School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, P. R. China.
Nanoscale. 2019 Nov 28;11(46):22255-22260. doi: 10.1039/c9nr07564j.
Layered transition-metal dichalcogenides based on VIB elements have attracted substantial attention for their applications in energy storage and conversion. However, few studies have concentrated on VB element dichalcogenides. Herein, we report that trifunctional 2H-TaS2 nanoflakes exhibit high performance when applied in supercapacitors, hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). Notably, TaS2 nanoflakes delivered a large volumetric capacitance (502 F cm-3 at the scan rate of 10 mV s-1) and remarkable cycling stability (over 91% after 5000 cycles). TaS2 nanoflakes also exhibited remarkable catalytic performances in HER and OER processes, showing very small overpotentials and Tafel slopes, which are far better than those of the previously reported TaS2 electrocatalysts. Furthermore, TaS2 is highly stable in both alkaline and acidic electrolyte solutions. This work offers a new concept to design VB element-based electrodes for future energy storage and conversion applications.
基于 VIB 元素的层状过渡金属二卤化物因其在能量存储和转换中的应用而引起了广泛关注。然而，很少有研究集中在 VB 族元素的二卤化物上。在此，我们报告三功能 2H-TaS2 纳米薄片在超级电容器、析氢反应 (HER) 和析氧反应 (OER) 中表现出优异的性能。值得注意的是，TaS2 纳米薄片在 10 mV s-1 的扫描速率下提供了大的体积电容 (502 F cm-3) 和优异的循环稳定性 (5000 次循环后超过 91%)。TaS2 纳米薄片在 HER 和 OER 过程中也表现出优异的催化性能，具有非常小的过电势和 Tafel 斜率，远优于先前报道的 TaS2 电催化剂。此外，TaS2 在碱性和酸性电解质溶液中均高度稳定。这项工作为设计未来用于能量存储和转换应用的 VB 族元素基电极提供了新的概念。
