Bidirectional manipulation of iodine redox kinetics in aqueous Fe–I₂ electrochemistry

Abstract

Catalyzing conversion is a promising approach to unlock the theoretical potentials of I2/I- redox couple in aqueous Fe-I2 electrochemistry. However, most reported results only obtain one directional efficient iodine conversion...

Rechargeable iron-ion (Fe-ion) batteries: recent progress, challenges, and perspectives

“…The charge storage mechanism reaction was investigated using various tools, including electrochemical, Raman spectra, and XPS analysis. 98 5. Anode materials metal anode should have a low overpotential for the deposition and stripping of multivalent metal ions during cycling.…”

“…The charge storage mechanism reaction was investigated using various tools, including electrochemical, Raman spectra, and XPS analysis. 98…”

“…[92][93][94] FeSO 4 salt based electrolyte was explored in different molarities ranging from 0.5 molar to 1 molar. [95][96][97][98] As reported in various studies, iron(II) trifluoromethanesulfonate (Fe(CF 3 SO 3 ) 2 , Fe(OTF) 2 ) is considered the best Fe-ion salt among the others for the aqueous rechargeable Fe-ion batteries due to high electrochemical performance. The chargedischarge schematic for an aqueous electrolyte is shown in Fig.…”

“…[103][104][105] High-purity iron foil, iron plates, Fe foam, or iron sheets are widely used as anode materials in various aqueous Fe-ion batteries. 96,[98][99][100]108,111,113,114,127 Iron nanoparticle powder was also used as the anode material after mixing with a binder and carbon-based conducting agent, as reported in various findings for aqueous Fe-ion batteries. [92][93][94] All the anode materials used in Fe-ion batteries for the non-aqueous and aqueous electrolytes are also summarized in Tables 1 and 2, respectively.…”

Unleashing the high energy potential of zinc–iodide batteries: high-loaded thick electrodes designed with zinc iodide as the cathode

“…1–5 However, the scalable application potentials of Zn–I 2 batteries are still compromised by some key inherent problems associated with iodine cathodes, such as limited utilization of active components and the significant volumetric expansion of iodine during repeated discharging/recharging processes. 6–10 While engineering the composition and/or structure of composite iodine cathodes provides possible solutions to increase iodine utilization, there is a trade-off in cathode materials between specific capacity and active materials content, thereby compromising the available specific energy of Zn–I 2 cells. 11–21 According to the latest findings in the available research, the introduction of inactive host materials usually decreases the content of active components (mostly less than 60 wt%), which is significantly different from the necessary conditions for high content in practical composite cathodes (>80 wt%, Fig.…”