Control over fine scale terrace structures induced on polycrystalline Pd by simple heat treatments in air

Sobral, J.; Clyne, T.W.; Rezk, Rasha; Markaki, Athina E.

doi:10.1016/j.surfcoat.2017.07.071

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…This steplike surface feature suggests that the increased potassium ratio induces a stronger crystallographic anisotropy of the surface energy and an enhanced grain coarsening process during annealing. These two effects have been reported as the driving forces of terrace formation on enlarged grains, which also have a tendency for low-surface-energy planes to be exposed preferentially …”

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confidence: 96%

“…These two effects have been reported as the driving forces of terrace formation on enlarged grains, which also have a tendency for low-surface-energy planes to be exposed preferentially. 16 To investigate how potassium influences the material phase formation and crystal structures, θ−2θ Cu Kα X-ray diffraction (XRD) is measured and analyzed as shown in Figure 1b−d. Two strongest characteristic 2θ peaks occur at around 15.03°a nd 30.30°with three low-intensity peaks at 21.35°, 23.89°, and 26.59°(marked with #), which are indexed as 101/020, 202/040, 121/200/002, 031/211/112, and 022/220, respectively, in a CsPbIBr 2 perovskite with an orthorhombic unit cell referenced to CsPbBr 3 (Figure S1) having the same orthorhombic structure.…”

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confidence: 99%

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Toward Uniaxially Textured CsPbIBr₂ Perovskite Thin Films with Twin Domains by Potassium Incorporation

Guo¹,

Zhang²,

et al. 2022

ACS Energy Lett.

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With the recent success of solution-processed inorganic halide perovskites in optoelectronic applications, the ability to control crystal grain morphology, size, and orientation is of great interest to further optimize material properties and performance. Here, by tuning the cation composition of CsPbIBr 2 precursor solutions via potassium halide, we obtain uniaxially textured, smooth-surface polycrystalline thin films with a grain size of up to eight micrometers and alignment parallel to ⟨101⟩. The potassium-induced crystallization and derivative phases are analyzed. It is postulated that the conversion of nonperovskite phases to perovskite at higher temperatures relates to the observed differences in crystallization behavior in the presence of potassium halide. The lattice contraction and the band-gap enlargement are also found to suggest partial potassium incorporation into the crystal lattice. We also observe the coexistence of two types of twin domains with boundaries parallel to {121} and (010)/(101̅ ) that are optimally aligned parallel to the ⟨101⟩ transport direction in the potassium-ion-treated CsPbIBr 2 . Finally, perovskite solar cells with enhanced performance are demonstrated based on the K + -incorporated CsPbIBr 2 with a textured morphology. These findings illustrate how potassium ion incorporation can be used as a means to control the crystallinity, microstructure, and hence the device performance of inorganic lead halide perovskites CsPbIBr 2 .

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confidence: 96%

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confidence: 99%

Toward Uniaxially Textured CsPbIBr₂ Perovskite Thin Films with Twin Domains by Potassium Incorporation

Guo¹,

Zhang²,

et al. 2022

ACS Energy Lett.

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“…Second, heat treatment with succeeding cooling of Pd forms terrace arrangements and deep grooves or cracks at grain boundaries located on the surface of the Pd wires. [ 38 ] Similarly, Yule et al [ 39 ] performed flame annealing with subsequent quenching in deionized water. They identified the resulting distortions in the grain boundaries of the Pd structure as hot spots for hydrogen absorption through scanning electrochemical cell microscopy techniques.…”

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confidence: 99%

Top‐down Surfactant‐Free Synthesis of Supported Palladium‐Nanostructured Catalysts

Schott,

Schneider,

Sadraoui

et al. 2024

Small Science

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Nanostructured palladium (Pd) is a universal catalyst that is widely used in applications ranging from catalytic converters of combustion engine cars to hydrogenation catalysts in industrial processes. Standard protocols for synthesizing such nanoparticles (NPs) typically use bottom‐up approaches. They utilize special and often expensive physical techniques or wet‐chemical methods requiring organic surfactants. These surfactants should often be removed before catalytic applications. In this article, the synthesis of Pd NPs immobilized on carbon support by electrochemical erosion without using any surfactants or toxic materials is reported. The Pd NPs synthesis essentially relies on a Pd bulk pretreatment, which causes material embrittlement and allows the erosion process to evolve more efficiently, producing homogeneously distributed NPs on the support. Moreover, the synthesized catalyst is tested for hydrogen evolution reaction. The activity evaluations identify optimal synthesis parameters related to the erosion procedure. The electrocatalytic properties of the Pd NPs produced with sizes down to 6.4 ± 2.9 nm are compared with a commercially available Pd/C catalyst. The synthesized catalyst outperforms the commercial catalyst within all properties, like specific surface area, geometric activity, mass activity, specific activity, and durability.

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Experimental Study and Numerical Simulation of Y2O3 Coatings Deposited by Plasma Spraying at Different Torch Powers

Madhura,

Patel,

Vetrivendan

et al. 2023

J Therm Spray Tech

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Control over fine scale terrace structures induced on polycrystalline Pd by simple heat treatments in air

Cited by 5 publications

References 33 publications

Toward Uniaxially Textured CsPbIBr₂ Perovskite Thin Films with Twin Domains by Potassium Incorporation

Toward Uniaxially Textured CsPbIBr₂ Perovskite Thin Films with Twin Domains by Potassium Incorporation

Top‐down Surfactant‐Free Synthesis of Supported Palladium‐Nanostructured Catalysts

Experimental Study and Numerical Simulation of Y2O3 Coatings Deposited by Plasma Spraying at Different Torch Powers

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Control over fine scale terrace structures induced on polycrystalline Pd by simple heat treatments in air

Cited by 5 publications

References 33 publications

Toward Uniaxially Textured CsPbIBr2 Perovskite Thin Films with Twin Domains by Potassium Incorporation

Toward Uniaxially Textured CsPbIBr2 Perovskite Thin Films with Twin Domains by Potassium Incorporation

Top‐down Surfactant‐Free Synthesis of Supported Palladium‐Nanostructured Catalysts

Experimental Study and Numerical Simulation of Y2O3 Coatings Deposited by Plasma Spraying at Different Torch Powers

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Product

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Toward Uniaxially Textured CsPbIBr₂ Perovskite Thin Films with Twin Domains by Potassium Incorporation

Toward Uniaxially Textured CsPbIBr₂ Perovskite Thin Films with Twin Domains by Potassium Incorporation