Zhang Liping, Zhou Shan, Xie Lei, Wen Liping, Tang Jinyao, Liang Kang, Kong Xiangyu, Zeng Jie, Zhang Runhao, Liu Jiaqing, Qiu Beilei, Jiang Lei, Kong Biao
Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials and iChem, Fudan University, Shanghai, 200438, P. R. China.
CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Small. 2021 Apr;17(13):e2100141. doi: 10.1002/smll.202100141. Epub 2021 Mar 10.
Salinity gradient energy existing in seawater and river water is a sustainable and environmentally energy resource that has drawn significant attention of researchers in the background of energy crisis. Nanochannel membrane with a unique nano-confinement effect has been widely applied to harvest the salinity gradient energy. Here, Janus porous heterochannels constructed from 2D graphene oxide modified with polyamide (PA-GO) and oxide array (anodic aluminum oxide, AAO) are prepared through an interfacial super-assembly method, which can achieve oriented ion transportation. Compared with traditional nanochannels, the PA-GO/AAO heterochannels with asymmetric charge distribution and T-mode geometrical nanochannel structure shows directional ionic rectification features and outstanding cation selectivity. The resulting heterochannel membrane can achieve a high-power density of up to 3.73 W m between artificial seawater and river water. Furthermore, high energy conversion efficiency of 30.3% even in high salinity gradient can be obtained. These achievable results indicate that the PA-GO/AAO heterochannels has significant potential application in salinity gradient energy harvesting.
海水和河水中存在的盐度梯度能是一种可持续且环保的能源，在能源危机背景下受到了研究人员的广泛关注。具有独特纳米限域效应的纳米通道膜已被广泛应用于收集盐度梯度能。在此，通过界面超组装法制备了由聚酰胺修饰的二维氧化石墨烯（PA-GO）和氧化物阵列（阳极氧化铝，AAO）构建的Janus多孔异质通道，其能够实现定向离子传输。与传统纳米通道相比，具有不对称电荷分布和T型几何纳米通道结构的PA-GO/AAO异质通道表现出定向离子整流特性和出色的阳离子选择性。所得的异质通道膜在人工海水和河水之间可实现高达3.73 W/m² 的高功率密度。此外，即使在高盐度梯度下也能获得30.3%的高能量转换效率。这些可实现的结果表明，PA-GO/AAO异质通道在盐度梯度能收集方面具有显著的潜在应用价值。
