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

  • 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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Document Type:Article
Author:Jun Wang, Emmanuel PametéORCiD, Shengli Yan, Wenhua Zhao, Jianhui Zhang, Xiaotong He, Zhazira SupiyevaORCiD, Qamar AbbasORCiD, Xuexue Pan
Parent Title (English):Electrochemistry Communications
First Page:107488
Year of first Publication:2023
Release Date:2023/04/28
Tag:Na+ diffusion coefficients; electrochemical impedance spectroscopy; galvanostatic/potentiostatic intermittent; tin phosphide; titration technique
Impact:05.443 (2021)
Funding Information:Special Project in Key Fields of General Universities in Guangdong Province (No. 2022ZDZX3086), High-level Talents Research Initiative Project of Zhongshan City (No. KYG2101, KYG2202, and KYG2302), Characteristic Innovation Project of Ordinary Colleges and Universities in Guangdong Province (No. 2022KTSCX339). HYCAP project (research grant TEAM TECH/POIR.04.04.00-00-3D6F/16-00) funded by the Foundation for Polish Sciences (FNP). The Austrian Research Promotion Agency (FFG) Austria for providing funds for the project number 39966764. Alexander von Humboldt Foundation.
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2023/057
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International