Exploring redox behavior of mixed manganese‒cobalt spinel oxides through in situ analysis
Investigating the redox behavior of manganese‒cobalt spinel oxides is essential for optimizing their electrical, catalytic, and electrochemical properties that depend on the oxidation states of Mn and Co ions. In this work, we investigated a series of Mn x Co 3‒ x O 4 (MCO, x = 0‒3) through in situ...
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| Published in | Journal of the American Ceramic Society |
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| Format | Journal Article |
| Language | English |
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27.07.2025
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| Abstract | Investigating the redox behavior of manganese‒cobalt spinel oxides is essential for optimizing their electrical, catalytic, and electrochemical properties that depend on the oxidation states of Mn and Co ions. In this work, we investigated a series of Mn x Co 3‒ x O 4 (MCO, x = 0‒3) through in situ thermogravimetric and structural analysis to evaluate how the MCO composition affects structure, phase evolution, and redox transition temperatures. Reduction in MCO proceeds via two steps whereas reoxidation of the reduction products (MnO and Co) commonly occurs in a single step. Manganese is seen to reduce the reoxidation temperatures ‐ the spinel peak was first evident at 300°C for x = 2.4 whereas that of x = 0.6 appeared at 400°C . Cobalt‐ and manganese‐rich contents ( x = 0.6 and 2.4) gave rise to CoO and Mn 2 O 3 secondary phases respectively during reoxidation. These secondary phases were first observed when the temperature reached 500°C, however, such phases diminished with increasing temperature, yielding a single phase at 800°C. In contrast, the mid‐range composition ( x = 1.8) yields single spinel phases at relatively lower temperatures. We also studied the relationship between composition and morphology of exsolved Co and MnO particles during reduction, which are of importance to catalytic applications. These findings can offer guidelines for designing MCO for catalytic and electrochemical applications. |
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| AbstractList | Investigating the redox behavior of manganese‒cobalt spinel oxides is essential for optimizing their electrical, catalytic, and electrochemical properties that depend on the oxidation states of Mn and Co ions. In this work, we investigated a series of Mn x Co 3‒ x O 4 (MCO, x = 0‒3) through in situ thermogravimetric and structural analysis to evaluate how the MCO composition affects structure, phase evolution, and redox transition temperatures. Reduction in MCO proceeds via two steps whereas reoxidation of the reduction products (MnO and Co) commonly occurs in a single step. Manganese is seen to reduce the reoxidation temperatures ‐ the spinel peak was first evident at 300°C for x = 2.4 whereas that of x = 0.6 appeared at 400°C . Cobalt‐ and manganese‐rich contents ( x = 0.6 and 2.4) gave rise to CoO and Mn 2 O 3 secondary phases respectively during reoxidation. These secondary phases were first observed when the temperature reached 500°C, however, such phases diminished with increasing temperature, yielding a single phase at 800°C. In contrast, the mid‐range composition ( x = 1.8) yields single spinel phases at relatively lower temperatures. We also studied the relationship between composition and morphology of exsolved Co and MnO particles during reduction, which are of importance to catalytic applications. These findings can offer guidelines for designing MCO for catalytic and electrochemical applications. |
| Author | Adjah‐Tetteh, Christabel Smith, Kayla S. Xu, Nengneng Zhou, Xiao‐Dong He, Zizhou Wang, Yudong |
| Author_xml | – sequence: 1 givenname: Christabel surname: Adjah‐Tetteh fullname: Adjah‐Tetteh, Christabel organization: Department of Chemical & Biomolecular Engineering University of Connecticut Storrs Connecticut USA, Center for Clean Energy Engineering University of Connecticut Storrs Connecticut USA – sequence: 2 givenname: Kayla S. surname: Smith fullname: Smith, Kayla S. organization: Department of Chemical & Biomolecular Engineering University of Connecticut Storrs Connecticut USA, Center for Clean Energy Engineering University of Connecticut Storrs Connecticut USA – sequence: 3 givenname: Zizhou surname: He fullname: He, Zizhou organization: Center for Clean Energy Engineering University of Connecticut Storrs Connecticut USA – sequence: 4 givenname: Yudong orcidid: 0000-0002-3496-5076 surname: Wang fullname: Wang, Yudong organization: Center for Clean Energy Engineering University of Connecticut Storrs Connecticut USA – sequence: 5 givenname: Nengneng surname: Xu fullname: Xu, Nengneng organization: Center for Clean Energy Engineering University of Connecticut Storrs Connecticut USA – sequence: 6 givenname: Xiao‐Dong surname: Zhou fullname: Zhou, Xiao‐Dong organization: Department of Chemical & Biomolecular Engineering University of Connecticut Storrs Connecticut USA, Center for Clean Energy Engineering University of Connecticut Storrs Connecticut USA, School of Mechanical, Aerospace, and Manufacturing Engineering University of Connecticut Storrs Connecticut USA, Department of Materials Science and Engineering University of Connecticut Storrs Connecticut USA |
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| Title | Exploring redox behavior of mixed manganese‒cobalt spinel oxides through in situ analysis |
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