A facile fabrication of 1D/2D nanohybrids composed of NiCo-hydroxide nanowires and reduced graphene oxide for high-performance asymmetric supercapacitors†,Inorganic Chemistry Frontiers

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A facile fabrication of 1D/2D nanohybrids composed of NiCo-hydroxide nanowires and reduced graphene oxide for high-performance asymmetric supercapacitors†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2019-10-21 , DOI: 10.1039/c9qi00681h
Xu Zhang _{1,

2,

3,

4,

5} , Qiuyu Fan _{1,

2,

3,

4,

5} , Siyu Liu _{5,

6,

7,

8} , Ning Qu _{1,

2,

3,

4,

5} , He Yang _{1,

2,

3,

4,

5} , Man Wang _{5,

6,

7,

8} , Juan Yang _{5,

6,

7,

8}

Affiliation

A novel 1D/2D hybrid design is reported for synthesizing a high performance NiCo-hydroxide nanowires/reduced graphene oxide (NiCo-NWs/G) composite. The oxygen-containing groups on the graphene oxide surface can act as anchoring sites for uniformly adsorbing the metal seeds, leading to the dispersed formation of thin NiCo-NWs on the graphene surface. The existence of graphene in NiCo-NWs/G can provide a conductive network to boost the faradaic reactions. In addition, the bimetallic NiCo-NWs possess rich redox reaction sites and the thin nanowire structure ensures that electrons can move rapidly from the reaction sites to the current collectors. Owing to the synergic effects of 1D NiCo-NWs and 2D graphene, the developed NiCo-NWs/G electrode exhibits an excellent performance of 1449 F g⁻¹ at a current density of 1 A g⁻¹, a high rate capability of 61% at 20 A g⁻¹, and a good cycling stability in 6 M KOH electrolyte. Moreover, the asymmetric supercapacitor with NiCo-NWs/G as a positive electrode and active carbon as a negative electrode delivers a high energy density of 42.1 W h kg⁻¹ at a power density of 0.8 kW kg⁻¹. This work may pave a promising new way for the development of 1D/2D composites based on pseudocapacitive hydroxides and carbon materials for high-performance asymmetric supercapacitors.

中文翻译：

由NiCo-氢氧化物纳米线和还原的氧化石墨烯组成的1D / 2D纳米杂化物的简便制造，用于高性能不对称超级电容器†

报道了一种新颖的1D / 2D混合设计，用于合成高性能的NiCo-氢氧化物纳米线/氧化石墨烯（NiCo-NWs / G）复合材料。氧化石墨烯表面上的含氧基团可以充当固定位点，以均匀地吸附金属晶种，从而导致在石墨烯表面上分散形成稀薄的NiCo-NWs。NiCo-NWs / G中石墨烯的存在可以提供导电网络以促进法拉第反应。此外，双金属NiCo-NW具有丰富的氧化还原反应位点，并且细的纳米线结构确保电子可以从反应位点快速移动到集电器。由于一维NiCo-NWs和二维石墨烯的协同作用，开发的NiCo-NWs / G电极表现出出色的性能，达到1449 F g ^-1在1 A g ^-1的电流密度下，在20 A g ^-1时具有61％的高倍率能力，并且在6 M KOH电解质中具有良好的循环稳定性。另外，以NiCo-NWs / G为正极，活性炭为负极的非对称超级电容器以0.8kW kg ^-1的功率密度提供了42.1W h kg ^-1的高能量密度。这项工作可能为开发基于伪电容性氢氧化物和碳材料的1D / 2D复合材料铺平一种有希望的新方法，以用于高性能不对称超级电容器。

更新日期：2019-12-18

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