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Band Engineering of Mn-P Alloy Enables HER-suppressed Aqueous Manganese Ion Batteries.

Author information

Affiliations

  • 1. Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, 130012, P. R. China.
      Authors
    • Lu W 1
    • Zheng T 1
    • He T 1
    • Sun Y 1
    • Zhang D 1
    • Wei Z 1
    • Jiang H 1
    • Du F 1
    (8 authors)
  • 2. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
      Authors
    • Zhang X 2
    • Fan HJ 2
    (2 authors)
  • 3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China.
      Authors
    • Li S 3
    • Guan B 3
    (2 authors)

ORCIDs linked to this article

Angewandte Chemie (International ed. in English), 23 Oct 2024, :e202417171
https://doi.org/10.1002/anie.202417171 PMID: 39443294 

Abstract 

Aqueous manganese ion batteries hold potential for stationary storage applications owing to their merits in cost, energy density, and environmental sustainability. However, the formidable challenge is the instability of metallic manganese (Mn) anodes in aqueous electrolytes due to severe hydrogen evolution reaction (HER), which is more serious than the commonly studied Zn metal anodes. Moreover, the mechanism of HER side reactions has remained unclear. Herein, we design a series of Mn-P alloying anodes by precisely regulating their energy band structures to mitigate the HER issue. It is found that the serious HER primarily originates from the spontaneous Mn-H2O reaction driven by the excessively high HOMO energy level of Mn, rather than electrocatalytic water splitting. Owing to a reduced HOMO energy level and enhanced electron escape work function, the MnP anode achieves an evidently enhanced cycle durability (over 1000 hours at a high current density of 5 mA cm-2). The MnP||AgVO full cell with an N/P ratio of 4 exhibits better rate capability and extended cycle life (7000 cycles) with minimal capacity degradation than the cell using metallic Mn anode (less than 100 cycles). This study provides a practical approach for developing highly durable aqueous Mn ion batteries.

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Read article at publisher's site: https://doi.org/10.1002/anie.202417171

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Funding 

Funders who supported this work.

Department of Science and Technology of Jilin Province (1)

National Natural Science Foundation of China (4)