title: Stabilized TiN nanowire arrays for high-performance and flexible supercapacitors.
abstract: Metal nitrides have received increasing attention as electrode materials for high-performance supercapacitors (SCs). However, most of them are suffered from poor cycling stability. Here we use TiN as an example to elucidate the mechanism causing the capacitance loss. X-ray photoelectron spectroscopy analyses revealed that the instability is due to the irreversible electrochemical oxidation of TiN during the charging/discharging process. Significantly, we demonstrate for the first time that TiN can be stabilized without sacrificing its electrochemical performance by using poly(vinyl alcohol) (PVA)/KOH gel as the electrolyte. The polymer electrolyte suppresses the oxidation reaction on electrode surface. Electrochemical studies showed that the TiN solid-state SCs exhibit extraordinary stability up to 15,000 cycles and achieved a high volumetric energy density of 0.05 mWh/cm(3). The capability of effectively stabilizing nitride materials could open up new opportunities in developing high-performance and flexible SCs.
authors.affiliation: KLGHEI of Environment and Energy Chemistry, MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, People's Republic of China.
authors.forename: Xihong
authors.initials: X
authors.lastname: Lu
authors.forename: Gongming
authors.initials: G
authors.lastname: Wang
authors.forename: Teng
authors.initials: T
authors.lastname: Zhai
authors.forename: Minghao
authors.initials: M
authors.lastname: Yu
authors.forename: Shilei
authors.initials: S
authors.lastname: Xie
authors.forename: Yichuan
authors.initials: Y
authors.lastname: Ling
authors.forename: Chaolun
authors.initials: C
authors.lastname: Liang
authors.forename: Yexiang
authors.initials: Y
authors.lastname: Tong
authors.forename: Yat
authors.initials: Y
authors.lastname: Li