title: Hydrothermally formed three-dimensional nanoporous Ni(OH)2 thin-film supercapacitors.
abstract: A three-dimensional nanoporous Ni(OH)2 thin-film was hydrothermally converted from an anodically formed porous layer of nickel fluoride/oxide. The nanoporous Ni(OH)2 thin-films can be used as additive-free electrodes for energy storage. The nanoporous layer delivers a high capacitance of 1765 F g(-1) under three electrode testing. After assembly with porous activated carbon in asymmetric supercapacitor configurations, the devices deliver superior supercapacitive performances with capacitance of 192 F g(-1), energy density of 68 Wh kg(-1), and power density of 44 kW kg(-1). The wide working potential window (up to 1.6 V in 6 M aq KOH) and stable cyclability (∼90% capacitance retention over 10,000 cycles) make the thin-film ideal for practical supercapacitor devices.
authors.affiliation: Department of Chemistry, ‡Smalley Institute for Nanoscale Science and Technology, and §Department of Materials Science and NanoEngineering, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.forename: Gedeng
authors.initials: G
authors.lastname: Ruan
authors.forename: Huilong
authors.initials: H
authors.lastname: Fei
authors.forename: Changsheng
authors.initials: C
authors.lastname: Xiang
authors.forename: Xiujun
authors.initials: X
authors.lastname: Fan
authors.forename: James M
authors.initials: JM
authors.lastname: Tour
keywords: hydrothermal treatment; nanoporous; nickel hydroxide; supercapacitors; thin-film