| 초록 |
Tuning the bifunctional water splitting fingerprints toward H2 and O2 evolution through the design of architectures incorporating multiple functionalities is of increasing attention. Here, Ni- and Ru-based electrocatalysts with increasing Ni/Ru content ratios were designed through a one-step heat treatment at 250°C of ruthenate nanosheets, and NiCl26H2O and NaH2PO2H2O precursors, under argon flow. XPS measurements confirmed that incorporated narrow Ni-based moieties on the surface of the ruthenium substrate were swiftly oxidized to NiO, whereas larger Ni-based agglomerates at higher Ni/Ru ratios were less prone to oxidation. This size-dependent propensity of Ni2P to oxidation was here reported for the first time and shown to directly determine the OER performance of the resulting hybrids. Our results reflect the difficulty in the integration of multiple phases during the synthesis procedure and its effect on resulting catalytic behaviors. |
