State Key Lab of Oil and Gas Reservoir Geology & Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, PR China.
State Key Lab of Oil and Gas Reservoir Geology & Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; School of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, PR China.
J Colloid Interface Sci. 2019 Apr 15;542:15-22. doi: 10.1016/j.jcis.2019.01.114. Epub 2019 Jan 28.
Nickel-cobalt double hydroxides (Ni-Co DHs) combined with cost-effectively commercial expanded graphite (EG) was prepared via a facile in-situ electrodeposition in mixed solvents of N,N-dimethylformamide and water. By simply adjust molar ratios of Ni/Co, a Ni-Co DHs/EG electrode in which Ni-Co DHs showing a porous-nanorod microstructure was fabricated. Thanks to synergistic effects between Ni(OH) and Co(OH) as well as the unique morphology of porous nanorods, an optimal Ni-Co DHs/EG electrode with a total mass loading of 4.0 mg cm can deliver a specific capacitance of 1246 F g at 1 A g, a rate capability of 91.8% as the discharging current density increasing from 1 to 10 A g, and a capacitance retention of 80.1% after 1000 cycles charged/discharged at 10 A g. Thus we can draw a conclusion that the Ni-Co DHs/EG electrode possesses a satisfactory specific capacitance, extremely superior rate performance, and good cycle stability, therefore it can be very competitive for practical applications in supercapacitors.
镍钴双氢氧化物（Ni-Co DHs）与经济高效的商业膨胀石墨（EG）结合，通过在 N，N-二甲基甲酰胺和水的混合溶剂中进行简便的原位电沉积来制备。通过简单调整 Ni/Co 的摩尔比，可以制备出 Ni-Co DHs 呈现多孔纳米棒微观结构的 Ni-Co DHs/EG 电极。由于 Ni(OH) 和 Co(OH) 之间的协同效应以及多孔纳米棒的独特形态，具有总质量负载为 4.0 mg cm 的最佳 Ni-Co DHs/EG 电极在 1 A g 时可提供 1246 F g 的比电容，当放电电流密度从 1 增加到 10 A g 时，具有 91.8%的倍率性能，在 10 A g 下充放电 1000 次后电容保持率为 80.1%。因此，我们可以得出结论，Ni-Co DHs/EG 电极具有令人满意的比电容、极高的倍率性能和良好的循环稳定性，因此在超级电容器的实际应用中极具竞争力。
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