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Synergistic Doping Effects of Y 3+ and Co 3+ on the Electrochemical Hydrogen Storage Property of Nanosized La 1– x Y x Fe 0.80 Co 0.20 O 3 as the Anode in Ni-MH Batteries

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Title: Synergistic Doping Effects of Y 3+ and Co 3+ on the Electrochemical Hydrogen Storage Property of Nanosized La 1– x Y x Fe 0.80 Co 0.20 O 3 as the Anode in Ni-MH Batteries
Authors: Shilong Sun, Guofang Zhang, Ruiqin Zhang, Lingsheng Liu, Yiming Li, Zhuocheng Liu, Feng Hu, Jianyi Xu, Ruihua Guo, Zhiyong Yang, Lu Bai, Yanghuan Zhang
Publication Year: 2025
Subject Terms: Medicine, Ecology, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, uv – vis, ultraviolet absorption spectra, synergistic doping effects, ray diffraction pattern, raman spectra confirm, increasingly crucial role, immense research values, catalyzed reaction activities, band gap energies, transmission electron microscopy, maximum discharge capacity, low discharge capacity, hydrogen absorption capacity, 80 , 3 , hydrogen storage performance, sample reaches 464, poor cycling stability, outstanding kinetic properties, 3 +, 20 , 12 , discharge capacity, kinetic properties, hydrogen energy
Description: As one of the important ways to obtain electrochemical hydrogen storage, nickel–metal hydride batteries (Ni-MH) play an increasingly crucial role in the field of energy storage/conversion technology and will greatly enhance the strategic position of hydrogen energy in the energy market. However, with the development of modern society, the disadvantages of poor cycling stability and low discharge capacity at high temperatures that existed for the Ni-MH batteries have severely hindered their development. To solve these drawbacks, improving the stability and discharge capacity of the batteries has immense research values. In this work, Y 3+ and Co 3+ ions codoped nanosized La 1– x Y x Fe 0.80 Co 0.20 O 3 ( x = 0, 0.04, 0.08, 0.12, 0.16, 0.20) solid solutions were synthesized via the sol–gel method. X-ray diffraction pattern (XRD) indicates that the grain sizes and cell volumes of samples are reduced. Scanning and transmission electron microscopy (SEM, TEM) results reveal that the agglomeration degrees of the codoped samples are evidently alleviated, and the crystallite sizes are refined and distributed uniformly. Ultraviolet absorption spectra (UV–vis) indicate that the band gap energies of the doped samples are decreased. Raman spectra confirm that the addition of Y 3+ ions enhances the content of the oxygen vacancies and defects in the lattices of samples. Electrochemical hydrogen storage results manifest that the electrochemical and the kinetic properties of the codoped samples are improved obviously. The maximum discharge capacity of the Y 0.12 Co 0.20 sample reaches 464.7 mAh/g at 333 K and exhibits the most outstanding kinetic properties. H 2 -TPR analysis illustrates that the catalyzed reaction activities of the codoped samples are significantly strengthened, and the hydrogen absorption capacity of the Y 0.12 Co 0.20 sample is the highest. It is analyzed that the synergistic doping effects of the two ions, the concentrations of the oxygen vacancies and defects, the capabilities of the electron transition, ...
Document Type: article in journal/newspaper
Language: unknown
DOI: 10.1021/acsanm.5c01128.s001
Availability: https://doi.org/10.1021/acsanm.5c01128.s001
https://figshare.com/articles/journal_contribution/Synergistic_Doping_Effects_of_Y_sup_3_sup_and_Co_sup_3_sup_on_the_Electrochemical_Hydrogen_Storage_Property_of_Nanosized_La_sub_1_i_x_i_sub_Y_sub_i_x_i_sub_Fe_sub_0_80_sub_Co_sub_0_20_sub_O_sub_3_sub_as_the_Anode_in_Ni-MH_Batteries/29221119
Rights: CC BY-NC 4.0
Accession Number: edsbas.B8F56040
Database: BASE
Description
Abstract:As one of the important ways to obtain electrochemical hydrogen storage, nickel–metal hydride batteries (Ni-MH) play an increasingly crucial role in the field of energy storage/conversion technology and will greatly enhance the strategic position of hydrogen energy in the energy market. However, with the development of modern society, the disadvantages of poor cycling stability and low discharge capacity at high temperatures that existed for the Ni-MH batteries have severely hindered their development. To solve these drawbacks, improving the stability and discharge capacity of the batteries has immense research values. In this work, Y 3+ and Co 3+ ions codoped nanosized La 1– x Y x Fe 0.80 Co 0.20 O 3 ( x = 0, 0.04, 0.08, 0.12, 0.16, 0.20) solid solutions were synthesized via the sol–gel method. X-ray diffraction pattern (XRD) indicates that the grain sizes and cell volumes of samples are reduced. Scanning and transmission electron microscopy (SEM, TEM) results reveal that the agglomeration degrees of the codoped samples are evidently alleviated, and the crystallite sizes are refined and distributed uniformly. Ultraviolet absorption spectra (UV–vis) indicate that the band gap energies of the doped samples are decreased. Raman spectra confirm that the addition of Y 3+ ions enhances the content of the oxygen vacancies and defects in the lattices of samples. Electrochemical hydrogen storage results manifest that the electrochemical and the kinetic properties of the codoped samples are improved obviously. The maximum discharge capacity of the Y 0.12 Co 0.20 sample reaches 464.7 mAh/g at 333 K and exhibits the most outstanding kinetic properties. H 2 -TPR analysis illustrates that the catalyzed reaction activities of the codoped samples are significantly strengthened, and the hydrogen absorption capacity of the Y 0.12 Co 0.20 sample is the highest. It is analyzed that the synergistic doping effects of the two ions, the concentrations of the oxygen vacancies and defects, the capabilities of the electron transition, ...
DOI:10.1021/acsanm.5c01128.s001