Non-Dendritic Zn Electrodeposition Enabled by Zincophilic Graphene Substrates,ACS Applied Materials & Interfaces

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Non-Dendritic Zn Electrodeposition Enabled by Zincophilic Graphene Substrates
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-11-18 , DOI: 10.1021/acsami.9b13174
Tara Foroozan ₁ , Vitaliy Yurkiv ₁ , Soroosh Sharifi-Asl ₁ , Ramin Rojaee ₁ , Farzad Mashayek ₁ , Reza Shahbazian-Yassar ₁

Affiliation

Rechargeable zinc (Zn) batteries suffer from poor cycling performance that can be attributed to dendrite growth and surface-originated side reactions. Herein, we report that cycling performance of Zn metal anode can be improved significantly by utilizing monolayer graphene (Gr) as the electrodeposition substrate. Utilizing microscopy and X-ray diffraction techniques, we demonstrate that electrodeposited Zn on Gr substrate has a compact, uniform, and nondendritic character. The Gr layer, due to its high lattice compatibility with Zn, provides low nucleation overpotential sites for Zn electrodeposition. Atomistic calculations indicate that Gr has strong affinity to Zn (binding energy of 4.41 eV for Gr with four defect sites), leading to uniform distribution of Zinc adatoms all over the Gr surface. This synergistic compatibility between Gr and Zn promotes subsequent homogeneous and planar Zn deposits with low interfacial energy (0.212 J/m²) conformal with the current collector surface.

中文翻译：

嗜锌石墨烯衬底实现的非树突状锌电沉积

可充电锌（Zn）电池的循环性能较差，这可归因于枝晶生长和表面起源的副反应。本文中，我们报道通过利用单层石墨烯（Gr）作为电沉积基材，可以显着提高Zn金属阳极的循环性能。利用显微镜和X射线衍射技术，我们证明在Gr衬底上电沉积的Zn具有致密，均匀和非枝晶的特性。由于Gr层与Zn的晶格相容性高，因此它为Zn电沉积提供了低的形核超电势位点。原子计算表明，Gr对Zn具有很强的亲和力（具有四个缺陷位点的Gr的结合能为4.41 eV），从而导致整个Zr表面上锌原子的分布均匀。²）与集电器表面共形。

更新日期：2019-11-18

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