We study the influence of viscoelastic fluid on the enhancement of the electrochemomechanical energy conversion efficiency in the polyelectrolyte layer grafted narrow-fluidic channels. We obtain the velocity distribution using the simplified Phan-Thien-Tanner model and calculate the conversion efficiency in the purview of both with and without Debye-Hückel approximations. The analysis unveils that an increment in the fluid velocity obtained with an increment in the shear-thinning nature of the viscoelastic fluid increases the streaming of the counter-ions, which, in turn, increases the conversion efficiency. Also, it is shown that the increased electroviscous effect due to higher rate of streaming potential being developed results in a reduction in the predicted enhancement of the conversion efficiency. This phenomenon is observed for a window of parameters viz. higher polyelectrolyte layer thickness, higher viscoelastic parameter, and lower Debye-Hückel parameter of the electrolyte. We also report that the relatively higher electrostatic potential stemming from the overlapping electrical double layers and the higher wall potential (greater than 25 mV), lead to non-intuitive variation in the conversion efficiency following the pronounced influence of the electroviscous effect. While targeting an increment in the conversion efficiency using viscoelastic fluid and grafted polyelectrolyte layer, we also examine the influence of slip at the walls of the channel and the spatial variation of electrical conductance between the stern layer conductance and that of the walls of the channel. However, the rheology modulated enhancement in the efficiency is found to be effective in case of variation in the stern layer conductance and interfacial slip at the walls of the channel.

我们研究了粘弹性流体对聚电解质层接枝窄流体通道中电化学机械能转换效率的影响。我们使用简化的Phan-Thien-Tanner模型获得速度分布，并在有和没有Debye-Hückel近似的情况下计算转换效率。该分析揭示出，随着粘弹性流体的剪切稀化性质的增加而获得的流体速度的增加增加了抗衡离子的流动，这反过来又增加了转化效率。同样，显示出由于正在发展的更高的流电势速率而导致的电粘性效应的增加导致了转换效率的预期增强的降低。viz.较高的聚电解质层厚度，较高的粘弹性参数和较低的电解质Debye-Hückel参数。我们还报告说，由重叠的双电层产生的相对较高的静电势和较高的壁电势（大于25 mV）会导致电粘性效应的明显影响，导致转换效率出现非直观变化。在使用粘弹性流体和接枝的聚电解质层提高转化效率的同时，我们还研究了通道壁滑动的影响以及船尾层电导与通道壁电导之间电导的空间变化。然而，