An experimental study of the electronic structure of anodically grown films on an amorphous Ni₇₈Si₈B₁₄ alloy

Abstract

dFilms of Ni(OH) 2 and NiOOH grown on a rapidly solidified amorphous Ni 78 Si 8 B 14 alloy by anodic polarisation were analysed with XPS and the results were compared with those of NiO and of films grown on polycrystalline Ni. SIMS performed on the polarised alloy showed enrichment of Ni at the outermost surface. Transmission electron microscopy (TEM) of cross-sectional samples showed an absence of crystallinity. The Ni 2p shake up satellite and valence band spectra suggested that NiOOH is characterised by a more enhanced n-type semi-conducting behaviour compared to Ni(OH) 2 in agreement with earlier tunnelling current density measurements performed with scanning tunnelling spectroscopy (STS).

X-ray Photoelectron Spectroscopic Investigation of Plasma-Enhanced Chemical Vapor Deposited NiOx, NiOx(OH)y, and CoNiOx(OH)y: Influence of the Chemical Composition on the Catalytic Activity for the Oxygen Evolution Reaction

“…The LBE feature may be attributed to the presence of NiOOH or of NiO. However, the valence band provides a first hint that an oxyhydroxide was deposited because the intense Ni 3d state feature at 2.4 eV, which is characteristic for NiO, is absent …”

“…However, the valence band provides a first hint that an oxyhydroxide was deposited because the intense Ni 3d state feature at 2.4 eV, which is characteristic for NiO, is absent. 16 The maximum peak position of the Ni 2p line is difficult to assign to only one chemical state. Grosvenor et al presented a detailed XPS study focusing on the differences in the multiplet splitting of NiO, Ni(OH) 2 , and NiOOH as well as considering the plasmon loss structure.…”

NiOx Nanoflower Modified Cotton Fabric for UV Filter and Gas Sensing Applications

“…The gas sensing mechanism of metal oxide material modified cotton surface is based on the model of electron transfer dynamic during oxygen adsorption and desorption processes, which result in the change in surface resistance of the sensing element. When the surface modified cotton fabric is exposed to atmosphere, oxygen molecules get chemisorbed on the surface by trapping electrons from the conduction band of n-type semiconducting NiO x . This interaction leads to the formation of surface charge region with O 2 – ions, in turn increasing the surface resistance of the modified cotton fabric.…”

Scanning Tunneling Spectroscope Use in Electrocatalysis Testing

“…The surfaces of the alloys were investigated after the electrochemical tests were performed. Due to previous studies by Knutsen et al [ 18 , 19 ], the alloying elements Si, B, Co, and Mo are expected to give changes in the electronic properties, both of the Ni atoms in the bulk, and also in the oxidized surface. The air-formed oxide layer on the surface of the alloys is expected to be NiO or Ni(OH) 2 .…”