting in high electro-catalytic activity for vanadium redox flow batteries.
URI
http://pubs.kist.re.kr/handle/201004/73580
ISSN
0169-4332
Appears in Collections:
KIST Publication > Article
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