Construction of Core–Shell CoMoO4@γ-FeOOH Nanosheets for Efficient Oxygen Evolution Reaction

Abstract

The oxygen evolution reaction (OER) occurs at the anode in numerous electrochemical reactions and plays an important role due to the nature of proton-coupled electron transfer. However, the high voltage requirement and low stability of the OER dramatically limits the total energy converting efficiency. Recently, electrocatalysts based on multi-metal oxyhydroxides have been reported as excellent substitutes for commercial noble metal catalysts due to their outstanding OER activities. However, normal synthesis routes lead to either the encapsulation of excessively active sites or aggregation during the electrolysis. To this end, we design a novel core–shell structure integrating CoMoO4 as support frameworks covered with two-dimensional γ-FeOOH nanosheets on the surface. By involving CoMoO4, the electrochemically active surface area is significantly enhanced. Additionally, Co atoms immerge into the γ-FeOOH nanosheet, tuning its electronic structure and providing additional active sites. More importantly, the catalysts exhibit excellent OER catalytic performance, reducing overpotentials to merely 243.1 mV a versus 10 mA cm−2. The current strategy contributes to advancing the frontiers of new types of OER electrocatalysts by applying a proper support as a multi-functional platform.

Construction of FeOOH modified CoMxOy (M = Mo, W, V) on nickel foam for highly efficient oxygen evolution reaction

“…Compared with the core–shell CoMoO 4 @γ-FeOOH material, 58 due to the difference in temperature time, dose and immersion solution, nanospheres self-assembled from nanosheet structure FeOOH–CoMoO 4 /NF designed in this work display significantly improved active specific surface areas, and provides optimal charge transfer channels and easier electrical connection with substrates, which leads to a more remarkable OER performance. From the comparison of SEM images and electrochemical performance analysis of different Co-based precursors (CoMoO 4 , CoWO 4 and Co 3 (VO 4 ) 2 ), we can find that Mo exhibits stronger electronic effects and better electrical conductivity compared to V and W.…”

Iron Oxyhydroxide: Structure and Applications in Electrocatalytic Oxygen Evolution Reaction

“…[ 24a,45 ] On the other hand, introducing metal oxides with catalytic activity can also create new active sites of the hybrid catalysts. [ 40b,46 ] According to whether the doped metal oxides can be active sites of the catalysts, the doped components are divided into active components, such as cobalt oxide, [ 47 ] perovskite, [ 48 ] spinel, [ 49 ] and molybdate, [ 50 ] and auxiliary components including CeO 2 , [ 51 ] WO 3 , [ 52 ] PbO 2 , [ 53 ] V 2 O 3 , [ 54 ] et al In this section, we have discussed hybrid materials of active and inactive components, respectively.…”

FeOOH nanosheet assisted metal ion coordination with porphyrins for rapid detection and removal of cadmium ions in water

“…[40][41][42][43][44] For example, FeOOH nanosheets serve as effective co-catalysts and supercapacitors for various catalytic reactions because of their high oxygen vacancies, large specic surface area, and highperformance energy storage. [45][46][47][48] It is noteworthy that in the above cases, the materials that synergize with FeOOH nanosheets are mainly inorganic nanomaterials, and organic materials are rarely seen. Therefore, it is of great signicance to construct a FeOOH nanosheet-organic composite, which is benecial for deepening the understanding of two-dimensional nanomaterials and expanding their application scope.…”