Biomass-derived three-dimensional honeycomb-like hierarchical structured carbon for ultrahigh energy density asymmetric supercapacitors
Biomass-derived three-dimensional honeycomb-like hierarchical structured carbon for ultrahigh energy density asymmetric supercapacitors
复制标题
用于超高能量密度不对称超级电容器的生物质衍生三维蜂窝状分级结构碳
DOI：
10.1039/c6ta05406d
复制
发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Fan, Zhuangjun
中科院分区：
文献类型：
--
作者：
Shan, Dandan;Yang, Jiao;Fan, Zhuangjun
源自各种生物质的多孔碳材料因其成本低廉、资源丰富、环境友好且易于制造而引起了科学界的浓厚兴趣。在此，通过一步碳化/活化丰富且低成本的细菌纤维素制备了三维蜂窝状分层结构碳（HSC），用于超高能量密度超级电容器。受益于其具有高比表面积的互连蜂窝状分层和开放结构，所制备的HSC在2 mV s−1 下表现出422 F g−1 的超高比电容，在6 M KOH水性电解质中具有出色的倍率性能（500 mV s−1 下为73.7%）。同时，对称超级电容器可以在1 M Na2SO4水性电解质中提供37.3 W h kg−1的高能量密度。为了评估实际应用，以NiCoAl层状双氢氧化物为正极、HSC为负极制备的非对称超级电容器实现了100 W h kg−1的高能量密度，即使在36.8 kW kg−1的高功率密度下仍能保留33 W h kg−1，这与之前报道的水性电解质中的非对称超级电容器高度相当甚至更高。此外，我们的非对称超级电容器表现出出色的循环稳定性，在 10 000 次循环后电容保持率为 113%。这些令人惊叹的结果将为具有高能量密度和优异的长循环寿命的下一代超快储能装置的生物质衍生碳材料提供新的线索。
Porous carbon materials derived from various biomasses have aroused intense interest from the scientific community due to their low cost, abundant resources, eco-friendliness and easy fabrication. Herein, three-dimensional honeycomb-like hierarchical structured carbon (HSC) has been fabricated by one-step carbonization/activation of abundant and low cost bacterial cellulose for ultrahigh energy density supercapacitors. Benefitting from its interconnected honeycomb-like hierarchical and open structure with a high specific surface area, the prepared HSC exhibits a superhigh specific capacitance of 422 F g−1 at 2 mV s−1 with remarkable rate performance (73.7% at 500 mV s−1) in 6 M KOH aqueous electrolyte. Meanwhile, the symmetric supercapacitor could deliver a high energy density of 37.3 W h kg−1 in 1 M Na2SO4 aqueous electrolyte. To evaluate the practical application, an asymmetric supercapacitor fabricated with NiCoAl-layered double hydroxide as the positive electrode and HSC as the negative electrode achieves a conspicuously high energy density of 100 W h kg−1 and could still retain 33 W h kg−1 even at a high power density of 36.8 kW kg−1, which is highly comparable with or even higher than those of the previously reported asymmetric supercapacitors in aqueous electrolytes. Furthermore, our asymmetric supercapacitor exhibits excellent cycling stability along with 113% capacitance retention after 10 000 cycles. Such spectacular results will shed new light on biomass-derived carbon materials for the next generation of ultrafast energy storage devices with high energy density and excellent long cycle life.