期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 44, 页码 38209-38216出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b12846
关键词
metal-organic frameworks; proton conductivity; synergistic effect; proton exchange membranes
资金
- National Natural Science Foundation of China [21501046, 21671175, 21371153]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [164100510005]
Metal-organic frameworks (MOFs) embedded in polymer have showed efficiency in improving proton conduction of hybrid membranes under hydrated conditions. However, anhydrous proton conduction of such hybrid membranes over 100 degrees C remains great challenge. Here, proton conductive hybrid membranes combined acid group (-SO3H)- and basic group (-NH2)-modified isomorphous MOFs, namely UiO-66(SO3H) (abbreviated as A, the initial of acid) and UiO-66(NH2) (abbreviated as B, the initial of basic) and a low-cost polymer (chitosan, CS) were prepared. The proton conductivity of the optimum dual MOF-cofilled hybrid membranes (CS/A + B) reached 3.78 X 10(-3) S/cm at 120 degrees C and under anhydrous conditions, under which each component, that is MOF A, MOF B and CS, and single MOF-filled hybrid membranes (CS/A and CS/B) nearly lost proton conduction without exception, producing unprecedented results of one plus one more greater than two. The synergistic effects among UiO-66(SO3H), UiO-66(NH2), and CS on improving conductivity are also observed under hydrated conditions, the highest proton conductivity of CS/A + B reached 5.2 X 10(-2) S/cm, which is 1.86, compared to that of the pure CS membrane at 100 degrees C and 98% relative humidity. The anhydrous proton conductivity of CS/A + B over 100 degrees C is one of the highest for MOF-based hybrid membranes. MOFs and hybrid membranes were extensively characterized and the proton conductive mechanism was revealed. The achievements open a new avenue for MOF-based anhydrous proton conducting membranes and would advance the exploration of future application of these MOFs in fuel cells.
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