Enhancing I0/I-Conversion Efficiency by Starch Confinement in Zinc-lodine Battery

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外文摘要：The redox couple of I0/I-in aqueous rechargeable iodine-zinc(12-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 Is-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.

外文关键词：

aqueous batteryconversion efficiencyiodine-zinc batterystarch confinement

作者：

Danyang Zhao、Qiancheng Zhu、Qiancheng Zhou、Wenming Zhang、Ying Yu、Shuo Chen、Zhifeng Ren

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作者单位：

Institute of Nanoscience and Nanotechnology,College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China

National&Local Joint Engineering Laboratory of New Energy Photoelectric Devices,College of Physics Science and Technology,Hebei University,Baoding 071002,China

Department of Physics and TcSUH,University of Houston,Houston Texas 77204,USA

出版年：

2024

DOI：

10.1002/eem2.12522

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(1)