High-entropy PtCuSnWNb nanoalloys as efficient and stable catalysts for ethanol oxidation electrocatalysis
Chem Commun (Camb). 2024 Mar 20. doi: 10.1039/d4cc00170b. Online ahead of print.ABSTRACTTernary nanoalloys used as electrochemical ethanol oxidation catalysts for direct ethanol fuel cells are confronted with poor stability issues under harsh acidic operating conditions. To address this issue, a carbon-supported quinary PtCuSnWNb high-entropy nanoalloy (denoted as PtCuSnWNb/C) was synthesized by using a polyol reduction method. Due to the unique high-entropy mixing states and strong catalyst-support interactions, PtCuSnWNb/C shows robust structural and compositional stability.PMID:38505979 | DOI:10.1039/d4cc00170b (Source:...
Source: Chemical Communications - March 20, 2024 Category: Chemistry Authors: Yongying Wang Zhengwei Zhang Tieyu Hu Juan Yang Yi Li Source Type: research
The size-dependent valence and conduction band-edge energies of Cu quantum dots
Chem Commun (Camb). 2024 Mar 20. doi: 10.1039/d4cc00260a. Online ahead of print.ABSTRACTUltra-small metal particles having band gaps are regarded as a new class of functional materials. We investigated the size dependencies of the band-edge energies on Cu quantum-dots in the size range of 0.7-2.1 nm. The extremely high conduction band-edge energies owing to the strong quantum-size effects were observed for sizes below 1 nm.PMID:38505980 | DOI:10.1039/d4cc00260a (Source: Chemical Communications)
Source: Chemical Communications - March 20, 2024 Category: Chemistry Authors: Takahiro Matsui Hiroto Watanabe Shoichi Somekawa Sayaka Yanagida Yuya Oaki Hiroaki Imai Source Type: research
Site-selective direct nitration of 2 < em > H < /em > -indazoles: easy access to 7-nitroindazoles
Chem Commun (Camb). 2024 Mar 20. doi: 10.1039/d4cc00214h. Online ahead of print.ABSTRACTA new site-selective methodology for C-H nitration of 2H-indazoles has been accomplished at the C7 position using iron(III) nitrate. This strategy enables practical access to an array of 7-nitroindazoles with broad functional group tolerance in good yields. The synthesized products have been proven as valuable synthetic intermediates by demonstrating the synthetic utility. Mechanistic investigations indicate that the reaction goes through a radical pathway.PMID:38506140 | DOI:10.1039/d4cc00214h (Source: Chemical Communications)
Source: Chemical Communications - March 20, 2024 Category: Chemistry Authors: Suvam Bhattacharjee Alakananda Hajra Source Type: research
One-pot C-N/C-C bond formation and oxidation of donor-acceptor cyclopropanes with tetrahydroisoquinolines: access to benzo-fused indolizines
Chem Commun (Camb). 2024 Mar 20. doi: 10.1039/d4cc00810c. Online ahead of print.ABSTRACTOne-pot C-N/C-C bond formation of donor-acceptor cyclopropanes (DACs) with tetrahydroisoquinolines (THIQs) has been achieved to furnish benzo-fused indolizines. These reactions involve a MgI2-catalyzed ring opening of DACs and oxidative annulation using Mn(OAc)3ยท2H2O. The substrate scope and functional group diversity are the important practical features.PMID:38506143 | DOI:10.1039/d4cc00810c (Source: Chemical Communications)
Source: Chemical Communications - March 20, 2024 Category: Chemistry Authors: Pallab Karjee Bijoy Debnath Santu Mandal Sharajit Saha Tharmalingam Punniyamurthy Source Type: research
< em > In situ < /em > electrochemical Mn vacancies in CoMnHCF for a high level of zinc storage
Chem Commun (Camb). 2024 Mar 20. doi: 10.1039/d4cc00454j. Online ahead of print.ABSTRACTCoMnHCF is utilized in aqueous sodium/zinc mixed ion batteries and exhibits a high reversible capacity with good rate and cycle performances. At 0.05 A g-1 current density, the CoMnHCF can deliver a specific capacity for 180.4 mA h g-1, and have 99.3% capacity retention after 300 cycles at 0.3 A g-1. Such high reversible capacity profits from Mn vacancies that generate in situ during the first cycle, which provides more active sites for Zn storage. The de-intercalation of Na+ further elevates this good electrochemical performance. Co at...
Source: Chemical Communications - March 20, 2024 Category: Chemistry Authors: Dan Wang Ziyue Zhou Tengfei Ma Jinhua Zhang Yunhe Zhang Rui Ma Dapeng Zhang Tingjiang Yan Source Type: research
