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Spinel Manganese Ferrites for Oxygen Electrocatalysis: Effect of Mn Valency and Occupation Site

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Abstract

Spinel catalysts have been widely explored for the electrochemical oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). To consolidate the understanding on electrocatalysis by spinel family, intermediate spinels should be deliberately examined because most spinel oxides are of intermediate structure. Here, we report an investigation on the ORR and OER performance of intermediate spinel MnFe2O4. The modulation of cation oxidation state and inversion degree of spinel MnFe2O4 were achieved by a simple annealing process. X-ray absorption spectroscopy analysis reveals that the Mn occupancy in octahedral sites varied from 0.25 ~ 0.41 and Mn cations were oxidized from 2+ to 3+ with increasing temperature treatment. Convinced by the leading role of octahedral-geometric, we further reveal the role of Mn oxidation state through normalizing the activity to active Mn[Oh] site number. Our findings clearly indicate that Mn3+ was more catalytically active than Mn2+ in catalyzing ORR and OER.

Both Mn occupancy in octahedral site and its oxidation state play dominant roles in determining the catalytic activities of spinel manganese ferrites toward oxygen electrocatalysis.

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Acknowledgements

The authors thank the Facility for Analysis, Characterization, Testing and Simulation (FACTS) in Nanyang Technological University for materials characterizations. Authors appreciate the XAFCA beamline [30] of the Singapore Synchrotron Light Source for the XAFS characterization.

Funding

This work was supported by the Singapore Ministry of Education Tier 2 Grant (MOE2015-T2-1-020) and the Singapore National Research Foundation under its Campus for Research Excellence and Technological Enterprise (CREATE) program.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Ye Zhou & Zhichuan J. Xu

  2. Institute of Chemical and Engineering Sciences A*STAR, 1 Pesek Road, Singapore, 627833, Singapore

    Yonghua Du & Shibo Xi

  3. Solar Fuels Laboratory, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Zhichuan J. Xu

  4. Energy Research Institute @ Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore

    Zhichuan J. Xu

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  1. Ye Zhou
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  2. Yonghua Du
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  3. Shibo Xi
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  4. Zhichuan J. Xu
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Correspondence to Zhichuan J. Xu.

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Zhou, Y., Du, Y., Xi, S. et al. Spinel Manganese Ferrites for Oxygen Electrocatalysis: Effect of Mn Valency and Occupation Site. Electrocatalysis 9, 287–292 (2018). https://doi.org/10.1007/s12678-017-0429-z

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