Metallic 1T MoS₂ is a promising anode candidate for supercapacitors due to its intrinsically excellent electrical conductivity and high electrochemical activity. However, it is quite unstable and hard to be massively synthesized through common methods. Herein, structurally stable ultrathin (1–3 layers) in-plane 1T-2H MoS₂ heterostructures have been rationally modulated and coaxially aligned on three-dimensional carbon nanofibers (MoS₂/CF) through a facile hydrothermal approach for supercapacitors and electrocatalysis. Benefiting from the unique heterostructure, the MoS₂/CF composite shows amazing stability with no obvious change after being stored in air for over 36 months. In addition, it presents high specific capacitance of 310 F g⁻¹ and remarkable rate capability of 78% at 100 mV s⁻¹. The fabricated asymmetric supercapacitor delivers an impressive energy density of 81.4 Wh kg^{−‍‍‍‍‍1} in 1 M Na₂SO₄ solution attributed to the high specific capacitance and large operating voltage range of 2 V. Moreover, the MoS₂/CF composite also demonstrates enhanced electrocatalytic activity for hydrogen evolution reaction with a low overpotential of 194 mV at 10 mA cm⁻². The work may promote the developments of high-performance bifunctional energy conversion and storage systems in future.

金属1T MoS ₂由于其固有的优异电导率和高电化学活性，因此是超级电容器的有希望的阳极候选材料。但是，它非常不稳定，很难通过常规方法进行大规模合成。在这里，结构上稳定的超薄（1-3层）面内1T-2H MoS ₂异质结构已经通过超级电容器和电催化的便捷水热方法在三维碳纳米纤维（MoS ₂ / CF）上进行了合理的调制和同轴排列。得益于独特的异质结构，MoS ₂/ CF复合材料在空气中存放超过36个月后显示出惊人的稳定性，没有明显变化。此外，它在310 m g s ^-1时具有310 F g ^-1的高比电容和78％的显着倍率能力。制成的非对称超级电容器在1 M Na ₂ SO ₄解决方案中提供了令人印象深刻的81.4 Wh kg ⁻¹能量密度，这归因于高比电容和2 V的大工作电压范围。此外，MoS ₂ / CF复合材料还显示出增强的电催化性能10 mA cm ^-2时低过电势194 mV的氢气析出反应的活性。这项工作可能会促进未来高性能双功能能量转换和存储系统的发展。