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Ball-milled MoS with graphene shows enhanced catalytic activity for hydrogen evolution reaction.
Sci Technol Adv Mater
May 2024
Department of Materials Science, Institute of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan.
The hydrogen evolution reaction (HER) is an important phenomenon in water splitting. Consequently, the development of an active, earth-abundant, and inexpensive HER catalyst is highly desired. MoS has drawn considerable interest as an HER catalyst because it is composed of non-precious metal and exhibits high catalytic activity in the nanosheet form.
View Article and Find Full Text PDFSize-Controlled CuVSe Nanocrystals as Cathode Material in Platinum-Free Dye-Sensitized Solar Cells.
ACS Appl Mater Interfaces
March 2024
Department of Mechanical and Materials Engineering, Florida International University, Miami, Florida 33174, United States.
In this work, we report the first single-step, size-controlled synthesis of CuVSe cuboidal nanocrystals, with the longest dimension ranging from 9 to 36 nm, and their use in replacing the platinum counter electrode in dye-sensitized solar cells. CuVSe, a ternary semiconductor from the class of sulvanites, is theoretically predicted to have good hole mobility, making it a promising candidate for charge transport in solar photovoltaic devices. The identity and crystalline purity of the CuVSe nanocrystals were validated by X-ray powder diffraction (XRD) and Raman spectroscopy.
View Article and Find Full Text PDFElucidation of the electronic structures of thiolate-protected gold nanoclusters by electrochemical measurements.
Dalton Trans
October 2023
Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan.
Metal nanoclusters (NCs) with sizes of approximately 2 nm or less have different physical/chemical properties from those of the bulk metals owing to quantum size effects. Metal NCs, which can be size-controlled and heterometal doped at atomic accuracy, are expected to be the next generation of important materials, and new metal NCs are reported regularly. However, compared with conventional materials such as metal complexes and relatively large metal nanoparticles (>2 nm), these metal NCs are still underdeveloped in terms of evaluation and establishment of application methods.
View Article and Find Full Text PDFDesign of Size-Controlled Sulfur Nanoparticle Cathodes for Lithium-Sulfur Aviation Batteries.
Small
September 2023
College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China.
Lithium-sulfur (Li-S) battery has been considered as a strong contender for commercial aerospace battery, but the commercialization requires Ah-level pouch cells with both efficient discharge at high rates and ultra-high energy density. In this paper, the application of lithium-sulfur batteries for powering drones by using the cathode of highly dispersed sulfur nanoparticles with well-controlled particle sizes have been realized. The sulfur nanoparticles are prepared by a precipitation method in an eco-friendly and efficient way, and loaded on graphene oxide-cetyltrimethylammonium bromide by molecular grafting to realize a large-scale fabrication of sulfur-based cathodes with superior electrochemical performance.
View Article and Find Full Text PDFSize controllable single-crystalline Ni-rich cathodes for high-energy lithium-ion batteries.
Natl Sci Rev
February 2023
CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing100190, China.
A single-crystalline Ni-rich (SCNR) cathode with a large particle size can achieve higher energy density, and is safer, than polycrystalline counterparts. However, synthesizing large SCNR cathodes (>5 μm) without compromising electrochemical performance is very challenging due to the incompatibility between Ni-rich cathodes and high temperature calcination. Herein, we introduce Vegard's Slope as a guide for rationally selecting sintering aids, and we successfully synthesize size-controlled SCNR cathodes, the largest of which can be up to 10 μm.
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