| Autor: |
Choi, Inyoung, Lim, Jinhyuk, Reis, Roberto dos, Kim, Eunji, Lim, Soo Yeon, Dravid, Vinayak P., Kim, Heejin, Oh, Keun-Hwan, Nam, Kwan Woo |
| Zdroj: |
Journal of Materials Chemistry A; 10/14/2023, Vol. 11 Issue 38, p20583-20591, 9p |
| Abstrakt: |
Proton (H+)-exchange membrane fuel cells (PEMFCs) are considered effective power sources for fuel cell electric vehicles because of their clean emission, air-purification capability, and excellent durability. However, the performance degradation at low relative humidity (RH) remained to be addressed. Water back-diffusion, which refers to the diffusion of water from the cathode to the membrane by a concentration gradient, could lead to a remarkable improvement in the H+ conductivity of membrane/electrode assemblies (MEAs) at low RH. This effect can be achieved by introducing a functional material with a high water content into the cathode catalyst layer. Herein, we propose a Zr-based metal–organic framework (MOF; UiO-66(Zr)-(COOH)2) as a water-rich additive material in the MEA and demonstrate that it increases the power performance of PEMFCs at low RH by promoting water back-diffusion. The high compositional and structural tunability of MOFs will expand the pool of materials to adjust the humidity level of PEMFCs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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