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3D imaging-informed electrode engineering for water splitting
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DOI：10.1039/D6EE00290K.png)
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Abstract
En 中文
Gas bubble accumulation limits mass transport in porous electrodes during alkaline water electrolysis at high current densities. Herein; synchrotron-based operando micro-CT and microstructure-resolved lattice Boltzmann method simulations are employed to unveil how porosity and geometric structure govern hydrogen bubble detachment and two-phase transport in alkaline water electrolysis. It is found that porous electrodes with a rationally designed ordered pore architecture enable efficient mass transport by minimizing gas trapping and promoting continuous electrolyte renewal. By contrast; commercial nickel foams with low porosity; despite their larger surface area; exhibit severe gas accumulation and poor electrode utilization. Guided by these insights; we 3D-printed a highly ordered square-grid electrode and; following catalyst deposition; achieved high-efficiency overall water splitting at 2 A cm−2 with a cell voltage of 2.13 V. This methodology; integrating operando micro-CT and lattice Boltzmann method simulations; delivers much-needed design rules for gas evolving porous electrodes and demonstrates that tuning a 3D pore architecture is critical for advanced alkaline water electrolysis.
Keywords:
gas bubble accumulation
porous electrodes
alkaline water electrolysis
micro-CT imaging
lattice Boltzmann method
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