• A concept for electrowinning of aluminium using depolarized gas anodes 

      Mokkelbost, Tommy; Kjos, Ole Sigmund; Paulsen, Ove Bjørn; Øye, Bjarte Arne; Gudbrandsen, Henrik; Ratvik, Arne Petter; Haarberg, Geir Martin (Journal article; Peer reviewed, 2014)
      Aluminium is today commercially produced by the Hall-Héroult process using consumable carbon anodes. Consumable anodes have some concerns such as CO2 emission, continuous anodecathode distance adjustments and replacements ...
    • Anodeprosesser i elektrokjemisk fremstilling av sink 

      Skaftun, Siri Marie (Master thesis, 2013)
      Målet med denne oppgaven var å studere utfellingen av manganoksid fra en svovelsur elektrolytt inneholdende manganspesier. Syklisk voltametri, lineærsveip voltametri og potensialsteg ble utført på ulike elektrodematerialer. ...
    • Calcination temperature dependent catalytic activity and stability of IrO2 – Ta2O5 anodes for oxygen evolution reaction in aqueous sulfate electrolytes 

      Xu, Wenting; Haarberg, Geir Martin; Sunde, Svein; Seland, Frode; Ratvik, Arne Petter; zimmerman, erik; Shimamune, T; Gustavsson, J; Åkre, Torjus (Journal article; Peer reviewed, 2017)
      In this work, commercial IrO2-Ta2O5 anodes with a certain composition calcined at three different temperatures were investigated. The results show that the calcination temperature has a significant influence on the ...
    • Cation Nonstoichiometry of La2CoO4 

      Karlsen, Nini (Master thesis, 2017)
      In this thesis, the cation nonstoichiometry and composition range of the La2CoO4 phase in the La-Co-O system were investigated and compared to earlier studies. There is a controversy over the cation nonstoichiometry of ...
    • Crystal Orientation of Iron Produced by Electrodeoxidation of Hematite Particles 

      Tokushige, Manabu; Kongstein, Ole Edvard; Haarberg, Geir Martin (Journal article, 2013)
      Electrowinning of iron was conducted in a 50 wt% NaOH-H2O electrolyte with suspended Fe2O3 particles at 110ºC and pure α-Fe films were obtained on a disk cathode with a higher current efficiency than 95%. The Fe2O3 particle ...
    • Depolarized SnO2-based gas anodes for electrowinning of silver in molten chlorides 

      Xiao, S; Haarberg, Geir Martin (Journal article; Peer reviewed, 2013)
      SnO2-based porous anodes were prepared and the behavior of gas bubbles on the porous anodes with different original coarse grain size, immersed in ethanol to simulate molten chlorides, was primarily investigated. SnO2-based ...
    • Direct electrochemical reduction of hematite pellets in alkaline solutions 

      Haarberg, Geir Martin; Yuan, Boyan (Journal article, 2014)
      Our previous studies on the electrowinning of iron from hematite particles suspended in sodium hydroxide solutions demonstrated that iron was produced through a direct solid phase electrochemical reduction of the oxide ...
    • Effect of composition and temperature on current efficiency for aluminium electrolysis from cryolite-based molten alumina electrolytes 

      Morishige, Taiki; Haarberg, Geir Martin; Gudbrandsen, Henrik; Skybakmoen, Egil; Solheim, Asbjørn; Takenaka, Toshihide (Journal article; Peer reviewed, 2017)
      The current efficiency (CE) for aluminium electrolysis in modern cells can be as high as 96 %. The main reason for loss in current efficiency is the so-called back reaction between dissolved metal and the anode product of ...
    • Electrochemical Behavior of Tin in Molten LiCl-KCl at 450 ℃ 

      Qin, Bo; Cui, Peng; Martinez, Ana Maria Cuellar; Haarberg, Geir Martin (Journal article; Peer reviewed, 2019)
      The electrochemical behavior of tin was studied with cyclic voltammetry at glassy carbon electrodes in the fused LiCl-KCl at 450 ℃. Metallic tin deposition on the glassy carbon electrode occurs at a potential of around ...
    • Electrochemical behaviour of dissolved iron chloride in KCl+LiCl+NaCl melt at 550 ºC 

