Nan Feng1,2, Ruijin Meng1,2, Lianhai Zu1, Yutong Feng1, Chengxin Peng3, Jimei Huang1, Guanglei Liu1, Bingjie Chen1, Jinhu Yang4,5. 1. School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China. 2. Research Center for Translational Medicine and Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital Tongji University School of Medicine, No. 150 Jimo Road, Shanghai, 200120, China. 3. School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China. 4. School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China. yangjinhu@tongji.edu.cn. 5. Research Center for Translational Medicine and Key Laboratory of Arrhythmias of the Ministry of Education of China, East Hospital Tongji University School of Medicine, No. 150 Jimo Road, Shanghai, 200120, China. yangjinhu@tongji.edu.cn.
Abstract
The intercalation strategy has become crucial for 2D layered materials to achieve desirable properties, however, the intercalated guests are often limited to metal ions or small molecules. Here, we develop a simple, mild and efficient polymer-direct-intercalation strategy that different polymers (polyethyleneimine and polyethylene glycol) can directly intercalate into the MoS2 interlayers, forming MoS2-polymer composites and interlayer-expanded MoS2/carbon heteroaerogels after carbonization. The polymer-direct-intercalation behavior has been investigated by substantial characterizations and molecular dynamic calculations. The resulting composite heteroaerogels possess 3D conductive MoS2/C frameworks, expanded MoS2 interlayers (0.98 nm), high MoS2 contents (up to 74%) and high Mo valence (+6), beneficial to fast and stable charge transport and enhanced pseudocapacitive energy storage. Consequently, the typical MoS2/N-doped carbon heteroaerogels exhibit outstanding supercapacitor performance, such as ultrahigh capacitance, remarkable rate capability and excellent cycling stability. This study offers a new intercalation strategy which may be generally applicable to 2D materials for promising energy applications.
The intercalation strategy has become crucial for 2D layered materials to achieve desirable properties, however, the intercalated guests are often limited to metal ions or small molecules. Here, we develop a simple, mild and efficient n class="Chemical">polymer-direct-intercalation strategy that different polymers (polyethyleneimine and polyethylene glycol) can directly intercalate into the MoS2 interlayers, forming MoS2-polymer composites and interlayer-expanded MoS2/carbon heteroaerogels after carbonization. The polymer-direct-intercalation behavior has been investigated by substantial characterizations and molecular dynamic calculations. The resulting composite heteroaerogels possess 3D conductive MoS2/C frameworks, expanded MoS2 interlayers (0.98 nm), high MoS2 contents (up to 74%) and high Mo valence (+6), beneficial to fast and stable charge transport and enhanced pseudocapacitive energy storage. Consequently, the typical MoS2/N-doped carbon heteroaerogels exhibit outstanding supercapacitor performance, such as ultrahigh capacitance, remarkable rate capability and excellent cycling stability. This study offers a new intercalation strategy which may be generally applicable to 2D materials for promising energy applications.
Authors: Hyung Mo Jeong; Kyung Min Choi; Tao Cheng; Dong Ki Lee; Renjia Zhou; Il Woo Ock; Delia J Milliron; William A Goddard; Jeung Ku Kang Journal: Proc Natl Acad Sci U S A Date: 2015-06-15 Impact factor: 11.205