Engineered asymmetric heterogeneous membrane: a concentration-gradient-driven energy harvesting device

Zhen Zhang, Xiang-Yu Kong, Kai Xiao, Qian Liu, Ganhua Xie, Pei Li, Jie Ma, Ye Tian, Liping Wen, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

138 Citations (Scopus)

Abstract

Engineered asymmetric membranes for intelligent molecular and ionic transport control at the nanoscale have gained significant attention and offer prospects for broad application in nanofluidics, energy conversion, and biosensors. Therefore, it is desirable to construct a high-performance heterogeneous membrane capable of coordinating highly selective and rectified ionic transport with a simple, versatile, engineered method to mimic the delicate functionality of biological channels. Here, we demonstrate an engineered asymmetric heterogeneous membrane by combining a porous block copolymer (BCP) membrane, polystyrene-b-poly(4-vinylpyridine) (PS48400-b-P4VP21300), with a track-etched asymmetric porous polyethylene terephthalate membrane. The introduction of chemical, geometrical, and electrostatic heterostructures provides our heterogeneous membrane with excellent anion selectivity and ultrahigh ionic rectification with a ratio of ca. 1075, which is considerably higher than that of existing ionic rectifying systems. This anion-selective heterogeneous membrane was further developed into an energy conversion device to harvest the energy stored in an electrochemical concentration gradient. The concentration polarization phenomenon that commonly exists in traditional reverse electrodialysis can be eliminated with an asymmetric bipolar structure, which considerably increases the output power density. This work presents an important paradigm for the use of versatile BCPs in nanofluidic systems and opens new and promising routes to various breakthroughs in the fields of chemistry, materials science, bioscience, and nanotechnology.

Original languageEnglish
Pages (from-to)14765-14772
Number of pages8
JournalJournal of the American Chemical Society
Volume137
Issue number46
DOIs
Publication statusPublished - 25 Nov 2015
Externally publishedYes

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