      Khalaghi, Babak; Kvalheim, Eirin; Tokushige, Manabu; Teng, Lidong; Seetharaman, S.; Haarberg, Geir Martin (Journal article, 2014)
      An electrochemical study of iron was carried out in KCl+LiCl+NaCl melt at 550ºC using a glassy carbon working electrode. Cyclic voltammetry showed that the Fe(II)/Fe(0) electron exchange is a soluble/insoluble reversible ...
    • Electrochemical behaviour of dissolved titanium oxides during aluminium deposition from molten fluoride electrolytes 

      Haarberg, Geir Martin (Journal article, 2017)
      A small but significant amount of dissolved titanium is always present in the molten cryolite based electrolyte used during electrowinning of aluminium. The fact that titanium can appear in several oxidation states may be ...
    • Electrochemical Behaviour of Industrial IrO2-Ta2O5 Anodes for Copper Electrowinning 

      Xu, Wenting; Haarberg, Geir Martin; Sunde, Svein; Seland, Frode; Ratvik, Arne Petter; Zimmerman, Erik; Åkre, Torjus (Journal article; Peer reviewed, 2017)
      In this work, industrial IrO2-Ta2O5 anodes calcined at different temperatures were investigated. The results show that the calcination temperature has significant influence on the surface microstructure including the ...
    • 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, 2018)
      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 ...
    • Electrode behaviors of Na-Zn liquid metal battery 

      Xu, Junli; Martinez, Ana Maria Cuellar; Osen, Karen Sende; Kjos, Ole Sigmund; Kongstein, Ole Edvard; Haarberg, Geir Martin (Journal article; Peer reviewed, 2017)
      The electroreduction processes on a Mo electrode in a Na-Zn liquid metal battery cell with a molten NaCl-CaCl2-ZnCl2 electrolyte were investigated at 565°C. The effect of the battery operating parameters on the loss rate ...
    • Electrodeposition mechanism of ZnSe thin film in aqueous solution 

      Xu, Jun-Li; Gong, Wei-Ying; Wang, Wei; Meng, Hao; Zhang, Xia; Shi, Zhong-Ning; Haarberg, Geir Martin (Journal article, 2017)
      ZnSe is one of the important and excellent II–VI semiconductor materials, which has direct transition band structure. In this paper, ZnSe thin films were prepared by an electrochemical deposition method, and the formation ...
    • Electrodeposition of indium and tin from molten chloride electrolytes 

      Haarberg, Geir Martin; Qin, Bo; Martinez, Ana Maria Cuellar (Journal article; Peer reviewed, 2017)
      Recycling of electronic waste to recover the metal value is of prime importance, especially for metals with limited resources. An electrochemical approach should be an interesting option to develop sustainable recycling ...
    • Electrodeposition of Silicon in Fluoride Melts: Production of Silicon Films 

      Famiyeh, Lord (Master thesis, 2011)
      There has been considerable interest in electrodeposition of silicon from fluoride melts on a suitable substrate for its application in thin film solar cells. The goal of this work is to produce a high purity silicon films ...
    • Electrodeposition of Silicon with a Liquid Gallium Cathode in Molten Salts 

      Haarberg, Geir Martin; Kato, Tomonori; Norikawa, Yutaro; Nohira, Toshiyuki (Journal article; Peer reviewed, 2019)
      Further development of solar power depends largely on the availability of inexpensive solar grade silicon. Electrodeposition is a candidate method to produce high purity silicon at a reasonable cost. A new approach using ...
    • Electrodeposition of zinc from acidic electrolyte 

      Rosenberg, Even Andersen (Master thesis, 2017)
      Industrial zinc electrowinning is carried out in an aqueous solution of zinc sulfate in sulfuric acid. The anodes are made of a lead-silver alloy and the cathodes are made of a relatively pure aluminium alloy. A common ...
    • Electrolyte Melt Compositions for Low Temperature Molten Carbonate Thermocell 

      Kandhasamy, Sathiyaraj; Solheim, Asbjørn; Kjelstrup, Signe; Haarberg, Geir Martin (Journal article; Peer reviewed, 2018)
      Industrial processes for the production of metals and alloys by metallurgical and electrochemical methods generate a great deal of waste heat due to irreversible losses. This waste heat may be used as a power source to ...