Enhancing I0/I- Conversion Efficiency by Starch Confinement in Zinc-Iodine Battery
Danyang Zhao , Qiancheng Zhu , Qiancheng Zhou , Wenming Zhang , Ying Yu , Shuo Chen , Zhifeng Ren
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (1) : 12522
Enhancing I0/I- Conversion Efficiency by Starch Confinement in Zinc-Iodine Battery
The redox couple of I0/I- in aqueous rechargeable iodine-zinc (I2-Zn) batteries is a promising energy storage resource since it is safe and cost-effective, and provides steady output voltage. However, the cycle life and efficiency of these batteries remain unsatisfactory due to the uncontrolled shuttling of polyiodide (I3- and I5-) and side reactions on the Zn anode. Starch is a very low-cost and widely sourced food used daily around the world. “Starch turns blue when it encounters iodine” is a classic chemical reaction, which results from the unique structure of the helix starch molecule-iodine complex. Inspired by this, we employ starch to confine the shuttling of polyiodide, and thus, the I0/I- conversion efficiency of an I2-Zn battery is clearly enhanced. According to the detailed characterizations and theoretical DFT calculation results, the enhancement of I0/I- conversion efficiency is mainly originated from the strong bonding between the charged products of I3- and I5- and the rich hydroxyl groups in starch. This work provides inspiration for the rational design of high-performance and low-cost I2-Zn in AZIBs.
aqueous battery / conversion efficiency / iodine-zinc battery / starch confinement
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2022 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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