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Porous multishelled NiO hollow microspheres encapsulated within three-dimensional graphene as flexible free-standing electrodes for high-performance supercapacitors.
Nanoscale 2019; 11(34):16071-16079N

Abstract

Exploration of electrode materials with well-defined nanostructures and good flexibility is an efficient approach for achieving high-performance and flexible energy storage systems. However, it is still challenging to well integrate active materials into flexible electrodes and simultaneously maintain satisfactory electrochemical performance. Herein, we successfully synthesize novel three-dimensional graphene (3DG)-encapsulated porous multishelled NiO hollow microsphere (3DG/pMS-NiO) composite aerogels via a modified self-templating method and a dopamine (DA)-assisted self-assembly route. The well-designed highly interconnected porous 3DG network and the close contact NiO-graphene structure of the 3DG/pMS-NiO composite aerogels offer multiple advantages such as high porosity and accessible area, improved conductivity, enhanced electrolyte diffusion and a simple electrode preparation process. Thus, the as-prepared flexible 3DG/pMS-NiO electrodes showed significantly improved specific capacitance of 710.4 F g-1 at 0.5 A g-1 and excellent rate capability with an ultrahigh capacitance retention of 92.5% at 10 A g-1. In addition, the fabricated asymmetric supercapacitors (3DG/pMS-NiO//AC) showed a high specific capacitance of 34.4 F g-1 at 1 A g-1 with a voltage window of 0-1.6 V, a large energy density of 12.3 W h kg-1 at a power density of 815.3 W kg-1, and a decent cycling stability. This work profoundly enlightens the material design and electrode preparation, and even opens up an avenue for the development of high-performance and flexible energy storage systems.

Authors+Show Affiliations

College of Mathematics and Physics, Shanghai University of Electric Power, 2103 Pingliang Road, Shanghai 200090, China. yyzhu@shiep.edu.cn xiaojing_luo@163.com.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31432835

Citation

Zhang, Zhifang, et al. "Porous Multishelled NiO Hollow Microspheres Encapsulated Within Three-dimensional Graphene as Flexible Free-standing Electrodes for High-performance Supercapacitors." Nanoscale, vol. 11, no. 34, 2019, pp. 16071-16079.
Zhang Z, Su X, Zhu Y, et al. Porous multishelled NiO hollow microspheres encapsulated within three-dimensional graphene as flexible free-standing electrodes for high-performance supercapacitors. Nanoscale. 2019;11(34):16071-16079.
Zhang, Z., Su, X., Zhu, Y., Chen, Z., Fang, Z., & Luo, X. (2019). Porous multishelled NiO hollow microspheres encapsulated within three-dimensional graphene as flexible free-standing electrodes for high-performance supercapacitors. Nanoscale, 11(34), pp. 16071-16079. doi:10.1039/c9nr05117a.
Zhang Z, et al. Porous Multishelled NiO Hollow Microspheres Encapsulated Within Three-dimensional Graphene as Flexible Free-standing Electrodes for High-performance Supercapacitors. Nanoscale. 2019 Aug 29;11(34):16071-16079. PubMed PMID: 31432835.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Porous multishelled NiO hollow microspheres encapsulated within three-dimensional graphene as flexible free-standing electrodes for high-performance supercapacitors. AU - Zhang,Zhifang, AU - Su,Xiaorui, AU - Zhu,Yanyan, AU - Chen,Zhonghui, AU - Fang,Zebo, AU - Luo,Xiaojing, PY - 2019/8/23/pubmed PY - 2019/8/23/medline PY - 2019/8/22/entrez SP - 16071 EP - 16079 JF - Nanoscale JO - Nanoscale VL - 11 IS - 34 N2 - Exploration of electrode materials with well-defined nanostructures and good flexibility is an efficient approach for achieving high-performance and flexible energy storage systems. However, it is still challenging to well integrate active materials into flexible electrodes and simultaneously maintain satisfactory electrochemical performance. Herein, we successfully synthesize novel three-dimensional graphene (3DG)-encapsulated porous multishelled NiO hollow microsphere (3DG/pMS-NiO) composite aerogels via a modified self-templating method and a dopamine (DA)-assisted self-assembly route. The well-designed highly interconnected porous 3DG network and the close contact NiO-graphene structure of the 3DG/pMS-NiO composite aerogels offer multiple advantages such as high porosity and accessible area, improved conductivity, enhanced electrolyte diffusion and a simple electrode preparation process. Thus, the as-prepared flexible 3DG/pMS-NiO electrodes showed significantly improved specific capacitance of 710.4 F g-1 at 0.5 A g-1 and excellent rate capability with an ultrahigh capacitance retention of 92.5% at 10 A g-1. In addition, the fabricated asymmetric supercapacitors (3DG/pMS-NiO//AC) showed a high specific capacitance of 34.4 F g-1 at 1 A g-1 with a voltage window of 0-1.6 V, a large energy density of 12.3 W h kg-1 at a power density of 815.3 W kg-1, and a decent cycling stability. This work profoundly enlightens the material design and electrode preparation, and even opens up an avenue for the development of high-performance and flexible energy storage systems. SN - 2040-3372 UR - https://www.unboundmedicine.com/medline/citation/31432835/Porous_multishelled_NiO_hollow_microspheres_encapsulated_within_three_dimensional_graphene_as_flexible_free_standing_electrodes_for_high_performance_supercapacitors_ L2 - https://doi.org/10.1039/c9nr05117a DB - PRIME DP - Unbound Medicine ER -