Hydrothermally formed three-dimensional nanoporous Ni(OH)2 thin-film supercapacitors

Yang Yang; Lei Li; Gedeng Ruan; Huilong Fei; Changsheng Xiang; Xiujun Fan; James M Tour

doi:10.1021/nn5040197

Hydrothermally formed three-dimensional nanoporous Ni(OH)2 thin-film supercapacitors

ACS Nano. 2014 Sep 23;8(9):9622-8. doi: 10.1021/nn5040197. Epub 2014 Sep 11.

Authors

Yang Yang¹, Lei Li, Gedeng Ruan, Huilong Fei, Changsheng Xiang, Xiujun Fan, James M Tour

Affiliation

¹ 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.

PMID: 25198148
DOI: 10.1021/nn5040197

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.

Keywords: hydrothermal treatment; nanoporous; nickel hydroxide; supercapacitors; thin-film.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.