High-pressure synthesis of ε-FeOOH from β-FeOOH and its application to the water oxidation catalyst

Abstract

Research on materials under extreme conditions such as high pressures provides new insights into the evolution and dynamics of the earth and space sciences, but recently, this research has focused on applications as functional materials.

Unveiling the Influence of Sulfur Doping on Photoelectrochemical Performance in BiVO4/FeOOH Heterostructures

“…In some cases, it also functions as a passivation layer to suppress electron−hole recombination or a hole transfer layer. 28−31 To achieve higher efficiency, further endeavors, such as cation/anion doping, 32−34 oxygen vacancies introduction, 35,36 and phase structure transition, 37,38 have been dedicated. In particular, elemental doping can be used to modulate the electronic structure of surrounding metal active species and boost the catalytic activity.…”

“…According to the previous literature, FeOOH can exhibit genuine catalytic behavior to reduce the overpotential of the OER reactions. In some cases, it also functions as a passivation layer to suppress electron–hole recombination or a hole transfer layer. − To achieve higher efficiency, further endeavors, such as cation/anion doping, − oxygen vacancies introduction, , and phase structure transition, , have been dedicated. In particular, elemental doping can be used to modulate the electronic structure of surrounding metal active species and boost the catalytic activity. , Kim and co-workers found that the incorporation of Mn into FeOOH leads to an increase in active surface area and intrinsic activity by modulating the electronic structure of FeOOH .…”

Enhanced electrocatalytic oxygen redox reactions of iron oxide nanorod films by combining oxygen vacancy formation and cobalt doping

“…In recent years, a platform of earth-abundant-based nanostructured materials has attracted great attention for catalysis, sensing, and energy conversion applications. [24][25][26][27][28][29][30] Further, nanostructured materials architecture has several advantages in terms of size reduction or pores creation, which improve charge transfer and electrochemical reaction mechanisms. 31,32 In this regard, iron oxide nanostructured electrocatalysts have been investigated for energy conversions within water splitting due to their catalytic performance, low cost, non-toxicity, good stability, and excellent physical and chemical properties.…”

Covalent Grafting of Ruthenium Complexes on Iron Oxide Nanoparticles: Hybrid Materials for Photocatalytic Water Oxidation

“…N-type semiconductors such as TiO 2 , BiVO 4 , and α-Fe 2 O 3 or molecular dyes such as ruthenium tris-bipyridine complexes, , perylene, , polyheptazine, , metal-free porphyrins, and π-conjugated naphthalene benzimidazole polymers have been assayed as PSs in this context. Regarding the OER catalyst, oxides of transition metals such as IrO 2 , , CoO x , , Co–Pi, − or FeOOH − have been investigated, as well as some molecular complexes. , …”

“…Since then, only a few other systems were published. , Recently, our group also investigated this approach and reported the covalent grafting of a Ru complex PS onto Co 3 O 4 NPs, using pendant phosphonate linkers and its positive impact on the photoanode efficiency . We then expanded our work toward more environment-friendly catalysts, such as iron-based systems, considering that iron oxides , and iron oxohydroxides − have been reported to be active and stable electrocatalysts for the OER, but that none of these materials have been used so far to build a hybrid photoanode by combination with a molecular PS.…”