Resolving electron transfer kinetics in porous electrodes via diffusion-less cyclic voltammetry

2021 ◽  
Author(s):  
Shida Yang ◽  
Yang Li ◽  
Qing Chen
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Reaction Rates ◽  
Porous Electrodes ◽  
Three Dimensions ◽  
Electrochemical Cells ◽  
Electron Transfer Kinetics ◽  
Electrolyte Interface

Porous electrodes are cornerstones in advanced electrochemical cells. They extend the electrode/electrolyte interface to three dimensions to boost reaction rates with high specific areas. The rate, however, depends on not...

scholarly journals Carbon Nanotube Yarn Microelectrodes Promote High Temporal Measurements of Serotonin Using Fast Scan Cyclic Voltammetry

Sensors ◽  
2020 ◽  
Vol 20 (4) ◽  
pp. 1173 ◽  
Author(s):  
Alexander Mendoza ◽  
Thomas Asrat ◽  
Favian Liu ◽  
Pauline Wonnenberg ◽  
Alexander G. Zestos
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Carbon Nanotube ◽  
Electrode Materials ◽  
Cyclic Voltammograms ◽  
Electron Transfer Kinetics ◽  
Fast Scan Cyclic Voltammetry ◽  
Peak Separation ◽  
Aspect Ratios ◽  
Carbon Fiber Microelectrodes

Carbon fiber-microelectrodes (CFMEs) have been the standard for neurotransmitter detection for over forty years. However, in recent years, there have been many advances of utilizing alternative nanomaterials for neurotransmitter detection with fast scan cyclic voltammetry (FSCV). Recently, carbon nanotube (CNT) yarns have been developed as the working electrode materials for neurotransmitter sensing capabilities with fast scan cyclic voltammetry. Carbon nanotubes are ideal for neurotransmitter detection because they have higher aspect ratios enabling monoamine adsorption and lower limits of detection, faster electron transfer kinetics, and a resistance to surface fouling. Several methods to modify CFMEs with CNTs have resulted in increases in sensitivity, but have also increased noise and led to irreproducible results. In this study, we utilize commercially available CNT-yarns to make microelectrodes as enhanced neurotransmitter sensors for neurotransmitters such as serotonin. CNT-yarn microelectrodes have significantly higher sensitivities (peak oxidative currents of the cyclic voltammograms) than CFMEs and faster electron transfer kinetics as measured by peak separation (ΔEP) values. Moreover, both serotonin and dopamine are adsorption controlled to the surface of the electrode as measured by scan rate and concentration experiments. CNT yarn microelectrodes also resisted surface fouling of serotonin onto the surface of the electrode over thirty minutes and had a wave application frequency independent response to sensitivity at the surface of the electrode.

Electron Transfer at Boron-Doped Diamond Electrodes. Comparison with Pt, Au and RuO2

2003 ◽  
Vol 68 (9) ◽  
pp. 1621-1635 ◽  
Author(s):  
Francesco Friso ◽  
Sergio Trasatti
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Exchange Reaction ◽  
Rate Constants ◽  
Electrolyte Solutions ◽  
Reaction Rates ◽  
Diamond Electrodes ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Order Of Magnitude

Electron exchange reaction rates were compared for boron-doped diamond (BDD), Pt, Au and RuO2 using [Ru(NH3)6]3+/2+ as a redox couple. The study was carried out by cyclic voltammetry; calculations were performed by Nicholson's procedure. The results show that the rate constants on BDD, Pt and Au are qualitatively similar, one order of magnitude higher than on RuO2. The outcome is explained in terms of the specific structure of the interface between oxides and electrolyte solutions.

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