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Facile fabrication of hierarchical porous carbon based on extract separated from coal with outstanding electrochemical performance

机译：基于与煤分离的提取物，具有优异的电化学性能，可轻松制备分级多孔碳

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Due to the abundant accessible pores for ion storage, hierarchical short diffusion paths for ion transport, and high diffusion efficiency through macropores, newly developed hierarchical porous carbons (HPCs) have been attracting much attention as one of the most promising electrode materials for high-performance supercapacitors. However, the large-scale production and practical applications of HPCs are still big challenges. Herein, a novel kind of HPCs were directly synthesized from low-cost extracts of coal by coupling nano MgO template with in situ KOH activation strategy. During the formation of HPCs, nano-MgO not only serves as structure-directing agent to obtain nanosheet structure, but also plays a critical role in determining the porous system and rate performance of HPCs. The HPCs feature interconnected layered structure with developed hierarchical pore system, and have a high specific surface area up to 3347 m2 g?1. As electrodes for supercapacitors, the HPCs show a high capacitance of 346 F g?1 at 0.5 A g?1 in 6 M KOH, an excellent rate performance with capacitance remaining at 262 F g?1 at 10 A g?1 and a superior cycle stability with 92% capacitance retention after 5000 cycles at 5 A g?1. The fine capacitive performances of HPCs are ascribed to hierarchical pore system, short paths for ion fast transport and 2D layered graphene sheets, make it a promising electrode candidate for high performance supercapacitors.
机译：由于丰富的离子存储孔，离子传输的分级短扩散路径以及通过大孔的高扩散效率，新开发的分级多孔碳（HPC）作为高性能的最有希望的电极材料之一已引起了广泛关注。超级电容器。但是，高性能计算的大规模生产和实际应用仍然是巨大的挑战。本文通过将纳米MgO模板与原位 KOH活化策略偶联，直接从低成本的煤中提取出新型的HPC。在HPC的形成过程中，纳米MgO不仅是获得纳米片结构的结构导向剂，而且在决定HPC的多孔体系和速率性能方面起着至关重要的作用。 HPC具有互连的分层结构和发达的分层孔隙系统，并且具有高达3347 m 2 g ？1 。作为超级电容器的电极，HPC在0.5 A g ？1 ？1 的高电容。 >在6 M KOH中，具有出色的速率性能，在10 A g ？1 <时电容保持在262 F g ？1 / small>和优异的循环稳定性，在5 A g ？1 下5000次循环后具有92％的电容保持率。 HPC的优良电容性能归因于分层孔隙系统，离子快速传输的短路径和2D分层石墨烯片，使其成为高性能超级电容器的有希望的电极候选者。

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