Iridium−Rhodium Nanoparticles for Ammonia Oxidation: Electrochemical and Fuel Cell Studies

Silva, Júlio César M.; Assumpção, M.H.M.T.; Hammer, Peter; Neto, Almir Oliveira; Spinacé, Estevam V.; Baranova, Elena A.

doi:10.1002/celc.201600701

Cited by 30 publications

(13 citation statements)

References 39 publications

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“…At each selected potential, the current-time transient for 30 min was observed. In higher potentials, noisy curves appeared due to the non-homogeneous distribution of deposits on the surface of the electrode, as a result of HER [40]. Potentials were selected in the range of −1.45 to −1.60 V vs. Hg/HgO associated with the cathodic region, whereby the highest rate of deposition/dissolution close to the surface of the electrode was observed (see Figure 4a).…”

Section: B)mentioning

confidence: 99%

Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

et al. 2020

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A three-dimensional (3D) fibrous structure with a high active surface and conductive pathway proved to be an excellent anode current collector for rechargeable zinc-air batteries (ZABs). Herein, a cost-effective and highly stable zinc (Zn) electrode, based on Zn electrodeposited on iron fibers (Zn/IF), is duly examined. Electrochemical characteristics of the proposed electrode are seen to compete with a conventional zinc/nickel foam (Zn/NF) electrode, implying that it can be a suitable alternative for use in ZABs. Results show that the Zn/IF electrode exhibits an almost similar trend as Zn/NF in cyclic voltammetry (CV). Moreover, by using a Zn/IF electrode, electrochemical impedance spectroscopy (EIS) demonstrates lower charge transfer resistance. In the application of a rechargeable ZAB, the fibrous Zn/IF electrode exhibits a high coulombic efficiency (CE) of 78%, close to the conventional Zn/NF (80%), with almost similar capacity and lower charge transfer resistance, after 200 charge/discharge cycles. It is evident that all the positive features of Zn/IF, especially its low cost, shows that it can be a valuable anode for ZABs.

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Section: B)mentioning

confidence: 99%

Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

et al. 2020

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“…The spin separations of the Rh 3d for both pure Rh and alloyed Rh–Ir are measured to be 3.0 eV which is characteristic of the metallic Rh. The intensity at 312 eV comes from the overlap of Rh 3d 3/2 with Ir 4d 3/2 39 , 40 . The other values observed at 309 and 314 eV for pure and alloyed samples are consistent with the oxidized species which are attributed to surface oxidation under ambient conditions.…”

Section: Resultsmentioning

confidence: 99%

Noble metal alloy thin films by atomic layer deposition and rapid Joule heating

Guo

Zou

Cheng

et al. 2022

Sci Rep

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Metal alloys are usually fabricated by melting constituent metals together or sintering metal alloy particles made by high energy ball milling (mechanical alloying). All these methods only allow for bulk alloys to be formed. This manuscript details a new method of fabricating Rhodium–Iridium (Rh–Ir) metal alloy films using atomic layer deposition (ALD) and rapid Joule heating induced alloying that gives functional thin film alloys, enabling conformal thin films with high aspect ratios on 3D nanostructured substrate. In this work, ALD was used to deposit Rh thin film on an Al2O3 substrate, followed by an Ir overlayer on top of the Rh film. The multilayered structure was then alloyed/sintered using rapid Joule heating. We can precisely control the thickness of the resultant alloy films down to the atomic scale. The Rh–Ir alloy thin films were characterized using scanning and transmission electron microscopy (SEM/TEM) and energy dispersive spectroscopy (EDS) to study their microstructural characteristics which showed the morphology difference before and after rapid Joule heating and confirmed the interdiffusion between Rh and Ir during rapid Joule heating. The diffraction peak shift was observed by Grazing-incidence X-ray diffraction (GIXRD) indicating the formation of Rh–Ir thin film alloys after rapid Joule heating. X-ray photoelectron spectroscopy (XPS) was also carried out and implied the formation of Rh–Ir alloy. Molecular dynamics simulation experiments of Rh–Ir alloys using Large-Scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) were performed to elucidate the alloying mechanism during the rapid heating process, corroborating the experimental results.

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“…The spin separations of the Rh3d for both pure Rh and alloyed Rh/Ir are measured to be 3.0 eV which is characteristic of the metallic Rh. The intensity at 312 eV comes from the overlap of Rh3d 3/2 with Ir 3d 3/2 34 . The other values observed at 309 and 314 eV for pure and alloyed samples are consistent with the oxidized species which are attributed to surface oxidation under ambient conditions.…”

Section: Resultsmentioning

confidence: 99%

Noble Metal Alloy Thin Films by Atomic Layer Deposition & Rapid Joule Heating

Guo¹,

Zou²,

Cheng³

et al. 2021

Preprint

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Metal alloys are usually fabricated by melting constituent metals together or sintering metal alloy particles made by high energy ball milling (mechanical alloying). All these methods only allow for bulk alloys to be formed. This manuscript details a new method of fabricating Rhodium/Iridium (Rh/Ir) metal alloy films using atomic layer deposition (ALD) and rapid Joule heating induced alloying that gives functional thin film alloys, enabling conformal thin films with high aspect ratios on 3D nanostructured substrate. In this work, ALD was used to deposit Rh thin film on an Al2O3 substrate, followed by an Ir overlayer on top of the Rh film. The multilayered structure was then alloyed / sintered using rapid Joule heating. We can precisely control the thickness of the resultant alloy films down to the atomic scale. The Rh@Ir alloy thin films were characterized using scanning and transmission electron microscopy (SEM/TEM) and energy dispersive spectroscopy (EDS) to study their microstructural characteristics. Grazing-incidence X-ray diffraction (GIXRD) and X-ray photoelectron spectroscopy (XPS) were also carried out to confirm the composition and formation of Rh-Ir thin film alloys. All the characterization results reveal that the Rh-Ir alloy thin film was prepared successfully with one single phase and homogeneous distribution of Rh and Ir throughout the film. Molecular Dynamics simulation experiments of Rh/Ir alloys using Large-Scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) were performed to elucidate the alloying mechanism during the rapid heating process, corroborating the experimental results.

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Iridium−Rhodium Nanoparticles for Ammonia Oxidation: Electrochemical and Fuel Cell Studies

Cited by 30 publications

References 39 publications

Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

Noble metal alloy thin films by atomic layer deposition and rapid Joule heating

Noble Metal Alloy Thin Films by Atomic Layer Deposition & Rapid Joule Heating

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Iridium−Rhodium Nanoparticles for Ammonia Oxidation: Electrochemical and Fuel Cell Studies

Cited by 30 publications

References 39 publications

Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

Three-Dimensional Fibrous Iron as Anode Current Collector for Rechargeable Zinc–Air Batteries

Noble metal alloy thin films by atomic layer deposition and rapid Joule heating

Noble Metal Alloy Thin Films by Atomic Layer Deposition &amp; Rapid Joule Heating

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Product

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Noble Metal Alloy Thin Films by Atomic Layer Deposition & Rapid Joule Heating