Flexible Organic Framework‐Modified Membranes for Osmotic Energy Harvesting

Abstract

Comprehensive Summary Bioinspired membranes are advantageous in capturing the osmotic energy. However, the conventional hybrid membranes possess low harvesting power density due to their low interfacial ionic transport efficiency and high internal resistance. Herein, a new kind of hybrid membranes consisting of porous polymer and flexible organic frameworks was developed. The 3D porous framework enables ions to flux with high efficiency at the polymer‐framework interface, resulting in high osmotic energy harvesting efficiency. By systematically screening the pore size of the frameworks, the output power density as high as 5.7 W/m2 was achieved under 50‐fold KCl salinity gradient.

Negative space charge modulated ion transport through PEDOT:PSS hydrogels integrating nanofluidic channels for highly efficient osmotic energy harvesting

“…The power density is the highest value reported in macro-scale porous hydrogel membranes based on electrodialysis (Fig. 4(e) and Table S2 †), [54][55][56][57][58][59][60][61][62][63][64][65] surpassing the commercial standard of 5 W m −2 . This again demonstrates that high performance osmotic energy harvesting can be achieved using 3D porous PEDOT:PSS hydrogels modied by a negative surface.…”

Nanomaterials‐Based Nanochannel Membrane for Osmotic Energy Harvesting

“…[28,53,113] Conversely, when the low-salt concentration is held constant, energy conversion efficiency tends to demonstrate an inverse relationship with the salinity gradient (Figure 7c). [18,36,39,95,111,168] Furthermore, as ion concentration polarization becomes increasingly prominent at higher salinity gradients, this phenomenon can result in a reduction in ion selectivity. Ultimately, it leads to an inverse relationship between energy conversion efficiency and the salinity gradient.…”

Anti‐Entropy Aggregation of Minority Groups in Polymers: Design and Applications

“…They offer advantages such as adjustable pore sizes, controllable interfacial groups, mechanical stability, and ease of fabrication. [39,[50][51][52][53] Focusing on the nanochannel membrane depicted in Figure 4, we have designed and selected various types of nanochannel membranes, resulting in a series of organic-inorganic [39,54] and organic-organic [55][56] asymmetric ion channel membranes (Figure 8). These asymmetric ion channels function similarly to a PN junction in semiconductors, exhibiting unidirectional ion transport behavior.…”