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Electrochemical Performance and in Operando Charge Efficiency Measurements of Cu/Sn-Doped Nano Iron Electrodes
KTH Royal Inst Technol, Dept Chem Engn, SE-10044 Stockholm, Sweden.
KTH Royal Inst Technol, Dept Chem Engn, SE-10044 Stockholm, Sweden.
Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
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2019 (English)In: Batteries, ISSN 2313-0105, Vol. 5, no 1, article id 1Article in journal (Refereed) Published
Abstract [en]

Fe-air or Ni-Fe cells can offer low-cost and large-scale sustainable energy storage. At present, they are limited by low coulombic efficiency, low active material use, and poor rate capability. To overcome these challenges, two types of nanostructured doped iron materials were investigated: (1) copper and tin doped iron (CuSn); and (2) tin doped iron (Sn). Single-wall carbon nanotube (SWCNT) was added to the electrode and LiOH to the electrolyte. In the 2 wt. % Cu + 2 wt. % Sn sample, the addition of SWCNT increased the discharge capacity from 430 to 475 mAh g-1, and charge efficiency increased from 83% to 93.5%. With the addition of both SWCNT and LiOH, the charge efficiency and discharge capacity improved to 91% and 603 mAh g-1, respectively. Meanwhile, the 4 wt. % Sn substituted sample performance is not on par with the 2 wt. % Cu + 2 wt. % Sn sample. The dopant elements (Cu and Sn) and additives (SWCNT and LiOH) have a major impact on the electrode performance. To understand the relation between hydrogen evolution and charge current density, we have used in operando charging measurements combined with mass spectrometry to quantify the evolved hydrogen. The electrodes that were subjected to prolonged overcharge upon hydrogen evolution failed rapidly. This insight could help in the development of better charging schemes for the iron electrodes.

Place, publisher, year, edition, pages
2019. Vol. 5, no 1, article id 1
Keywords [en]
iron electrodes, Cu and Sn-doped iron, SWCNT and LiOH additives, charge efficiency, hydrogen evolution, GC-MS analysis
National Category
Materials Chemistry Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-383086DOI: 10.3390/batteries5010001ISI: 000464125800001OAI: oai:DiVA.org:uu-383086DiVA, id: diva2:1314575
Funder
Swedish Energy Agency, 39078-1Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-06-27Bibliographically approved

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