Dataset Information

Laser Shock Fabrication of Nitrogen Doped Inverse Spinel Fe₃O₄/Carbon Nanosheet Film Electrodes towards Hydrogen Evolution Reactions in Alkaline Media.

ABSTRACT: The reliable and cost-effective production of high-performance film electrodes for hydrogen evolution reactions remains a challenge for the laser surface modification community. In this study, prior to a thermal imidization reaction, a small number of Fe₃O₄ nanoparticles were vortexed into a poly(amic acid) (PAA) prepolymer, and the achieved flat composite film was then ablated by a 1064 nm fiber laser. After laser irradiation, the hierarchical architectures of carbon nanosheets decorated with Fe₃O₄ nanoparticles were generated. Although pure polyimide (PI) film and laser carbonized PI film, as well as bare Fe₃O₄, showcase poor intrinsic catalytic activity toward alkaline hydrogen evolution reactions, our laser-derived Fe₃O₄/carbon nanosheet hybrid film demonstrated enhanced electrocatalytic activity and stability in 1 M KOH electrolyte; the overpotential(η₁₀) reached 247 mV when the current density was 10 mA cm^-2 with a slight current decay in the chronoamperometric examination of 12 h. Finally, we proposed that the substitution of N to O in Fe-O sites of trans spinel structured magnetite would be able to modulate the free energy of hydrogen adsorption (ΔG_H*) and accelerate water dissociation.

SUBMITTER: Wu D

PROVIDER: S-EPMC9267510 | biostudies-literature | 2022 Jul

REPOSITORIES: biostudies-literature

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Laser Shock Fabrication of Nitrogen Doped Inverse Spinel Fe3O4/Carbon Nanosheet Film Electrodes towards Hydrogen Evolution Reactions in Alkaline Media.

Wu Dun D Zhao Jiaming J Cheng Junfeng J Liu Chunlin C Wang Qiang Q

International journal of molecular sciences 20220705 13

The reliable and cost-effective production of high-performance film electrodes for hydrogen evolution reactions remains a challenge for the laser surface modification community. In this study, prior to a thermal imidization reaction, a small number of Fe3O4 nanoparticles were vortexed into a poly(amic acid) (PAA) prepolymer, and the achieved flat composite film was then ablated by a 1064 nm fiber laser. After laser irradiation, the hierarchical architectures of carbon nanos ...[more]

PMID: 35806484

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Project description:An electrodeposition technique of low-enriched uranium onto boron-doped diamond (BDD) electrodes for uranium electro-assembling, sequestration, uranium electrowinning (as the electroextraction alternative), and future neutron detection applications has been developed. Our findings through physicochemical characterization and an in-depth XPS analysis show that the U/BDD system consists of a blend of uranium oxides with IV, V, and VI oxidation states. Results show that U5+ is present and stable under open atmospheric conditions. The U electrodeposition on BDD creates smooth surfaces, free of voids, with uniform deposition of homogeneous tiny particles of stable uranium oxides, instead of chunky particles, and uranium compound mixtures, like large fibers of the precursor uranyl. Our electrochemical method operates without high temperatures or hazardous compounds. Uranium corrosion and oxidation processes occur spontaneously and parallel to the electrochemical formation of metallic uranium on BDD electrode surfaces, with metallic uranium reacting with water, producing fine particles of UO2. This work represents the first attempt to create a surface of uranium oxides, where the film thickness can be controlled for future applications, e.g., improving sensitivity in neutron detection technologies. Our U electro-assembling method provides a sustainable strategy for uranium electro-recovery from nuclear wastes, immobilizing uranium as a storage method or as U-film fabrication (U/BDD) for future neutron detection applications. Besides, this work contributes to uranium-based technologies, improving them and providing a better understanding of their electrochemical properties, e.g., uranium redox processes, uranium oxides' formation, and stability evaluation. These properties are of remarkable need for uranium-based target formation. The use of our U/BDD method is proposed as an environmental protocol to recover and immobilize uranium-235, and other fissile materials, from civil and defense wastes, contaminated systems, and stockpiles.

Dataset Information

Laser Shock Fabrication of Nitrogen Doped Inverse Spinel Fe₃O₄/Carbon Nanosheet Film Electrodes towards Hydrogen Evolution Reactions in Alkaline Media.

Publications

Laser Shock Fabrication of Nitrogen Doped Inverse Spinel Fe<sub>3</sub>O<sub>4</sub>/Carbon Nanosheet Film Electrodes towards Hydrogen Evolution Reactions in Alkaline Media.

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