Can seawater also generate electricity? Magical salinity gradient power generation two-dimensional membrane material!

May 28, 2022,University of Technology Sydney Professor Wang Guoxiu’s research groupatNano Research Energy ( a roundup article titled “Progress and Prospects of two-dimensional materials for membrane-based osmotic power generation”.

Electricity generated from differences in salinity between seawater and river interfaces on Earth is one of the clean energy sources for sustainable development in the future. Among them, pressure-delayed permeation based on water molecular dynamics and ion dynamics-basedReverse dialysis is the two mainstream energy conversion technologies, but the maximum power density of the pressure delayed permeation pilot plant is insufficient to achieve commercialization. Reverse electrodialysis technology utilizes nanofluid channels with selective permeability to selectively diffuse cations and anions by reverse electrodialysis, resulting in voltage differences that power electronic devices or store energy in batteries.At present, these nanofluid channels are made of a variety of membrane materials, of which two-dimensional materials have become the most promising materials because of their high ionic conductivity, high mechanical strength, large-scale production capacity and the ability to form ultra-thin layers. In addition, by mixing two-dimensional materials with other nanomaterials, it is possible to create nanostructures with enhanced properties. The latest research shows that several types of two-dimensional materials and their nanocomposites used in salinity gradient power generation have obtained satisfactory power densities.

The main focus of this reviewApplication of advanced two-dimensional membrane materials in salinity gradient power generation。 The authors outline the basic principles and ion transport mechanisms of reverse electrodialysis, and summarize the two-dimensional membranes of different nanostructures, including atomic-thick two-dimensional films with nanopores, two-dimensional laminated films, two-dimensional layered films with nanopores, two-dimensional/one-dimensional and two-dimensional mixed membranes. This article is systematically elaboratedPreparation method, physical properties, ion transport characteristics and principle of osmotic energy conversion of two-dimensional membrane。 Finally, the author proposes future research directions in this field,Further study of two-dimensional materialsIt can increase the salinity gradient power generation power and promote its practicalization and commercialization.

Figure 1: (a) Number of publications and citations in the field of permeation power generation in the Web of Science from 2003 to 2021. (b) Using two-dimensional materials with ion selectivity to utilize electrical energy from differences in salinity in seawater and river water, this paper reviews advanced two-dimensional membrane materials with various nanostructures and ion transport characteristics.

Related paper information:

Javad Safaei, Guoxiu Wang. Progress and prospects of two-dimensional materials for membrane-based osmotic power generation. Nano Res. Energy 2022, 1: e9120008. DOI: 10.26599/NRE.2022.9120008.

As a sister journal of Nano Research, Nano Research Energy (ISSN: 2791-0091; e-ISSN: 2790-8119; Official website: was launched in March 2022 and is co-edited by Professor Qu Liangti of Tsinghua University and Professor Chunyi Zhi of the City University of Hong Kong. Nano Research Energy is an international multidisciplinary, all-English open access journal, focusing on the cutting-edge research and application of nanomaterials and nanoscience technology in new energy-related fields, benchmarking against the top international energy journals, and committed to publishing high-level original research and review papers.

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