Scalable Dry-Pressed Electrodes Based on Holey Graphene,Accounts of Chemical Research

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Scalable Dry-Pressed Electrodes Based on Holey Graphene
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2022-09-29 , DOI: 10.1021/acs.accounts.2c00457
Yi Lin ₁ , Christian O Plaza-Rivera ₂ , Liangbing Hu _{3,

4} , John W Connell ₁

Affiliation

Holey graphene (hG) is a structural derivative of graphene with arrays of through-thickness holes of a few to tens of nanometers in diameter, randomly distributed across the nanosheet surfaces. In most bulk preparation methods, the holes on hG sheets are preferentially generated from the pre-existing defects on graphene. Therefore, contrary to intuitive belief, hG is not necessarily more defective than the intact graphene. Instead, it retains essential parent properties, including high electrical conductivity, high surface area, mechanical robustness, and chemical inertness. Furthermore, the added holey structural motif imparts unique properties that are not present in unmodified graphene, making hG advantageous in numerous applications such as sensing, membranes, reinforcements, and electrochemical energy storage. In particular, the presence of holes enhances the mass transport through the nanosheet plane and thus significantly reduces tortuosity. This difference is a key advantage for using hG in energy storage applications where the transport of ions through the thickness becomes more hindered as the electrode thickness increases to meet practical energy density requirements.

中文翻译：

基于多孔石墨烯的可扩展干压电极

多孔石墨烯 (hG) 是石墨烯的结构衍生物，具有直径为几纳米到几十纳米的通孔阵列，随机分布在纳米片表面。在大多数块体制备方法中，hG 片上的孔优先由石墨烯上预先存在的缺陷产生。因此，与直觉相反，hG 不一定比完整的石墨烯有更多缺陷。相反，它保留了基本的母体特性，包括高导电性、高表面积、机械稳健性和化学惰性。此外，添加的多孔结构基序赋予了未改性石墨烯中不存在的独特特性，使 hG 在传感、膜、增强材料和电化学储能等众多应用中具有优势。尤其是，空穴的存在增强了通过纳米片平面的质量传输，从而显着降低了弯曲度。这种差异是在能量存储应用中使用 hG 的关键优势，其中随着电极厚度的增加以满足实际能量密度要求，离子通过厚度的传输变得更加受阻。

更新日期：2022-09-29

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