Electrocatalysis of Hydrogen Evolution Reaction on Au(111) by Spontaneously Deposited Iridium in Acid Solution

Štrbac, Svetlana; Srejić, Irina; Rakočević, Zlatko Lj.

doi:10.1149/2.0441815jes

Cited by 18 publications

(9 citation statements)

References 37 publications

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“…The suppression of the H upd peaks becomes more pronounced as the Ir coverage increases which indicates increasing inaccessibility of the Pt surface for the adsorption of H upd species. The explanation for the suppression of the H upd peaks can be found in the presence of non-metallic Ir species on top of Pt(poly), similarly like in the case of Ir/Au(111) electrodes [38]. This assumption is in line with the discussion about the XPS spectra of Ir/Pt(poly) electrode (see Fig.…”

Section: Electrochemical Characterization Of Ir/pt(poly) Electrodessupporting

confidence: 77%

“…[50]), confirming the analysis above according to which Ir is spontaneously deposited on Pt as a mixture of metallic Ir and IrOx species. In contrast to this case, when Ir is spontaneously deposited from the same solution on Au as substrate, the deposit consists of IrCl 3 and IrOx, but no metallic Ir [38].…”

Section: Xps Spectra Of Ir/pt(poly))surfacementioning

confidence: 88%

“…The fact that spontaneously deposited Ir-oxide species are not completely reduced after recording of the cyclic voltammograms in the given potential limits preceded by the potential holding also indicate the presence of non-reducible IrOx as suggested earlier in ref. [38]. As a consequence of the suppression of H upd peaks EASA cannot be calculated from the charge under the H upd peaks, which is otherwise used for EASA determination of both bare Pt(poly) and Ir(poly) [56].…”

Section: Electrochemical Characterization Of Ir/pt(poly) Electrodesmentioning

confidence: 99%

“…Concerning the HER, there are several examples where Ir was used to modify Ni-based catalysts and a tendency of approaching the activity of Pt for HER was observed [35][36][37]. More recently, our group has shown that Ir/Au(111) structures prepared by the spontaneous deposition exhibited pronounced HER activity in an alkaline solution [38]. These studies showing that Ir can be successfully applied in HER electrocatalysis on model bimetallic electrodes and the mentioned lack of corresponding literature for Ir/Pt structures impose a logical and rather appealing task to investigate HER on bimetallic Ir/Pt catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen evolution reaction on bimetallic Ir/Pt(poly) electrodes in alkaline solution

Štrbac

Smiljanić

Wakelin

et al. 2019

Electrochimica Acta

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Hydrogen evolution reaction (HER) was studied in alkaline solution on Pt(poly) electrode modified by spontaneously deposited Ir nanoislands. Comprehensive insight into the characteristics of the bimetallic Ir/Pt(poly) catalysts was obtained by a combination of Atomic Force Microscopy (AFM), Field Emission Scanning Electron Microscopy (FESEM), X-ray Photoelectron Spectroscopy (XPS) and classical electrochemical techniques. HER investigations have shown that the presence of spontaneously deposited Ir enhances the activity of bare Pt(poly)in alkaline solution. This was attributed to the heterogeneity of the active surface sites and to the electronic interaction between two metals in close contact which together facilitated the adsorption of the H intermediate species.

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Section: Electrochemical Characterization Of Ir/pt(poly) Electrodessupporting

confidence: 77%

Section: Xps Spectra Of Ir/pt(poly))surfacementioning

confidence: 88%

Section: Electrochemical Characterization Of Ir/pt(poly) Electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogen evolution reaction on bimetallic Ir/Pt(poly) electrodes in alkaline solution

