Jiang Hanmei, Wang Zegao, Yang Qian, Tan Luxi, Dong Lichun, Dong Mingdong
Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000, Aarhus-C, Denmark.
School of Chemistry and Chemical Engineering, Key Laboratory of Low-grade Energy Utilization Technologies and Systems of the Ministry of Education, Chongqing University, Chongqing, 400044, People's Republic of China.
Nanomicro Lett. 2019 Apr 4;11(1):31. doi: 10.1007/s40820-019-0261-5.
Metal selenides, such as NiSe, have exhibited great potentials as multifunctional materials for energy storage and conversation. However, the utilization of pure NiSe 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/TiCT hybrid with strong interfacial interaction and electrical properties is fabricated, by wrapping NiSe octahedral crystal with ultrathin TiCT MXene nanosheet. The NiSe/TiCT hybrid exhibits excellent electrochemical performance, with a high specific capacitance of 531.2 F g at 1 A g for supercapacitor, low overpotential of 200 mV at 10 mA g, and small Tafel slope of 37.7 mV dec for hydrogen evolution reaction (HER). Furthermore, greater cycling stabilities for NiSe/TiCT hybrid in both supercapacitor and HER have also been achieved. These significant improvements compared with unmodified NiSe should be owing to the strong interfacial interaction between NiSe octahedral crystal and TiCT 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.
金属硒化物，如硒化镍，作为用于能量存储和转换的多功能材料已展现出巨大潜力。然而，纯硒化镍作为电极材料的应用受到其较差的循环稳定性、低电导率以及不足的电化学活性位点的限制。为弥补这些缺陷，本文通过用超薄TiCT MXene纳米片包裹硒化镍八面体晶体，制备了一种具有强界面相互作用和电学性能的新型NiSe/TiCT复合材料。NiSe/TiCT复合材料展现出优异的电化学性能，作为超级电容器在1 A g时具有531.2 F g的高比电容，在10 mA g时析氢反应（HER）的过电位低至200 mV，塔菲尔斜率为37.7 mV dec。此外，NiSe/TiCT复合材料在超级电容器和HER中均实现了更高的循环稳定性。与未改性的硒化镍相比，这些显著的改善应归因于硒化镍八面体晶体与TiCT MXene之间的强界面相互作用，这提供了增强的导电性、快速的电荷转移以及丰富的活性位点，并突出了MXene与金属硒化物组合在能量存储和转换等多功能应用中的广阔前景。
