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Sodium-ion diffusion coefficients in tin phosphide determined with advanced electrochemical techniques


[ 1 ] Instytut Chemii i Elektrochemii Technicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ D ] phd student | [ P ] employee

Scientific discipline (Law 2.0)

[7.6] Chemical sciences

Year of publication


Published in

Electrochemistry Communications

Journal year: 2023 | Journal volume: vol. 150

Article type

scientific article

Publication language


  • Tin phosphide
  • Na+ diffusion coefficients
  • Galvanostatic/potentiostatic intermittent
  • titration technique
  • Electrochemical impedance spectroscopy

EN 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.

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Pages (from - to)

107488-1 - 107488-6





Article number: 107488

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CC BY (attribution alone)

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open journal

Open Access Text Version

final published version

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at the time of publication

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Impact Factor

5,4 [List 2022]

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