阴极
材料科学
电化学
功率密度
碳纤维
化学工程
储能
电池(电)
水溶液
纳米棒
离子
密度泛函理论
电极
纳米技术
复合材料
化学
功率(物理)
物理化学
热力学
有机化学
复合数
计算化学
物理
工程类
作者
Shijun Luo,Jing Xu,Baohe Yuan,Lulu Chen,Lei Xu,Rui Zheng,Li Wang,Qian Zhang,Yang Lu,Yongsong Luo
出处
期刊:Carbon
[Elsevier]
日期:2023-07-27
卷期号:214: 118334-118334
被引量:5
标识
DOI:10.1016/j.carbon.2023.118334
摘要
Aqueous zinc-ion batteries (AZIBs) are considered potential devices for energy storage because of their low cost and high level of safety. However, the efficiency of AZIBs is influenced by the cathode reaction kinetics. Herein, we propose the δ-MnO2 nanorods grow in situ on natural loofah sponge-derived nitrogen-doped hollow carbon fibers (HCF), which can significantly improve both ion/electron transfer rate and provide structural stabilization. The self-assembled δ-MnO2-HCF (HCM) electrodes exhibit excellent electrochemical performances, including an impressively specific capacity (341 mAh g−1 at 0.2 A g−1), exceptional long cycling stability (87% capacity retention after 3500 cycles at 2 A g−1), and superb energy density and power density (540 Wh kg−1 at 288 W kg−1 and 164 Wh kg−1 at 5485 W kg−1), all based on the mass of cathode. In addition, the inclusion of HCF leads to a notable enhancement in the electrical conductivity of HCM, and a reduction in the energy barriers for Zn ions to diffuse between the δ-MnO2 layers, according to density functional theory (DFT) calculations. It is promising that the HCM will serve as a design guide for developing cost-effective and high-performance cathode materials for AZIBs.
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