Electrocatalytic Iodine Reduction Reaction Enabled by Aqueous Zinc-Iodine Battery with Improved Power and Energy Densities

Longtao Ma, Yiran Ying, Shengmei Chen, Zhaodong Huang, Xinliang Li, Haitao Huang, Chunyi Zhi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

3 Citations (Scopus)

Abstract

Proposed are Prussian blue analogue hosts with ordered and continuous channels, and electrocatalytic functionality with open Co and Fe species, which facilitate maximum I2 utilization efficiency and direct I2 to I conversion kinetics of the I2 reduction reaction, and free up 1/3 I from I3. Co[Co1/4Fe3/4(CN)6] exhibits a low energy barrier (0.47 kJ mol−1) and low Tafel slope (76.74 mV dec−1). Accordingly, the Co[Co1/4Fe3/4(CN)6]/I2//Zn battery delivers a capacity of 236.8 mAh g−1 at 0.1 A g−1 and a rate performance with 151.4 mAh g−1 achieved even at 20 A g−1. The battery delivers both high energy density and high-power density of 305.5 Wh kg−1 and 109.1 kW kg−1, higher than I2//Zn batteries reported to date. Furthermore, solid-state flexible batteries were constructed. A 100 mAh high capacity solid-state I2//Zn battery is demonstrated with excellent cycling performance of 81.2 % capacity retained after 400 cycles.

Original languageEnglish
Pages (from-to)3791-3798
Number of pages8
JournalAngewandte Chemie - International Edition
Volume60
Issue number7
DOIs
Publication statusPublished - 15 Feb 2021

Keywords

  • batteries
  • electrochemistry
  • iodine
  • reduction
  • zinc

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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