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Due to the accelerating paradigm shift toward renewable energy, water electrolysis systems have been evaluated for their ability to act as long-term renewable energy stores, wherein the energy is stored in the form of hydrogen gas. However, when renewable energy sources are employed, the power provided is intermittent, so developing highly active and durable electrode materials that function under these conditions is necessary. In particular, the irregular power supply accelerates severe degradation of the Ni-based electrodes due to irreversible surface oxidation, structural defects or collapse of the layered structure. Herein, we designed and fabricated Ni-based binary electrodes for alkaline water electrolyzers (Ni-Al & Ni-P electrodes for HER, Ni-Fe LDH electrodes for OER), and evaluated their electrochemical performance under dynamic operating conditions. Importantly, no significant OER & HER performance degradation was observed after the lab-scale dynamic operation tests, and no structural deformation or metal ion dissolution was found to occur. We further demonstrated the stability under the dynamic using advanced analysis and simulation techniques (XAS, in-situ ICP-MS, DFT calculations)
Kim et al. (Fri,) studied this question.