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Designed synthesis of NiCo-LDH and derived sulfide on heteroatoms doping edge-enriched 3D rivet graphene films for high-performance asymmetric supercapacitor and efficient OER

Abstract

Nowadays, robustly coupling electroactive inorganics with bicontinuous graphene-based films is highly desirable for high-performance energy storage devices and electrocatalysts. Herein, free-standing heteroatoms doping edge-enriched 3D rivet graphene (H-3DRG) film with high flexibility and conductivity was obtained as the substrate to deposit vertically arranged NiCo-layered double hydroxide (NiCo-LDH) nanoneedles via hydrothermal approach and hierarchical NiCo2S4 nanostructures by further in-situ anion exchange process without destroying the original vertical architecture. The carbon nanoparticles located onto the surface of bicontinuous 3D porous graphene show gradient and edge-enriched structure, which can provide much more nucleation sites and better attached with electroactive inorganics than traditional 3D porous graphene films with interconnected carbon layers prepared by CVD process. Such outstanding structural advantages accelerate the reaction kinetics and enhance electrochemical activities which make the H-3DRG@NiCo-LDH and H-3DRG@NiCo2S4 based asymmetric supercapacitors devices both show high energy densities of 78.8 Wh/kg and 75.1 Wh/kg based on the entire devices, respectively. Furthermore, the above hybrids are also exactly in favor of OER process, which deliver a mass oxygen production current density of 10 mA/ cm2 at the low overpotentials of 289 and 264 mV in 1 M KOH, respectively.

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Publication details

The article was received on 25 Feb 2018, accepted on 10 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA01832D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Designed synthesis of NiCo-LDH and derived sulfide on heteroatoms doping edge-enriched 3D rivet graphene films for high-performance asymmetric supercapacitor and efficient OER

    K. Qin, L. Wang, S. Wen, L. Diao, P. Liu, J. Li, L. Ma, C. Shi, C. Zhong, W. Hu, E. Liu and N. Zhao, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA01832D

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