Facile synthesis of jagged Au/Ir nanochains with superior electrocatalytic activity for oxygen evolution reaction

Design-controlled synthesis of IrO2 sub-monolayers on Au nanoflowers: marrying plasmonic and electrocatalytic properties

“…The peak position and the asymmetry of the peaks evidences the presence of oxidized Ir species (Ir 4+ ) consistent 65,66 The detected shifts in the Ir peak position in the two samples were very small, and both values are close to what is observed in IrO 2 materials. [67][68][69][70] The CV profiles (described later) also are in agreement with the presence of IrO 2 . [67][68][69][70] This is important since STEM-EDS elemental mapping could not confirm whether the Ir was present as metallic Ir or IrO 2 due to oxygen signal being overwhelmed by the presence of oxygen containing surface adsorbates.…”

“…[67][68][69][70] The CV profiles (described later) also are in agreement with the presence of IrO 2 . [67][68][69][70] This is important since STEM-EDS elemental mapping could not confirm whether the Ir was present as metallic Ir or IrO 2 due to oxygen signal being overwhelmed by the presence of oxygen containing surface adsorbates. Finally, the surface composition estimated from the XPS spectra and Ir/Au ratio ( Table 1 are both higher than the from STEM-EDX and FAAS, further demonstrating that the Ir exists as a surface layer.…”

Efficient Electronic Transport in Partially Disordered Co3O4 Nanosheets for Electrocatalytic Oxygen Evolution Reaction

“…Screening efficient catalysts to overcome sluggish kinetics and reduce the overpotential is needed. , Materials based on noble metal, and their hybrids, have long been considered as the most efficient catalysts for OER. , In an acid media, the most effective OER catalysts are ruthenium- and iridium-based oxides. However, the scarcity and high material cost hinder their large-scale application. − In an alkaline media, oxides and hydroxides of first-row transition metals were found to exhibit high activity. − For instance, spinel cobalt oxide (Co 3 O 4 ) and the substituted cobaltites M x Co 3– x O 4 (M = Fe, Ni, Cu or Ce, etc.) show decent activity and may replace precious catalysts. − More importantly, the cobalt (oxy)­hydroxides were proven to be the active phase of the Co-based catalyst through both theoretical calculations and experimental results. , Moreover, Zhang et al reported gelled FeCoW oxyhydroxides with atomically homogeneous metal distribution via a room-temperature sol–gel procedure, where the adsorption of intermediate OH* can be adjusted by constructing a suitable transition-metal composition.…”

“…There are well-known strategies to enhance catalytic activity. These include alloying to modify the electronic structure, nanostructuring to enlarge specific area, and constructing a composite to combine respective advantages . Amorphous structures with uniformly distributed defectives, such as vacancies, abnormal oxidation state ions, special coordination ions, or metal ion pairs, have all been used for electrocatalyst design. ,− It is also known that the amorphous phase with a large proportion of unsaturated bonds can facilitate the adsorption of intermediate reactants .…”

Novel Composite Based on Bimetallic AuNi-Embedded Nano X Zeolite/MWCNT as a Superior Electrocatalyst for Oxygen Evolution Reaction

“…Au metal recognized by its wide electrochemical potential range and superior electrical conductivity can promote corrosion resistance of non-noble electrocatalysts by tuning the local electronic environment. 29 For example, Frydendal et al prepared highly active mixed Au−MnO x thin films with five times enhanced activity in OER over pure MnO x . X-ray absorption spectroscopy revealed that, in the presence of Au, Mn tends to have a higher oxidation state which promotes the OER process.…”