首页|High density anchoring of NiMoS4 on ultrathin Ti3C2 MXene assisted by dopamine for supercapacitor electrode materials
High density anchoring of NiMoS4 on ultrathin Ti3C2 MXene assisted by dopamine for supercapacitor electrode materials
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NSTL
Elsevier
MXenes have a broad application in electrochemical energy storage. However, the smooth surface of high-density MXenes makes it difficult to stabilize the anchored active material. In this study, ultrathin Ti3C2 MXenes were doped with a high density of NiMoS4 nanoparticles with the assistance of dopamine (DA). DA was adsorbed by the Ti3C2 surface (Ti3C2-DA) to form a negatively charged layer, which was beneficial for the enrichment of metal ions. NiMoS4 was anchored to Ti3C2-DA via a hydrothermal reaction. The resultant Ti3C2-DA-NiMoS4 heterostructure increased the exposure of NiMoS4 active sites, and reduced the decrease in specific capacitance caused by volume changes. Consequently, Ti3C2-DA-NiMoS4 exhibited excellent electrochemical performance with a high specific capacitance of 1288 F g?1 at 1 A g?1. In addition, an asymmetric supercapacitor based on a Ti3C2-DA-NiMoS4 positive electrode achieved a high energy density of 40.5 Wh kg?1 at 810 W kg?1, and demonstrated excellent cycling stability (capacitance retention of 89% after 9000 cycles at 10 A g?1). These results demonstrate that the Ti3C2-DA-NiMoS4 heterostructure is a prospective candidate material for high-performance supercapacitors.
HeterostructureMXeneNiMoS4Supercapacitor
Xu J.、Yang X.、Zou Y.、Xu F.、Sun L.、Xiang C.、Zhang J.、Zhu L.
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Guangxi Key Laboratory of Information Materials Guilin University of Electronic Technology
Shanghai Engineering Research Center of Advanced Thermal Functional Mateirals Shanghai Polytechnic University
NSTL
Elsevier
