NDLI: Thermodynamics and kinetics of NAD+ adsorption on a glassy carbon electrode

Content Provider	Springer Nature Link
Author	Ali, Irshad Omavic, Sasha
Copyright Year	2013
Abstract	Thermodynamics and kinetics of nicotinamide adenine dinucleotide (NAD+) adsorption on a glassy carbon (GC) electrode surface was investigated at various electrode potentials and NAD+ concentrations using differential capacitance (DC) and attenuated total reflection Fourier transform infrared (ATR-FTIR) techniques. Equilibrium adsorption measurements confirmed that NAD+ spontaneously and strongly adsorbs on the GC electrode surface. The affinity of NAD+ towards adsorption on the GC electrode surface was found to increase with an increase in electrode potential (charge) to more positive values; the corresponding apparent Gibbs free energy of adsorption was −32.80 ± 0.25, −35.61 ± 0.86, and −38.02 ± 0.40 kJ mol−1 on negatively, neutral, and positively charged electrode surfaces, respectively. The kinetics of NAD+ adsorption is also found to be highly dependent on the electrode surface potential (charge), and it increases with an increase in electrode potential (charge) to positive values. The adsorption process was modeled using a two-step kinetic model, in which the adsorption process involves the formation of two forms of NAD+ on the surface: the thermodynamically unstable (NAD+ ads,rev) and stable (NAD+ ads,stable) forms. ATR-FTIR further confirmed that NAD+, indeed, adsorbed on the GC electrode surface.
Starting Page	833
Ending Page	842
Page Count	10
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	18
Issue Number	3
e-ISSN	14330768
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-11-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NAD+ adsorption Thermodynamics and kinetics Glassy carbon electrode Electrode potential Differential capacitance Physical Chemistry Electrochemistry Energy Storage Characterization and Evaluation of Materials Analytical Chemistry Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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