Graphene-like porous carbon nanosheets derived from salvia splendens for high-rate performance supercapacitors
Graphene-like porous carbon nanosheets derived from salvia splendens for high-rate performance supercapacitors
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源自一串红的类石墨烯多孔碳纳米片，用于高性能超级电容器
DOI：
10.1016/j.jpowsour.2018.06.100
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发表时间：
2018-09-01
影响因子：
9.2
通讯作者：
Li, Huaming
中科院分区：
文献类型：
--
作者：
Liu, Bei;Yang, Mei;Li, Huaming
近年来，石墨烯类多孔碳纳米片(GPCN)被认为是高倍率性能超级电容器的优秀电极材料，因为2D纳米片可以将高导电性和高纵横比结合在一起，促进离子传输和电子转移。以片状植物为原料制备GPCN，对于降低生产成本，同时促进环境保护具有重要意义。在这里，我们展示了利用盐封策略来制备以花瓣为前驱体的GPCN。丹参的花瓣首先被粉碎，并用氯化钠晶体密封。在最佳温度下热解后，用水洗脱氯化钠得到丹参衍生的O/N共掺杂GPCN。所得GPCN具有较高的比表面积和适中的O，N含量。基于这些特性，基于GPCNS的超级电容器具有高倍率容量(在6M KOH和1M Na2SO4溶液中从1到100Ag(-1)的容量保持率分别为88.6%和83.4%)和良好的稳定性。考虑到植物原料的物种多样性、可再生性和丰富性，它们可以作为制备高倍率性能超级电容器用杂原子掺杂GPCN的一种新型前驱体。
Graphene-like porous carbon nanosheets (GPCNs) have recently been viewed as the outstanding electrode materials for high-rate-performance supercapacitors because the 2D nanosheets can integrate high conductivity and high aspect ratio together to promote both ion transport and electron transfer. The fabrication of GPCNs from sheet-like plant raw materials is of great importance to lowering production cost and simultaneously to promoting environment protection. Herein, we demonstrate the utilization of salt sealing strategy to fabricate GPCNs with flower petals as the precursor. The petals of salvia splendens are firstly crushed and sealed in NaCl crystal. After pyrolysis at the optimal temperature, salvia splendens-derived, O/N-codoped GPCNs are obtained by washing off NaCl with water. The resulting GPCNs possess a relatively high specific surface area and a moderate O, N contents. Owing to these characteristics, the GPCNs-based supercapacitor exhibits high rate capability (88.6% and 83.4% capacity retention from 1 to 100 A g(-1) in 6 M KOH and 1 M Na2SO4 solutions, respectively) and excellent stability. Taking into account the species diversity, renewability, and abundance of plant raw materials, they can serve as a novel kind of precursors for the fabrication of heteroatom-doped GPCNs for high-rate-performance supercapacitors.