Abstract
Proton conductive materials are of significant importance and highly desired for clean energy-related applications. Discovery of practical metal-organic frameworks (MOFs) with high proton conduction remains a challenge due to the use of toxic chemicals, inconvenient ligand preparation and complication of production at scale for the state-of-the-art candidates. Herein, we report a zirconium-MOF, MIP-202(Zr), constructed from natural α-amino acid showing a high and steady proton conductivity of 0.011 S cm−1 at 363 K and under 95% relative humidity. This MOF features a cost-effective, green and scalable preparation with a very high space-time yield above 7000 kg m−3 day−1. It exhibits a good chemical stability under various conditions, including solutions of wide pH range and boiling water. Finally, a comprehensive molecular simulation was carried out to shed light on the proton conduction mechanism. All together these features make MIP-202(Zr) one of the most promising candidates to approach the commercial benchmark Nafion.
Highlights
2, Louisa Davis[2], Antoine Tissot[1], William Shepard[3, 4,5], Djemel Hamdane[6], Guillaume Maurin 2, Proton conductive materials are of significant importance and highly desired for clean energyrelated applications
The proton conductive performance is a critical factor for the Proton exchange membrane fuel cells (PEMFCs) materials and the current commercial benchmark for this application is Nafion[2]
In the field of proton conductive materials, the design of Zr-metal-organic frameworks (MOFs) based on non-commercially available linkers has been actively investigated, including a flexible tetraphosphonate coordination polymer[27], a Zr-phosphonate based on glyphosine[28,29], a phenolate-based MOF30, and PCMOF2031, outperforming in some cases Nafion
Summary
2, Louisa Davis[2], Antoine Tissot[1], William Shepard[3, 4,5], Djemel Hamdane[6], Guillaume Maurin 2, Proton conductive materials are of significant importance and highly desired for clean energyrelated applications. No example of hard metal cations, especially Al3+, Fe3+, or Zr4+, has been reported to form MOFs based on amino acids up to now, possibly due to the fast and strong bonding between high valence metal ions with aspartate in solution which leads highly complex the generation of crystalline products[24,25].
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