Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.266
Publication date: 18th July 2023
Hydrogen generated from solar-driven water-splitting process has the potential to be a clean, sustainable and abundant energy storage option [1,2]. The devices implemented in an integrated design approach, i.e., submerged in the electrolyte, pose a significant limitation when it comes to up-scaling [2]. The performance decreases due to added ohmic losses in the electrode or electrolyte and local pH gradients represents a significant challenge to overcome. The presence of the hydrogen gas bubbles at electrolyte/photoelectrode interface may assist in managing low pH gradients, if engineered properly. Beyond the state of the art, introducing a porosity to the photoelectrodes has been proposed as a shortcut to minimize the losses associated with up-scaling [2,3]. To study the optimal porous configuration of the water splitting device, mathematical modeling simulations were performed for various pore size (dpore = 10–400 μm) and pitch of 1mm. The overall impact of tailoring the dpore indicates that increasing porosity of the decreases the ohmic loss but increases the product bubble crossover (see Figure below). For the device to be operable with acceptable voltage loss of ~100 mV, the pore size should be less than 200 µm in diameter. These investigations are expected to contribute to advancing the development of large-scale water-splitting technology.
Figure 1 (a) Color map of total voltage losses for 10 cm long electrode with different size of pores. (b) Percentage of H2 crossovers due to porous structures of electrodes.
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