Fig. 3.

Characterization of the HEA-Co_xMo_y nanoparticles. a XRD patterns of the HEA nanoparticles supported on CNFs in comparison to the bimetallic standards of CoCu (PDF# 50–1452), Fe₃Ni₂ alloy (PDF# 65–5131), Co₃Mo (JCDPS no. 29–0488), and Co₇Mo₆ (JCDPS no. 29–0489). b Comparison of the composition analyses for the HEA-Co₂₅Mo₄₅ nanoparticles based on three different techniques: ICP-MS, XPS, and EDX, verifying the alloy homogeneity in the HEA nanoparticles. Error bars denote SDs. c XPS spectra collected at the Mo 3d, Fe 2p, Co 2p, Ni 2p, and Cu 2p edges for the HEA-Co₂₅Mo₄₅ nanoparticles