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Nonepitaxial electrodeposition of (002)-textured Zn anode on textureless substrates for dendrite-free and hydrogen evolution-suppressed Zn batteries.

Jingmin ZhangWeiwei HuangLongwei LiCaiyun ChangKai YangLei GaoXiong Pu
Published in: Advanced materials (Deerfield Beach, Fla.) (2023)
Nontoxic and safe aqueous Zn batteries are largely restricted by the detrimental dendrite growth and hydrogen evolution of Zn metal anode. The (002)-textured Zn electrodeposition, demonstrated as effective approach for solving these issues, is nevertheless achieved mainly by epitaxial or hetero-epitaxial deposition of Zn on pre-textured substrates. Herein, we report the electrodeposition of (002)-textured and compact Zn on textureless substrates (commercial Zn, Cu and Ti foils) at a medium high galvanostatic current density. According to the systematic investigations on Zn nucleation and growth behaviors, this is ascribed to two reasons: (i) the promoted nonepitaxial nucleation of fine horizontal (002) nuclei at increased overpotential and (ii) the competitive growth advantages of (002)-orientated nuclei. The resulting freestanding (002)-textured Zn film exhibits significantly suppressed hydrogen evolution and prolonged Zn plating/stripping cycling life, achieving over 2100 mAh cm -2 cumulative capacity under a current density of 10 mA cm -2 and a high depth of discharge (DOD) of 45.5%. Therefore, this study provides both fundamental and practical insights for long-life Zn metal batteries. This article is protected by copyright. All rights reserved.
Keyphrases
  • heavy metals
  • air pollution
  • gold nanoparticles