Abstract：
As promising prospects for renewable power harvesting, two-dimensional (2D) nanochannels for osmotic energy capture in a reverse electrodialysis arrangement have garnered significant attention. However, existing 2D nanochannel membranes have shown limited power generation capabilities due to challenges in balancing ion flux and selectivity. Here, we construct montmorillonite (MMT)/TEMPO-mediated oxidation cellulose nanofibers (TOCNFs) nanocomposite membranes for enhanced ion transmembrane transport. The intercalation of TOCNFs not only enlarges the interlayer distance, but also provides abundant space charge inside the nanochannels. Benefiting from the strong ion selectivity and high ion flux, the composite membrane achieves a remarkable power output of ∼16.57 W/m2 in the gradient of artificial seawater and river water, exceeding that of the state-of-the-art heterogeneous membrane-based osmotic energy conversion systems. Both experimental and theoretical findings confirm that the synergism of space and surface charge plays a crucial role in promoting osmotic energy conversion. This research contributes valuable insights into the optimization of 2D membranes for efficient clean energy harvesting purposes.
摘要：
作为可再生能源收集的前景广阔，在反向电渗析布置中用于渗透能量捕获的二维(2D)纳米通道已经引起了极大的关注。然而,由于在平衡离子通量和选择性方面的挑战,现有的2D纳米通道膜已经显示出有限的发电能力。这里,我们构建了蒙脱石（MMT）/TEMPO介导的氧化纤维素纳米纤维（TOCNFs）纳米复合膜，以增强离子跨膜传输。TOCNFs的插层不仅扩大了层间距离，而且还在纳米通道内提供了丰富的空间电荷。得益于强离子选择性和高离子通量，复合膜在人工海水和河水的梯度中实现了〜16.57W/m2的显着功率输出，超过了最先进的基于异质膜的渗透能量转换系统。实验和理论发现都证实，空间和表面电荷的协同作用在促进渗透能转换中起着至关重要的作用。这项研究为二维膜的优化提供了宝贵的见解，以实现高效的清洁能源收集目的。
