“…In Figure f, the MoO 2 sample displays main peaks at 198, 738, and 870 cm –1 , which are attributed to MoO 2 . , With the addition of Co, the new peaks at 306, 811, and 913 cm –1 are observed in the CoMoO 4 sample (Figure g). These peaks are associated with Mo–O–Co vibration, coinciding with the CoMoO 4 phase. , As shown in Figure h, the mixture (MoO 2 + Co 3 O 4 ) sample shows absorption bands at 189, 478, 608, and 670 cm –1 , which are associated with the Co 3 O 4 . , The peaks at 365 and 934 cm –1 are attributed to MoO 2 and that at 870 cm –1 is ascribed to CoMoO 4 .…”