Štrbac

Smiljanić

Wakelin

et al. 2019

Electrochimica Acta

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“…The interface was atomically sharp in both cases. In the experiment by Štrbac et al [42] after short deposition time, a coverage of the Au(111) surface with Ir was achieved with deposited islands of one to four MLs high. The lateral size of the deposited Ir islands ranged from 10 to 25 nm.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit splitting of quantum well states in n -monolayer Ir/Au(111) heterostructures

et al. 2020

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The effect of spin-orbit coupling on quantum well states (QWSs) in atomically thin Ir adlayers deposited on the Au(111) substrate is studied in the framework of the density functional theory. Varying the Ir film thickness from 1 to 3 atomic layers, we find numerous Ir-derived QWSs, which are mainly of d character. The resulting band dispersion of QWSs appearing around the surface Brillouin zone center in a wide Au(111) energy gap is analyzed in the framework of the Rashba model. In all such QWSs, the fitted values of the Rashba parameter exceed 2 eV Å. The maximal value of 6.4 eV Å was obtained for the 1-monolayer-Ir/Au(111) system. We explain such large spin splitting by hybridization between different QWSs. Strong enhancement is observed in the density of electronic states at the surface in the energy region around the Fermi level caused by these QWSs.

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Searching for an Optimal Multi‐Metallic Alloy Catalyst by Active Learning Combined with Experiments

Kim

Jung

et al. 2022

Advanced Materials

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However, determining the optimum elemental components and composition is challenging because of the different physical behaviors and chemical activities of the metal elements in catalytic reactions. Furthermore, it is difficult to determine the metal combination that must be investigated as it is difficult to exactly determine which metal element will affect the catalytic performance within the alloy. Before the introduction of computational techniques, researchers have mainly investigated binary and ternary alloys, with the focus on searching for high-performance multi-metallic catalysts by experimental trial and error. [8][9][10] For example, noble and non-noble metals, for example, platinum (Pt), [11][12][13] ruthenium (Ru), [14,15] iridium (Ir), [16,17] palladium (Pd), [18,19] and nickel (Ni), [20] iron (Fe), [21] cobalt (Co), [22] molybdenum (Mo), [23] as well as their alloys, are typically used in the hydrogen evolution reaction (HER), rendering the dimensionality of the space of alloy composition candidates far beyond human intuition or brute-force search by trial and error. However, it was almost impossible to search for the optimal component and composition for high-performance catalysts as the determination of the catalyst performance is a timeconsuming and expensive process due to the enormous number of candidate combinations and compositions.Searching for an optimal component and composition of multi-metallic alloy catalysts, comprising two or more elements, is one of the key issues in catalysis research. Due to the exhaustive data requirement of conventional machine-learning (ML) models and the high cost of experimental trials, current approaches rely mainly on the combination of density functional theory and ML techniques. In this study, a significant step is taken toward overcoming limitations by the interplay of experiment and active learning to effectively search for an optimal component and composition of multi-metallic alloy catalysts. The active-learning model is iteratively updated using by examining electrocatalytic performance of fabricated solid-solution nanoparticles for the hydrogen evolution reaction (HER). An optimal metal precursor composition of Pt 0.65 Ru 0.30 Ni 0.05 exhibits an HER overpotential of 54.2 mV, which is superior to that of the pure Pt catalyst. This result indicates the successful construction of the model by only utilizing the precursor mixture composition as input data, thereby improving the overpotential by searching for an optimal catalyst. This method appears to be widely applicable since it is able to determine an optimal component and composition of electrocatalyst without obvious restriction to the types of catalysts to which it can be applied.

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Electrocatalysis of Hydrogen Evolution Reaction on Au(111) by Spontaneously Deposited Iridium in Acid Solution

Cited by 18 publications

References 37 publications

Hydrogen evolution reaction on bimetallic Ir/Pt(poly) electrodes in alkaline solution

Hydrogen evolution reaction on bimetallic Ir/Pt(poly) electrodes in alkaline solution

Spin-orbit splitting of quantum well states in n -monolayer Ir/Au(111) heterostructures

Searching for an Optimal Multi‐Metallic Alloy Catalyst by Active Learning Combined with Experiments

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