One of the most promising cathode materials for supercapacitors is nickel-cobalt layered double hydroxide (NiCo-LDH). Doping atoms are widely used to solve the problems of poor electrical conductivity and structural defects of electrode materials. Vanadium (V) has received widespread attention due to its multiple oxidation states and low cost. In this article, we use one-step hydrothermal method to synthesize V-doped NiCo-LDH (V-NC1.5). By regulating the doping amount of V, 2V-NC1.5 exhibits superb specific capacitance of 1835 F g at 1 A g. An asymmetric aqueous supercapacitor was assembled with 2V-NC1.5 and activated carbon. Its maximum energy density can reach 60.9 Wh kg at 800 W kg of power density. When the two units are connected in series, they can effectively power a white LED bulb and maintain its brightness for more than 30 min. This result provides a potential opportunity for the efficient deployment of innovative energy storage technologies in the coming years.

中文翻译：

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简单制备V掺杂NiCo-LDH作为高能量密度超级电容器的阴极

最有前途的超级电容器阴极材料之一是镍钴层状双氢氧化物（NiCo-LDH）。掺杂原子广泛用于解决电极材料导电性差和结构缺陷的问题。钒(V)由于其多种氧化态和低成本而受到广泛关注。在本文中，我们采用一步水热法合成了V掺杂NiCo-LDH（V-NC1.5）。通过调节 V 的掺杂量，2V-NC1.5 在 1 A g 下表现出 1835 F g 的优异比电容。用2V-NC1.5和活性炭组装了不对称水性超级电容器。在功率密度为800 W kg时，其最大能量密度可达60.9 Wh kg。当两个单元串联时，它们可以有效地为白色LED灯泡供电并保持其亮度超过30分钟。这一结果为未来几年创新能源存储技术的有效部署提供了潜在的机会。