Characterization of an AX Compound Derived from Ti2SC MAX Phase

George Hasegawa, Kei Kawahara, Kazunari Shima, Miki Inada, Naoya Enomoto, Katsuro Hayashi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Extraction of M elements from MAX phases results in “AX” compounds in contrast to the well-defined two-dimensional (2D) materials known as MXene, which are prepared by the selective etching of A elements. Despite the extensive studies on MXene from both experimental and computational aspects, the nature of the AX compounds still remains elusive, because the electrochemical etching of M atoms from MAX significantly spoils the crystal structure, predominantly resulting in amorphous AX products. Here, we demonstrate the characterization of an S/C complex prepared by the electrochemical etching of Ti2SC. The spark plasma sintering (SPS) technique affords a well-sintered Ti2SC disk with high purity, which can be directly utilized as a binder-free Ti2SC electrode. It is found that the electrochemically extracted Ti elements in NH4F electrolyte are partially crystallized into the monoclinic titanium oxynitride, TiO0.34N0.74. The formed amorphous S/C compound is classified into three components: acetone-soluble volatiles including elemental sulfur, acetone-insoluble volatiles, and non-volatile species carbonizable into S-doped carbon.

Original languageEnglish
Pages (from-to)2312-2317
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Issue number17
Publication statusPublished - May 8 2019

All Science Journal Classification (ASJC) codes

  • Inorganic Chemistry


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