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室温下具有超离子行为的化学计量二维非范德华AgCrS2
作者:小柯机器人 发布时间:2021/10/21 16:26:42

中国科学技术大学吴长征团队报道了化学计量二维非范德华AgCrS2在室温下具有超离子行为。相关研究成果发表在2021年10月18日出版的《自然—化学》。

层状材料在二维结构中的应用引起了人们极大的兴趣。通过范德华相互作用将各层连接在一起的材料,如石墨或过渡金属二卤化物,可以通过各种过程以保留单层结构和成分的方式剥离,但这对于层间相互作用较强的固体来说是困难的。

该文中,研究人员证明了AgCrS2(AMX2家族的一员)(其中A是一价金属,M是三价金属,X是硫族元素)通过嵌入四烷基铵阳离子(根据其合适的氧化还原电位选择)的剥落。剥离纳米片由夹在两个CrS2层之间的Ag层组成,其结构类似于块体中的结构。其在室温下表现出超离子行为,在298K下的离子电导率为33.2mScm-1,源于Ag+离子在相邻四面体间隙之间快速跳跃;在块体中,该行为仅在673K以上观察到。

附:英文原文

Title: Stoichiometric two-dimensional non-van der Waals AgCrS2 with superionic behaviour at room temperature

Author: Peng, Jing, Liu, Yuhua, Lv, Haifeng, Li, Yuxuan, Lin, Yue, Su, Yueqi, Wu, Jiajing, Liu, Hongfei, Guo, Yuqiao, Zhuo, Zhiwen, Wu, Xiaojun, Wu, Changzheng, Xie, Yi

Issue&Volume: 2021-10-18

Abstract: Layered materials have attracted tremendous interest for accessing two-dimensional structures. Materials such as graphite or transition metal dichalcogenides, in which the layers are held together by van der Waals interactions, can be exfoliated through a variety of processes in a manner that retains the structure and composition of the monolayers, but this has proven difficult for solids with stronger interlayer interactions. Here, we demonstrate the exfoliation of AgCrS2, a member of the AMX2 family (where A is a monovalent metal, M is a trivalent metal and X is a chalcogen), through intercalation with tetraalkylammonium cations, chosen for their suitable redox potential. The as-exfoliated nanosheets consist of Ag layers sandwiched between two CrS2 layers, similar to their structure in the bulk. They show superionic behaviour at room temperature, with an ionic conductivity of 33.2mScm1 at 298K that originates from Ag+ ions rapidly hopping between neighbouring tetrahedral interstices; in the bulk, this behaviour is only observed above 673K.

DOI: 10.1038/s41557-021-00800-4

Source: https://www.nature.com/articles/s41557-021-00800-4

期刊信息

Nature Chemistry:《自然—化学》,创刊于2009年。隶属于施普林格·自然出版集团,最新IF:21.687
官方网址:https://www.nature.com/nchem/
投稿链接:https://mts-nchem.nature.com/cgi-bin/main.plex