Benchmarking Pt and Pt-lanthanide sputtered thin films for oxygen electroreduction: fabrication and rotating disk electrode measurements

Zamburlini, Eleonora; Jensen, Kim Degn; Stephens, Ifan E. L.; Chorkendorff, Ib; Escudero-Escribano, Marı́a

doi:10.1016/j.electacta.2017.06.146

Cited by 42 publications

(55 citation statements)

References 90 publications

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“…This sample, contrary to the rotated Gd/Pt(111) R 30 sample, had not been subjected to destructively high potentials because the potential was kept below 1.0 V vs. RHE all the time during the in situ XRD measurements on the Gd/Pt(111) R 0 sample. The electrochemical experiments on Gd/Pt(111) R 0 were performed in a rotating ring‐disk electrode (RRDE) three‐electrode setup with a gas bubbler allowing the changing the gas saturated into the acidic electrolyte . For specific details on the electrochemical tests, see the Experimental Section.…”

Section: Resultsmentioning

confidence: 90%

“…The features corresponding to both H adsorption (in the potential region from 0.05 to 0.45 V vs. RHE) and OH adsorption (from 0.55 to 1.00 V vs. RHE) are shown in Figure a as sketched areas. We evaluated the charge corresponding to the H adsorption region following the methodology described in our earlier works . Figure a shows a considerable suppression of the H and OH adsorption regions for the Gd/Pt(111) R 0* alloy as compared to Pt(111), suggesting extensive weakening of both H and OH binding energies to the surface .…”

Section: Resultsmentioning

confidence: 99%

“…The results from Figure and Table reveal a considerable shift in the OH absorption potential for Gd/Pt(111) relative to Pt(111), indicating a significant weakening of the OH binding energy, in agreement with the ORR Sabatier volcano relationship . Moreover, Table shows that the H adsorption region is suppressed for Gd/Pt(111) R 0* relative to Pt(111), the extent of this suppression decreasing after the stability test. Notably, the Gd/Pt(111) R 0* system exhibits less than 2 % difference in specific kinetic current density before and after the stability test.…”

Section: Resultsmentioning

confidence: 99%

“…Our density functional theory (DFT) calculations suggested that the thick Pt overlayer would correspond to a closely packed Pt overlayer under compressive strain . More recently, we investigated Pt x Y and Pt x Gd nanoparticulate catalysts of these alloys . Extended X‐ray absorption fine structure (EXAFS) measurements showed that mass‐selected Pt x Y and Pt x Gd nanoparticles were under compressive strain, even after carrying out ORR measurements.…”

Section: Introductionmentioning

confidence: 99%

“…[32] More recently,w ei nvestigated Pt x Ya nd Pt x Gd nanoparticulate catalysts of these alloys. [38][39][40] Extended X-ray absorption fine structure (EXAFS) measurements showed that mass-selected Pt x Y and Pt x Gd nanoparticles were under compressive strain, even after carrying out ORR measurements. Furthermore, their specific activity exhibited an exponentiald ependencew ith the compressive strain; [38] this result is in agreement with the formation of ac ompressed Pt shell, which would cause the weakening of the OH binding energy.…”

Section: Introductionmentioning

confidence: 99%

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Active‐Phase Formation and Stability of Gd/Pt(111) Electrocatalysts for Oxygen Reduction: An In Situ Grazing Incidence X‐Ray Diffraction Study

Escudero-Escribano

Pedersen

Ulrikkeholm

et al. 2018

Chemistry A European J

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Alloys of platinum and gadolinium present significant activity enhancement over pure Pt for the oxygen reduction reaction (ORR), both in the form of extended electrode surfaces and nanoparticulate catalysts. The active phase consists of a compressed Pt overlayer formed on Pt Gd electrodes upon exposure to the electrolyte by acid leaching. Here, we investigate the formation, strain and correlation lengths of the active Pt overlayer by using in situ synchrotron grazing incidence X-ray diffraction on Gd/Pt(111) single-crystalline electrodes. The overlayer forms upon exposure to electrolyte under open circuit conditions; the compressive strain relaxes slightly upon repeated electrochemical cycling in the potential range 0.6 to 1.0 V versus the reversible hydrogen electrode (RHE). In addition, the strain relaxes strongly when exposing the electrode to 1.2 V versus RHE, and the thickness of the crystalline portion of the overlayer increases with potential above 1.3 V versus RHE.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Active‐Phase Formation and Stability of Gd/Pt(111) Electrocatalysts for Oxygen Reduction: An In Situ Grazing Incidence X‐Ray Diffraction Study

