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Understanding H2 Evolution Electrochemistry to Minimize Solvated Water Impact on Zinc-Anode Performance

Journal Article


Abstract


  • H2 evolution is the reason for poor reversibility and limited cycle stability with Zn-metal anodes, and impedes practical application in aqueous zinc-ion batteries (AZIBs). Here, using a combined gas chromatography experiment and computation, it is demonstrated that H2 evolution primarily originates from solvated water, rather than free water without interaction with Zn2+. Using linear sweep voltammetry (LSV) in salt electrolytes, H2 evolution is evidenced to occur at a more negative potential than zinc reduction because of the high overpotential against H2 evolution on Zn metal. The hypothesis is tested and, using a glycine additive to reduce solvated water, it is confirmed that H2 evolution and ���parasitic��� side reactions are suppressed on the Zn anode. This electrolyte additive is evidenced to suppress H2 evolution, reduce corrosion, and give a uniform Zn deposition in Zn|Zn and Zn|Cu cells. It is demonstrated that Zn|PANI (highly conductive polyaniline) full cells exhibit boosted electrochemical performance in 1��M ZnSO4���3��M glycine electrolyte. It is concluded that this new understanding of electrochemistry of H2 evolution can be used for design of relatively low-cost and safe AZIBs for practical large-scale energy storage.

UOW Authors


  •   Fan, Yameng (external author)
  •   Yuan, Libei (external author)
  •   Guo, Zaiping

Publication Date


  • 2022

Citation


  • Yang, F., Yuwono, J. A., Hao, J., Long, J., Yuan, L., Wang, Y., . . . Guo, Z. (2022). Understanding H2 Evolution Electrochemistry to Minimize Solvated Water Impact on Zinc-Anode Performance. Advanced Materials, 34(45). doi:10.1002/adma.202206754

Scopus Eid


  • 2-s2.0-85139944015

Volume


  • 34

Issue


  • 45

Place Of Publication


Abstract


  • H2 evolution is the reason for poor reversibility and limited cycle stability with Zn-metal anodes, and impedes practical application in aqueous zinc-ion batteries (AZIBs). Here, using a combined gas chromatography experiment and computation, it is demonstrated that H2 evolution primarily originates from solvated water, rather than free water without interaction with Zn2+. Using linear sweep voltammetry (LSV) in salt electrolytes, H2 evolution is evidenced to occur at a more negative potential than zinc reduction because of the high overpotential against H2 evolution on Zn metal. The hypothesis is tested and, using a glycine additive to reduce solvated water, it is confirmed that H2 evolution and ���parasitic��� side reactions are suppressed on the Zn anode. This electrolyte additive is evidenced to suppress H2 evolution, reduce corrosion, and give a uniform Zn deposition in Zn|Zn and Zn|Cu cells. It is demonstrated that Zn|PANI (highly conductive polyaniline) full cells exhibit boosted electrochemical performance in 1��M ZnSO4���3��M glycine electrolyte. It is concluded that this new understanding of electrochemistry of H2 evolution can be used for design of relatively low-cost and safe AZIBs for practical large-scale energy storage.

UOW Authors


  •   Fan, Yameng (external author)
  •   Yuan, Libei (external author)
  •   Guo, Zaiping

Publication Date


  • 2022

Citation


  • Yang, F., Yuwono, J. A., Hao, J., Long, J., Yuan, L., Wang, Y., . . . Guo, Z. (2022). Understanding H2 Evolution Electrochemistry to Minimize Solvated Water Impact on Zinc-Anode Performance. Advanced Materials, 34(45). doi:10.1002/adma.202206754

Scopus Eid


  • 2-s2.0-85139944015

Volume


  • 34

Issue


  • 45

Place Of Publication