Editors’ Choice—Understanding the Role of Multivalency in Chloride-Based Electrolytes for Efficient Iron Electrosynthesis

Le résumé fourni par la source

This study investigates aqueous electrolytes for efficient iron electrodeposition directly from Fe 3+ at ambient temperature. Concentrated lithium chloride (LiCl) based electrolytes were found to stabilize the Fe 3+ in the electrolyte, suppress parasitic hydrogen evolution and suppress redox shuttling of intermediate Fe 2+ , thus promoting efficient iron electrodeposition. These attributes collectively enabled high Coulombic efficiencies (>75%) at high current densities (>200 mA cm −2 ). Furthermore, detailed investigation revealed that increasing the LiCl concentration increased the electrolyte viscosity and decreased the Fe 2+ out-diffusion rate while also suppressing the activity of water. Sufficiently high LiCl concentrations (>7 M) thus provide a window of current densities in which elevated Coulombic efficiencies can be achieved. Overall, this paper develops an understanding of the effects of electrolyte composition on the competition between Fe electrodeposition, hydrogen co-evolution, and intermediate Fe 2+ out-diffusion for efficient Fe metal electrosynthesis.

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