3D Bimodal Porous Amorphous Carbon with Self-Similar Porosity by Low-Temperature Sequential Chemical Dealloying,Chemistry of Materials

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3D Bimodal Porous Amorphous Carbon with Self-Similar Porosity by Low-Temperature Sequential Chemical Dealloying
Chemistry of Materials ( IF 7.2 ) Pub Date : 2021-02-01 , DOI: 10.1021/acs.chemmater.0c04328
Jiuhui Han _{1,

2} , Hongping Li ₃ , Zhen Lu ₄ , Gang Huang ₁ , Isaac Johnson ₅ , Kentaro Watanabe ₁ , Mingwei Chen _{1,

5}

Affiliation

Synthesizing 3D porous carbon with atomic-scale control in geometry and topology of porous architectures is of great significance while it technically remains challenging. Dealloying, the selective dissolution of less-stable elemental components from an alloy, is one of the most effective top-down approaches to fabricate 3D nanoporous materials for a wide range of functional applications. Here, we report a sequential metastable-carbide-mediated chemical dealloying approach to fabricate 3D bimodal porous amorphous carbon that possesses geometrically well-defined and topologically self-similar meso- and microporosities. The synthetic route allows independent and precise control of the bimodal porosity, by which micropores can be regulated at angstrom-scale accuracy, and mesopores can be tailored over a wide range of lengths from several nanometers to hundreds of nanometers. The 3D bimodal porous amorphous carbon enables fast ion diffusion and hence delivers outstanding rate performance when used as the anodes for Na-ion storage. This study not only offers a new method for the controllable synthesis of 3D porous carbon materials but also demonstrates the capability of dealloying as an advanced material-processing method to engineer the porous structure down to the angstrom level.

中文翻译：

低温序贯化学脱合金法制备具有自相似孔隙率的3D双峰多孔非晶碳

在多孔结构的几何形状和拓扑结构中用原子尺度控制合成3D多孔碳具有重要意义，同时在技术上仍然具有挑战性。脱合金，即从合金中选择性地溶解不太稳定的元素成分，是制造用于各种功能应用的3D纳米多孔材料的最有效的自顶向下方法之一。在这里，我们报告了一种连续的亚稳态碳化物介导的化学脱合金方法来制造3D双峰多孔无定形碳，该碳具有几何上定义明确且拓扑自相似的介孔和微孔。合成路线可独立且精确地控制双峰孔隙度，从而可以以埃级的精度调节微孔，中孔的长度可以定制，从几纳米到几百纳米。3D双峰多孔非晶碳能够实现快速的离子扩散，因此在用作Na离子存储阳极时可提供出色的倍率性能。这项研究不仅为3D多孔碳材料的可控合成提供了一种新方法，而且还证明了脱合金作为一种先进的材料加工方法能够将多孔结构工程化到埃级的能力。

更新日期：2021-02-09

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