Issue 30, 2023

Unveiling the capacitive energy storage of linear CTAB or tetrahedral TBAB organic-molecule intercalated MoS2

Abstract

Organic-molecule insertion into MoS2 is becoming a research hotspot owing to the expanded interlayer spacing and improved electrochemical energy storage. Up to now, the effect of organic molecules with different configurations on capacitive energy storage has not been clarified. Herein, we have innovatively selected two types of organic molecules to insert into MoS2, whose configurations are linear long-chain (cetyltrimethylammonium bromide, CTAB) and tetrahedral symmetrical branched-chain (tetrabutylammonium bromide, TBAB). The interlayer spacing extends from 6.3 Å to 9.8 Å and 10.3 Å after TBAB and CTAB intercalation, respectively. Additionally, the insertion of organic molecules not only increases the content of high-valent Mo (Mo5+, Mo6+), but also introduces pyrrolic N, pyridinic N and N+, which are beneficial for capacitive energy storage. Interestingly, the linear long-chain CTAB causes MoS2 to present a broken shell hollow sphere, which can provide more channels and space for ion storage. More importantly, the migration barrier energy of Na ions between MoS2 layers and CTAB molecules is 1.01 eV, which is significantly lower than that of Na ions between MoS2 and TBAB (1.85 eV), indicating that linear organic molecules are more appropriate for ion-diffusion kinetics. This work provides a prototype for studying the effect of the organic molecular configuration on the capacitive energy storage of intercalated MoS2.

Graphical abstract: Unveiling the capacitive energy storage of linear CTAB or tetrahedral TBAB organic-molecule intercalated MoS2

Supplementary files

Article information

Article type
Paper
Submitted
10 May 2023
Accepted
07 Jul 2023
First published
10 Jul 2023

J. Mater. Chem. A, 2023,11, 16383-16394

Unveiling the capacitive energy storage of linear CTAB or tetrahedral TBAB organic-molecule intercalated MoS2

X. Wang, M. Ma, W. Wang, C. Tang, Z. Wang, J. Ru, H. Li, B. Li, Y. Zhang and X. Zhu, J. Mater. Chem. A, 2023, 11, 16383 DOI: 10.1039/D3TA02772D

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