Freestanding hierarchical nickel molybdate@reduced graphene oxide@nickel aluminum layered double hydroxides nanoarrays assembled from well-aligned uniform nanosheets as binder-free electrode materials for high performance supercapacitors

Dongxuan Guo; Xiumei Song; Bonan Li; Lichao Tan; Huiyuan Ma; Haijun Pang; Xinming Wang; Lulu Zhang

doi:10.1016/j.jcis.2019.02.076

Freestanding hierarchical nickel molybdate@reduced graphene oxide@nickel aluminum layered double hydroxides nanoarrays assembled from well-aligned uniform nanosheets as binder-free electrode materials for high performance supercapacitors

J Colloid Interface Sci. 2019 May 15:544:46-52. doi: 10.1016/j.jcis.2019.02.076. Epub 2019 Feb 23.

Authors

Dongxuan Guo¹, Xiumei Song², Bonan Li¹, Lichao Tan³, Huiyuan Ma⁴, Haijun Pang¹, Xinming Wang¹, Lulu Zhang¹

Affiliations

¹ School of Materials Science and Engineering, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China.
² State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
³ School of Materials Science and Engineering, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China; Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China. Electronic address: tanlcking@163.com.
⁴ School of Materials Science and Engineering, College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150040, China. Electronic address: mahy017@163.com.

PMID: 30825800
DOI: 10.1016/j.jcis.2019.02.076

Abstract

Herein, the hierarchical nickel molybdate@reduced graphene oxide@nickel aluminum layered double hydroxides (NiMoO₄@rGO@NiAl-LDHs) architecture assembled from well-aligned nanosheets is successfully constructed on Ni-foam through a three-step strategy. For the first time, ultrathin graphene nanosheets are introduced by a novel spraying process to avoid the stack. NiAl-LDHs is prepared via situ growth procedure in which NiAl-LDH self-assembles on the surface of graphene to prevent graphene from aggregating, resulting in an enlarged specific surface area. Electrochemical analysis manifests that NiMoO₄@rGO@NiAl-LDHs yields exceptional specific capacitance (3396 Fg^-1 at 1 Ag^-1), favorable charge/discharge rate and approving long-term stability. Furthermore, the NiMoO₄@rGO@NiAl-LDHs//AC device delivers superior specific capacitance (137.2 Fg^-1 at 1 Ag^-1), high energy density (48.7 Whkg^-1) associated with pleasurable power output (7987 Wkg^-1). Importantly, the well-aligned NiMoO₄@rGO@NiAl-LDHs provides a prospective conception constructing hierarchical structural materials in the area of supercapacitor.

Keywords: Hierarchical; Nickel aluminum layered double hydroxides; Nickel molybdate; Reduced graphene oxide; Spraying.