Cobalt sulfide is favorable for supercapacitors, but its application is inhibited by the inherent slow charge transfer kinetics and poor stability in alkaline solution. Herein, zeolitic imidazole framework (ZIF)-derived Co₃S₄ nanoplate arrays (NPAs) decorated with CeO₂ nanoparticles (NPs) grown on Ni foam have been developed. The obtained Co₃S₄/CeO₂-NPAs display a 2D leaf-like nanoplate morphology (average thickness of nearly 230 nm) with a large amount of oxygen vacancies and exhibits remarkably boosted specific capacity/capacitance, i.e., 1155.8 C/g (2408 F/g) at 0.5 A/g with a notable rate capability (76.5% at 10 A/g), compared to Co₃S₄-NPAs or CeO₂ NPs. More importantly, a two-electrode cell comprising the Co₃S₄/CeO₂-NPAs and an activated carbon electrode displays a high energy density of 45.4 Wh/kg (at a power density of 850 W/kg) with decent long-term durability. Furthermore, a red light-emitting diode can be lighted up for 10 min by two charged cells, showing great prospect of Co₃S₄/CeO₂-NPAs. The outstanding electrochemical properties of the Co₃S₄/CeO₂-NPAs are mainly attributed to the 2D nanoplate morphology with much accessible active sites and the introduction of CeO₂ NPs. The Co₃S₄/CeO₂-rich interfaces promote electron transfer between Co₃S₄ and CeO₂. The abundant oxygen vacancies adhere to the surface of Co₃S₄ and can enhance the electronic conductivity and the capture of OH^–. In addition, the CeO₂ layer can protect the Co₃S₄-NPAs from corrosion by the KOH electrolyte during the electrochemical process. Therefore, the electrode developed by this work has great potential in electrochemical applications.

中文翻译：

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缺氧的CeO ₂纳米颗粒修饰的Co ₃ S ₄纳米板阵列，用于超级电容器应用

硫化钴对超级电容器是有利的，但其固有的缓慢的电荷转移动力学和在碱性溶液中的稳定性差，抑制了硫化钴的应用。在本文中，已经开发了由沸石咪唑骨架（ZIF）衍生的Co ₃ S ₄纳米板阵列（NPA），其装饰有在Ni泡沫上生长的CeO ₂纳米颗粒（NPs）。所得的Co ₃ S ₄ / CeO ₂ -NPA表现出具有大量氧空位的二维叶状纳米板形态（平均厚度接近230 nm），并且比容量/电容显着提高，即1155.8 C / g（与Co ₃ S ₄相比，在0.5 A / g时具有2408 F / g）的显着速率能力（在10 A / g时为76.5％）-NPA或CeO ₂ NP。更重要的是，由Co ₃ S ₄ / CeO ₂ -NPA和活性炭电极组成的双电极电池具有45.4 Wh / kg的高能量密度（在850 W / kg的功率密度下），并且长期具有良好的能效耐用性。此外，两个带电电池可将红色发光二极管点亮10分钟，显示出Co ₃ S ₄ / CeO ₂ -NPAs的广阔前景。Co ₃ S ₄ / CeO ₂ -NPA的出色电化学性能主要归因于具有易于访问的活性位点的2D纳米板形态和CeO ₂的引入NP。富Co ₃ S ₄ / CeO _2的界面促进了Co ₃ S ₄和CeO ₂之间的电子转移。丰富的氧空位坚持Co的表面₃小号₄，并且可以提高电子传导性和OH的捕获^- 。另外，在电化学过程中，CeO ₂层可以保护Co ₃ S ₄ -NPA免受KOH电解质的腐蚀。因此，通过这项工作开发的电极在电化学应用中具有巨大的潜力。