| Popis: |
High entropy nitrides are largely unexplored materials with high potential to show good mechanical properties, high stability against chemicals, but also promising catalytic properties. The latter is due to their good electrical conductivity compared to (high entropy) oxides. The high entropy nitride system (Ti-Co-Mo-Ta-W)N was investigated, to combine binary and ternary nitrides, which show good water splitting activities. Continuous composition spread thin film materials libraries were deposited using reactive co-sputter deposition at 300 and 500°C. X-ray diffraction results show that the films consist of a single-phase solid solution in NaCl-type structure. The surface morphology, examined using scanning electron and atomic force microscopy, is related to the deposition temperature. (TiCoMoTaW)N films show low resistivity values in the range from 1.72 to 5.2 µΩ*cm. Their oxygen evolution reaction activity was measured using a scanning droplet cell, with a maximum current density of 1.78 \(\frac{\text{m}\text{A}}{{\text{c}\text{m}}^{2}}\) at 1700 mV vs. RHE at a Co-rich area. However, the stability under electrochemical load is critical. |
