| The salt difference energy at the confluence of river water and sea water contains a lot of energy and is considered to be a new type of renewable energy.Reverse electrodialysis of ion exchange membrane is one of the most effective technologies to convert salinity energy into electrical energy.A selective ion exchange membrane is placed at the confluence of seawater and river water.The concentrated ions flow to the low-concentration river water due to the osmotic pressure,and the corresponding electrodes are coupled to convert the ion signal into electronic signal,thereby effectively converting the salinity energy at the confluence of the river water and the seawater into electrical energy.Ion exchange membrane is the most important part of reverse electrodialysis technology,and its performance directly determines the efficiency of energy conversion.At present,researchers have developed many ion exchange membranes to realize the conversion of salinity energy,such as graphene oxide,Mxene,etc.However,most of these membranes only have cation selectivity and can just directionally transport cations from seawater to low-concentration river water,which ignores the presence of equal amounts of anions in seawater and river water.Based on this,in this paper,a sub-nanochannel anion-selective composite membrane was constructed,based on UiO-66-NH2 metal-organic frameworks（MOFs）composited with anodized aluminum oxide（AAO）substrates,and high-performance was achieved by mixing artificial seawater（0.5 M Na Cl）and river water（0.01 M Na Cl）with a maximum power density of 1.47 W/m~2,which is maintained under one week of continuous operation.Furthermore,we tune the surface charge density of the material by changing p H and achieve higher output power density under acidic condition.The UiO-66-NH2@AAO composite membrane is inexpensive and easy to fabricate,with a dense structure and long-term working stability in salt water,and it has great potential to meet future energy demands. |
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