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Ultrathin Ti 3 C 2 T x (MXene) Nanosheet-Wrapped NiSe 2 Octahedral Crystal for Enhanced Supercapacitor Performance and Synergetic Electrocatalytic Water Splitting

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  • Hanmei Jiang, School of Chemistry and Chemical Engineering, Chongqing University
  • ,
  • Zegao Wang, College of Materials Science and Engineering, Sichuan University
  • ,
  • Qian Yang
  • Luxi Tan, Chongqing University
  • ,
  • Lichun Dong, Chongqing University
  • ,
  • Mingdong Dong

Abstract: Metal selenides, such as NiSe 2 , have exhibited great potentials as multifunctional materials for energy storage and conversation. However, the utilization of pure NiSe 2 as electrode materials is limited by its poor cycling stability, low electrical conductivity, and insufficient electrochemically active sites. To remedy these defects, herein, a novel NiSe 2 /Ti 3 C 2 T x hybrid with strong interfacial interaction and electrical properties is fabricated, by wrapping NiSe 2 octahedral crystal with ultrathin Ti 3 C 2 T x MXene nanosheet. The NiSe 2 /Ti 3 C 2 T x hybrid exhibits excellent electrochemical performance, with a high specific capacitance of 531.2 F g −1 at 1 A g −1 for supercapacitor, low overpotential of 200 mV at 10 mA g −1 , and small Tafel slope of 37.7 mV dec −1 for hydrogen evolution reaction (HER). Furthermore, greater cycling stabilities for NiSe 2 /Ti 3 C 2 T x hybrid in both supercapacitor and HER have also been achieved. These significant improvements compared with unmodified NiSe 2 should be owing to the strong interfacial interaction between NiSe 2 octahedral crystal and Ti 3 C 2 T x MXene, which provides enhanced conductivity, fast charge transfer as well as abundant active sites, and highlight the promising potentials in combinations of MXene with metal selenides for multifunctional applications such as energy storage and conversion.[Figure not available: see fulltext.].

Original languageEnglish
Article number31
JournalNano-Micro Letters
Number of pages14
Publication statusPublished - 1 Apr 2019

    Research areas

  • MXene, NiSe, Supercapacitor, Water splitting

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