Wang Tianlei, Liu Meitang, Ma Hongwen
Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China.
Nanomaterials (Basel). 2017 Jun 7;7(6):140. doi: 10.3390/nano7060140.
Supercapacitors have been one of the highest potential candidates for energy storage because of their significant advantages beyond rechargeable batteries in terms of large power density, short recharging time, and long cycle lifespan. In this work, Cu-Co sulfides with uniform flower-like structure have been successfully obtained via a traditional two-step hydrothermal method. The as-fabricated Cu-Co sulfide vulcanized from precursor (P-Cu-Co sulfide) is able to deliver superior specific capacitance of 592 F g at 1 A g and 518 F g at 10 A g which are surprisingly about 1.44 times and 2.39 times higher than those of Cu-Co oxide electrode, respectively. At the same time, excellent cycling stability of P-Cu-Co sulfide is indicated by 90.4% capacitance retention at high current density of 10 A g after 3000 cycles. Because of the introduction of sulfur during the vulcanization process, these new developed sulfides can get more flexible structure and larger reaction surface area, and will own richer redox reaction sites between the interfaces of active material/electrolyte. The uniform flower-like P-Cu-Co sulfide electrode materials will have more potential alternatives for oxides electrode materials in the future.
超级电容器因其在高功率密度、短充电时间和长循环寿命方面比可充电电池具有显著优势，一直是最具潜力的储能候选者之一。在这项工作中，通过传统的两步水热法成功制备了具有均匀花状结构的硫化铜钴。由前驱体硫化而成的硫化铜钴（P-Cu-Co硫化物）在1 A g时能够提供592 F g的优异比电容，在10 A g时为518 F g，分别比氧化亚铜钴电极高出约1.44倍和2.39倍，令人惊讶。同时，P-Cu-Co硫化物在10 A g的高电流密度下经过3000次循环后电容保持率为90.4%，表明其具有出色的循环稳定性。由于在硫化过程中引入了硫，这些新开发的硫化物可以获得更灵活的结构和更大的反应表面积，并且在活性材料/电解质界面之间将拥有更丰富的氧化还原反应位点。均匀的花状P-Cu-Co硫化物电极材料在未来将成为氧化物电极材料更具潜力的替代品。
