阳极
阴极
材料科学
水溶液
化学工程
储能
吸附
活性炭
碳化
介孔材料
氧化还原
容量损失
多孔性
纳米技术
碳纤维
电极
催化作用
化学
有机化学
复合数
复合材料
功率(物理)
物理化学
工程类
冶金
物理
量子力学
作者
Zhiming Zhou,Xiaoyan Zhou,Miao Zhang,Sainan Mu,Qirong Liu,Yongbing Tang
出处
期刊:Small
[Wiley]
日期:2020-08-06
卷期号:16 (35)
被引量:115
标识
DOI:10.1002/smll.202003174
摘要
Abstract Aqueous Zn‐based hybrid energy storage devices (HESDs) exhibit great potential for large‐scale energy storage applications for the merits of environmental friendliness, low redox potential, and high theoretical capacity of Zn anode. However, they are still subjected to low specific capacities since adsorption‐type cathodes (i.e., activated carbon, hard carbon) have limited capability to accommodate active ions. Herein, a hierarchical porous activated carbon cathode (HPAC) is prepared via an in situ two‐step activation strategy, different from the typical one‐step/postmortem activation of fully carbonized precursors. The strategy endows the HPAC with a high specific surface area and a large mesoporous volume, and thus provides abundant active sites and fast kinetics for accommodating active ions. Consequently, pairing the HPAC with Zn anode yields an aqueous Zn‐based HESD, which delivers a high specific capacity of 231 mAh g −1 at 0.5 A g −1 and excellent rate performance with a retained capacity of 119 mAh g −1 at 20 A g −1 , the best result among previously reported lithium‐free HESDs based on carbon cathodes. Further, the aqueous Zn‐based HESD shows ultra‐long cycling stability with a capacity retention of ≈70% after 18 000 cycles at 10 A g −1 , indicating great potential for environmentally friendly, low‐cost, and high‐safety energy storage applications.
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