Development of Ti/TiOx foams for removal of organic pollutants from water: Influence of porous structure of Ti substrate

Ma, Jing; Trellu, Clément; Oturan, Nihal; Raffy, Stéphane; Oturan, Mehmet A.

doi:10.1016/j.apcatb.2022.121736

Cited by 20 publications

(3 citation statements)

References 51 publications

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“…Among the most interesting attributes of nanofoams is their low mass density, typically falling within the range of 1-100 mg cm À3 . This, in combination with a very high surface-tovolume ratio, makes nanofoams interesting for a broad range of applications, including supercapacitor devices, [1,2] energy storage, [3,4] hydrogen storage, [5,6] advanced catalysis, [7,8] solar energy conversion, [9,10] pollutant removal, [11,12] gas sensing, [13,14] and nanomedicine. [15,16] In the past years, nanofoams have been studied as effective enhancers in high-intensity laser-matter interaction [17] for laser-driven ion acceleration, [18][19][20][21] neutron [22] and radioisotopes generation, [23] and inertial confinement fusion.…”

Section: Introductionmentioning

confidence: 99%

Versatile Synthesis of Nanofoams through Femtosecond Pulsed Laser Deposition

Orecchia,

Maffini,

Zavelani‐Rossi

et al. 2024

Small Structures

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Nanofoam materials are gaining increasing interest in the scientific community, thanks to their unique properties such as ultralow density, complex nano‐ and microstructure, and high surface area. Nanofoams are attractive for multiple applications, ranging from advanced catalysis and energy storage to nuclear fusion and particle acceleration. The main issues hindering the widespread use of nanofoams are related to the choice of synthesis technique, highly dependent on the desired elemental composition and leading to a limited control over the main material properties. Herein, femtosecond pulsed laser deposition is proposed as a universal tool for the synthesis of nanofoams with tailored characteristics. Nanofoams made by elements with significantly different properties—namely, boron, silicon, copper, tungsten, and gold—can be produced by suitably tuning the deposition parameters. The effect of the background pressure is studied in detail, in relation to the morphological features and density of the resulting nanofoams and nanostructured films. This, together with the analysis of the specific features shown by nanofoams made of different elements, offers fresh insights into the aggregation process and its relation to the corresponding nanofoam properties down to the nanoscale, opening new perspectives toward the application of nanofoam‐based materials.

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Section: Introductionmentioning

confidence: 99%

Versatile Synthesis of Nanofoams through Femtosecond Pulsed Laser Deposition

Orecchia,

Maffini,

Zavelani‐Rossi

et al. 2024

Small Structures

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“…The gap arises from the complex integration of mass transfer and electrochemical reactions in the spatially confined pores. One of the most crucial factors determining the performance of REMs is the pore diameter, which directly relates to the mass transfer 21 , 22 and electrochemical properties 8 , 23 . However, reported REMs differ from each other in terms of catalysts and pore geometry, making it almost impossible to quantitatively assess the impact of pore diameter.…”

Section: Introductionmentioning

confidence: 99%

Unveiling the spatially confined oxidation processes in reactive electrochemical membranes

Kang,

Gu,

et al. 2023

Nat Commun

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Electrocatalytic oxidation offers opportunities for sustainable environmental remediation, but it is often hampered by the slow mass transfer and short lives of electro-generated radicals. Here, we achieve a four times higher kinetic constant (18.9 min−1) for the oxidation of 4-chlorophenol on the reactive electrochemical membrane by reducing the pore size from 105 to 7 μm, with the predominate mechanism shifting from hydroxyl radical oxidation to direct electron transfer. More interestingly, such an enhancement effect is largely dependent on the molecular structure and its sensitivity to the direct electron transfer process. The spatial distributions of reactant and hydroxyl radicals are visualized via multiphysics simulation, revealing the compressed diffusion layer and restricted hydroxyl radical generation in the microchannels. This study demonstrates that both the reaction kinetics and the electron transfer pathway can be effectively regulated by the spatial confinement effect, which sheds light on the design of cost-effective electrochemical platforms for water purification and chemical synthesis.

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“…In the EF process, homogeneous • OH radicals (E. 0 OH/H2O = 2.8 V/SHE) are generated electrocatalytically in the bulk solution through Fenton's reaction [4,5,7,16]. On the other side, the anodic oxidation (AO) process provides heterogeneous • OH radicals on the surface of anodes with high O2 evolution overvoltage [17,18] . The AO processes belong to direct electrooxidation and usually involves the mass transfer limitation [19,20].…”

Section: Introductionmentioning

confidence: 99%