Spray pyrolysis-assisted synthesis of hollow cobalt nitrogen-doped carbon catalyst for the performance enhancement of membraneless fuel cells

Authors
Ji, JungyeonKyungmin YimAn, HeeyeonYoo, Sung JongChung, YongjinKim, JinsooKwon, Yongchai
Issue Date
2022-02
Publisher
John Wiley & Sons Inc.
Citation
International Journal of Energy Research, v.46, no.2, pp.760 - 773
Abstract
Hollow cobalt nitrogen-doped carbon (H-CoNC) is suggested for use in the membraneless hydrogen peroxide fuel cell (HPFC) and enzymatic biofuel cell (EBC) as anodic catalyst boosting hydrogen peroxide oxidation reaction (HPOR). For fabricating H-CoNCs, a facile spray pyrolysis-assisted process is used, and such produced H-CoNCs show a porous and hollow-shell structure, while they include a large amount of isolated Co atoms and coordinate bonds with Co and nitrogen (Co-N-4). This structure promotes mass transfer to the active site and excellent catalytic activity for HPOR. With these benefits of H-CoNCs, the current density of the bioanode consisting of H-CoNC, carbon nanotube, and glucose oxidase (H-CoNC/CNT/GOx) observed at 0.3 V under 150 mM glucose is 315.5 mu A cm(-2), which is 2.1 times higher than that of a conventionally synthesized catalyst using Co-doped carbon nanoparticles (CoNC-NPs) (CoNC-NPs/CNT/GOx, 146.2 mu A cm(-2)). With this superior catalytic activity for HPOR, maximum power density (MPD) of membraneless EBC using H-CoNC/CNT/GOx is 33.8 +/- 4.52 mu W cm(-2), which is 52% higher than that of CoNP-NPs/CNT/GOx. In addition, a membraneless HPFC using H-CoNC/CNT demonstrates 4.87 times higher MPD (231.3 +/- 11.3 mu W cm(-2)) than that using CoNC-NPs/CNT, proving that H-CoNC improves the performance of fuel cells by its excellent catalytic activity.
Keywords
GLUCOSE-OXIDASE; HYDROGEN-PEROXIDE; BIOFUEL CELLS; ELECTRON-TRANSFER; AXIAL LIGAND; OXIDATION; POLYMER; PLATINUM; CATHODE; ELECTROCHEMISTRY; hydrogen peroxide oxidation reaction; single-atomic catalyst; cobalt-doped carbon; enzymatic biofuel cell; hydrogen peroxide fuel cell
ISSN
0363-907X
URI
https://pubs.kist.re.kr/handle/201004/115782
DOI
10.1002/er.7200
Appears in Collections:
KIST Article > 2022
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