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Trade-Off between Rough and Smooth Electrode Surfaces toward Stable Zn Stripping/Plating in Aqueous Electrolytes
journal contributionposted on 2024-01-05, 17:37 authored by Jin Zhang, Jie Sun, Di Yang, Shixian Ha, Teng Ma, Han Liu, Xuejian Shi, Dongxu Guo, Yizhan Wang, Yingjin Wei
The effects of surface roughness on the performance of the Zn metal anode in aqueous electrolytes are investigated by experiments and computational simulations. Smooth surfaces can homogenize the nucleation and growth of Zn, which helps to form a flat Zn anode under high current density. In spite of these advantages, the whole surface of the smooth electrode serves as the reactive contact area for parasitic reactions, generating severe hydrogen evolution, corrosion, and byproduct formation, which seriously hinder the long-term cycle stability of the Zn anode. To trade off this double-sided effect, we identify a medium degree of surface roughness that could stabilize the Zn anode for 1000 h cycling at 1.0 mAh cm–2. The electrode also enabled stable cycling for 800 h at a high current density of 5.0 mAh cm–2. This naked Zn metal anode with optimized surface roughness holds great promise for direct use in aqueous zinc ion batteries.
term cycle stabilityreactive contact areahigh current density0 mah cmsmooth electrode serves1000 h cyclingzn metal anodeflat zn anodezn anodesmooth surfaces800 hwhole surfacesurface roughnesssided effectseriously hinderparasitic reactionsmedium degreedirect usecould stabilizecomputational simulationsbyproduct formationaqueous electrolytes