Osmotic energy, existing between solutions with different concentrations, is a sustainable and ecofriendly resource for solving energy issues. However, current membrane-based osmotic energy conversion technologies focus on electricity generation from an “open” system by directly mixing salt (NaCl) solutions at room temperature. For the integrated utilization of thermal energy and higher power output performance, we demonstrate thermoenhanced osmotic energy conversion by employing highly soluble lithium bromide (LiBr) solutions, asymmetric sulfonated poly(ether ether ketone)/poly(ether sulfone) (SPEEK/PES) membranes, and LiMn₂O₄/carbon nanotube (LMO/CNT) electrodes. The thin top layer of this heat-resistant membrane contains hydrophilic groups (i.e., the sulfonated groups in SPEEK) that are beneficial for ion-selective transport. The thermal effect on each solution is investigated, and osmotic energy conversion can be improved by regulating the heat gradient. The power density is ~16.50 W/m² by coupling with a temperature gradient (30 °C). This work is a step forward for promoting the performance of osmotic energy conversion with thermal energy assistance and provides the basis for a closed-loop system with regenerated osmotic energy from other energy forms. Moreover, the external field-osmotic hybrid energy conversion system shows powerful potential in the energy harvesting field.

渗透能存在于不同浓度的溶液之间，是解决能源问题的可持续和生态友好的资源。然而，目前基于膜的渗透能转换技术侧重于通过在室温下直接混合盐 (NaCl) 溶液从“开放”系统发电。为了综合利用热能和更高的功率输出性能，我们通过使用高溶解性溴化锂 (LiBr) 溶液、不对称磺化聚（醚醚酮）/聚（醚砜）（SPEEK/PES）膜证明了热增强渗透能转换, 和 LiMn ₂ O ₄/碳纳米管（LMO/CNT）电极。这种耐热膜的薄顶层包含有利于离子选择性传输的亲水基团（即 SPEEK 中的磺化基团）。研究了对每种溶液的热效应，通过调节热梯度可以提高渗透能转换。通过与温度梯度 (30 °C) 耦合，功率密度为 ~16.50 W/m ²。这项工作是在热能辅助下促进渗透能转换性能的一步，并为具有来自其他能量形式的再生渗透能的闭环系统提供了基础。此外，外场渗透混合能量转换系统在能量收集领域显示出强大的潜力。