Back to Search
Start Over
Zr-MOF-Enabled Controllable Ion Sieving and Proton Conductivity in Flow Battery Membrane.
- Source :
-
Advanced Functional Materials . 10/14/2021, Vol. 31 Issue 42, p1-9. 9p. - Publication Year :
- 2021
-
Abstract
- Membrane with ordered channels is the key to controlling ion sieving and proton conductivity in flow batteries. However, it remains a great challenge for finely controlling the nanochannels of polymeric membranes. Herein, two types of acid-stable Zr-metal organic framework (MOF-801 and MOF- 808) with variable pore structures and channel properties are introduced as fillers into a non-fluorinated sulfonated poly (ether ether ketone) (SPEEK). The membrane incorporated with MOF-801 of a smaller triangular window (≈3.5 Å) successfully translates the molecular sieving property into the flow battery membrane, resulting in enhanced coulombic efficiency (98.5-99.2%) at 40-120 mA cm-2 compared with the pristine SPEEK membrane (97.1-98.5%). In contrast, more protophilic internal interconnected channels of MOF-808 yield faster proton highway, leading to a significant increase of voltage efficiency (93.7-84.1%) at 40-120 mA cm-2 compared with the pristine SPEEK membrane (91.7-78.9%). By regulating the ion sieving and proton conductivity, MOF-801/MOF-808 binary composite membrane exhibits synchronously improved performance in the vanadium redox flow battery system. The revealed structure -- property relationship in the Zr-MOFs-based membranes provides a general guideline to design new proton exchange membranes with ordered channels for flow battery application. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PROTON conductivity
*FLOW batteries
*SIEVES
*IONS
*DIRECT methanol fuel cells
Subjects
Details
- Language :
- English
- ISSN :
- 1616301X
- Volume :
- 31
- Issue :
- 42
- Database :
- Academic Search Index
- Journal :
- Advanced Functional Materials
- Publication Type :
- Academic Journal
- Accession number :
- 153746893
- Full Text :
- https://doi.org/10.1002/adfm.202104629