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Electrochemical Quartz Crystal Microbalance Investigation of Manganese Oxide Deposition in Sulfuric Acid Relevant for Zinc Electrowinning

Skaftun, Siri Marie; Sunde, Svein; Haarberg, Geir Martin; Seland, Frode
Journal article
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URI
http://hdl.handle.net/11250/2500115
Date
2018
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  • Institutt for materialteknologi [2407]
  • Publikasjoner fra CRIStin - NTNU [34985]
Original version
ECS Transactions. 2018, 85 (4), 103-119.  
Abstract
The deposition and dissolution of manganese oxide from a sulfuric acid solution were investigated by conventional electrochemical techniques and EQCM on gold and platinum electrodes. The product of the oxidation was found by EQCM to be MnO2 at a higher potential (1.55 V), whereas a mixture between MnOOH and MnO2 was produced at a lower potential (1.45 V). An ECE mechanism involving the formation of MnOOH was proposed as the oxidation mechanism. A higher deposit porosity was obtained at the higher deposition potentials. The reduction mechanism was proposed to involve an electrochemical reduction of MnO2 to MnOOH, followed by a chemical reaction yielding Mn2+ and MnO2.
Publisher
Electrochemical Society
Journal
ECS Transactions

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