Magnetic properties in α-MnO 2 doped with alkaline elements
2015年3月13日 · In this work, we studied the ferromagnetic behaviour in K-doped MnO 2 nanotubes. X-ray absorption near edge spectroscopy (XANES) indicates that Mn is very close to 4+ valency rather than 3+,...
XAFS of alkaline element doped MnO2. (a) XAFS spectra of K-MnO2 …
In this manuscript we report microwave-assisted synthesis of MnO2 embedded carbon nanotubes (MnO2@CNT) from Mn-H3BTC (benzene-1,3,5-carboxylic acid) metal organic frameworks (MOF) precursors.
Enhancing polyol/sugar cascade oxidation to formic acid with …
2023年7月26日 · In this study, we develop a defective MnO 2 catalyst through a coordination number reduction strategy to enhance the aerobic oxidation of various polyols/sugars to formic acid.
Relationship between Mn Oxidation State Changes and ... - ACS Publications
2021年5月16日 · In situ X-ray absorption and emission spectroscopies (XAS and XES) are used to provide details regarding the role of the accessibility and extent of redox activity of the Mn ions in determining the oxygen reduction activity of LaMnO 3 and CaMnO 3, with X-ray absorption near-edge structure (XANES) providing the average oxidation state, extended X...
Tensile straining of iridium sites in manganese oxides for proton ...
2024年1月2日 · Herein, we present a low-iridium electrocatalyst in which tensile-strained iridium atoms are localized at manganese-oxide surface cation sites (TS-Ir/MnO 2) for high and sustainable OER activity....
Atomically dispersed hexavalent iridium oxide from MnO2
In this work, we report the successful synthesis of an atomically dispersed hexavalent iridium oxide (Ir VI - ado) and show that this material has higher mass-specific activity and stability during PEM electrolysis compared with other Ir oxides reported so far.
a XANES spectra of Mn metal, MnO2, Mn/C, and MnNx/C. b
In this work, a set of MnO nanostructures supported on activated charcoal (MnO/C) with varying MnO loadings are prepared by ball milling followed by in-situ pyrolysis. The MnO/C composites are...
Soft X-ray absorption spectroscopic investigation of MnO2…
2022年4月1日 · Electrochemistry and X-ray absorption spectroscopy (XAS) of MnO 2 /reduced graphene oxide (RGO) were made to evaluate capacitive performance and electronic structure as a supercapacitor. MnO 2 was deposited on the surface of RGO by a spontaneous redox reaction.
Fourier-transformed XAFS spectra of different samples
This work demonstrates a more effective Pt-dispersed MnO2 catalyst than Pt-embedded MnO2 catalyst for HCHO oxidation, providing universally important guidance for metal-support interaction and...
二氧化锰多晶型物的EXAFS研究,Journal of Materials Science - X-MOL
EXAFS 提出了对二氧化锰中锰离子价态进行无损分析的可能性。 已尝试使用扩展 X 射线吸收精细结构 (EXAFS) 来研究二氧化锰的多晶型物（β、γ 和 α 型以及斜方锰矿）。 发现γ-MnO2 共生结构的（1×1）隧道与（1×2）隧道的比例高达46.2%。 阐明了锰离子的价态与阈值吸收能 (E0)之间的关系，发现E0的顺序为：β>γ>α (K)>α (Ba)。 EXAFS 提出了对二氧化锰中锰离子价态进行无损分 …