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Hierarchical Oriented Metal-Organic Frameworks Assemblies for Water-Evaporation Induced Electricity Generation

机译：Hierarchical Oriented Metal-Organic Frameworks Assemblies for Water-Evaporation Induced Electricity Generation

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摘要

Advances in metal-organic frameworks (MOFs) are stimulating interest in water-evaporation induced electricity generation. Establishing design principles for desirable MOFs and revealing the structure-activity relationship is essential to development of this field. Around this key issue, herein the concept of "hierarchical oriented MOFs" is proposed and the Cu(BDC-OH) MOFs are organized into hierarchical oriented assemblies by successively using methods of hydrolysis, anion exchange reaction, and heteroepitaxy growth. It is discovered that this hierarchical oriented Cu(BDC-OH) assemblies-based generator containing long-ranged ordered microporous channels exhibits a voltage of 0.6 V and electricity output of 1.56 nW cm(-2) in the natural state of water evaporation. Finite element analysis and density functional calculation elucidate that hierarchical oriented structure of Cu(BDC-OH) MOFs with certain surface charge density have an "aggregation effect," dominating the final output voltages. This work not only offers valuable theoretical guidance for exploring self-assembly of MOFs superstructures and water-evaporation induced electricity generation, but also may open interesting perspectives for understanding some fundamental questions about structure-activity relationship in MOFs materials science.

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