期刊
ACS NANO
卷 15, 期 1, 页码 1077-1085出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c07972
关键词
MXene; halogen; terminal; electrochemical property; zinc ion batteries
类别
资金
- National Natural Science Foundation of China [51902320, 21805295, U2004212]
- International Partnership Program of Chinese Academy of Sciences [174433KYSB20190019]
- Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang [2019R01003]
- Ningbo Top-Talent Team Program
- GRF [N_CityU11305218]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20170818103435068]
- Knut and Alice Wallenberg Foundation [KAW 2015.0043]
- Swedish Foundation for Strategic Research (SSF) [EM16-0004, RIF 14-0074]
- Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009 00971]
Experimental exploration of various halogen terminals on the surface of Ti3C2 MXenes showed that the presence of Br and I elements resulted in improved electrochemical performance for aqueous zinc ion batteries. The Lewis-acidic-melt etching route proved to be effective in tuning the surface chemistry of MXenes for expanding their potential applications.
The class of two-dimensional metal carbides and nitrides known as MXenes offer a distinct manner of property tailoring for a wide range of applications. The ability to tune the surface chemistry for expanding the property space of MXenes is thus an important topic, although experimental exploration of surface terminals remains a challenge. Here, we synthesized Ti3C2 MXene with unitary, binary, and ternary halogen terminals, e.g., -Cl, -Br, -I, -BrI, and -ClBrI, to investigate the effect of surface chemistry on the properties of MXenes. The electrochemical activity of Br and I elements results in the extraordinary electrochemical performance of the MXenes as cathodes for aqueous zinc ion batteries. The -Br- and -I-containing MXenes, e.g., Ti3C2Br2 and Ti3C2I2, exhibit distinct discharge platforms with considerable capacities of 97.6 and 135 mA.g(-1). Ti3C2 (BrI) and Ti3C2 (ClBrI) exhibit dual discharge platforms with capacities of 117.2 and 106.7 mAh.g(-1). In contrast, the previously discovered MXenes Ti3C2Cl2 and Ti3C2 (OF) exhibit no discharge platforms and only similar to 50% of capacities and energy densities of Ti3C2Br2. These results emphasize the effectiveness of the Lewis-acidic-melt etching route for tuning the surface chemistry of MXenes and also show promise for expanding the MXene family toward various applications.
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