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32. Hierarchical MoO3‐MnNi LDH@Cu(OH)2 Core‐Shell Nanorod Arrays Constructed through In‐Situ Oxidation Combined with a Hydrothermal Strategy for High‐Performance Energy Storage.

Author

Cheng, Wenting, Huang, Wenjun, Zhang, Aitang, Du, Yiqi, Cui, Liang, Tian, Pengfei, and Liu, Jingquan

Subjects
NANORODS, ENERGY storage, NANOROD synthesis, ELECTROCHEMICAL electrodes, OXIDATION, SUPERCAPACITOR electrodes, HYDROTHERMAL synthesis
Abstract

The synthesis of layered nanorod arrays with a core‐shell structure is considered to be a viable strategy to improve the electrochemical property of electrode materials. Herein, we have successfully designed and fabricated layered MoO3‐MnNi LDH@Cu(OH)2/CF(MO‐MN LDH@COH) core‐shell nanorods through a handy in‐situ oxidation reaction followed by a hydrothermal synthesis, which consist of ordered Cu(OH)2 nanorods and ultra‐thin MoO3‐MnNi LDHs nanosheets. The MO‐MN LDH@COH which is utilized as the cathode in three electrodes exhibits superior electrochemical property. The specific capacity of prepared electrode is 16913 mF cm−2 under a current density of 2 mA cm−2, which is superior to its counterparts of COH, MN LDH@COH‐0, MO‐MN LDH@COH‐0.5 and MO‐MN LDH@COH‐2. What's more, the cycling stability reaches 83.33 % capacitance retention after 5000 cycles under the current density of 30 mA cm−2. When a solid‐state asymmetric supercapacitor (ASC) device (MO‐MN LDH@COH//AC) is fabricated, it could keep a household LED screen running for 27 minutes, verifying the immense commercial potential. Overall, this unique MO‐MN LDH@COH nanocomposite with excellent electrochemical performance should envision great practical application potential. [ABSTRACT FROM AUTHOR]

Published
2022
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35. In Situ Generation of Vertically Crossed P-Cu3Se2Ultrathin Nanosheets Derived from Cu2S Nanorod Arrays for High-Performance Supercapacitors

Author

Fu, Hucheng, Zhang, Aitang, Guo, Hanwen, Duan, Lejiao, Jin, Fuhao, Zong, Hanwen, Sun, Xiaolin, and Liu, Jingquan

Abstract

Transition-metal selenides (TMSs) have great potential in the synthesis of supercapacitor electrode materials due to their rich content and high specific capacity. However, the aggregation phenomenon of TMS materials in the process of charging and discharging will cause capacity attenuation, which seriously affects the service life and practical applications. Therefore, it is of great practical significance to design simple and efficient synthesis strategies to overcome these shortcomings. Hence, P-doped Cu3Se2nanosheets are loaded on vertically aligned Cu2S nanorod arrays to synthesize CF/Cu2S@Cu3Se2/P nanocomposites with a unique core–shell heterostructure. Notably, the Cu2S precursors can be rapidly converted into Cu3Se2nanorod arrays in situ in just 30 min at room temperature. The unique core–shell heterostructure effectively avoids the aggregation phenomenon, and the doped P elements further enhance the electrochemical properties of the electrode materials. Therefore, the as-prepared CF/Cu2S@Cu3Se2/P electrode exhibits a high areal capacitance of 5054 mF cm–2(1099 C g–1) at 3 mA cm–2and still retains 90.2% capacitance after 10 000 galvanostatic charge–discharge (GCD) cycles. The asymmetric supercapacitor (ASC) device assembled from synthetic CF/Cu2S@Cu3Se2/P and activated carbon (AC) possesses an energy density of 41.1 Wh kg–1at a power density of 480.4 W kg–1. This work shows that the designed CF/Cu2S@Cu3Se2/P electrode has broad application prospects in the field of electrochemical energy storage.

Published
2023
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