Synthesis and Characterization of Ru‐Loaded Anodized Aluminum Oxide for Hydrogenation Catalysis

Vandekerkhove, Annelies; Negahdar, Leila; Glas, Daan; Stassen, Ivo; Matveev, Serguei; Meeldijk, Johannes D.; Meirer, Florian; Vos, Dirk De; Weckhuysen, Bert M.

doi:10.1002/open.201900091

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…Though AAO has significant history, its fabrication process and applications remain of current interest [ 3 ]. Researchers have refined AAO nanopore engineering and modification for various applications like sensors [ 4 ], catalysis [ 5 , 6 ], and wear [ 7 , 8 ]. MoS 2 , existing naturally in the form of molybdenite, has been used as a lubricant for various materials for decades [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Correlation of Fabrication Methods and Enhanced Wear Performance in Nanoporous Anodic Aluminum Oxide with Incorporated Molybdenum Disulfide (MoS2) Nanomaterials

Hatfield,

Brown,

Dervishi

et al. 2024

Nanomaterials

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Wear performance is integral to component longevity, minimizing industrial waste and excess energy costs in a wide variety of applications. Anodized aluminum oxide (AAO) has many beneficial properties leading to its wide use across industries as a surface treatment for many aluminum components, but the wear properties of the coating could be improved significantly. Here, we used an electrochemical method to incorporate molybdenum disulfide (MoS2), a nanomaterial used as a dry lubricant, to modify alloys of aluminum during AAO preparation. Using Raman spectroscopy and tribological scratch measurements, we thoroughly characterized the structure and wear behavior of the films. The MoS2 deposition procedure was optimal on aluminum 5052 anodized in higher acid concentrations, with friction coefficients at around 0.05 (~10× better than unmodified AAO). Changing anodization conditions to produce harder films with smaller pores led to worsened wear properties, likely because of lower MoS2 content. Studying a commercial MoS2/AAO film of a different Al alloy (7075) showed that a heat treatment step intended to fully convert all deposited MoSx species to MoS2 can adversely affect wear in some alloys. While Al 6061 and 1100 produced films with worse wear performance compared to Al 5052 or 7075, our results show evidence that acid cleaning after initial anodization likely removes residual alloying elements, affecting MoS2 incorporation. This study demonstrates a nanomaterial modified AAO film with superior wear characteristics to unmodified AAO and relates fabrication procedure, film structure, and practical performance.

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Section: Introductionmentioning

confidence: 99%

Correlation of Fabrication Methods and Enhanced Wear Performance in Nanoporous Anodic Aluminum Oxide with Incorporated Molybdenum Disulfide (MoS2) Nanomaterials

Hatfield,

Brown,

Dervishi

et al. 2024

Nanomaterials

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Cobalt‐Sputtered Anodic Aluminum Oxide Membrane for Efficient Photothermal CO₂ Hydrogenation

Lou

Fang

et al. 2021

ChemNanoMat

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The rational design of nanoarray‐structured catalysts is an accessible way to increase light absorption ability and boost photothermal CO2 conversion efficiency. However, practical application of current nanoarrays is hindered by complex synthesis procedures, high costs, and low catalyst yields. Herein, we report a simple, robust method to prepare efficient photothermal catalyst by sputtering Co nanoparticles on commercial anodic aluminum oxide (AAO) membrane. The detailed study shows that gas diffusion and catalytic activity can be affected by AAO structures, such as channel size and shape. The optimized Co@dpAAO catalyst reached a record Co‐based photothermal CO2 conversion rate of 1666 mmol ⋅ gCo−1 ⋅ h−1. This study not only provides a facile way to synthesize efficient catalysts, but also promotes the understanding of constructing nanoarray‐based photothermal catalysts.

