Proton Conduction of Nafion Hybrid Membranes Promoted by NH3-Modified Zn-MOF with Host–Guest Collaborative Hydrogen Bonds for H2/O2 Fuel Cell Applications
| Autor: | Hongfei Wang, Yujie Zhao, Zhichao Shao, Hongwei Hou, Wenjuan Xu, Qiong Wu, Xiaolin Ding |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Proton Proton exchange membrane fuel cell 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Membrane chemistry Chemical engineering Nafion Molecule General Materials Science Metal-organic framework 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 13:7485-7497 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | It is of great significance to develop creative proton exchange membrane materials for proton exchange membrane fuel cells (PEMFCs). The strategy of doping metal-organic frameworks (MOFs) with guest molecules into the Nafion matrix is adopted to improve the electrochemical performance of Nafion hybrid membranes. Various and abundant hydrogen bonds can make a tremendous contribution to the proton conduction of hybrid membranes. In this work, we used high proton-conducting Zn-MOFs with the characteristics of host-guest collaborative hydrogen bonds as the filler to prepare Zn-MOF/Nafion hybrid membranes. Alternating current (AC) impedance tests show that when the doping amount of Zn-MOF is 5%, the proton conductivity reaches 7.29 × 10-3 S·cm-1, being 1.87 times that of the pure Nafion membrane at 58% relative humidity (RH) and 80 °C. In an attempt to prove the promotion effect of guest NH3 on proton conductivity of Nafion hybrid membranes, Zn-MOF-NH3 was filled into the Nafion matrix. Under the same conditions, its proton conductivity reaches the maximum value of 2.13 × 10-2 S·cm-1, which is 5.47 times that of the pure Nafion membrane. Zn-MOF-NH3/Nafion-5 was used to fabricate a proton exchange membrane for application in H2/O2 fuel cells. The maximum power density of 212 mW cm-2 and a current density of 630 mA cm-2 reveal a respectable single cell performance. This study provides a promising method for optimizing the structure of MOF proton conductors and inspires the preparation of high-performance Nafion hybrid membranes. |
| Databáze: | OpenAIRE |
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