Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction
Fu, HH (Fu, Haihai)[ 1 ]; Liu, Y (Liu, Yi)[ 2 ]; Chen, L (Chen, Long)[ 1 ]; Shi, YL (Shi, Yulin)[ 1 ]; Kong, WW (Kong, Wenwen)[ 3 ]; Hou, J (Hou, Juan)[ 1 ]; Yu, F (Yu, Feng)[ 1 ]; Wei, TT (Wei, Tingting)[ 1 ]; Wang, H (Wang, Hao)[ 1 ]; Guo, XH (Guo, Xuhong)[ 1,4 ]
2019
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume296Issue:2Pages:719-729
Abstract

Spinel NiCo2O4 (NCO) as a promising electrode material, is essential for supercapacitors and electrocatalysts for oxygen evolution reaction (OER), which crucially related to its structure and morphology. Herein, hierarchical spinel NCO nanomaterials with different morphologies such as homogeneous NCO nanoparticles, one-dimensional NCO nanorods, heterogeneous NCO nanoflowers, and three-dimensional NCO microspheres assembled with nanoparticles are synthesized via facile coprecipitation method combined with calcination process. The effect of precipitating agents on designed formation mechanism of these NCO structures is further investigated. NCO microspheres are evaluated as supercapacitors and demonstrate excellent electrochemical performances with a high specific capacitance (225.07 C/g at 0.5 A/g) and cycling stability (86.9% at 2 A/g over 3000 cycles). Furthermore, the asymmetric supercapacitor is fabricated with NCO microspheres as the positive and graphene as the negative respectively, which exhibits a high energy density of 19.12 Wh/kg at a power density of 509.87 W/kg. As the electrocatalyst, NCO microspheres also show a superior OER electrocatalytic activity with a minimal Tafel slope of 70.32 mV dec(-1) due to more mesoporous and diffusion pathways than other NCO samples. These results provide a new strategy to develop affordable alternative OER catalysts and asymmetric supercapacitors.

KeywordNiCo2O4 Morphology Asymmetric supercapacitor Oxygen evolution reaction
DOI10.1016/j.electacta.2018.11.103
Indexed BySCI
WOS IDWOS:000454822400081
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/5646
Collection中国科学院特殊环境功能材料与器件重点试验室
Affiliation1.Shihezi Univ, Sch Chem & Chem Engn, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Shihezi 832003, Peoples R China
2.Tech Univ, Inst Chem, AG Elektrochem, D-09111 Chemnitz, Germany
3.Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Urumqi 830011, Peoples R China
4.East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China
Recommended Citation
GB/T 7714
Fu, HH ,Liu, Y ,Chen, L ,et al. Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction[J]. ELECTROCHIMICA ACTA,2019,296(2):719-729.
APA Fu, HH .,Liu, Y .,Chen, L .,Shi, YL .,Kong, WW .,...&Guo, XH .(2019).Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction.ELECTROCHIMICA ACTA,296(2),719-729.
MLA Fu, HH ,et al."Designed formation of NiCo2O4 with different morphologies self-assembled from nanoparticles for asymmetric supercapacitors and electrocatalysts for oxygen evolution reaction".ELECTROCHIMICA ACTA 296.2(2019):719-729.
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