Elimiantion Voltammetry with Potential Shift

D 2016

Elimiantion Voltammetry with Potential Shift

TRNKOVÁ, Libuše

Základní údaje

Originální název

Elimiantion Voltammetry with Potential Shift

Autoři

TRNKOVÁ, Libuše

Vydání

1. vyd. Hague, 67th Annual Meeting of the International Society of Electrochemistry, 1 s. 2016

Další údaje

Jazyk

angličtina

Typ výsledku

Stať ve sborníku

Obor

10403 Physical chemistry

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Forma vydání

elektronická verze "online"

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova česky

eliminační voltametrie; rtuťová elektroda; pevné elektrody;rychlost polarizace; potenciálový posun

Klíčová slova anglicky

elimination voltammetry; mercury electrode; solid electrodes; scan rate; potential shift

Štítky

Změněno: 17. 5. 2018 14:08, Ing. Nicole Zrilić

Anotace

V originále

The theory of elimination voltammetry with linear scan (EVLS) was published and experimentally verified for reversible, quasi-reversible and irreversible electrode systems [1,2]. To date, this method has found application not only in electroanalysis but also in the study of electroactive inorganic and organic substances on mercury, silver, or graphite electrodes [3-5]. The discussed elimination procedure can be considered a mathematical model of the transformation of current-potential curves; the model eliminates some current components while conserving others. The elimination of chosen particular currents is provided by elimination function defining a linear combination of total currents measured at different scan rates. One total current is chosen as a reference current and the corresponding scan rate is called reference scan rate, vref. For an adsorbed electroactive substance, the function that eliminates the charging and kinetic current components and conserves the diffusion current component yields a specific, sensitive, and well-developed peak-counterpeak (p-cp) signal [6-8]. The paper presents the EVLS transformation of irreversible current-potential curves where irreversible currents can be expressed in the general form Iir = vxY{E+αln(v/vref)}, where the function Y is independent of scan rate v. Then, the EVLS function eliminating the diffusion and charging currents will be transformed for irreversible currents as follows: f(I) = 6.8284I1/2(E-ΔE) – 8.2426I(E) + 2.4142I2(E+ΔE) where we have, for the potential shift, ΔE = (RT/αnF) ln2. Because the αn value is a priori unknown, the potential shift value shall be determined experimentally. Within this context, the shift enables us to determine the αn value, which defines the slowest steps of the investigated electrode process. Importantly, in the general sense, the expanded voltammetry procedure provides the determination of the αn term, which is an operation not commonly achievable with standard electrochemical techniques. Moreover, the experimental verification of theoretical results indicates a significant opportunity for the expansion of an electrode potential range (potential window).

Návaznosti

LD15058, projekt VaV

Název: Příprava substrátů pro povrchově zesílenou Ramanovu spektroskopii pomocí elektrochemických, elektroforetických a jiskrový výboj využívajících technik. (Akronym: ELE-SERS)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Příprava substrátů pro povrchově zesílenou Ramanovu spektroskopii pomocí elektrochemických, elektroforetických a jiskrový výboj využívajících technik.

Citovat

TRNKOVÁ, Libuše. Elimiantion Voltammetry with Potential Shift. Online. In 67th Annual Meeting of the International Society of Electrochemistry. 1. vyd. Hague, 2016, 1 s.

@inproceedings{1353491,
   author = {Trnková, Libuše},
   address = {Hague},
   booktitle = {67th Annual Meeting of the International Society of Electrochemistry},
   edition = {1},
   keywords = {elimination voltammetry; mercury electrode; solid electrodes; scan rate; potential shift},
   howpublished = {elektronická verze "online"},
   language = {eng},
   location = {Hague},
   note = {Nepřenášet do RIV - není na WoS ani Scopus, neodpovídá definici druhů výsledků dle M17+},
   title = {Elimiantion Voltammetry with Potential Shift},
   year = {2016}
}

TY  - JOUR
ID  - 1353491
AU  - Trnková, Libuše
PY  - 2016
TI  - Elimiantion Voltammetry with Potential Shift
CY  - Hague
N1  - Nepřenášet do RIV - není na WoS ani Scopus, neodpovídá definici druhů výsledků dle M17+
KW  - elimination voltammetry
KW  - mercury electrode
KW  - solid electrodes
KW  - scan rate
KW  - potential shift
N2  - The theory of elimination voltammetry with linear scan (EVLS) was published and experimentally verified for reversible, quasi-reversible and irreversible electrode systems [1,2]. To date, this method has found application not only in electroanalysis but also in the study of electroactive inorganic and organic substances on mercury, silver, or graphite electrodes [3-5]. The discussed elimination procedure can be considered a mathematical model of the transformation of current-potential curves; the model eliminates some current components while conserving others. The elimination of chosen particular currents is provided by elimination function defining a linear combination of total currents measured at different scan rates. One total current is chosen as a reference current and the corresponding scan rate is called reference scan rate, vref. For an adsorbed electroactive substance, the function that eliminates the charging and kinetic current components and conserves the diffusion current component yields a specific, sensitive, and well-developed peak-counterpeak (p-cp) signal [6-8]. The paper presents the EVLS transformation of irreversible current-potential curves where irreversible currents can be expressed in the general form Iir = vxY{E+αln(v/vref)}, where the function Y is independent of scan rate v. Then, the EVLS function eliminating the diffusion and charging currents will be transformed for irreversible currents as follows: f(I) = 6.8284I1/2(E-ΔE) – 8.2426I(E) + 2.4142I2(E+ΔE) where we have, for the potential shift, ΔE = (RT/αnF) ln2. Because the αn value is a priori unknown, the potential shift value shall be determined experimentally. Within this context, the shift enables us to determine the αn value, which defines the slowest steps of the investigated electrode process. Importantly, in the general sense, the expanded voltammetry procedure provides the determination of the αn term, which is an operation not commonly achievable with standard electrochemical techniques. Moreover, the experimental verification of theoretical results indicates a significant opportunity for the expansion of an electrode potential range (potential window).
ER  -

TRNKOVÁ, Libuše. Elimiantion Voltammetry with Potential Shift. Online. In \textit{67th Annual Meeting of the International Society of Electrochemistry}. 1. vyd. Hague, 2016, 1 s.

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