Changes in the structure of electrodeposited manganese oxide water oxidation catalysts revealed by in-operando Raman spectroscopy

Au Nanocrystals@Defective Amorphous MnO2 Nanosheets Core/Shell Nanostructure with Effective CO2 Adsorption and Activation toward CO2 Electroreduction to CO

“…Raman spectroscopy is an effective method to obtain molecular vibration of the material. The Raman spectrum of Au NCs@a-MnO 2 -60 NSs in Figure b displayed two peaks at 580 and 633 cm –1 , where the former was ascribed to the Mn–O stretching vibration in the basal facet of the MnO 6 sheets, whereas the latter was attributed to the Mn–O symmetric stretching vibration of the MnO 6 octahedra. , The vibration peaks of Au NCs@c-MnO 2 NSs, a-MnO 2 NSs, and c-MnO 2 NSs were consistent with those of Au NC@a-MnO 2 -60 NSs because of the similar vibration features between amorphous and crystalline MnO 2 …”

“…33,34 The vibration peaks of Au NCs@c-MnO 2 NSs, a-MnO 2 NSs, and c-MnO 2 NSs were consistent with those of Au NC@a-MnO 2 -60 NSs because of the similar vibration features between amorphous and crystalline MnO 2 . 35 The surface chemical valence states and the electric interaction of the products were precisely investigated via XPS spectrum. For Au NCs@a-MnO 2 -60 NSs, two peaks at 84.0 and 87.7 eV in Au 4f spectrum were Au 4f 7/2 and Au 4f 5/2 of Au 0 , respectively (Figure 3a).…”

Water electrolysis: from textbook knowledge to the latest scientific strategies and industrial developments

“…They proposed that such CoS 2 -like clusters are generated in cathodic polarisation, thereby exposing a high density of catalytically active sulphur sites for enhanced HER. Other studies using Raman spectroscopy soon followed, 1768, [1784][1785][1786][1787][1788][1789][1790] demonstrating its clear interest to unveil catalysts' structural changes upon operation, elucidate their possible active sites and the intermediates formed during (water) electrolysis.…”