TY - JOUR AU - Jiang, Hanmei AU - Wang, Zegao AU - Yang, Qian AU - Tan, Luxi AU - Dong, Lichun AU - Dong, Mingdong PY - 2019/04/04 Y2 - 2024/03/29 TI - Ultrathin Ti3C2Tx (MXene) Nanosheet-Wrapped NiSe2 Octahedral Crystal for Enhanced Supercapacitor Performance and Synergetic Electrocatalytic Water Splitting JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 11 IS - SE - Articles DO - 10.1007/s40820-019-0261-5 UR - https://nmlett.org/index.php/nml/article/view/209 SP - 31 AB - <p>Metal selenides, such as NiSe<sub>2</sub>, have exhibited great potentials as multifunctional materials for energy storage and conversation. However, the utilization of pure NiSe<sub>2</sub> 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<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub><em>x</em></sub> hybrid with strong interfacial interaction and electrical properties is fabricated, by wrapping NiSe<sub>2</sub> octahedral crystal with ultrathin Ti<sub>3</sub>C<sub>2</sub>T<sub><em>x</em></sub> MXene nanosheet. The NiSe<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub><em>x</em></sub> hybrid exhibits excellent electrochemical performance, with a high specific capacitance of 531.2&nbsp;F&nbsp;g<sup>−1</sup> at 1&nbsp;A&nbsp;g<sup>−1</sup> for supercapacitor, low overpotential of 200&nbsp;mV at 10&nbsp;mA&nbsp;g<sup>−1</sup>, and small Tafel slope of 37.7&nbsp;mV&nbsp;dec<sup>−1</sup> for hydrogen evolution reaction (HER). Furthermore, greater cycling stabilities for NiSe<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub><em>x</em></sub> hybrid in both supercapacitor and HER have also been achieved. These significant improvements compared with unmodified NiSe<sub>2</sub> should be owing to the strong interfacial interaction between NiSe<sub>2</sub> octahedral crystal and Ti<sub>3</sub>C<sub>2</sub>T<sub><em>x</em></sub> 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.</p><p>Highlights:</p><p>1 A strong interfacial chemical interaction between the NiSe<sub>2</sub> nanocrystal and Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanosheet (NiSe<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) was established by wrapping NiSe<sub>2</sub> octahedral crystal with ultrathin Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanosheet.<br>2 NiSe<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> hybrid exhibits excellent performance and cycling stability both in supercapacitor and hydrogen evolution reaction.<br>3 NiSe<sub>2</sub> nanocrystals are stabilized by the covering of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene nanosheet which served as a protective layer from its oxidation.</p> ER -