Anodic behaviour of manganese in alkaline medium

Messaoudi, Bouzid; Joiret, S.; Keddam, M.; Takenouti, H.

doi:10.1016/s0013-4686(01)00449-2

Cited by 153 publications

(112 citation statements)

References 9 publications

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“…3B). As can be seen from [23] who studied anodic behavior of manganese in alkaline medium, we believe that A2 corresponds to the oxidation of Mn (II) ions to the Mn (III) redox state:…”

Section: Abrasive Stripping Voltammetry Of Peloid Sediment Samplementioning

confidence: 84%

Voltammetry as an Alternative Tool for Trace Metal Detection in Peloid Marine Sediments

2007

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Here was demonstrated for the first time a possible application of abrasive stripping voltammetry in the direct measurement of trace metals in anoxic, sulfidic marine sediments (peloid mud) from a small and shallow (0.2 -1 m) marine lagoon in Central Dalmatia, Croatia. Trace amounts of sample compounds are transferred to the graphite electrode surface and electrochemical reduction or oxidation processes are followed by the cyclic voltammetry in seawater or 0.55 M NaCl as electrolyte. After a preelectrolysis at potentials ranging from À 1.0 to À 1.5 V (vs. SCE) a well-defined anodic stripping peak corresponding to the oxidation of metal deposits generated at deposition potentials is obtained around À 0.74 V (vs. SCE). The same samples were studied by anodic stripping voltammetry at the Hg electrode and inductively coupled plasma-mass spectrometer (ICP-MS). ICP-MS showed higher concentrations of trace metals such as Al, Fe, Mo, Mn. A relatively high concentration of reduced sulfur species (RSS) (10 À3 M) is determined electrochemically in porewater of the peloid mud, indicating that the magnitude of metal enrichment in the sediments is probably controlled by precipitation with sulfide. The same electroanalytical procedure was used for the solid state phase microanalysis of synthetic zinc, ferrous, manganese and copper sulfides. In all of the investigated sulfides after their preliminary electrolytic reduction to the elementary metals which still confined to the electrode surface, similarly positioned anodic stripping peak to that of the sediment sample is recorded.

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“…3B). As can be seen from [23] who studied anodic behavior of manganese in alkaline medium, we believe that A2 corresponds to the oxidation of Mn (II) ions to the Mn (III) redox state:…”

Section: Abrasive Stripping Voltammetry Of Peloid Sediment Samplementioning

confidence: 84%

Voltammetry as an Alternative Tool for Trace Metal Detection in Peloid Marine Sediments

2007

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“…56 The Pourbaix diagram of Mn shows that MnO 2 tends to dissolve under high anodic potential, even in alkaline solutions. 23 Therefore, a low OER potential or charging voltage is desired when using MnO 2 in the bifunctional catalysts, which was achieved by coating the Co-Fe OER active layer onto MnO 2 in this work. In addition, the Co-Fe layer covering MnO 2 has more contact with the KOH electrolyte and acts as the primary OER active sites, reducing the negative impact of the oxygen evolution process.…”

Section: Resultsmentioning

confidence: 99%

“…However, anodic electrodeposition of binary or ternary metal (oxides) is difficult due to the gap in redox potentials. For anodic deposition of Mn, Co and Fe oxides, starting from their metal sulfates, the redox potential increases in the order (assuming the electrolyte for electrodeposition has a pH of 5): [23][24][25] Cathodic electrodeposition of binary or ternary metal alloys containing both Mn and Co/Fe is impossible for the same reason, since the redox potentials increase in the following order: Mn/Mn 2+ (−1.19 V vs. SHE) < Fe/Fe 2+ (−0.60 V vs. SHE) < Co/Co 2+ (−0.35 V vs. SHE). Thermodynamically favored Co/Fe deposition will lead to a strong hydrogen evolution reaction (HER) on the substrate, making it impossible to produce Mn metal.…”

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confidence: 99%

Sequentially Electrodeposited MnO_X/Co-Fe as Bifunctional Electrocatalysts for Rechargeable Zinc-Air Batteries

Xiong

Ivey

2017

J. Electrochem. Soc.

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Manganese oxide (MnOx) and cobalt-iron (Co-Fe) were sequentially electrodeposited onto a gas diffusion layer (GDL) as bifunctional electrocatalysts for rechargeable zinc-air batteries. The fabricated material was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The sequentially deposited MnOx/Co-Fe catalysts, tested using cyclic voltammetry (CV), showed activity for both the oxygen reduction and oxygen evolution reactions (ORR and OER), with better performance than either MnOx or Co-Fe alone. The fabricated material was assembled into a zinc-air battery as the air electrode component for battery cycling tests. The zinc-air battery using MnOx/Co-Fe catalysts exhibited good discharge-recharge performance and a cycling efficiency of 59.6% at 5 mA cm −2 , which is comparable to Pt/C catalysts. In addition, the electrodeposited MnOx/Co-Fe layer showed strong adhesion to the gas diffusion layer (GDL) and was structurally stable throughout 40 h of battery cycling.

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“…45,195,[274][275][276][277] The capacitance of manganese oxides comes mainly from pseudocapacitance, which is attributed to reversible redox transitions involving the exchange of protons and/or cations with the electrolyte, as well as the transitions between Mn(III)/ Mn(II), Mn(IV)/Mn(III), and Mn(VI)/Mn(IV) within the electrode potential window of the electrolyte. 278,279 The proposed mechanism is expressed in eqn (14) (14) suggests that both protons and alkali cations are involved in the redox process, and that the MnO x material must have high ionic and electronic conductivity. 270,272 Despite the clearly redox nature of the energy storage mechanism, MnO x -based electrodes can also demonstrate typical rectangular-shaped cyclic voltammetry curves (Fig.…”

Section: Mnomentioning

confidence: 99%

A review of electrode materials for electrochemical supercapacitors

2012

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=72117dd4-3024-4aa6-be53-472cfb3e5a2a http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=72117dd4-3024-4aa6-be53-472cfb3e5a2a In this critical review, metal oxides-based materials for electrochemical supercapacitor (ES) electrodes are reviewed in detail together with a brief review of carbon materials and conducting polymers. Their advantages, disadvantages, and performance in ES electrodes are discussed through extensive analysis of the literature, and new trends in material development are also reviewed. Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density of ES (476 references).

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Anodic behaviour of manganese in alkaline medium

Cited by 153 publications

References 9 publications

Voltammetry as an Alternative Tool for Trace Metal Detection in Peloid Marine Sediments

Voltammetry as an Alternative Tool for Trace Metal Detection in Peloid Marine Sediments

Sequentially Electrodeposited MnO_X/Co-Fe as Bifunctional Electrocatalysts for Rechargeable Zinc-Air Batteries

A review of electrode materials for electrochemical supercapacitors

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Anodic behaviour of manganese in alkaline medium

Cited by 153 publications

References 9 publications

Voltammetry as an Alternative Tool for Trace Metal Detection in Peloid Marine Sediments

Voltammetry as an Alternative Tool for Trace Metal Detection in Peloid Marine Sediments

Sequentially Electrodeposited MnOX/Co-Fe as Bifunctional Electrocatalysts for Rechargeable Zinc-Air Batteries

A review of electrode materials for electrochemical supercapacitors

Contact Info

Product

Resources

About

Sequentially Electrodeposited MnO_X/Co-Fe as Bifunctional Electrocatalysts for Rechargeable Zinc-Air Batteries