Hierarchically Porous Graphitic Carbon with Simultaneously High Surface Area and Colossal Pore Volume Engineered via Ice Templating
Hierarchically Porous Graphitic Carbon with Simultaneously High Surface Area and Colossal Pore Volume Engineered via Ice Templating
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DOI：
10.1021/acsnano.7b05085
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发表时间：
2017-11-01
期刊：
影响因子：
17.1
通讯作者：
Zhang, Ji-Guang
中科院分区：
文献类型：
--
作者：
Estevez, Luis;Prabhakaran, Venkateshkumar;Zhang, Ji-Guang
开发在一种材料中具有竞争性纹理特征（例如表面积和孔体积）的分级多孔碳（HPC）材料是难以实现的，特别是对于原子有序的石墨碳。在本文中，我们描述了一种合成策略，以在微米、介孔和大孔长度尺度上设计可调HPC材料，从而允许制造具有非常高的表面积（>2500 m2/g）和孔体积（>11 cm 3/g）的石墨HPC材料（HPC-G），这两者的组合先前尚未获得。这些材料的单独的中孔体积高达7.53cm（3）/g，这是有史以来报道的最高值，甚至高于任何多孔碳的总孔体积，对于我们的HPC-G材料，总孔体积为>11 cm（3）/g。这种HPC-G材料被探索用作超级电容器电极和油吸附，这两种应用需要高表面积或大孔体积，通常彼此排斥的纹理特性。我们通过采用冰模板不仅作为大孔形成的途径，而且作为使介孔硬模板的显著负载成为可能的协同载体来实现这些高纹理特征。HPC-G材料的这种设计方案可用于广泛的应用，包括电化学系统，如电池和超级电容器，吸附剂和催化剂载体，特别是需要高度热稳定性的载体。
Developing hierarchical porous carbon (HPC) materials with competing textural characteristics such as surface area and pore volume in one material is difficult to accomplish, particularly for an atomically ordered graphitic carbon. Herein we describe a synthesis strategy to engineer tunable HPC materials across micro-, meso-, and macroporous length scales, allowing the fabrication of a graphitic HPC material (HPC-G) with both very high surface area (>2500 m(2)/g) and pore volume (>11 cm(3)/g), the combination of which has not been attained previously. The mesopore volume alone for these materials is up to 7.53 cm(3)/g, the highest ever reported, higher than even any porous carbons total pore volume, which for our HPC-G material was >11 cm(3)/g. This HPC-G material was explored for use both as a supercapacitor electrode and for oil adsorption, two applications that require either high surface area or large pore volume, textural properties that are typically exclusive to one another. We accomplished these high textural characteristics by employing ice templating not only as a route for macroporous formation but as a synergistic vehicle that enabled the significant loading of the mesoporous hard template. This design scheme for HPC-G materials can be utilized in broad applications, including electrochemical systems such as batteries and supercapacitors, sorbents, and catalyst supports, particularly supports where a high degree of thermal stability is required.