Abstract
Rutile nickel fluoride NiF2 has a theoretically high pseudocapacitance performance in alkaline aqueous solutions, while the actual pseudocapacitance performance of an actual NiF2 electrode material is relatively low. Obviously, the actual NiF2 electrode material’s chemical activity of Ni2+ ions, crystal structure of NiF2, electron conductivity, and the amount of NiF2 that contacts with OH− definitely affect the completeness and speed of the pseudocapacitance process or reaction and further the pseudocapacitance performance. Lots of researches devote to improve these structural factors through various strategies, such as synthesizing NiF2 with large specific surface areas or excess F amount, introducing a heterogeneous metal atom (Co) to construct bimetallic fluoride NiCoF2, and introducing another heterogeneous metal atoms (Mn, Fe, Cu, Zn) to construct trimetallic fluorides, so as to benefit for the pseudocapacitance process and enhance the pseudocapacitance performance. The research status of these novel NiF2 materials, including synthetic methods, pseudocapacitance parameter test, structure characterization results representing the above mentioned structural factors, and pseudocapacitance performance, is summarized and clarified in this review. A perspective is given. This review enriches the understanding of anion storage materials.
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Thanks for the kind-hearted and warm help from my respected tutors.
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This work is financially supported by the Natural Science Foundation of Liaoning Province (2021NLTS1210), State Key Laboratory of Fine Chemicals, Dalian University of Technology (KF1708), Natural Science Foundation of Liaoning Province Department of Education (LJ2020006), and Program for the Middle-aged Innovative Talents of Shenyang (RC190166).
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Zhang, Y., Zhang, Q., Wang, L. et al. Pseudocapacitance of rutile nickel fluoride in alkaline solution—a review. Ionics 29, 4407–4416 (2023). https://doi.org/10.1007/s11581-023-05167-9
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DOI: https://doi.org/10.1007/s11581-023-05167-9