Oil|Water Interfacial Phosphate Transfer Facilitated by Boronic Acid: Observation of Unusually Fast Oil|Water Lateral Charge Transport

Li, Meng; Lewis, Grace E. M.; James, Tony D.; Long, Yi‐Tao; Kasprzyk-Hordern, Barbara; Mitchels, John M.; Marken, Frank

doi:10.1002/celc.201402181

Cited by 13 publications

(8 citation statements)

References 48 publications

(45 reference statements)

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“…The equation assumes an infinitely extended area and ignores the presence of the “mouth” region, but depending on the depth/aspect ratio of the microtrench electrode the approximation is acceptable. Recent applications of this type of electrode were based on the detection of nitrite and nitrate in serum 18, the suppression of chemically irreversible oxygen or ascorbate interferences 19, the amplified detection of cysteine and cystine 20, chloride determination at a boron‐doped diamond dual plate device 15, and the study of several other aqueous redox systems 21 including phosphate transfer at liquid|liquid interfaces 22.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Spinel Cobalt Ferrite Nanoparticles with Sodium Alginate as Interactive Binder

et al. 2014

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We introduce a process of making high‐capacity and rate‐capable metal‐ferrite‐based conversion anodes for lithium‐ion batteries. Cobalt ferrite (CoFe2O4) exhibits a discharge capacity that is two‐times higher compared to the state‐of‐the‐art graphite anode, but at the same time it shows high volume change (ca. 95 %) during conversion reaction with lithium in an electrochemical environment. This large volume expansion is responsible for the particle–particle and conductive‐carbon particles–active materials detachment, which leads to cyclic instability during subsequent cycles. As observed in our earlier work, any kind of weak or strong chemical interaction between active materials and binder is necessary to achieve excellent electrochemical performance in case of conversion or alloying reactions. To compare the electrochemical activity of CoFe2O4 nanoparticles against lithium, we use conventional polyvinylidene fluoride and sodium alginate binder to fabricate electrodes. Fourier‐transform infrared measurements reveal weak hydrogen‐bond formation between surface OH groups of CoFe2O4 and COOH groups of the alginate binder. Indentation tests further confirm the increased hardness of the alginate/CoFe2O4‐based electrode films. CoFe2O4–alginate–carbon anode exhibits a high specific capacity of 890 mAh g−1 at 0.1 C rate (91.4 mA g−1) after 50 charge–discharge cycles. Even at high rate cycling with current densities such as 18280 mA g−1 (20 C), the same electrode material exhibits a specific capacity of 470 mAh g−1, which is much higher than that of conventional graphite anode at the same electrochemical conditions.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Spinel Cobalt Ferrite Nanoparticles with Sodium Alginate as Interactive Binder

et al. 2014

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“…Also, the properties of the reduced hydroquinol product are currently unknown. Rather than employing a single working electrode, in the future, dual-plate bipotentiostatic experiments [39] could be employed to better reveal gradual changes in mass transport due to crystal transformations.…”

Section: Resultsmentioning

confidence: 99%

Voltammetric monitoring of a solid-liquid phase transition in N,N,N′,N′-tetraoctyl-2,6-diamino-9,10-anthraquinone (TODAQ)

Ahn

Forder

Jones

et al. 2019

J Solid State Electrochem

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Exploratory experiments on effects from a phase transition are reported for a low-melting microcrystalline anthraquinone (N,N,N′,N′-tetraoctyl-2,6-diamino-9,10-anthraquinone or TODAQ). Data for the solid-liquid phase transition are obtained by differential scanning calorimetry and then compared to data obtained by voltammetry. In preliminary electrochemical measurements, microcrystal deposits on a basal plane pyrolytic graphite electrode are shown to undergo a solid-state 2-electron 2-proton reduction in contact to aqueous 0.1 M HClO 4 with a midpoint potential E mid,solid = − 0.24 V vs. SCE. The reduction mechanism is proposed to be limited mainly by the triple phase boundary line and some transport of TODAQ molecules towards the electrode surface for both solid and melt. A change in the apparent activation energy for this reduction is observed at 69°C, leading to an enhanced increase in reduction current with midpoint potential E mid,liquid = − 0.36 V vs. SCE. A change of TODAQ transport along the crystal surface for solid microcrystalline material (for the solid) to diffusion within molten microdroplets (for the liquid) is proposed. Upon cooling, a transition at 60°C back to a higher apparent activation energy is seen consistent with re-solidification of the molten phase at the electrode surface. Differential scanning calorimetry data for solid TODAQ dry and for TODAQ in contact to aqueous 0.1 M HClO 4 confirm these transitions.

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“…Liquid/liquid ion transfer processes [1,2] are fundamentally linked to biological ion transfer across membranes and therefore of considerable interest in analytical procedures and sensing as well as in electrocatalysis, where ion transfer is part of the overall catalytic reaction sequence [3,4]. Selectivity in the transfer of specific anions is usually associated with ion hydrophobicity (which is related to the octanol-water partitioning constant for neutral molecules [5], but linked to a different more appropriate thermodynamic scale, the ion transfer potential [6,7]) and/or with facilitated ion transfer [8], where reagents such as boronic acids can bind to the transferring ion at the liquid/liquid interface.…”

Section: Introductionmentioning

confidence: 99%

Biphasic Voltammetry and Spectroelectrochemistry in Polymer of Intrinsic Microporosity—4-(3-Phenylpropyl)-Pyridine Organogel/Aqueous Electrolyte Systems: Reactivity of MnPc Versus MnTPP

et al. 2018

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A hydrophobic polymer of intrinsic microporosity (PIM-EA-TB) is employed to stabilize an organogel/aqueous electrolyte phase boundary based on an organic water-insoluble 4-(3-phenylpropyl)-pyridine phase. The organogel with electrocatalytic metal complexes embedded is immobilized on glassy carbon or on transparent mesoporous tin-doped indium oxide (ITO) electrodes. Liquid/liquid ion transfer voltammetry is investigated for a 4-(3-phenylpropyl)-pyridine organogel/aqueous electrolyte interface for two types of redox systems: tetraphenylporphyrinato-Mn(III/II) (MnTPP) and phthalocyanato-Mn(III/II) (MnPc). Electron transfer is shown to be coupled to reversible liquid/liquid anion transfer processes for PF 6 − , ClO 4 − , SCN − , and NO 3 − , with a change in mechanism for the more hydrophilic anions Cl − , F − , and SO 4 2−. In situ UV-Vis spectroelectrochemistry reveals reversible Mn(III/II) redox processes coupled to ion transfer for MnTPP. But further complexity and a detrimental side reaction are observed for MnPc causing gradual loss of the electrochemical response in the presence of dioxygen.

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Oil|Water Interfacial Phosphate Transfer Facilitated by Boronic Acid: Observation of Unusually Fast Oil|Water Lateral Charge Transport

Cited by 13 publications

References 48 publications

Electrochemical Properties of Spinel Cobalt Ferrite Nanoparticles with Sodium Alginate as Interactive Binder

Electrochemical Properties of Spinel Cobalt Ferrite Nanoparticles with Sodium Alginate as Interactive Binder

Voltammetric monitoring of a solid-liquid phase transition in N,N,N′,N′-tetraoctyl-2,6-diamino-9,10-anthraquinone (TODAQ)

Biphasic Voltammetry and Spectroelectrochemistry in Polymer of Intrinsic Microporosity—4-(3-Phenylpropyl)-Pyridine Organogel/Aqueous Electrolyte Systems: Reactivity of MnPc Versus MnTPP

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