Rabani Iqra, Hussain Sajjad, Vikraman Dhanasekaran, Seo Young-Soo, Jung Jongwan, Jana Atanu, Shrestha Nabeen K, Jalalah Mohammed, Noh Yong-Young, Patil Supriya A
Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neung dong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea.
Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul, 04620, Republic of Korea.
Dalton Trans. 2020 Oct 20;49(40):14191-14200. doi: 10.1039/d0dt02548h.
Direct growth of self-supported one-dimensional (1D) nanorod arrays on conducting substrates is highly attractive for electrocatalysis, due to their unique shape, size, and length. In this work, a facile and simple two-step method was employed to synthesize 1D-CoSe2 nanoarrays on titanium (Ti) foil via a wet chemical ion-exchange approach. The as-synthesized 1D-CoSe2 nanoarrays were directly used as electrode materials for hydrogen evolution reaction and supercapacitors. As an electrocatalyst, the optimized 1D-CoSe2(tex-48 h) nanoarray exhibits excellent hydrogen evolution properties with a small Tafel slope of 78 mV dec-1, low overpotentials of 41 mV@1 mA cm-2 and 216 mV@10 mA cm-2, and extended robust performance for 25 h. Moreover, for a symmetric device, it delivers a maximum specific capacitance of 152 F g-1 at 0.5 A g-1 and a better energy density of 21.1 W h kg-1 at a power density of 0.5 kW kg-1. Also, the symmetric device capacity retention behavior achieves ∼96.8% of the initial result after 5000 cycles, revealing the good stability of the electrode. Our findings offer a new way to further the development of high-performance energy devices.
由于其独特的形状、尺寸和长度，在导电基底上直接生长自支撑的一维（1D）纳米棒阵列对于电催化极具吸引力。在这项工作中，采用了一种简便的两步法，通过湿化学离子交换方法在钛（Ti）箔上合成1D-CoSe₂纳米阵列。所合成的1D-CoSe₂纳米阵列直接用作析氢反应和超级电容器的电极材料。作为一种电催化剂，优化后的1D-CoSe₂（tex-48 h）纳米阵列表现出优异的析氢性能，塔菲尔斜率小至78 mV dec⁻¹，在1 mA cm⁻²时过电位低至41 mV，在10 mA cm⁻²时为216 mV，并具有长达25小时的稳定性能。此外，对于对称器件，它在0.5 A g⁻¹时的最大比电容为152 F g⁻¹，在功率密度为0.5 kW kg⁻¹时的能量密度为21.1 W h kg⁻¹。而且，对称器件在5000次循环后的容量保持率达到初始结果的约96.8%，表明电极具有良好的稳定性。我们的研究结果为进一步开发高性能能源器件提供了一种新方法。
