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Fabrications of metal organic frameworks derived hierarchical porous carbon on carbon nanotubes as efficient bioanode catalysts of NAD+-dependent alcohol dehydrogenase.
- Source :
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Electrochimica Acta . Apr2020, Vol. 340, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Herein, we developed an efficient anode catalyst for alcohol biofuel cell by integrating multi-walled carbon nanotubes (MWCNTs) into an isoreticular metal organic framework derived porous carbon. The derived porous carbon (PC) intercalated by MWCNTs (PC/MWCNTs) serviced as the anode component in catalyzing the electrooxidation of reduced β-Nicotinamide adenine dinucleotide (NADH), enabling catalysis to ethanol electrooxidation by alcohol dehydrogenase with NAD+ as both free coenzyme and electron transfer mediators (onset potential, 0.14 V vs. SCE, pH 8.0). Hierarchy of PC/MWCNTs with micro-, meso-, and macropores provides improved immobilization of electroactive enzymes, aids the facile transportations of electrolyte and increases the conductivity and specific surface areas of anode and results in a much higher catalytic current density for NADH (1.17 mA cm−2 for 10 mM NADH, pH 9.0) and alcohol bioanode (maximum steady-state current density, 0.25 ± 0.03 mA cm−2, pH 8.0) than its singular component analogues (PC and MWCNTs). The high Michaelis-Menten constant (166 ± 16.8 mM) favorites the detection of ethanol at high concentrations. The linear range of ethanol is 10–300 mM, with the sensitivity and detection limit as 24 nA mM−1 and 3 mM. The study applies porous carbon nanomaterials as both electrocatalysts for coenzyme and scaffolds for enzymes, benefiting to feasible constructions of bioelectrodes with notable current densities. Image 1 • Novel hierarchical porous carbon hybrids were designed by pyrolyzing metal organic frameworks in situ formed on CNTs. • The hybrids play role in both electrocatalysts for NADH oxidation and optimal scaffolds for alcohol dehydrogenase. • Maximum steady-state catalytic current density with 0.25 ± 0.03 mA·cm–2 was obtained for composed alcohol bioanode. • The research is important to fabricate efficient enzymatic biofuel cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 340
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 142375438
- Full Text :
- https://doi.org/10.1016/j.electacta.2020.135958