School of Basic Sciences, Indian Institute of Technology, Bhubaneswar, Odisha 751013, India.
Dalton Trans. 2019 Nov 19;48(45):16873-16881. doi: 10.1039/c9dt03150b.
The electrochemical performance for energy storage of three-dimensional (3D) self-supported heterogeneous NiSex cubic-orthorhombic nanocrystals grown by a facile one-step chemical vapour deposition (CVD) approach on Ni foam substrates has been explored. NiSex shows a high specific capacitance of 1333 F g-1 with ultra-high energy (105 W h kg-1) and power (54 kW kg-1) densities. Furthermore, by integrating the as-grown NiSex as the anode and reduced graphene oxide as the cathode, a hybrid supercapacitor (HSC) prototype with a coin cell configuration has been fabricated. The device shows better capacitance (40 F g-1) with high energy (22 W h kg-1) and power (5.8 kW kg-1) densities and robust cycling durability (∼88% capacitance retention after 10 000 repeated cycles). For practical reliability of the as-fabricated HSC, a red LED has been illuminated by connecting it with two charged coin cells. These outstanding performances of the HSC prove to be promising for applications in high energy storage systems.
通过简便的一步化学气相沉积 (CVD) 方法在 Ni 泡沫基底上生长的三维 (3D) 自支撑非均相 NiSex 立方-正交纳米晶体在储能方面的电化学性能已被探索。NiSex 表现出 1333 F g-1 的超高比电容，具有超高的能量 (105 W h kg-1) 和功率 (54 kW kg-1) 密度。此外，通过将生长的 NiSex 作为阳极，还原氧化石墨烯作为阴极，制备了具有硬币电池结构的混合超级电容器 (HSC) 原型。该器件具有更好的电容 (40 F g-1)、更高的能量 (22 W h kg-1) 和功率 (5.8 kW kg-1) 密度，以及稳健的循环耐久性 (在 10000 次重复循环后保持约 88%的电容)。为了验证所制备的 HSC 的实际可靠性，通过将其与两个充电的硬币电池连接，成功点亮了一个红色 LED。这些 HSC 的优异性能证明其有望应用于高储能系统。
