Sodium-ion diffusion coefficients in tin phosphide determined with advanced electrochemical techniques
Wang J. Pameté E. Yan S. Zhao W. Zhang J. He X. Supiyeva Z. Abbas Q. Pan X.
May 2023Elsevier Inc.
Electrochemistry Communications
2023#150
Sodium ion insertion plays a critical role in developing robust sodium-ion technologies (batteries and hybrid supercapacitors). Diffusion coefficient values of sodium (DNa+) in tin phosphide between 0.1 V and 2.0 V vs. Na/Na+ are systematically determined by galvanostatic intermittent titration technique (GITT), electrochemical impedance spectroscopy (EIS), and potentiostatic intermittent titration technique (PITT). These values range between 4.55 × 10−12 cm2 s−1 and 1.94 × 10−8 cm2 s−1 and depend on the insertion/de-insertion current and the thickness of the electrode materials. Additionally, DNa+ values differ between the first and second cation insertion because of the solid electrolyte interface (SEI) formation. DNa+ vs. insertion potential alters non-linearly in a “W” form due to the strong interactions of Na+ with tin phosphide particles. The results reveal that GITT is a more appropriate electrochemical technique than PITT and EIS for evaluating DNa+ in tin phosphide.
Electrochemical impedance spectroscopy , Galvanostatic/potentiostatic intermittent titration technique , Na+ diffusion coefficients , Tin phosphide
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Zhongshan Polytechnic, Zhongshan, 528404, China
INM - Leibniz Institute for New Materials, Campus D2 2, Saarbrücken, 66123, Germany
Al-Farabi Kazakh National University, 71 al-Farabi Ave., Almaty, 050040, Kazakhstan
Institute of Chemistry and Technical Electrochemistry, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, Poznan, 60-965, Poland
Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, Graz, 8010, Austria
Zhongshan Polytechnic
INM - Leibniz Institute for New Materials
Al-Farabi Kazakh National University
Institute of Chemistry and Technical Electrochemistry
Institute for Chemistry and Technology of Materials
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