New insights into the electrochemical behavior of hematite (α-Fe2O3) microparticles in strong aqueous basic electrolyte: formation of metallic iron

Manickam Minakshi, D. E. (David) Ralph, Pritam Singh, Chun-Yang Yin

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    A detailed electrochemical study of cubic α-Fe2O3 microparticles has been carried out in strong aqueous LiOH electrolyte. The α-Fe2O3 was synthesized hydrothermally and investigated in the form of an electrochemical cell using an alkaline solution, ‘α-Fe2O3|LiOH (saturated), ZnSO4 (1 M)|Zn’. In this cell, the α-Fe2O3 cathode showed a reversible capacity of ca 220 mAh/g within cut-off voltages of 0 and 1.5 V under the constant current of 0.3 mA. The electrochemical performance was attributed to the reversible formation of both proton and lithium intercalation products (FeOOH and LiFeO2) detected in the cathode material. Interestingly, at a lower discharge current of 0.1 mA, some of the hematite phase was reduced to metallic iron after yielding 336 mAh/g. The various possible electro-reduction reactions, which have direct electro-hydrometallurgical implications, are analyzed and discussed.
    Original languageEnglish
    Pages (from-to)2023–2029
    JournalMetallurgical and Materials Transactions A
    Volume45
    Issue number4
    DOIs
    Publication statusPublished - Apr 2014

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    Hematite
    microparticles
    hematite
    Electrolytes
    Cathodes
    Iron
    cathodes
    electrolytes
    iron
    Electrochemical cells
    electrochemical cells
    Intercalation
    Lithium
    intercalation
    Protons
    cut-off
    lithium
    protons
    Electric potential
    electric potential

    Cite this

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    title = "New insights into the electrochemical behavior of hematite (α-Fe2O3) microparticles in strong aqueous basic electrolyte: formation of metallic iron",
    abstract = "A detailed electrochemical study of cubic α-Fe2O3 microparticles has been carried out in strong aqueous LiOH electrolyte. The α-Fe2O3 was synthesized hydrothermally and investigated in the form of an electrochemical cell using an alkaline solution, ‘α-Fe2O3|LiOH (saturated), ZnSO4 (1 M)|Zn’. In this cell, the α-Fe2O3 cathode showed a reversible capacity of ca 220 mAh/g within cut-off voltages of 0 and 1.5 V under the constant current of 0.3 mA. The electrochemical performance was attributed to the reversible formation of both proton and lithium intercalation products (FeOOH and LiFeO2) detected in the cathode material. Interestingly, at a lower discharge current of 0.1 mA, some of the hematite phase was reduced to metallic iron after yielding 336 mAh/g. The various possible electro-reduction reactions, which have direct electro-hydrometallurgical implications, are analyzed and discussed.",
    author = "Manickam Minakshi and Ralph, {D. E. (David)} and Pritam Singh and Chun-Yang Yin",
    year = "2014",
    month = "4",
    doi = "10.1007/s11661-013-2128-6",
    language = "English",
    volume = "45",
    pages = "2023–2029",
    journal = "Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science",
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    publisher = "Springer Verlag",
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    New insights into the electrochemical behavior of hematite (α-Fe2O3) microparticles in strong aqueous basic electrolyte: formation of metallic iron. / Minakshi, Manickam; Ralph, D. E. (David); Singh, Pritam; Yin, Chun-Yang.

    In: Metallurgical and Materials Transactions A, Vol. 45, No. 4, 04.2014, p. 2023–2029.

    Research output: Contribution to journalArticleResearchpeer-review

    TY - JOUR

    T1 - New insights into the electrochemical behavior of hematite (α-Fe2O3) microparticles in strong aqueous basic electrolyte: formation of metallic iron

    AU - Minakshi, Manickam

    AU - Ralph, D. E. (David)

    AU - Singh, Pritam

    AU - Yin, Chun-Yang

    PY - 2014/4

    Y1 - 2014/4

    N2 - A detailed electrochemical study of cubic α-Fe2O3 microparticles has been carried out in strong aqueous LiOH electrolyte. The α-Fe2O3 was synthesized hydrothermally and investigated in the form of an electrochemical cell using an alkaline solution, ‘α-Fe2O3|LiOH (saturated), ZnSO4 (1 M)|Zn’. In this cell, the α-Fe2O3 cathode showed a reversible capacity of ca 220 mAh/g within cut-off voltages of 0 and 1.5 V under the constant current of 0.3 mA. The electrochemical performance was attributed to the reversible formation of both proton and lithium intercalation products (FeOOH and LiFeO2) detected in the cathode material. Interestingly, at a lower discharge current of 0.1 mA, some of the hematite phase was reduced to metallic iron after yielding 336 mAh/g. The various possible electro-reduction reactions, which have direct electro-hydrometallurgical implications, are analyzed and discussed.

    AB - A detailed electrochemical study of cubic α-Fe2O3 microparticles has been carried out in strong aqueous LiOH electrolyte. The α-Fe2O3 was synthesized hydrothermally and investigated in the form of an electrochemical cell using an alkaline solution, ‘α-Fe2O3|LiOH (saturated), ZnSO4 (1 M)|Zn’. In this cell, the α-Fe2O3 cathode showed a reversible capacity of ca 220 mAh/g within cut-off voltages of 0 and 1.5 V under the constant current of 0.3 mA. The electrochemical performance was attributed to the reversible formation of both proton and lithium intercalation products (FeOOH and LiFeO2) detected in the cathode material. Interestingly, at a lower discharge current of 0.1 mA, some of the hematite phase was reduced to metallic iron after yielding 336 mAh/g. The various possible electro-reduction reactions, which have direct electro-hydrometallurgical implications, are analyzed and discussed.

    U2 - 10.1007/s11661-013-2128-6

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