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Anodic aluminum oxide-membrane prepared in electrolyte “oxalic acid – matter with carbon nanodots”

Кudelko¹,

Rozhdestvenska²,

Ponomarova³

et al. 2023

Him. Fiz. Tehnol. Poverhni

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Anodic porous alumina has been studied and used as nanoscale structure, coating, template in different applications. The porous anodic alumina oxide could be described as numerous hexagonal cells and looks like cellular structure. In this work we report about results of study anodizing of aluminum with usage of electrolyte: “oxalic acid electrolyte-matter with carbon nanodots”. It was received anodic aluminum oxide-membrane with aluminum supporting; calcination was used as post treatment. The aluminum substrate allows one to fix the membrane in the cells. Methods: processes of anodizing was provided in 0.3M oxalic acid with addition of colloid system of carbon nanodots, temperature of process was controlled at range of 10 degree Celsius, aluminum foil (anode) and platinum plate (cathode) were used; thickness of aluminum foil was 0.1 µm; morphology and structure of anodic aluminum oxide-membrane were determined with usage of electron scanning microscope; the contact angle between the surface of anodic aluminum oxide-membrane and deionized water was measured with “drop” methodology. Calcium content was monitored with a conductometer. The content of proteins was determined with photometry (micro Lowry’s method). It was found that contact angle of the surface of anodic aluminum oxide-membrane obtained in electrolyte “oxalic acid-matter with carbon nanodots” and deionized water is 38 degrees. Adding colloidal system of carbon nanodots to the acid electrolyte acts as a hydrophilizer, changes the size of the porous surface: as a result, it is possible to control the porosity of the films. Calcination of anodic aluminum oxide-membrane at 500 degree Celsius lead to expansion and thinning of pore walls. Anodic aluminum oxide-membrane was tested for dialysis process for milk whey separation. The membrane obtained in electrolyte: “oxalic acid-matter with carbon nanodots” showed a greater degree of rejection of protein particles in comparison with a similar membrane obtained in electrolyte of oxalic acid. The advantage of using carbon nanodots in acid electrolyte is the simplicity and environmental friendliness of the synthesis. The approach, which involves the addition of a colloidal system with carbon nanomaterial, allows one to avoid using a strongly acidic electrolyte for obtaining membranes with smaller pores. One of the ways for using of anodic oxide aluminum-membrane is the dialysis of biological fluids, for example, milk whey.

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Synthesis and Characterization of Ru‐Loaded Anodized Aluminum Oxide for Hydrogenation Catalysis

Cited by 4 publications

References 24 publications

Correlation of Fabrication Methods and Enhanced Wear Performance in Nanoporous Anodic Aluminum Oxide with Incorporated Molybdenum Disulfide (MoS2) Nanomaterials

Correlation of Fabrication Methods and Enhanced Wear Performance in Nanoporous Anodic Aluminum Oxide with Incorporated Molybdenum Disulfide (MoS2) Nanomaterials

Cobalt‐Sputtered Anodic Aluminum Oxide Membrane for Efficient Photothermal CO₂ Hydrogenation

Anodic aluminum oxide-membrane prepared in electrolyte “oxalic acid – matter with carbon nanodots”

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Synthesis and Characterization of Ru‐Loaded Anodized Aluminum Oxide for Hydrogenation Catalysis

Cited by 4 publications

References 24 publications

Correlation of Fabrication Methods and Enhanced Wear Performance in Nanoporous Anodic Aluminum Oxide with Incorporated Molybdenum Disulfide (MoS2) Nanomaterials

Correlation of Fabrication Methods and Enhanced Wear Performance in Nanoporous Anodic Aluminum Oxide with Incorporated Molybdenum Disulfide (MoS2) Nanomaterials

Cobalt‐Sputtered Anodic Aluminum Oxide Membrane for Efficient Photothermal CO2 Hydrogenation

Anodic aluminum oxide-membrane prepared in electrolyte “oxalic acid – matter with carbon nanodots”

Contact Info

Product

Resources

About

Cobalt‐Sputtered Anodic Aluminum Oxide Membrane for Efficient Photothermal CO₂ Hydrogenation