Escudero-Escribano

Pedersen

Ulrikkeholm

et al. 2018

Chemistry A European J

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Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)

et al. 2018

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In the face of the global energy challenge and progressing global climate change, renewable energy systems and components, such as fuel cells and electrolyzers, which close the energetic oxygen and carbon cycles, have become a technology development priority. The electrochemical oxygen reduction reaction (ORR) and the direct electrochemical carbon dioxide reduction reaction (CO2RR) are important electrocatalytic processes that proceed at gas diffusion electrodes of hydrogen fuel cells and CO2 electrolyzers, respectively. However, their low catalytic activity (voltage efficiency), limited long‐term stability, and moderate product selectivity (related to their Faradaic efficiency) have remained challenges. To address these, suitable catalysts are required. This review addresses the current state of research on Pt‐based and Cu‐based nanoalloy electrocatalysts for ORR and CO2RR, respectively, and critically compares and contrasts key performance parameters such as activity, selectivity, and durability. In particular, Pt nanoparticles alloyed with transition metals, post‐transition metals and lanthanides, are discussed, as well as the material characterization and their performance for the ORR. Then, bimetallic Cu nanoalloy catalysts are reviewed and organized according to their main reaction product generated by the second metal. This review concludes with a perspective on nanoalloy catalysts for the ORR and the CO2RR, and proposes future research directions.

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Atomic Heterointerface Boosts the Catalytic Activity toward Oxygen Reduction/Evolution Reaction

Yang

Yin

et al. 2021

Advanced Energy Materials

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Representatively, the ORR/ OER delivers the discharge/charge process of both aqueous Zn-air batteries and aprotic Li-air batteries which are promising power source candidates for prevailing portable devices and electric vehicles. [7][8][9][10][11][12][13][14] However, the sluggish kinetics of molecular oxygen electrocatalytic reduction and evolution lead to high overpotentials, poor rate capability and short cycle life, severely hampering the widespread implementation of these systems. [15][16][17] Exploring efficient and stable electrocatalysts for ORR/OER is crucial to overcome these issues. [18,19] Currently, there exist difficulties to find a favorable electrocatalyst to stimulate both reactions because elegant OER catalysts usually exhibit poor catalytic activity toward ORR and vice versa.The representative examples are single atoms catalysts (SACs) and layered double hydroxides (LDHs). [20][21][22] There has been significant progress on SACs and LDHs with successfully exploration of various catalysts, such as MnNC, [23] Fe SAs/NC, [24] CoAl LDH, [25] and CoNiFe LDH, [26,27] etc.; however, SACs and LDHs exhibit dedicated catalytic activity toward ORR and OER, respectively. Take the noble metal catalysts for another example, Ru and Ir based materials are prominent OER catalysts while poor for ORR. Oppositely, Pt based materials are elegant toward ORR but poor for OER. Interface engineering is an efficient strategy to enhance the electrocatalytic activity of hybrid materials by taking advantage of the synergistic effect of double or even multiple active sites. Here, the rational design of a Pd/NiO atomic interface with well patterned Pd arrays imbedded into NiO thin films are reported to boost the catalytic activity toward the oxygen reduction/ evolution reaction. Theoretical analysis elucidates that the Pd (111)/NiO (111) interface with minimized lattice mismatch effectively adsorbs intermediates (OH * , LiO 2 * , Li 2 O 2 * , and Li 2 O * ) and induces the growth/decomposition of electrochemical reaction products, which greatly lowers the Gibbs energy barrier of crucial steps and boosts the reaction kinetics. As expected, such hybrid thin films exhibit high catalytic activity for both the oxygen reduction reaction and oxygen evolution reaction, with performance comparable to the benchmarked Pt/C and RuO 2 catalysts. Moreover, favorable performance is also achieved in both aqueous Zn-air batteries and aprotic Li-air batteries with an overpotential of only 0.69 and 0.50 V, respectively. This work suggests the great potential of such particularly morphological hybrid thin films in the development of high-performance catalysts for energy storage and conversion.

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Benchmarking Pt and Pt-lanthanide sputtered thin films for oxygen electroreduction: fabrication and rotating disk electrode measurements

Cited by 42 publications

References 90 publications

Active‐Phase Formation and Stability of Gd/Pt(111) Electrocatalysts for Oxygen Reduction: An In Situ Grazing Incidence X‐Ray Diffraction Study

Active‐Phase Formation and Stability of Gd/Pt(111) Electrocatalysts for Oxygen Reduction: An In Situ Grazing Incidence X‐Ray Diffraction Study

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)

Atomic Heterointerface Boosts the Catalytic Activity toward Oxygen Reduction/Evolution Reaction

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Benchmarking Pt and Pt-lanthanide sputtered thin films for oxygen electroreduction: fabrication and rotating disk electrode measurements

Cited by 42 publications

References 90 publications

Active‐Phase Formation and Stability of Gd/Pt(111) Electrocatalysts for Oxygen Reduction: An In Situ Grazing Incidence X‐Ray Diffraction Study

Active‐Phase Formation and Stability of Gd/Pt(111) Electrocatalysts for Oxygen Reduction: An In Situ Grazing Incidence X‐Ray Diffraction Study

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO2RR)

Atomic Heterointerface Boosts the Catalytic Activity toward Oxygen Reduction/Evolution Reaction

Contact Info

Product

Resources

About

Alloy Nanocatalysts for the Electrochemical Oxygen Reduction (ORR) and the Direct Electrochemical Carbon Dioxide Reduction Reaction (CO₂RR)