材料科学
非阻塞I/O
镍
超级电容器
电极
氧化镍
氧化物
电化学
纳米棒
化学工程
异质结
二硫化钼
纳米技术
光电子学
冶金
化学
催化作用
生物化学
物理化学
工程类
作者
Guoqiang Lü,Yingjie Sun,Xinzhuan Guo,Cuizhen Yang,Yuwen Cheng,Dongming Liu
标识
DOI:10.1016/j.electacta.2024.143863
摘要
Currently, asymmetric supercapacitors (ASCs), as significant energy storage devices, have gained tremendous attention for alleviating the ever-increasing demands of carbon-free energy. Herein, metallic nickel decorated nickel oxide/molybdenum dioxide nanorods are directly anchored on porous nickel foam (Ni-NiO/MoO2/NF) by a hydrothermal method and subsequent reduction engineering under H2/Ar aura. The H2-reduction induced oxygen vacancies, multi-phase configurations, and rich interfaces synergistically enchace the electrochemical energy storage capabilities of the Ni-NiO/MoO2/NF. Notably, the density functional theory (DFT) results indicate that the generated interfaces of both Ni/NiO and Ni/MoO2 facilitate the metallic characteristic and thus enhance the electrochemical redox activity. Consequently, the Ni-NiO/MoO2/NF shows a specific capacity of 256.8 C g–1 at 1 A g–1 and 159.9 C g–1 at 20 A g–1, as well as a good cycling durability (remains 90.7% capacity after 8000 cycles) in 2.0 M of KOH media. In addition, an ASC with a voltage window of 1.4 V is constructed by employing the Ni-NiO/MoO2/NF and activated carbon (AC) as positive electrode and negative electrode, respectively, which exhibits an energy density as 28.8 Wh kg−1 at 777.8 W kg−1 and 80.2% capacity retention after 8000 charge/discharge operation. Further, a home-made ASC is assembled and exhibits potential application to power an electric fan. This work provides an efficiently way to construct multi-component electrodes with abundant heterostructures for applications in portable devices.
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