Intelligent, automatic compensation of solution resistance

He, Peixin; Faulkner, Larry R.

doi:10.1021/ac00294a004

Cited by 105 publications

(78 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The uncompensated solution resistance was determined using a method developed by He and Faulkner. 17 . This parameter was specifically considered in the Tafel plot measurements, where the data is presented in iR compensated form.…”

Section: Methodsmentioning

confidence: 99%

Hydrous Nickel Oxide: Redox Switching and the Oxygen Evolution Reaction in Aqueous Alkaline Solution

Lyons

Doyle

Godwin

et al. 2012

J. Electrochem. Soc.

119

137

View full text Add to dashboard Cite

The redox switching reaction and the oxygen evolution reaction at multi-cycled nickel oxy-hydroxide films in aqueous alkaline solution are discussed. The hydrous oxide is considered as a porous assembly of interlinked octahedrally coordinated anionic metal oxyhydroxide surfaquo complexes which form an open network structure. The latter contains considerable quantities of water molecules which facilitate hydroxide ion discharge at the metal site during active oxygen evolution. The dynamics of redox switching has been quantified in terms of a diffusive frequency using the Laviron-Aoki diffusion model. Steady state Tafel plot analysis has been used to elucidate the kinetics and mechanism of oxygen evolution with slopes of ca. 60 mVdec −1 and ca. 120 mVdec −1 at low and high overpotentials respectively, whereas the reaction order with respect to hydroxide ion activity remains invariant at ca. 1.0 as the potential is increased. These observations are rationalized in terms of a kinetic scheme involving surfaquo groups.

show abstract

Section: Methodsmentioning

confidence: 99%

Hydrous Nickel Oxide: Redox Switching and the Oxygen Evolution Reaction in Aqueous Alkaline Solution

Lyons

Doyle

Godwin

et al. 2012

J. Electrochem. Soc.

119

137

View full text Add to dashboard Cite

show abstract

“…The usual feedback loop for the RE contains a voltage follower. 16 The latter matches the high impedance of the RE to the impedance (typically ¾2 K ) of a summing network, and prevents any currents from flowing through the RE. Detailed discussion of these potentiostats can be found in the literature.…”

Section: Considerations Of Instrumental Factorsmentioning

confidence: 97%

“…In an earlier report, He and Faulkner noted that the frequency response of the cell to a PS approaches the ideal response for infinite bandwidth, with an exponential decay of the frequency amplitude envelope. 16 Thus, in the context of PS experiments it is necessary to consider a frequency (ω)-dependent complex impedance Z W for the WE, as is usually done in electrochemical impedance spectroscopy(EIS). 14,18 When the applied voltage is stepped from E ei to E ef , the available input current to the cell, i in , has the form…”

Section: Considerations Of Instrumental Factorsmentioning

confidence: 99%

“…If the magnitude of the voltage step is relatively small (Ä50 mV), a reasonably fast potentiostat can meet this condition in a short time (within a few microseconds). 12,16 On the other hand, for larger steps (100-500 mV) a finite interval may be necessary to meet the voltage requirement for the step. The length of the interval necessary to establish E ef would depend on R , R CE , and Z W .…”

Section: Considerations Of Instrumental Factorsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of potentiostatic current transients at metal/liquid interfaces: resolving the effects of a finite step interval

Garland

Pettit

Walters

et al. 2001

Surface & Interface Analysis

View full text Add to dashboard Cite

Potentiostatic current transients are used routinely for electrochemical analysis of metal/liquid interfaces. These measurements can be affected by both the electrochemical cell and the potentiostat used for such experiments. We demonstrate this in the present report with double-layer charging experiments using a gold electrode in aqueous electrolytes of NaF and NaNO 3 . By employing a high-resolution potentiostat, we show that the apparently instantaneous voltage step actually has a finite temporal width. The double-layer charging current develops an additional feature due to this behavior of the voltage step. We present a theoretical framework to resolve these instrumental effects from the actual electrical response of the double layer. The results are compared with a set of independent measurements of the same quantities using impedance spectroscopy.

show abstract

“…Among the latest instrumental methods is intelligent, automatic compensation of solution resistance by means of a cybernetic potentiostat (ref. 23). In this way cyclic voltammetry of ferrocene in methylene chloride (pernittivity = 9) with 0.1 M tetrabutylamnoniun tetrafluoroborate as supporting electrolyte could be much improved, with the anodic-to-cathodic peak separation decreasing from 224 mV with no compensation to 59 mV (as expected for a reversible one-electron process) with full compensation.…”

Section: Microelectrodesmentioning

confidence: 89%

Current trends in electrochemical studies of nonaqueous solutions

Coetzee¹

1986

Pure and Applied Chemistry

View full text Add to dashboard Cite

-Current trends in electrochemical studies of nonaqueous solutions are discussed with the emphasis on experimental approaches judged to be particularly promising for the future development of both fundamental and applied aspects of the field of solution chemistry. Topics include recent developments in the application of potentiometric sensors to nonaqueous solutions, the potentialities of such new materials as reactively sputtered iridium oxide as hydrogen ion sensors, and the demonstrated or potential advantages of microelectrodes with diameters less than approximately 20 urn in cyclic voltamnetry and a variety of other electrochenical techniques applicable to nonaqueous solutions. The extension of electrochemical measurements to nonpolar media is emphasized. Recent developments in certain other areas such as applications of solid electrolytes and chemically modified electrodes, and studies of interfaces between immiscible solvents, are briefly discussed.

show abstract

Intelligent, automatic compensation of solution resistance

Cited by 105 publications

References 32 publications

Hydrous Nickel Oxide: Redox Switching and the Oxygen Evolution Reaction in Aqueous Alkaline Solution

Hydrous Nickel Oxide: Redox Switching and the Oxygen Evolution Reaction in Aqueous Alkaline Solution

Analysis of potentiostatic current transients at metal/liquid interfaces: resolving the effects of a finite step interval

Current trends in electrochemical studies of nonaqueous solutions

Contact Info

Product

Resources

About