Anodic electrochemistry of chalcopyrite

Biegler, T.; Swift, D.A.

doi:10.1007/bf00610940

Cited by 111 publications

(87 citation statements)

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“…Moreover, some oxidative photodecomposition reactions of CuInS 2 in aqueous acidic solutions are listed in the report of Cattarin et al 35 Thus, at the rest potential or higher anodic potential range applied in this study, several reactions can occur leading to the formation and/or the presence of several chemical species such as covellite (CuS), chalcocite (Cu 2 S), cations (Cu + , Cu 2+ , and/or In 3+ ) or elemental sulfur (S) to name the principal ones. 31,34 However, the dissolution of metals from the chalcopyrite is slow, even in highly acidic solutions, and successful methods are well-known in leaching copper. 41,42 In order to test if any dissolution or photocorrosion process at the semiconductor/electrolyte interface may interfere with the reduction of protons, cyclic voltammetry studies were performed in the dark and under illumination.…”

Section: -40mentioning

confidence: 99%

Solar hydrogen evolution using metal-free photocatalytic polymeric carbon nitride/CuInS2 composites as photocathodes

et al. 2013

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a Polymeric carbon nitride (g-C 3 N 4 ) films were synthesized on polycrystalline semiconductor CuInS 2 chalcopyrite thin film electrodes by thermal polycondensation and were investigated as photocathodes for the hydrogen evolution reaction (HER) under photoelectrochemical conditions. The composite photocathode materials were compared to g-C 3 N 4 powders and were characterized with grazing incidence X-ray diffraction and X-ray photoemission spectroscopy as well as Fourier transform infrared and Raman spectroscopies. Surface modification of polycrystalline CuInS 2 semiconducting thin films with photocatalytically active g-C 3 N 4 films revealed structural and chemical properties corresponding to the properties of g-C 3 N 4 powders. The g-C 3 N 4 /CuInS 2 composite photocathode material generates a cathodic photocurrent at potentials up to +0.36 V vs. RHE in 0.1 M H 2 SO 4 aqueous solution (pH 1), which corresponds to a +0.15 V higher onset potential of cathodic photocurrent than the unmodified CuInS 2 semiconducting thin film photocathodes. The cathodic photocurrent for the modified composite photocathode materials was reduced by almost 60% at the hydrogen redox potential. However, the photocurrent generated from the g-C 3 N 4 /CuInS 2 composite electrode was stable for 22 h. Therefore, the presence of the polymeric g-C 3 N 4 films composed of a network of nanoporous crystallites strongly protects the CuInS 2 semiconducting substrate from degradation and photocorrosion under acidic conditions. Conversion of visible light to hydrogen by photoelectrochemical water splitting can thus be successfully achieved by g-C 3 N 4 films synthesized on polycrystalline CuInS 2 chalcopyrite electrodes.

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Section: -40mentioning

confidence: 99%

Solar hydrogen evolution using metal-free photocatalytic polymeric carbon nitride/CuInS2 composites as photocathodes

et al. 2013

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“…Another phenomenon is that there is an optimum redox potential for the leaching of chalcopyrite, i.e., the leaching rate increases with increasing the redox potential and then reaches a maximum rate at an optimum redox potential, after which it decreases with the increasing of potentials, and the rate becomes less dependent on the potential at very high potentials [6,10,[22][23][24]. Besides the above two phenomena, iron is preferentially dissolved into solutions compared to copper during the initial period of chalcopyrite leaching and a copper-rich layer is formed on the surface of the chalcopyrite particles [24][25][26]. A contradiction also exists on the composition and the function of the copper-rich layer.…”

Section: Introductionmentioning

confidence: 97%

Thermodynamic Analysis of Possible Chalcopyrite Dissolution Mechanism in Sulfuric Acidic Aqueous Solution

Wang

Chang

et al. 2016

Metals

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Abstract:The dissolution routes of chalcopyrite in acidic sulfate aqueous solution have been discussed by thermodynamic calculation under different aqueous species concentrations, such as Cu 2+ , Fe 2+ and H 2 S. The results show that for both oxidative dissolution and non-oxidative dissolution of chalcopyrite, the dissolution process undergoes several intermediate steps before completely decomposing to Cu 2+ , Fe 2+ and elemental sulfur, in which bornite and covellite are the most likely intermediates. The dissolution routes of the secondary intermediates have also been discussed and covellite is the most likely final intermediate. Based on these results, some frequently reported phenomena, such as the existence of an optima redox potential range, the promotive action of the addition of Cu 2+ and Fe 2+ , as well as the preferential release of Fe 2+ in the chalcopyrite leaching process, have been explained and elucidated.

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“…There has been a lot of interest in the exhaustive oxidative electrodissolution of chalcopyrite to Cu^^, Fe^* and S° [4,10,30,33,41,44,48,53,56] CuFeS^ ;*»Cu2+ + Fe^* + S° + 5 e~…”

Section: Oxidation Of Chalcopyritementioning

confidence: 99%

“…Biegler and Swift [10] Under the same conditions, except using 1 M H^SO^ instead of 1 M HCl, the sulfur layer was nonadherent. Biegler and Swift [10] found the source of the mineral had little effect on the reactivity of the specimen.…”

Section: Oxidation Of Chalcopyritementioning

confidence: 99%

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The electrochemical dissolution of copper sulfides using a fluidized bed electrochemical reactor

Felker

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Anodic electrochemistry of chalcopyrite

Cited by 111 publications

References 9 publications

Solar hydrogen evolution using metal-free photocatalytic polymeric carbon nitride/CuInS2 composites as photocathodes

Solar hydrogen evolution using metal-free photocatalytic polymeric carbon nitride/CuInS2 composites as photocathodes

Thermodynamic Analysis of Possible Chalcopyrite Dissolution Mechanism in Sulfuric Acidic Aqueous Solution

The electrochemical dissolution of copper sulfides using a fluidized bed electrochemical reactor

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