Potentiometric studies on the adsorption of Au(CN)2 and Ag(CN)2 onto activated carbon

Tsuchida, Naoyuki; Muir, D.M.

doi:10.1007/bf02670218

Cited by 33 publications

(17 citation statements)

References 8 publications

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“…According to our BB-SFG spectra and results from Raman spectroscopy [37] and potentiometric measurement [40], we speculated the oxidation reactions in the anodic process as follows,…”

Section: Oxidation Of Scn à On Au Electrode Surfacementioning

confidence: 99%

Observation of gold electrode surface response to the adsorption and oxidation of thiocyanate in acidic electrolyte with broadband sum-frequency generation spectroscopy

Wang

Huang-Fu

et al. 2016

Vibrational Spectroscopy

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“…According to our BB-SFG spectra and results from Raman spectroscopy [37] and potentiometric measurement [40], we speculated the oxidation reactions in the anodic process as follows,…”

Section: Oxidation Of Scn à On Au Electrode Surfacementioning

confidence: 99%

Observation of gold electrode surface response to the adsorption and oxidation of thiocyanate in acidic electrolyte with broadband sum-frequency generation spectroscopy

Wang

Huang-Fu

et al. 2016

Vibrational Spectroscopy

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“…Studies have found that the aurocyanide complex adsorbs onto the microporous structure of the activated carbon as an ion-pair (Gross and Scott, 1927, Davidson, 1974, Adams, 1990, Adams et al, 1987, Adams et al, 1992and Adams et al, 1995. Whilst the functional groups developed during the activation process are also responsible for the adsorption of the Au complex onto the carbon surface Muir, 1986a andMuir, 1986b). In addition, Mössbauer spectroscopy studies have supported the view that the aurocyanide anion adsorbs to the surface through one of the cyanide ligands attaching to the carbon substrate (Cashion et al, 1988 andKongolo et al, 1990).…”

Section: Gold Adsorption Sitesmentioning

confidence: 99%

Adsorption of the aurocyanide, complex on granular activated carbons derived from macadamia nut shells – A preliminary study

Poinern¹,

Senanayake

Shah³

et al. 2011

Minerals Engineering

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In this study, waste macadamia nut shells were investigated for potential use as a hard organic precursor for the production of a granular activated carbon material. The processing of the macadamia shells commenced with the carbonised of the shells under a nitrogen atmosphere. This was followed by the physical activation of the shells under a carbon dioxide atmosphere, which was carried out at different temperatures to investigate the effect of the activation temperature on pore formation. The pore structure and gold loading capacity of the synthesised activated carbons were investigated. The porous nature and surface structure of the macadamia shell based activated carbon were examined by Scanning Electron Microscopy (SEM) at various stages of manufacture. In addition, gold loading studies were carried out in conjunction with elemental mapping of the activated carbon surface to determine the gold adsorption sites. The studies have revealed that the macadamia shell based carbons, activated at higher temperatures have a gold loading capacity that is comparable to the commercially available coconut based activated carbons.

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“…Figure a gives the stability diagram of water calculated by the Nernst equation E = E 0 – 0.059 × pH (V), which reflects the changes of oxidization and reduction potentials for water versus the pH values at room temperature when no overpotentials exist. − In detail, as the pH increases from 0 to 14, the water oxidation potential (i.e., oxygen evolution reaction, OER represented by red full line) shifts from 1.229 to 0.403 V (vs NHE) and, similarly, with the increase of the pH value (from 0 to 14), the water reduction potential (i.e., the hydrogen evolution reaction, HER represented by the blue full line) decreases from 0 to −0.826 V. Besides, the potential of Br – /Br 3 – redox reactions (eq ) is also marked in Figure a (represented by the yellow dashed line). , …”

Section: Resultsmentioning

confidence: 99%

Redox-Active Hydrogel Polymer Electrolytes with Different pH Values for Enhancing the Energy Density of the Hybrid Solid-State Supercapacitor

Tang

Lui

Merhi

et al. 2017

ACS Appl. Mater. Interfaces

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To enhance the energy density of solid-state supercapacitors, a novel solid-state cell, made of redox-active poly(vinyl alcohol) (PVA) hydrogel electrolytes and functionalized carbon nanotube-coated cellulose paper electrodes, was investigated in this work. Briefly, acidic PVA-[BMIM]Cl-lactic acid-LiBr and neutral PVA-[BMIM]Cl-sodium acetate-LiBr hydrogel polymer electrolytes are used as catholyte and anolyte, respectively. The acidic condition of the catholyte contributes to suppression of the undesired irreversible reaction of Br and extension of the oxygen evolution reaction potential to a higher value than that of the redox potential of Br/Br reaction. The observed Br/Br redox activity at the cathode contributes to enhance the cathode capacitance. The neutral condition of the anolyte helps extend the operating voltage window of the supercapacitor by introducing hydrogen evolution reaction overpotential to the anode. The electrosorption of nascent H on the negative electrode also increases the anode capacitance. As a result, the prepared solid-state hybrid supercapacitor shows a broad voltage window of 1.6 V, with a high Coulombic efficiency of 97.6% and the highest energy density of 16.3 Wh/kg with power density of 932.6 W/kg at 2 A/g obtained. After 10 000 cycles of galvanostatic charge and discharge tests at the current density of 10 A/g, it exhibits great cyclic stability with 93.4% retention of the initial capacitance. In addition, a robust capacitive performance can also be observed from the solid-state supercapacitor at different bending angles, indicating its great potential as a flexible energy storage device.

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Potentiometric studies on the adsorption of Au(CN)2 and Ag(CN)2 onto activated carbon

Cited by 33 publications

References 8 publications

Observation of gold electrode surface response to the adsorption and oxidation of thiocyanate in acidic electrolyte with broadband sum-frequency generation spectroscopy

Observation of gold electrode surface response to the adsorption and oxidation of thiocyanate in acidic electrolyte with broadband sum-frequency generation spectroscopy

Adsorption of the aurocyanide, complex on granular activated carbons derived from macadamia nut shells – A preliminary study

Redox-Active Hydrogel Polymer Electrolytes with Different pH Values for Enhancing the Energy Density of the Hybrid Solid-State Supercapacitor

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