TY - JOUR
T1 - Characterization of an AX Compound Derived from Ti 2 SC MAX Phase
AU - Hasegawa, George
AU - Kawahara, Kei
AU - Shima, Kazunari
AU - Inada, Miki
AU - Enomoto, Naoya
AU - Hayashi, Katsuro
N1 - Funding Information:
This work was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant-in-Aid for Scientific Research (C) (Grant No. JP16K05935) for G. H., Grant-in-Aid for Scientific Research on Innovative Areas “Mixed Anion” (No. JP16H06439 and JP16H06440) for M. I. and K. H., and the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, Elements Strategy Initiative to Form Core Research Center (for K. H.). In addition, a part of this work was conducted in Kyushu University, supported by the MEXT Nanotechnology Platform Program (Molecule and Material Synthesis).
Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2019/5/8
Y1 - 2019/5/8
N2 - 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 Ti 2 SC. The spark plasma sintering (SPS) technique affords a well-sintered Ti 2 SC disk with high purity, which can be directly utilized as a binder-free Ti 2 SC electrode. It is found that the electrochemically extracted Ti elements in NH 4 F electrolyte are partially crystallized into the monoclinic titanium oxynitride, TiO 0.34 N 0.74 . 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.
AB - 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 Ti 2 SC. The spark plasma sintering (SPS) technique affords a well-sintered Ti 2 SC disk with high purity, which can be directly utilized as a binder-free Ti 2 SC electrode. It is found that the electrochemically extracted Ti elements in NH 4 F electrolyte are partially crystallized into the monoclinic titanium oxynitride, TiO 0.34 N 0.74 . 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.
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U2 - 10.1002/ejic.201900311
DO - 10.1002/ejic.201900311
M3 - Article
AN - SCOPUS:85064698259
VL - 2019
SP - 2312
EP - 2317
JO - Berichte der deutschen chemischen Gesellschaft
JF - Berichte der deutschen chemischen Gesellschaft
SN - 0365-9496
IS - 17
ER -