Details

Autor(en) / Beteiligte

• Huang, Xiaodong
• Zhang, Shuai
• Zhang, Yaping
• Zhang, Hongping
• Yang, Xuping

Titel

Sulfonated polyimide/chitosan composite membranes for a vanadium redox flow battery: influence of the sulfonation degree of the sulfonated polyimide

Ist Teil von

• Polymer journal, 2016-08, Vol.48 (8), p.905-918

Ort / Verlag

Tokyo: Nature Publishing Group

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We studied the relationship between the sulfonation degree (SD) of the sulfonated polyimide and the properties of sulfonated polyimide/chitosan (SPI/CS) composite membranes for application to a vanadium redox flow battery (VRFB). The SD of SPI was altered from 30 to 70%. The structure and morphology were characterized using attenuated total reflection Fourier transformed infrared spectroscopy (ATR-FTIR) and atomic force microscope, respectively. The physicochemical properties of membranes were also measured. The as-prepared SPI30/CS membrane had the lowest proton conductivity and negligible vanadium ion permeability. The VRFB performance of the SPI30/CS membrane was acceptable and stable at 10 mA cm-2 , but the charge-discharge process could not be completed at a higher current density, such as 20 and 30 mA cm-2 , because of its proton conductivity being too low. Although the SPI70/CS membrane had the highest proton conductivity (4.88 × 10-2 S cm-1 ), the coulombic efficiency (CE) of the VRFB containing SPI70/CS was the lowest because of its highest vanadium ion permeability (10.47 × 10-7 cm2 min-1 ). In particular, the VRFB assembled with the SPI40/CS membrane underwent 100 charge-discharge cycles at 50 mA cm-2 and exhibited good stability in CE (99.3%) and energy efficiency (EE) (70.5%). Both SPI40/CS and SPI50/CS membranes are potential candidates for VRFB applications because of their high proton selectivity, good chemical stability and excellent VRFB performance.