The power generated from the Gibbs free energy of mixing through reverse electrodialysis (RED) is a promising renewable energy of great potential. In this study the performance of a nanochannel having a pH-regulated surface in RED is examined, focusing on the influence of the bulk salt concentration, the distribution of ${\text{H}}^{+}$, and the nanochannel size and its shape. Taking account of the effect of osmotic flow, we consider three types of nanochannel: bullet-shaped, conical, and trumpet-shaped nanochannels. Because the smaller the nanochannel space the more significant the degree of electric double layer overlapping the trumpet-shaped nanochannel has the best ion selectivity. As the ratio of (nanochannel length/curvature radius) varies the maximum power generated from a bullet-shaped nanochannel has a local maximum. This can be explained by the associated diffusion potential and the electric current passing through it. The results gathered provide desirable and necessary information for designing RED devices. In particular, the maximum power generation can be achieved by choosing appropriately the shape and the size of a nanochannel, and the bulk concentration ratio.

通过逆电渗析（RED）从吉布斯混合自由能产生的能量是一种很有前途的可再生能源，具有巨大的潜力。在这项研究中，研究了在RED中具有pH调节表面的纳米通道的性能，重点研究了总盐浓度，${\text{H}}^{+}$，以及纳米通道的大小及其形状。考虑到渗透流的影响，我们考虑了三种类型的纳米通道：子弹形，圆锥形和喇叭形纳米通道。因为纳米通道空间越小，与喇叭形纳米通道重叠的双电层的程度具有最佳的离子选择性。随着（纳米通道长度/曲率半径）的比率变化，从子弹形纳米通道产生的最大功率具有局部最大值。这可以通过相关的扩散电位和通过它的电流来解释。收集的结果为设计RED设备提供了理想且必要的信息。特别地，最大发电可以通过选择适当的形状和纳米通道的尺寸，体积浓度比来实现。