Low-temperature solution-processable Ni(OH)2 ultrathin nanosheet/N-graphene nanohybrids for high-performance supercapacitor electrodes
Low-temperature solution-processable Ni(OH)2 ultrathin nanosheet/N-graphene nanohybrids for high-performance supercapacitor electrodes
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DOI：
10.1039/c4nr00655k
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发表时间：
2014-06-07
期刊：
影响因子：
6.7
通讯作者：
Chen, Mingwei
中科院分区：
文献类型：
--
作者：
Chang, Haixin;Kang, Jianli;Chen, Mingwei
本文提出了一种新颖而简便的方法，利用低温溶液加工方法制备高氮掺杂石墨烯（n-石墨烯）基层状准二维纳米杂化体和超薄纳米片纳米晶体，用于高性能超级电容器电极。通过化学还原石墨烯的大规模残馀缺陷，可以在低温下实现高氮掺杂，同时也是化学还原石墨烯及其相关纳米杂化物中氧含量最低的一种。超薄Ni(OH)(2)纳米片纳米晶体/ n -石墨烯的层状准二维纳米杂化或异质结构可以应用于超级电容器电极，具有类似于1551 F g（-1）的超高电容，在扫描测量（从2 mV s（-1）到100 mV s(-1)）和放电测试（从1.5 A g（-1）到30 A g(-1)）中具有优异的速率性能，并且具有良好的循环稳定性。此外，Ni(OH)(2)纳米片/ n -石墨烯纳米复合物的电容分别比纯纳米晶体和纳米晶体/ n -石墨烯物理混合物高两个和一个数量级。基于纳米杂化材料的超级电容器电极的电子转移速度比纯纳米晶体电极快100倍以上，比纳米晶体/ n -石墨烯混合物电极快几十倍。这种低温方法可以为能源应用提供低成本、溶液可加工和易于扩展的高性能石墨烯纳米混合电极。
A novel and facile strategy is developed to fabricate highly nitrogen-doped graphene (N-graphene) based layered, quasi-two-dimensional nanohybrids with ultrathin nanosheet nanocrystats using a low-temperature, solution processing method for high-performance supercapacitor electrodes. High N doping can be achieved together with one of the lowest oxygen content in chemically reduced graphene and related nanohybrids at low temperature by large-scale residue defects of chemically reduced graphene. The layered, quasi-two-dimensional nanohybrids or heterostructures of ultrathin Ni(OH)(2) nanosheet nanocrystal/N-graphene can be applied in supercapacitor electrodes with ultrahigh capacitances of similar to 1551 F g(-1), excellent rate performance in the scan measurements (from 2 mV s(-1) to 100 mV s(-1)) and in the discharge tests (from 1.5 A g(-1) to 30 A g(-1)) and good cycling stability. Moreover, the capacitance of Ni(OH)(2) nanosheet/N-graphene nanohybrids is two and one orders of magnitude higher than that for pure nanocrystals and for the physical mixture of nanocrystal/N-graphene, respectively. Electron transfer in supercapacitor electrodes based on nanohybrids is over 100 times faster than that in electrodes from pure nanocrystals and several tens of times faster than that in electrodes from nanocrystal/N-graphene mixtures. This low-temperature method may provide a low-cost, solution-processable and easily scalable route to high-performance graphene nanohybrid electrodes for energy applications.