TY - JOUR
T1 - Salt-Assisted 2H-to-1T′ Phase Transformation of Transition Metal Dichalcogenides
AU - Lai, Zhuangchai
AU - Yao, Yao
AU - Li, Siyuan
AU - Ma, Lu
AU - Zhang, Qinghua
AU - Ge, Yiyao
AU - Zhai, Wei
AU - Chi, Banlan
AU - Chen, Bo
AU - Li, Lujiang
AU - Wang, Lei
AU - Zheng, Zijian
AU - Gu, Lin
AU - Du, Yonghua
AU - Zhang, Hua
N1 - Funding Information:
Z.L., Y.Y., and S.L. contributed equally to this work. H.Z. thanks the support from the Research Grants Council of Hong Kong (Grant No. AoE/P‐701/20), ITC via the Hong Kong Branch of National Precious Metals Material Engineering Research Center (NPMM), the Start‐Up Grant (Project No.9380100) and the grants (Project Nos. 9610478, 9680314, 7020013, and 1886921) from the City University of Hong Kong, and the Science Technology and Innovation Committee of Shenzhen Municipality (Grant Nos. JCYJ20200109143412311 and SGDX2020110309300301, “Preparation of single atoms on transition metal chalcogenides for electrolytic hydrogen evolution,” CityU). This research used 7‐BM and 8‐BM of the National Synchrotron Light Source II, the U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Brookhaven National Laboratory under Contract No. DE‐SC0012704. L.W. and Z.Z. acknowledge the support from RGC Senior Research Fellow Scheme (Grant No. SRFS2122‐5S04).
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/4/18
Y1 - 2022/4/18
N2 - Phase engineering of nanomaterials (PEN) has demonstrated great potential in the fields of catalysis, electronics, energy storage and conversion, and condensed matter physics. Recently, transition metal dichalcogenides (TMDs) with unconventional metastable phases (e.g., 1T and 1T′) have attracted increasing research interest due to their unique and appealing physicochemical properties. However, there is still a lack of a simple, universal, and controlled method for the preparation of large-scale and high-purity unconventional-phase TMD crystals, restricting their further fundamental study and practical applications. Here, a facile, one-step salt-assisted general strategy is reported for the controlled phase transformation of commercially available TMDs with conventional 2H phase, yielding a large amount of metastable 1T′-phase TMDs, including WS2, WSe2, MoS2, and MoSe2. It is found that the easily accessible metal salts, such as K2C2O4·H2O, K2CO3, Na2CO3, Rb2CO3, Cs2CO3, KHCO3, NaHCO3, and NaC2O4, can be used to assist the 2H-to-1T′ phase transformation, greatly simplifying the synthetic process for producing metastable 1T′-TMDs. Importantly, this method can also be used to prepare 1T′-TMD alloys, such as 1T′-WS2xSe2(1−x). This newly developed strategy is robust and highly effective, which can also be used for the phase engineering of other materials with various polymorphs.
AB - Phase engineering of nanomaterials (PEN) has demonstrated great potential in the fields of catalysis, electronics, energy storage and conversion, and condensed matter physics. Recently, transition metal dichalcogenides (TMDs) with unconventional metastable phases (e.g., 1T and 1T′) have attracted increasing research interest due to their unique and appealing physicochemical properties. However, there is still a lack of a simple, universal, and controlled method for the preparation of large-scale and high-purity unconventional-phase TMD crystals, restricting their further fundamental study and practical applications. Here, a facile, one-step salt-assisted general strategy is reported for the controlled phase transformation of commercially available TMDs with conventional 2H phase, yielding a large amount of metastable 1T′-phase TMDs, including WS2, WSe2, MoS2, and MoSe2. It is found that the easily accessible metal salts, such as K2C2O4·H2O, K2CO3, Na2CO3, Rb2CO3, Cs2CO3, KHCO3, NaHCO3, and NaC2O4, can be used to assist the 2H-to-1T′ phase transformation, greatly simplifying the synthetic process for producing metastable 1T′-TMDs. Importantly, this method can also be used to prepare 1T′-TMD alloys, such as 1T′-WS2xSe2(1−x). This newly developed strategy is robust and highly effective, which can also be used for the phase engineering of other materials with various polymorphs.
KW - 1T′ phase
KW - metastable phase
KW - phase engineering
KW - phase transformation
KW - transition metal dichalcogenides
UR - http://www.scopus.com/inward/record.url?scp=85130269591&partnerID=8YFLogxK
U2 - 10.1002/adma.202201194
DO - 10.1002/adma.202201194
M3 - Journal article
AN - SCOPUS:85130269591
SN - 0935-9648
VL - 34
JO - Advanced Materials
JF - Advanced Materials
IS - 26
M1 - 2201194
ER -