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Abstract：
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.
摘要：
具有非对称通道几何结构和/或电荷布局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出色的性能，但是工作机制仍然模糊。在这里，通过耦合Poisson-Nernst-Planck和Navier-Strokes方程，我们系统地研究了基于直型纳米通道的双极离子二极管的RED能量转换。纳米通道结构的影响，充电极性，研究了工作流体对输出电压和输出功率的对称性以及特性。结果表明,当采用高浓度补料液时,与单极通道RED系统相比，基于双极离子二极管的RED系统具有更高的输出电压和输出功率。在最优条件下,双极通道的电压输出增加了100%，功率输出增加了260%。这项工作为高性能盐度能量采集器的设计和优化以及海水淡化开辟了一条新途径。
