由次奈米通道有機金屬框架 UiO-66-NH2連續薄膜啟用的生物啟發式滲透能發電機

Abstract

開發具有超高離子選擇能力和電導度的連續薄膜對於收穫滲透能源扮演重要基礎角色，此滲透能源已經被視作一種新型態可永續發展之藍色清淨能源。啟發於電鰻發電細胞中之眾多生物離子通道，我製備了由次奈米通道金屬有機骨架（MOF）UiO-66-NH2與高度有序氧化鋁奈米通道（ANM）所組成之異質連續薄膜，實驗結果顯示此無缺陷之UiO-66-NH2@ANM薄膜 即使在高鹽濃度環境下， 即使在高鹽濃度環境下， 亦能展現超高離子選擇性與電導度，因此在混合海水河之 50倍離子 濃度梯條件下，此異質薄膜可輸出 濃度梯條件下，此異質薄膜可輸出 濃度梯條件下，此異質薄膜可輸出 4.79 W/m2之滲透能源功率密度，主因即是此薄膜所具有數量龐大的有次序的次奈米UiO-66-NH2與氧化鋁奈米通道。此外，更令人驚訝的是，本研究所開發出之異質次奈米通道薄膜針對不同離子具有高度選擇性，舉例而言針對Br－/ NO3－系統，選擇率更可高達1240倍，因此在100倍高鹽濃度差條件下，可輸出歷史新高之25.8 W/m2滲透能源功率密度。

The development of continuous membranes possessing ultrahigh ion selectivity as well as conductance plays a fundamental role for harvesting osmotic power, one type of blue energies and recognized as a sustainable and clean energy resource. Inspired from numerous biological ion channels on the electrocytes of electric eels, the heterogeneous subnanochannel membrane comprising a continuous metal organic framework (MOF) UiO-66-NH2 membrane (with window size of ~6-7 Å) and a highly ordered aluminum nanochannel membrane (ANM) has been fabricated. Results obtained indicate that the defect-free UiO-66-NH2@ANM membrane fabricated shows ultrahigh ion selectivity and ionic conductance even in high saline environments; therefore, a power density of 4.79 W/m2 can be achieved at the salinity gradient at which the sea water is mixed with river water (i.e., 50-fold KCl gradient). The impressively high-performance osmotic power can be attributed to numerous well-structured subnanoscale channels in the UiO-66-NH2 membrane and ANM. More surprisingly, the heterogeneous subnanochannel membrane developed can reveal an ultrahigh selectivity of up to 1240 times between Br－ and NO3－, indicating that it can export a record-high power density of 25.8 W/m2 in a 100-fold salinity gradient of KBr.