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31. Effect of point defects on electrochemical performances of α-Ga2O3 microrods prepared with hydrothermal process for supercapacitor application.

Author

Hu, Yan-Ling, Fu, Zhengbo, Yuan, Ronghuo, Wang, Zihan, Xu, Zhihan, Dai, Yan, Fu, Yao, Li, Jiacheng, Zou, Zhimin, Jiang, Chunhai, Yang, Yun, and Song, Guang-Ling

Abstract

α-Ga2O3 microrods was deposited on carbon cloth (CC) using a hydrothermal process followed by a high-temperature annealing in air. The microstructure of the obtained Ga2O3/CC composite electrodes were characterized with scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Their electrochemical performances were tested with electrochemical impedance spectroscopy (EIS), Mott-Schottky (MS), cyclic voltammetry (CV) and galvanostatic charge/discharge techniques (GCD). By comparing the electron densities and mobilities of the Ga2O3/CC electrodes prepared with different hydrothermal durations, the doping mechanisms of point defects in α-Ga2O3 were revealed. The point defects in α-Ga2O3 including Ga-oxygen vacancies (Ga-VO), gallium vacancies (VGa), and VGa-VO complexes were all identified as the scattering centers. By extending the hydrothermal duration to more than 6 h, the electronic conductivity of the Ga2O3/CC electrode was enhanced by reducing the number of point defects in α-Ga2O3. The Ga2O3/CC-6h aqueous symmetrical supercapacitor (SC) showed a remarkable increase in the electrochemical performance by exhibiting a specific areal capacitance of 1394 mF cm−2 at 0.5 mA cm−2, with 67% of the capacitance retained when the current density was increased to 20 mA cm−2, and 76.5% of capacitance retention after 20,000 cycles under a current density of 10 mA cm−2. The point defect mechanism identified in the article would pave the way to develop novel energy storage devices based on α-Ga2O3 in the future. [ABSTRACT FROM AUTHOR]

Published
2024
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45. Facile Constructing Hierarchical Fe 3 O 4 @C Nanocomposites as Anode for Superior Lithium-Ion Storage.

Author

Zhong, Haichang, Huang, Wenlong, Wei, Yukun, Yang, Xin, Jiang, Chunhai, Liu, Hui, Zhang, Wenxian, Liang, Chu, Dai, Leyang, and Xu, Xijun

Subjects
IRON oxides, NANOCOMPOSITE materials, CARBON nanotubes, NANORODS, ANODES, CHARGE transfer
Abstract

Ferroferric oxide (Fe3O4) is regarded to be a promising high-capacity anode material for LIBs. However, the capacity attenuates fast and the rate performance is poor due to the dramatic pulverization and sluggish charge transfer properties. To solve these problems, a simple in situ encapsulation and composite method was successfully developed to construct carbon nanotube/nanorod/nanosheet-supported Fe3O4 nanoparticles. Owing to the hierarchical architecture design, the novel structure Fe3O4@C nanocomposites effectively enhance the charge transfer, alleviate pulverization, avoid the agglomeration of Fe3O4 nanoparticles, and also provide superior kinetics toward lithium storage, thereby showing significantly improved reversibility and rate performance. The carbon nanotube/nanorod supported core-shell structure Fe3O4@C nanocomposite displays outstanding high rate capability and stable cycling performance (reversible capability of 1006, 552 and 423 mA h g−1 at 0.2, 0.5 and 1 A g−1 after running 100, 300 and 500 cycles, respectively). [ABSTRACT FROM AUTHOR]

Published
2023
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