Dong Yuhua, Zhao Zhuo, Zhao Jing, Guo Zaichao, Du Guanghua, Sun Youmei, He Deyan, Duan Jinglai, Liu Jie, Yao Huijun
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou730000, PR China.
Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou730000, PR China.
ACS Appl Mater Interfaces. 2022 Jun 29;14(25):29197-29212. doi: 10.1021/acsami.2c05247. Epub 2022 Jun 15.
Extracting clean energy by converting the salinity gradient between river and sea into energy is an effective way to reduce the global pollution and carbon emissions. Reverse electrodialysis (RED) is of great importance to realize the energy conversion assisting the ion-selective membrane. However, its higher ion resistance and lower conversion efficiency results in the undesirable power conversion performance. Here, we demonstrate a 1D/2D hybrid nanochannel system to achieve high osmotic energy conversion and output power. This heterogeneous structure is composed of two structures, in which the subnanometer nanochannels in graphene oxide membrane (GOM) can serve as a selective layer and reduce the ion diffusion energy barrier, while the nanochannel in the polymer can introduce asymmetry to enhance ionic rectification and conversion efficiency. This heterogeneous membrane exhibits excellent cation selectivity and enhanced ionic current rectification (ICR) performance. The application of the GOM/PET hybrid nanochannel system in osmotic energy harvesting is evaluated, and the output power can reach up to 118.2 pW with the energy conversion efficiency of 40.3%. Theoretical calculation indicates that the 1D/2D hybrid system can effectively take the advantage of excellent cation selectivity of 2D lamellar nanochannels to improve its RED performance significantly.
通过将河流与海洋之间的盐度梯度转化为能量来提取清洁能源是减少全球污染和碳排放的有效途径。反向电渗析（RED）对于实现借助离子选择膜的能量转换至关重要。然而，其较高的离子电阻和较低的转换效率导致不理想的功率转换性能。在此，我们展示了一种一维/二维混合纳米通道系统，以实现高渗透能转换和输出功率。这种异质结构由两种结构组成，其中氧化石墨烯膜（GOM）中的亚纳米级纳米通道可作为选择层并降低离子扩散能垒，而聚合物中的纳米通道可引入不对称性以增强离子整流和转换效率。这种异质膜表现出优异的阳离子选择性和增强的离子电流整流（ICR）性能。评估了GOM/PET混合纳米通道系统在渗透能收集中的应用，输出功率可达118.2皮瓦，能量转换效率为40.3%。理论计算表明，一维/二维混合系统可有效利用二维层状纳米通道优异的阳离子选择性，显著提高其RED性能。
