Low Temperature Hydrothermal Method for Synthesis of Crystalline Fe₂O₃ and their Oxygen Evolution Performance

Abstract

Hydrothermal method for the synthesis of hematite (α‐Fe2O3) has been done at 120 °C. Morphological study reveals the formation of spherical nanoparticles of average size ∼10 nm. The prepared electrode (Fe2O3 dropcosted over graphite sheet) used as a working electrode for the oxygen evolution reaction in 1 M KOH. The linear sweep voltammetry confirms that the as‐prepared electrode requires 340 mV potential to reach a current density of 1 mA/cm2 and 510 mV potential for 10 mA/cm2. Further, the kinetics of electrocatalyst has been investigated using Tafel slope, mass activity and Turn over frequency.

Solar enhanced oxygen evolution reaction with transition metal telluride

“…The transition metal oxides have shown good performance for OER electrocatalysis. However, their high bandgap and limited electrical conductivity along with higher overpotential for OER has limited their superiority compared to precious metal oxides (Rana et al, 2020;Gao et al, 2021;Zhang et al, 2021;Hu et al, 2022). The advancements made through doping and the use of carbon-based supports, significantly enhance the OER activity of transition metal oxides.…”

Fabrication of Hematite Photoanode Consisting of (110)‐Oriented Single Crystals

“…[18][19][20][21][22][23][24] Among these methods, hydrothermal method is one of the most suitable methods to fabricate α-Fe 2 O 3 Photo-anodes not only because it is easy to synthesize α-Fe 2 O 3 nanoparticles with controllable morphologies with low cost, but also it can synthesize α-Fe 2 O 3 nanoparticles with fewer defects owing to the dissolution-recrystallization process. [25][26][27] Therefore, in this work, we fabricate a (110) oriented α-Fe 2 O 3 photoanode consisted of a single layer of high-crystalline α-Fe 2 O 3 nanocrystals through a one-step hydrothermal process on a FTO substrate. Although the size of the as-prepared α-Fe 2 O 3 nanocrystals is large ( � 200 nm), the high crystallinity of the α-Fe 2 O 3 nanocrystals and free of any grain boundaries in the photoanode enable it to exhibit a good PEC performance.…”

“…According to literatures, α‐Fe 2 O 3 can be synthesized by various methods, such as hydrolysis method, precipitation method, combustion method, hydrothermal method, etc [18–24] . Among these methods, hydrothermal method is one of the most suitable methods to fabricate α‐Fe 2 O 3 Photoanodes not only because it is easy to synthesize α‐Fe 2 O 3 nanoparticles with controllable morphologies with low cost, but also it can synthesize α‐Fe 2 O 3 nanoparticles with fewer defects owing to the dissolution‐recrystallization process [25–27] . Therefore, in this work, we fabricate a (110) oriented α‐Fe 2 O 3 photoanode consisted of a single layer of high‐crystalline α‐Fe 2 O 3 nanocrystals through a one‐step hydrothermal process on a FTO substrate.…”

Conversion of scrap iron into ultrafine α-Fe2O3 nanorods for the efficient visible light photodegradation of ciprofloxacin

“…26 Over the years, a-Fe 2 O 3 has been proven to be environmentally friendly, high in abundance due to its constituent iron, nontoxic in nature and to have high chemical stability. Several synthetic routes have been utilized for the synthesis of a-Fe 2 O 3 [27][28][29][30]…”