Spectroelectrochemistry for Electroreduction of p-Benzoquinone in Unbuffered Aqueous Solution

Tang, Yanhui; Wu, Yue; Wang, Zhenghao

doi:10.1149/1.1353575

Cited by 35 publications

(32 citation statements)

References 13 publications

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“…Thus, BQ was reported to reduce to BQ À C via n = 1 in solutions not buffered with no potential shifts observed due to the pH change [23,24]. This was, however, disputed in a few studies [25,26] and we now examine it with our MTAV experiments.…”

Section: Benzoquinone Reductionmentioning

confidence: 82%

Mass‐Transfer Admittance Voltammetry from Electrochemical Impedance Spectroscopy and Its Applications

Chang¹,

Lee²,

Park³

2011

Electroanalysis

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We report an extraction-reconstruction strategy for obtaining a novel voltammogram for a specific electrochemical process. While a conventional voltammogram is obtained from potentiodynamic currents, our voltammogram is obtained from a large body of potentiodynamic electrochemical impedance spectra by taking advantage of their highly resolvable power. As a proof of concept, construction of a mass transfer admittance voltammogram (MTAV) is demonstrated, which is made up of purely mass transfer admittances plotted vs. potential, excluding effects from other interfering electrochemical components. We also compare the MTAV with the AC voltammogram to show its enhanced accuracy and apply the novel voltammetry to clearly determine the number of electrons transferred and diffusion coefficients, which may vary depending on experimental conditions, for a complex electrochemical reaction.

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Section: Benzoquinone Reductionmentioning

confidence: 82%

Mass‐Transfer Admittance Voltammetry from Electrochemical Impedance Spectroscopy and Its Applications

Chang¹,

Lee²,

Park³

2011

Electroanalysis

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“…More recently, Shim and Park 58,59 have argued that it is due to 1e − reduction to form the quinone radical anion. Wang and co-workers 60 disputed this interpretation suggesting, instead, that it is due to 2e − reduction to form the quinone dianion. Besides, the two peaks in the cyclic voltammogram for both electrolytes could be associated to different types of bonding or different sites of grafting 23 between the phenanthrenequinone molecules and the carbon surface.…”

Section: Improvement Of Long Time Performance By Coupling Of Differenmentioning

confidence: 99%

Strategies to Improve the Performance of Carbon/Carbon Capacitors in Salt Aqueous Electrolytes

Abbas

Ratajczak

Babuchowska

et al. 2015

J. Electrochem. Soc.

107

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Strategies are presented to enhance operating potential and cycle life of AC/AC capacitors using salt aqueous electrolytes. Li 2 SO 4 (pH = 6.5) allows 99% efficiency to be exhibited at 1.6 V cell potential with low self-discharge, while in BeSO 4 (pH = 2.1) efficiency is low (81%). Li 2 SO 4 performs better due to high di-hydrogen over-potential at the negative electrode and related pH increase in AC porosity. When stainless steel current collectors are used in Li 2 SO 4 , the cell resistance suddenly increases after 12 hours floating at 1.6 V, due to corrosion of the positive collector. With nickel negative and stainless steel positive collectors, the electrode potentials are shifted by −105 mV at cell potential of 1.6 V, allowing stable cell parameters (capacitance, resistance) and reduction of corrosion products formation on positive steel collector after 120 hours floating. Phenanthrenequinone was grafted on activated carbon to get an additional faradaic contribution in buffer solutions (pH = 4.0 or 7.2). The three-electrode cell CVs show that the redox peaks of the phenanthrenequinone graft shift toward negative values when pH increases from 4 to 7. Electrical double-layer capacitors (EDLCs) based on activated carbons (AC) and traditional aqueous electrolytes, such as H 2 SO 4 and KOH, operate at low cell potential (up to ∼0.8 V), limiting their capability at industrial level. [1][2][3][4] In order to improve the energy (E = 1 2 CU 2 ), both capacitance (C) and cell potential (U) determined by the stability window of the electrolyte have to be optimized. In this context, it has been recently demonstrated that symmetric capacitors based on AC electrodes and salt aqueous electrolyte (0.5 mol L −1 Na 2 SO 4 ) exhibit excellent cyclability under galvanostatic charge/discharge up to 1.6 V. 5,6 . While using 1 mol L −1 Li 2 SO 4 and gold current collectors, excellent cycle life has been shown up to ∼1.9 V using galvanostatic charge/discharge. 7,8 Such high cell potential value is caused by a high over-potential for di-hydrogen evolution as a consequence of water reduction and OH − ions generation in the porosity of the negative AC electrode. 5,7 According to the Nernst equation (E red = −0.059 pH), the pH increase associated to OH − ions causes locally a shift of redox potential to lower values. Based on this fact, it has been recently demonstrated that the di-hydrogen evolution over-potential is higher in almost neutral electrolyte solutions (pH = 4-8) than in acidic ones, resulting in larger operating cell potential of asymmetric capacitors in the former media.9 From the foregoing, it makes sense to study in more details the influence of aqueous electrolyte pH on the electrochemical performance of AC/AC capacitors beyond only the cell potential.Besides, when shifting from gold to stainless steel current collectors in order to develop low cost AC/AC capacitors in 1 mol L −1 Li 2 SO 4 , constant capacitance and low cell resistance have been observed during potentiostatic floating at cell potential of 1.5 V, whil...

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“…Many studies involving the reduction of 1,4-benzoquinone, BQ, have been undertaken in both aqueous [1][2][3][4][5][6][7][8][9] and non-aqueous [10][11][12][13][14][15][16][17][18][19][20][21] media. In aqueous media, it has long been established that quinones, Q, undergo reduction to form hydroquinone, H 2 Q, in the following process [1]:…”

Section: Introductionmentioning

confidence: 99%

“…and a comproportionation reaction between electrogenerated H 2 Q and parent Q leads to generation of the Q radical anion [1,2]:…”

Section: Introductionmentioning

confidence: 99%

The electrochemical reduction of 1,4-benzoquinone in 1-ethyl-3-methylimidazolium bis(trifluoromethane-sulfonyl)-imide, [C2mim][NTf2]: A voltammetric study of the comproportionation between benzoquinone and the benzoquinone dianion

Wang

Rogers

Belding

et al. 2010

Journal of Electroanalytical Chemistry

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Spectroelectrochemistry for Electroreduction of p-Benzoquinone in Unbuffered Aqueous Solution

Cited by 35 publications

References 13 publications

Mass‐Transfer Admittance Voltammetry from Electrochemical Impedance Spectroscopy and Its Applications

Mass‐Transfer Admittance Voltammetry from Electrochemical Impedance Spectroscopy and Its Applications

Strategies to Improve the Performance of Carbon/Carbon Capacitors in Salt Aqueous Electrolytes

The electrochemical reduction of 1,4-benzoquinone in 1-ethyl-3-methylimidazolium bis(trifluoromethane-sulfonyl)-imide, [C2mim][NTf2]: A voltammetric study of the comproportionation between benzoquinone and the benzoquinone dianion

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