Two for One: A Biomass Strategy for Simultaneous Synthesis of MnO2 Microcubes and Porous Carbon Microcubes for High Performance Asymmetric Supercapacitors,ACS Sustainable Chemistry & Engineering

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Two for One: A Biomass Strategy for Simultaneous Synthesis of MnO2 Microcubes and Porous Carbon Microcubes for High Performance Asymmetric Supercapacitors
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-04-14 , DOI: 10.1021/acssuschemeng.0c00104
Ji Yu ₁ , Jindi Luo ₁ , Hai Zhang ₁ , Ze Zhang ₁ , Junchao Wei ₁ , Jianxin Cai ₂ , Zhenyu Yang ₁

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The capacitive properties of asymmetric supercapacitors (ASCs) are inseparable from the development of anode and cathode materials, which usually require high accessible surface area and uniform porous distribution. Herein, a simple and economical “two for one” strategy is introduced for the simultaneous synthesis of microscale porous MnO₂ microcubes (PMMs) and porous carbon microcubes (PCMs) derived from a single precursor cubic MnCO₃/biocarbon (CM) which are prepared by natural agaric. Benefiting from a high specific surface area, delicate construction, and adequate mesoporous distribution, PCMs and PMMs could help to realize fast ion diffusion and easy ion accessibility. As expected, microscale PCM anode and PMM cathode materials exhibit superior capacitive performances, including high specific capacitance and impressive rate performance in a three-electrode system, respectively. Moreover, the assembled ASCs physical device PCM//PMM presents a high energy density (46.1 Wh kg^–1 at 1.0 kW kg^–1) and an excellent long-term cyclability (91% capacitance retention after 10 000 cycles at 1.0 A g^–1). Therefore, the two-for-one strategy not only provided a simple and effective method to prepare high-performance electrode materials for ASCs, but also it is of great significance for natural biomass to achieve multidirectional applications and effectively replace commercial carbon sources from fossil fuels.

中文翻译：

二合一：高性能不对称超级电容器同时合成MnO ₂微立方和多孔碳微立方的生物质策略

非对称超级电容器（ASC）的电容特性与阳极和阴极材料的发展密不可分，阳极和阴极材料的发展通常需要较高的可及表面积和均匀的多孔分布。本文介绍了一种简单经济的“二对一”策略，用于同时合成由单个前体立方MnCO ₃衍生的微米级多孔MnO ₂微颗粒（PMM）和多孔碳微颗粒（PCM）。/生物碳（CM）由天然木耳制成。PCM和PMM得益于高的比表面积，精细的结构和足够的中孔分布，可以帮助实现快速的离子扩散和易于离子访问。如预期的那样，微型PCM阳极和PMM阴极材料分别具有出色的电容性能，包括三电极系统中的高比电容和令人印象深刻的倍率性能。此外，组装的的ASC物理设备PCM // PMM呈现高能量密度（46.1瓦千克^-1在1.0千瓦千克^-1）和优异的长期可循环性（91％容量保持后，在1.0克10 000次循环^{- 1个}）。因此，二合一策略不仅为制备ASCs高性能电极材料提供了一种简单有效的方法，而且对于天然生物质实现多方向应用并有效替代化石燃料中的商业碳源具有重要意义。。

更新日期：2020-04-23

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