Stabilized TiN Nanowire Arrays for High-Performance and Flexible Supercapacitors

被引：632

作者：

Lu, Xihong ^{[1
,2
]}

Wang, Gongming ^{[2
]}

Zhai, Teng ^{[1
]}

Yu, Minghao ^{[1
]}

Xie, Shilei ^{[1
]}

Ling, Yichuan ^{[2
]}

Liang, Chaolun ^{[3
]}

Tong, Yexiang ^{[1
]}

Li, Yat ^{[2
]}

机构：

[1] Sun Yat Sen Univ, Sch Chem & Chem Engn, KLGHEI Environm & Energy Chem, MOE,Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China

[2] Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA

[3] Sun Yat Sen Univ, Instrumental Anal & Res Ctr, Guangzhou 510275, Guangdong, Peoples R China

来源：

NANO LETTERS | 2012年 / 12卷 / 10期

基金：

美国国家科学基金会;

关键词：

Solid-state supercapacitors; flexible; TiN nanowires; polymer electrolyte; SOLID-STATE SUPERCAPACITORS; CARBON; FABRICATION; NANORODS;

D O I：

10.1021/nl302761z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：5376 / 5381

页数：6

共 37 条

[1]

[Anonymous], 1995, Handbook of X-ray Photoelectron Spectroscopy. A Reference Book of Standard Spectra for Identification and Interpretation of XPS Data

[2] Nanostructured materials for advanced energy conversion and storage devices [J].