Accordion-Like MXene Ti3C2Tx (HF Etching) as Cathode Host for Aqueous Zn-I2/Br2 Battery, 5 g/bottle, CAZIBCAMTCT

Accordion-like (multilayered) Ti3C2Tx MXene represents a specialized 3D morphology produced when the aluminum layer from a Ti3AlC2 MAX phase precursor is selectively etched (typically using HF or a LiF/HCl wet chemical route) without fully delaminating individual nanosheets. Instead of forming dense, tightly packed 2D paper-like films, this treatment yields an open, expanded structure with accordion-like folds. For aqueous zinc-iodine (Zn-I2) and zinc-bromine (Zn-Br2) batteries, this open architecture solves several fundamental mass-transport and confinement hurdles at the cathode.

The key structural and functional features of Accordion-like Mxene Ti3C2Tx are: (1) Expanded Interlayer Channels & Rapid Mass Transport: Standard stacked 2D MXene films can suffer from tortuous, constricted diffusion pathways that hinder rapid ion transport. The accordion-like morphology opens up wide interlayer galleries, allowing the aqueous electrolyte and bulky halogen species (I3^- or Br3^-) to diffuse freely and rapidly without mass-transport bottlenecks. (2) High Active Surface Area & Halogen Loading: The wide-open pores provide a massive electrochemically active surface area, enabling exceptionally high mass loadings of elemental iodine (I2) or bromine complexes without clogging active sites. (3) Effective Polyhalide Confinement (Shuttle Effect Mitigation): The abundant surface functional groups (-O, -OH, -F) combined with the physical confinement of the expanded 3D cavities create strong chemical adsorption energy for intermediate polyhalides (I3^-, Br3^-). This successfully traps them at the cathode and prevents migration to the zinc anode. (4) Buffering Volume Fluctuations: Halogen conversion reactions involve significant phase transitions between solid, liquid, and dissolved states. The flexible, open architecture of accordion-like MXene acts as a structural sponge that buffers local volume expansion and prevents structural pulverization during high-rate cycling.

Part Number	CAZIBCAMTCT (C-AZIB-C-AMTCT)
CAS	12363-89-2
Appearance	Dark grey to black powder
Etchant	HF
Size after Etching	2-50 um
Surface Area	15±5 m2/g
Density	3.43±0.03 g/cm3
XRD
Functional Groups	-OH, =O, -F, -Cl
Package Grade	5 g/bottle

References: 

1. X. Li, et al. Enhanced Redox Kinetics and Duration of Aqueous I2/I− Conversion Chemistry by MXene Confinement, Adv. Mater., 2021, 33, 2006897
2. X. Li, et al. Confining Aqueous Zn–Br Halide Redox Chemistry by Ti3C2TX MXene, ACS Nano (2021) 15 (1): 1718–1726.