title: All-Solid-State High-Energy Asymmetric Supercapacitors Enabled by Three-Dimensional Mixed-Valent MnOx Nanospike and Graphene Electrodes.
abstract: Three-dimensional (3D) nanostructures enable high-energy storage devices. Here we report a 3D manganese oxide nanospike (NSP) array electrode fabricated by anodization and subsequent electrodeposition. All-solid-state asymmetric supercapacitors were assembled with the 3D Al@Ni@MnOx NSP as the positive electrode, chemically converted graphene (CCG) as the negative electrode, and Na2SO4/poly(vinyl alcohol) (PVA) as the polymer gel electrolyte. Taking advantage of the different potential windows of Al@Ni@MnOx NSP and CCG electrodes, the asymmetric supercapacitor showed an ideal capacitive behavior with a cell voltage up to 1.8 V, capable of lighting up a red LED indicator (nominal voltage of 1.8 V). The device could deliver an energy density of 23.02 W h kg(-1) at a current density of 1 A g(-1). It could also preserve 96.3% of its initial capacitance at a current density of 2 A g(-1) after 10000 charging/discharging cycles. The remarkable performance is attributed to the unique 3D NSP array structure that could play an important role in increasing the effective electrode surface area, facilitating electrolyte permeation, and shortening the electron pathway in the active materials.
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.|Department of Physics, Institute of Low-Dimensional Carbons and Device Physics, Shanghai University , Shanghai 200444, China .
authors.forename: Jie
authors.initials: J
authors.lastname: Yang
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.|School of Chemistry and Environment, South China Normal University , Guangzhou 510006, China.
authors.forename: Guizhu
authors.initials: G
authors.lastname: Li
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.
authors.forename: Zhenghui
authors.initials: Z
authors.lastname: Pan
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.
authors.forename: Meinan
authors.initials: M
authors.lastname: Liu
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Hou
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Xu
authors.affiliation: School of Chemistry and Environment, South China Normal University , Guangzhou 510006, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Deng
authors.affiliation: Department of Physics, Institute of Low-Dimensional Carbons and Device Physics, Shanghai University , Shanghai 200444, China .
authors.forename: Leimei
authors.initials: L
authors.lastname: Sheng
authors.affiliation: Department of Physics, Institute of Low-Dimensional Carbons and Device Physics, Shanghai University , Shanghai 200444, China .
authors.forename: Xinluo
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States.|Department of Physics, Tsinghua University , Beijing 100084, China.
authors.forename: Yongcai
authors.initials: Y
authors.lastname: Qiu
authors.affiliation: i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Science , Suzhou 215123, China.|Department of Physics, Tsinghua University , Beijing 100084, China.
authors.forename: Yuegang
authors.initials: Y
authors.lastname: Zhang
keywords: MnOx nanospike; all-solid-state; asymmetric supercapacitors; chemically converted graphene; three-dimensional