Peng Ran, Li Tong, Song Hanqiong, Wang Shiyao, Song Yongxin, Wang Junsheng, Xu Minyi
College of Marine Engineering, Dalian Maritime University, Lingshui Road, Dalian 116026 China.
Dalian Key Lab of Marine Micro/Nano Energy and Self-Powered System, Dalian Maritime University, Dalian 116026, China.
iScience. 2023 Jun 20;26(7):107184. doi: 10.1016/j.isci.2023.107184. eCollection 2023 Jul 21.
Ionic diodes constructed with asymmetric channel geometry and/or charge layout have shown outstanding performance in ion transport manipulation and reverse electrodialysis (RED) energy collection, but the working mechanism is still indistinct. Herein, we systematically investigated RED energy conversion of straight nanochannel-based bipolar ionic diode by coupling the Poisson-Nernst-Planck and Navier-Strokes equations. The effects of nanochannel structure, charging polarity, and symmetricity as well as properties of working fluids on the output voltage and output power were investigated. The results show that as high-concentration feeding solution is applied, the bipolar ionic diode-based RED system gives higher output voltage and output power compared to the unipolar channel RED system. Under optimal conditions, the voltage output of the bipolar channel is increased by ∼100% and the power output is increased by ∼260%. This work opens a new route for the design and optimization of high-performance salinity energy harvester as well as for water desalination.
采用不对称通道几何结构和/或电荷布局构建的离子二极管在离子传输操纵和反向电渗析（RED）能量收集方面表现出卓越性能，但其工作机制仍不明确。在此，我们通过耦合泊松-能斯特-普朗克方程和纳维-斯托克斯方程，系统地研究了基于直纳米通道的双极离子二极管的RED能量转换。研究了纳米通道结构、充电极性和对称性以及工作流体性质对输出电压和输出功率的影响。结果表明，当应用高浓度进料溶液时，基于双极离子二极管的RED系统与单极通道RED系统相比，具有更高的输出电压和输出功率。在最佳条件下，双极通道的电压输出提高了约100%，功率输出提高了约260%。这项工作为高性能盐度能量收集器的设计和优化以及水脱盐开辟了一条新途径。
