Blar i NTNU Open på forfatter "Haarberg, Geir Martin"
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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, 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 ... -
Electrochemical Reduction of Iron Oxides in Aqueous NaOH Electrolyte Including Iron Residue from Nickel and Zinc Electrowinning Processes
Haarberg, Geir Martin; Qin, Bo; Khalaghi, Babak (Journal article, 2022)Experiments were carried out in NaOH-H2O (50–50 wt%) electrolyte with a suspension of Fe2O3 particles at ~100 ℃. A rotating disk electrode of graphite or silver was used as the cathode. The current efficiency for iron ... -
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 ... -
Electrodeoxidation of Iron Oxide in Aqueous NaOH Electrolyte
Haarberg, Geir Martin; Khalaghi, Babak (Peer reviewed; Journal article, 2020)The production of iron and steel contributes to ~10 % of global CO2 emissions. Electrolysis is an alternative route to eliminate CO2 formation. Experiments were carried out in NaOH-H2O (50-50 wt%) electrolyte with a ... -
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 Aluminium and Co-Deposition of Alloying Elements Titanium, Manganese and Silicon in Molten Fluoride Electrolyte
Haarberg, Geir Martin; Awayssa, Omar; Meirbekova, Rauan; Xu, Wenting; Saevarsdottir, Gudrun (Peer reviewed; Journal article, 2022)Primary aluminium is produced by the Hall-Heroult process which is based on electrolysis in molten fluoride electrolyte, Na3AlF6-AlF3, at ~960 oC in which the raw material alumina is dissolved and decomposed into pure ... -
Electrodeposition of aluminium containing alloys from molten fluoride electrolytes containing metal oxides
Haarberg, Geir Martin (Peer reviewed; Journal article, 2020)Aluminium is produced by the Hall-Heroult process by electrowinning in a molten fluoride electrolyte with dissolved alumina at ~955oC. Several metallic impurities typically end up in the produced metal due to the fact that ... -
Electrodeposition of aluminium-titanium alloys from molten fluoride-oxide electrolytes
Awayssa, Omar; Saevarsdottir, Gudrun; Meirbekova, Rauan; Haarberg, Geir Martin (Peer reviewed; Journal article, 2021)This study reports the direct production of an aluminium-titanium alloy during aluminium electrolysis in fluoride-based melts. Experiments were conducted in a laboratory cell dedicated to current efficiency measurements. ... -
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 ... -
Electrolysis of indium oxide in LiCl-KCl based molten salts with a liquid cathode
Cui, Peng; Qin, Bo; Martinez, Ana Maria Cuellar; Haarberg, Geir Martin (Peer reviewed; Journal article, 2020)In this work, the feasibility of extracting of metallic indium from In2O3and ITO through the direct electrochemical reduction at 450°C in molten salt LiCl-KCl was studied. Cyclic voltammetry was carried out to study the ... -
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 ... -
Electrolytic Removal of Chloride from Acidic Nitrate Solutions
Sandland, Maiken (Master thesis, 2014)Chloride containing ores are among other things often used as the raw material in metal electrowinning from aqueous solutions. The dissolution of this ore may cause problems as chlorine gas will be evolved either as a side ... -
Facile Preparation of Layered Ni(OH)2/Graphene Composite from Expanded Graphite
Qu, Renjie; Dai, Zhen; Tang, Shuihua; Zhu, Zhentao; Haarberg, Geir Martin (Journal article; Peer reviewed, 2017)A layered Ni(OH)2/graphene composite was firstly prepared by electrochemical deposition of nickel nanoparticles between layers of expanded graphite in Ni2+ containing solution, and then the deposited nickel nanoparticles ... -
Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors
Yuan, Jiawei; Tang, Shuihua; Zhu, Zhentao; Qin, Xiaolong; Qu, Renjie; Deng, Yuxiao; Wu, Lingshan; Li, Jie; Haarberg, Geir Martin (Journal article, 2017)Cost-effective commercial expanded graphite (EG) was used as a raw material, and a facile in-situ electrodeposition method was adopted to synthesize a layered Ni(OH)2/EG composite electrode in an N,N-dimethylformamide-water ... -
Gas Anodes Made of Porous Graphite for Aluminium Electrowinning
Khalaghi, Babak; Gudbrandsen, Henrik; Kjos, Ole Sigmund; Osen, Karen Sende; Paulsen, Ove; Mokkelbost, Tommy; Haarberg, Geir Martin (Journal article, 2017)One of the major downsides of the current aluminium production process is the high CO2 emission. One alternative is to replace the consumable carbon anodes with inert anodes so that oxygen evolves instead of CO2. Also PFC ... -
Gas electrodes with nickel based current collectors for molten carbonate electrolyte thermo-electrochemical cells
Kandhasamy, Sathiyaraj; Haarberg, Geir Martin; Kjelstrup, Signe; Solheim, Asbjørn (Journal article; Peer reviewed, 2019)Thermo-electrochemical cells with inexpensive molten carbonate electrolyte and (CO2|O2) gas electrodes allow the possible conversion of high temperature waste heat from industrial processes into electricity. The cell ... -
Improved catalytic activity of mixed platinum catalysts supported on various carbon nanomaterials
Zhang, Jie; Tang, Shuihua; Liao, L; Yu, W; Li, J; Seland, Frode; Haarberg, Geir Martin (Journal article; Peer reviewed, 2014)Electrocatalyst support affects not only catalytic activity of a catalyst, but also mass transportation and electron transfer in the catalyst layers of an electrode for proton exchange membrane fuel cells. Multi-dimensional ...