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Cu-Modified Ti3C2Cl2 MXene with Zincophilic and Hydrophobic Characteristics as a Protective Coating for Highly Stable Zn Anode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-02-12 , DOI: 10.1002/adfm.202213416
Yanze Li 1 , Qizhen Zhu 1 , Mengyao Xu 1 , Biying Zang 1 , Yue Wang 1 , Bin Xu 1
Affiliation  

Zn anode is a promising candidate for aqueous batteries, but suffers from the dendrite growth and side reaction issues, leading to short cycling life and unsatisfactory reversibility. Herein, a Cu-modified Ti3C2Cl2 MXene (Cu-MXene) with high zincophilic and hydrophobic property is prepared with a one-step molten salt etching method. Serving as a protective coating on Zn anode, the Cu-MXene can provide massive nucleation sites and uniformize the charge distribution, leading to homogenous Zn deposition. Moreover, the hydrophobic coating can prevent the Zn anode from the aqueous electrolyte, beneficial for suppressing the side reactions such as hydrogen evolution reaction and corrosion. Therefore, the stable and reversible Zn plating/stripping is achieved for the Zn anode coated by the Cu-MXene, which delivers an extended cycling life of over 1000 h with a low polarization within 120 mV at 10 mA cm−2, and a high coulombic efficiency of over 99.6% for 1100 cycles, indicating excellent stability and reversibility of Zn stripping/plating. The practical full cell coupled with NaV3O8·1.5H2O cathode also displays stable performance for 1000 cycles. The proposed Cu-MXene coating reveals a promising prospect for designing highly stable Zn anode, which can also be extended to other energy storage systems based on metal anodes.

中文翻译:

具有亲锌和疏水特性的 Cu 改性 Ti3C2Cl2 MXene 作为高稳定性锌阳极的保护涂层

锌负极是一种很有前途的水系电池候选材料,但存在枝晶生长和副反应问题,导致循环寿命短和可逆性不理想。在此,Cu 修饰的 Ti 3 C 2 Cl 2采用一步熔盐蚀刻法制备具有高亲锌和疏水性能的 MXene (Cu-MXene)。作为锌阳极的保护涂层,Cu-MXene 可以提供大量的成核位点并使电荷分布均匀,从而导致均匀的锌沉积。此外,疏水涂层可以防止锌负极与水性电解质接触,有利于抑制析氢反应和腐蚀等副反应。因此,Cu-MXene 涂层的 Zn 阳极实现了稳定且可逆的 Zn 电镀/剥离,在 10 mA cm -2 下,其循环寿命延长超过 1000 小时,极化在 120 mV 以内-2,1100次循环后的库仑效率超过99.6%,表明Zn剥离/镀锌具有出色的稳定性和可逆性。与NaV 3 O 8 ·1.5H 2 O阴极耦合的实用全电池也显示出1000次循环的稳定性能。所提出的 Cu-MXene 涂层揭示了设计高度稳定的 Zn 阳极的广阔前景,它也可以扩展到基于金属阳极的其他储能系统。
更新日期:2023-02-12
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