Mitigating voltage losses in photoelectrochemical cell scale-up
Mitigating voltage losses in photoelectrochemical cell scale-up
复制标题
减少光电化学电池放大过程中的电压损失
DOI：
10.1039/d0se00246a
复制
发表时间：
2020
影响因子：
5.6
通讯作者：
S. Haussener
中科院分区：
文献类型：
--
作者：
F. Abdi;R. Gutiérrez Pérez;S. Haussener
在太阳能分解水方面，扩大光电化学电池的规模超过实验室规模的努力已经开始引起人们的极大关注。已经展示了几种大面积的设备，但通常效率远低于小面积的同等设备。在这里，使用二维有限元模型来评估在中性pH溶液中操作的太阳能分水装置中与放大有关的不同电压损失来源。我们定量地研究了电极面积对这些放大相关损耗(衬底欧姆损耗、电解液欧姆损耗和局部pH梯度相关损耗)的影响。对于电极高度为8 cm、电流密度为10 mA cm−2的电池，由于这些损耗需要大约600 mV的额外过电位。然而，我们表明，通过应用工程和电池设计策略，可以减小电压损耗，从而获得可接受的∼50 mV过电位。总体而言，这项研究强调了光电化学电池放大过程中需要考虑的其他挑战，并提供了管理和减少与缩放相关的损失的策略。
In solar water splitting, efforts in scaling up the photoelectrochemical cell beyond laboratory scale have started to attract significant attention. Several large-area devices have been demonstrated, but typically the efficiencies are much lower than their small-area equivalent. Here, two-dimensional finite element modeling is used to evaluate the different sources of voltage loss specifically related to scale-up in solar water splitting devices operated in neutral pH solutions. We quantitatively investigate the influence of the electrode area to these scale-up associated losses (substrate ohmic loss, electrolyte ohmic loss, and local pH-gradient related losses). About 600 mV additional overpotential is needed due to these losses for a cell with electrodes of height of 8 cm at a current density of 10 mA cm−2. We show, however, that by applying engineering and cell design strategies, the voltage losses can be mitigated, resulting in an acceptable ∼50 mV overpotential. Overall, this study highlights the additional challenges to be considered in photoelectrochemical cell scale-up and provides strategies to manage and mitigate scaling-related losses.