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Stable Operation of Copper-Protected La(FeMnSi)H Regenerators in a Magnetic Cooling Unit.
ACS Appl Eng Mater
January 2025
Magnotherm Solutions GmbH, Pfungstädter Straße 102, 64297 Darmstadt, Germany.
Magnetic refrigeration leads the current commercialization efforts of ambient caloric cooling technologies, is considered among its peers most promising in terms of anticipated energy efficiency gain, and allows for complete elimination of harmful coolants. By now, functional magnetocaloric components (so-called regenerators) based on Mn-substituted and hydrogenated LaFeSi alloys are commercially available. However, this alloy system exhibits magnetostriction, is susceptible to fracture, oxidation, and does not passivate well, rendering it prone to failure and corrosion, particularly when using water as favorable heat exchange medium.
View Article and Find Full Text PDFChemical Redox Agent-Driven Noncorrosive Formation of Nanoporous Mg Structures for Advanced Hydrogen Storage.
ACS Nano
January 2025
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
Light metal-based nanomaterials are widely used for energy storage due to their high energy density and surface-to-volume ratio. However, their high reactivity is paradoxically both the source of advantageous properties and a hurdle to the fabrication of stable nanostructures. Here, we demonstrate the formation of nanoporous Mg via chemical redox agent-driven dealloying, which ensures minimized surface passivation and results in fine nanostructures with <50 nm of interconnected metallic ligament despite the labile chemical properties of Mg.
View Article and Find Full Text PDFHigh-Density CuBiO Photocathodes Using Well-Textured Buffer Layers and Their Unassisted Solar Hydrogen Production Performances.
Small
January 2025
School of Advanced Materials Science and Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Republic of Korea.
Solar hydrogen production using photoelectrochemical (PEC) cells requires the selection of cost-effective materials with high photoactivity and durability. CuBiO photocathodes possess an appropriate bandgap for efficient hydrogen production. However, their performance is limited by poor charge transport and interface voids formed due to the porous structure during annealing, which complicates the deposition of passivation overlayers.
View Article and Find Full Text PDFDesign of asymmetric electrolytes for aqueous zinc batteries.
Commun Chem
January 2025
Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, 999077, P. R. China.
Aqueous Zn batteries are gaining increasing research attention in the energy storage area due to their intrinsic safety, potentially low cost and environmental friendliness; however, the zinc dendrite formation, zinc corrosion, passivation and the hydrogen evolution reaction induced by water at the anode side, and materials dissolution as well as intrinsic poor reaction kinetics at cathode side in aqueous systems, seriously shorten the cycling life and decrease energy density of batteries and greatly hinder their development. Recent advancements in asymmetric electrolytes with various functions are promising to overcome such challenges for zinc batteries at the same time. It has been proved that the applications of asymmetric electrolytes show significant contributions in the field of zinc-based batteries in suppressing side reactions while maintaining electrochemical performance to satisfy both anode and cathode.
View Article and Find Full Text PDFInterface Engineering and Modulation of Nickel Oxide for High Air-Stable p-Type Crystalline Silicon Solar Cells.
Small
January 2025
Anhui Soltrend New Energy Technology Co., Ltd, Lujiang County, Hefei, 230000, China.
Dopant-free passivating contact crystalline silicon solar cells hold the potential of higher efficiency and cost down. In the hole-transport terminal, one still faces the challenge of trade-off between efficiency and stability. In this work, a H-AlO/NiO/Ni stacked hole-transport layer is proposed, where the H-AlO standing for H-rich AlO film can effectively reduce the interfacial defects and the high work function Ni metal results in a low contact resistance of 47.
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