Chen Fu-Sen, Sakthivel Mani, Jin Zhi-Xiang, Lin Lu-Yin, Ho Kuo-Chuan
Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei 10608, Taiwan.
J Colloid Interface Sci. 2025 Jan 15;678(Pt C):1022-1035. doi: 10.1016/j.jcis.2024.09.193. Epub 2024 Sep 24.
Transition metal borides (TMBs) with high theoretical capacitances and excellent electronic properties have attracted much attention as a promising active material of supercapacitors (SCs). However, TMB nanoparticles are prone to conduct self-aggregation, which significantly deteriorates the electrochemical performance and structural stability. To address the severe self-aggregation in TMBs and improve the active material utilization, it is imperative to provide a conductive substrate that promotes the dispersion of TMB during growths. In this work, sheet-like nickel cobalt boride (NCB) was grown on molybdenum disulfide (MoS) hollow spheres (H-MoS) by using simple template growth and chemical reduction methods. The resultant NCB/H-MoS-50 was observed with uniform NCB nanosheets structure on the surface of the H-MoS and stronger MB bonding. After optimizing the loading amount of H-MoS, the optimal composite (NCB/H-MoS-50) modified nickel foam (NF) exhibits a superior specific capacity (1302 C/g) than that of the NCB electrode (957 C/g) at 1 A/g. Excellent rate capability of 84.8% (1104 C/g at 40 A/g) is also achieved by the NCB/H-MoS-50 electrode. The extraordinary electrochemical performance of NCB/H-MoS-50 is credited to the unique nanosheet-covered hollow spheres structure for facilitating ion diffusion and versatile charge storage mechanisms from the pseudocapacitive behavior of H-MoS and the Faradaic redox behavior of NCB. Furthermore, a hybrid SC is assembled with NCB/H-MoS-50 and activated carbon (AC) electrodes (NCB/H-MoS-50//AC), which operates in a potential window up to 1.7 V and delivers a high energy density of 76.8 W h kg at a power density of 850 W kg. A distinguished cycling stability of 93.2% over 20,000 cycles is also obtained for NCB/H-MoS-50//AC. These findings disclose the significant potential of NCB/H-MoS-50 as a highly performed battery-type material of SCs.
具有高理论电容和优异电子性能的过渡金属硼化物（TMBs）作为超级电容器（SCs）一种很有前景的活性材料，已引起了广泛关注。然而，TMB纳米颗粒易于发生自聚集，这显著降低了其电化学性能和结构稳定性。为了解决TMBs中严重的自聚集问题并提高活性材料的利用率，必须提供一种在生长过程中促进TMB分散的导电基底。在这项工作中，通过简单的模板生长和化学还原方法，在二硫化钼（MoS）空心球（H-MoS）上生长出了片状的镍钴硼化物（NCB）。观察到所得的NCB/H-MoS-50在H-MoS表面具有均匀的NCB纳米片结构以及更强的MB键合。在优化了H-MoS的负载量后，优化后的复合材料（NCB/H-MoS-50）修饰的泡沫镍（NF）在1 A/g电流密度下表现出比NCB电极（957 C/g）更高的比容量（1302 C/g）。NCB/H-MoS-50电极还实现了84.8%的优异倍率性能（在40 A/g电流密度下为1104 C/g）。NCB/H-MoS-50优异的电化学性能归因于其独特的纳米片覆盖空心球结构，该结构有利于离子扩散以及来自H-MoS的赝电容行为和NCB的法拉第氧化还原行为的多种电荷存储机制。此外，用NCB/H-MoS-50和活性炭（AC）电极组装了一种混合超级电容器（NCB/H-MoS-50//AC），其在高达1.7 V的电位窗口下工作，在850 W/kg的功率密度下具有76.8 W h/kg的高能量密度。NCB/H-MoS-50//AC在20000次循环中还获得了93.2%的出色循环稳定性。这些发现揭示了NCB/H-MoS-50作为SCs高性能电池型材料的巨大潜力。
