Novel Synthesis of Nanosized Cellular Iron Oxide/Oxyhydroxide Thin Films

Abstract

Iron oxide/oxyhydroxide thin films are currently being investigated for their applications in photoelectrochemical solar cells for solar energy conversion, sensors, catalysts, Li batteries, and electrochemical capacitors. The fabrication of nanoarchitectural thin films is very important for those applications because of the size-related effects of their performance. This study reports the novel synthesis of nanosized cellular iron oxide/oxyhydroxide thin films with high degrees of crystallinity and purity by electrochemical deposition of green rust thin films and their chemical oxidation. This technique is applicable to substrates with large surface areas of a few square centimeters or above without the aid of templates, high temperature, vacuum, or post-treatment.

Synthesis of phase pure iron oxide polymorphs thin films and their enhanced magnetic properties

“…2b. This spectrum matches well with reported spectrum in the literature, which shows that there is no feature indicative to either of c-Fe 2 O 3 and a-Fe 2 O 3 contamination [33]. In this spectrum, the pronounced Fe 3 O 4 feature at 668 cm -1 is attributed to A 1g mode, whereas the weak features at 315 and 535 cm -1 are assigned to T 1g mode of vibration [30,31,34].…”

Electrocatalytic water oxidation at amorphous trimetallic oxides based on FeCoNiOx

“…34 and 35) and also consistent with iron oxyhydroxide lms. 36 (Fig. S4 †) for the as-deposited material which is comparable with the X-ray photoelectron spectroscopy (XPS) data as Fe 20 Co 37 Ni 43 O x H y .…”

Operando spectroscopy study of the carbon dioxide electro-reduction by iron species on nitrogen-doped carbon

“…The anodic drift of the potential indicates that an oxidation process is taking place. This observation could be explained not only as phase transformation of some Fe(II) sites present in the solid phase 30 , but also as an indication of the mobilization of the Fe(III) species of ferrihydrite in carbonate media leading to the formation of Fe(II) aq carbonate species 12 , the latter species undergoing further oxidation and re-precipitation. However, given the small and rapid variation of the OCP, we conclude that the process is limited in this case and the ferrihydrite/KHCO 3 interface equilibrates rapidly.…”