It is of great importance to design rationally combined metal-organic frameworks (MOFs) with multifunctional nano geometries to develop advanced energy storage devices. We devised a simple room-temperature boronization system to produce ultrathin Ni-ZIF/Ni-B nanosheets with plenty of crystalline-amorphous phase barriers. The Ni-ZIF/Ni-B-24 h nanoflakes electrodes exhibited a specific capacitance of 104.2F g with the cyclic stability of 94.5 % using the flaky architecture and inherent properties of the Ni-ZIF/Ni-B-24 h nanoflakes. Furthermore, an asymmetric supercapacitor made of Ni-ZIF/Ni-B-24 h and activated carbon had a high specific capacitance of 370.7F g at 1 A/g, and the energy density of 131.8 W h kg at a power density of 800 W kg. Intriguingly, Ni-ZIF/Ni-B-24 h nanoflakes have consistently delivered higher specific capacities because of the adequate electrochemical active sites and an increase in electron transfer rate during redox reactions.

中文翻译：

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设计时间依赖性 MOF 基硼化镍二维纳米结构作为储能应用的正极

设计合理组合的具有多功能纳米几何形状的金属有机框架（MOF）对于开发先进的储能器件具有重要意义。我们设计了一种简单的室温硼化系统来生产具有大量晶态-非晶相势垒的超薄 Ni-ZIF/Ni-B 纳米片。利用 Ni-ZIF/Ni-B-24 h 纳米片的片状结构和固有特性，Ni-ZIF/Ni-B-24 h 纳米片电极的比电容为 104.2F g，循环稳定性为 94.5%。此外，由Ni-ZIF/Ni-B-24 h和活性炭制成的非对称超级电容器在1 A/g下具有370.7F g的高比电容，在功率密度为800时的能量密度为131.8 W h kg。瓦公斤。有趣的是，由于充足的电化学活性位点和氧化还原反应过程中电子转移速率的增加，Ni-ZIF/Ni-B-24 h 纳米薄片始终具有更高的比容量。