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Mitigating voltage losses in photoelectrochemical cell scale-up
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-04-03 , DOI: 10.1039/d0se00246a Fatwa F. Abdi 1, 2, 3, 4 , Ronald Ramiro Gutierrez Perez 5, 6, 7, 8, 9 , Sophia Haussener 5, 6, 7, 8, 9
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-04-03 , DOI: 10.1039/d0se00246a Fatwa F. Abdi 1, 2, 3, 4 , Ronald Ramiro Gutierrez Perez 5, 6, 7, 8, 9 , Sophia Haussener 5, 6, 7, 8, 9
Affiliation
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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.
中文翻译：
减轻光电化学电池放大过程中的电压损失
在太阳能水分解中，扩大光电化学电池的规模使其超出实验室规模的努力已开始引起广泛关注。已经证明了几种大面积的设备，但是效率通常比它们的小面积设备低得多。此处，二维有限元建模用于评估与中性pH溶液中运行的太阳能分水装置的按比例放大特别相关的电压损失的不同来源。我们定量研究电极面积对这些按比例增加的相关损失（底物欧姆损失，电解质欧姆损失和局部pH梯度相关损失）的影响。由于在电流密度为10 mA cm -2时电极高度为8 cm的电池的这些损耗，因此需要大约600 mV的额外超电势。然而，我们表明，通过应用工程和电池设计策略，可以减轻电压损耗，从而产生可接受的〜50 mV超电势。总的来说，这项研究突出了光电化学电池放大中要考虑的其他挑战，并提供了管理和减轻与缩放相关的损耗的策略。
更新日期：2020-04-03
中文翻译：
减轻光电化学电池放大过程中的电压损失
在太阳能水分解中，扩大光电化学电池的规模使其超出实验室规模的努力已开始引起广泛关注。已经证明了几种大面积的设备，但是效率通常比它们的小面积设备低得多。此处，二维有限元建模用于评估与中性pH溶液中运行的太阳能分水装置的按比例放大特别相关的电压损失的不同来源。我们定量研究电极面积对这些按比例增加的相关损失（底物欧姆损失，电解质欧姆损失和局部pH梯度相关损失）的影响。由于在电流密度为10 mA cm -2时电极高度为8 cm的电池的这些损耗，因此需要大约600 mV的额外超电势。然而，我们表明，通过应用工程和电池设计策略，可以减轻电压损耗，从而产生可接受的〜50 mV超电势。总的来说，这项研究突出了光电化学电池放大中要考虑的其他挑战，并提供了管理和减轻与缩放相关的损耗的策略。
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