Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Alkaline electrolysis is widely used in commercial water electrolyzers due to its cost-effectiveness and scalability. However, a major challenge is the issue of oxygen crossover through the porous separator, which leads to the degradation of the catalyst in the cathode. This degradation occurs as a result of the unintended oxygen reduction reaction (ORR), leading to a loss of activity for the hydrogen evolution reaction (HER). Herein, we present NiFeP@Ni_NC, a bifunctional catalyst with decoupled active sites for both the HER and ORR. We achieve this by utilizing Ni metal-organic frameworks to induce decoupled active sites in a hybrid material. The hybrid material, NiFeP@Ni_NC, consists of an ORR catalytic N-doped carbon layer that protects HER catalytic Niδ+ from the undesired ORR. As a result, NiFeP@Ni_NC demonstrates excellent bifunctional stability. This strategy for enhancing HER stability can be applied more broadly in the design of bifunctional electrocatalysts with improved stability in alkaline electrolysis.
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