The rapid advancement of science and technology has led to the development of electronic devices that require higher energy storage capacities. Because of their greater energy as well as power density capabilities, hybrid supercapacitors offer an answer to the problems that result from the limitations of both supercapacitors and batteries when it comes to power densities and energy density. Borate ion-functionalized nickel manganese hydroxide nanoparticles (denoted as NiMnB) were prepared by a simple chemical reduction method, and novel complexes were obtained by growing NiMnB with a core-shell structure on reduced graphene oxide (rGO). The NiMnB inner core facilitates electron transport, while the borate/metal borate shell layer on the outer layer aids in OH absorption. Additionally, rGO integrates the dispersed nanoparticles, resulting in a comprehensive conductive system. This design optimizes the electrochemical performance of NiMn-based electrodes. The specific capacitance of the NiMnB/rGO-16 electrode was 916 F g when tested at a current density of 1 A g. NiMnB/rGO-16 was used as the positive electrode and activated carbon (AC) as the negative electrode assembled the hybrid supercapacitor. It showed strong cycling stability and an energy density of 50.2 Wh kg.

中文翻译：

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核壳NiMnB/rGO复合电极的制备及其在混合超级电容器中的应用

科学技术的快速进步导致了需要更高储能容量的电子设备的发展。由于其具有更大的能量和功率密度能力，混合超级电容器可以解决超级电容器和电池在功率密度和能量密度方面的局限性所导致的问题。通过简单的化学还原方法制备了硼酸根离子功能化的氢氧化镍锰纳米粒子（记为NiMnB），并通过在还原氧化石墨烯（rGO）上生长具有核壳结构的NiMnB获得了新型配合物。 NiMnB 内核有利于电子传输，而外层的硼酸盐/金属硼酸盐壳层有助于 OH 吸收。此外，rGO 整合了分散的纳米颗粒，形成了一个全面的导电系统。该设计优化了镍锰基电极的电化学性能。在1 A g的电流密度下测试时，NiMnB/rGO-16电极的比电容为916 F g。以NiMnB/rGO-16为正极，活性炭（AC）为负极组装了混合超级电容器。它表现出很强的循环稳定性，能量密度为50.2 Wh kg。