Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China.
Nanotechnology. 2017 Aug 4;28(31):315403. doi: 10.1088/1361-6528/aa7ab9. Epub 2017 Jun 21.
Strongly coupled boron and nitrogen co-doped graphene (BN-G) hybrids with nickel cobaltite (NiCoO) nanosheets (NCO/BN-G) were fabricated by a facile soft-chemical method for asymmetric supercapacitors with high-performance. The strong interaction between BN-G and NiCoO nanosheets are explored by various techniques. The effect of heteroatom doping on electrochemical properties of the hybrids is systematically investigated. The strong synergistic effect between NiCoO and BN-G leads to a specific capacitance of 106.5 mA h g at the current density of 0.5 A g and capacitance retention of 96.8% after 10 000 cycles at 5 A g, much better than those of the pure NiCoO and its hybrid with N-doped graphene. Moreover, an asymmetric supercapacitor device, assembled with NCO/BN-G and activated carbon (NCO/BN-G//AC), exhibits a maximum energy density of 45.6 Wh kg and an excellent cycling stability. The improved electrochemical performance of the NCO/BN-G hybrid is attributed to the good conductivity of BN-G and the synergistic effect between NiCoO nanosheets and BN-G combined together through a plane-to-plane contact mode.
通过简便的软化学方法制备了强耦合硼和氮共掺杂石墨烯（BN-G）与镍钴氧化物（NiCoO）纳米片（NCO/BN-G）杂化材料，用于高性能不对称超级电容器。通过各种技术探索了 BN-G 和 NiCoO 纳米片之间的强相互作用。系统研究了杂原子掺杂对杂化物电化学性能的影响。NiCoO 和 BN-G 之间的强协同效应导致在 0.5 A g 的电流密度下具有 106.5 mA h g 的比电容，在 5 A g 下 10 000 次循环后电容保持率为 96.8%，优于纯 NiCoO 及其与 N 掺杂石墨烯的杂化物。此外，由 NCO/BN-G 和活性炭（NCO/BN-G//AC）组装的非对称超级电容器装置表现出 45.6 Wh kg 的最大能量密度和优异的循环稳定性。NCO/BN-G 杂化物电化学性能的提高归因于 BN-G 的良好导电性以及 NiCoO 纳米片和 BN-G 之间的协同效应，它们通过面-面接触模式结合在一起。
