Supercapacitor-battery hybrid energy storage devices from an aqueous nitroxide radical active material

• 来源期刊: 科学通报(英文版)
• 学科: 工学
• 年，卷（期）: 2011,（23）
• 页码范围: 2433-2436
• 页数: 4页
• 分类号: TM53|TM912
• 语种: 中文

摘要

A hybrid electrochemical energy storage device was fabricated in aqueous NaOH with the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) nitroxide radical as the active material, hydroquinone as the counter electrode active material, and an OH -selective separating membrane. The working principle of this device was investigated and it can be considered as a supercapacitor-battery hybrid energy storage system. Device performance was characterized by cyclic voltammetry and galvanostatic charge-discharge testing. When using multi-walled carbon nanotubes (MWCNTs) as electrode support materials, a high pseudo-capacitance of 1280 F g -1 was obtained with the TEMPO nitroxide radical as the active material at a 1 mV s -1 scan rate. This was ~33 times larger than the inherent double layer capacitance of MWCNTs. The electrode material and active material dissolved in solution could potentially be substituted with similar materials. This simple design provides a new approach for fabricating high performance supercapacitor-battery hybrid energy storage devices.