Results 31 to 40 of about 39,813 (246)

Tuning the Electronic Structure and Spin State of Fe─N─C Catalysts Using an Axial Oxygen Ligand and Fe Clusters for High‐Efficiency Rechargeable Zinc–Air Batteries

Advanced Functional Materials, EarlyView.
A FeN4─O/Clu@NC‐0.1Ac catalyst containing atomically‐dispersed FeN4─O sites (medium‐spin Fe2+) and Fe clusters delivered a half‐wave potential of 0.89 V for ORR and an overpotential of 330 mV at 10 mA cm−2 for OER in 0.1 m KOH. When the catalyst was used in a rechargeable Zn–air battery, a power density of 284.5 mW cm−2 was achieved with excellent ...
Yongfang Zhou, Yu Mao, Mengyao Chang, Ziyun Wang, Wenke Xie, Cuizhu Ye, Shanghai Wei, Lars Thomsen, Geoffrey I. N. Waterhouse   +8 more
wiley   +1 more source

Phonon effects on x-ray absorption and nuclear magnetic resonance spectroscopies

, 2015
In material sciences, spectroscopic approaches combining ab initio calculations with experiments are commonly used to accurately analyze the experimental spectral data.
Bordage, Amélie, Brouder, Christian, Cabaret, Delphine, Errea, Ion, Gervais, Christel, Mauri, Francesco, Nemausat, Ruidy, Trcera, Nicolas   +7 more
core   +3 more sources

XANES Study of Structural Disorder in Amorphous Silicon [PDF]

, 1990
An investigation of the structure of several amorphous silicon (a-Si) films is presented. Samples were prepared by using the ion beam sputtering technique at different substrate deposition temperatures.
Bianconi, A.,, Cicco, A. Di,, Coluzza, C.,, Flank, A.M.,, Lagarde, P.,, Marcelli, A.,, Rudolf, P.,   +6 more
core   +3 more sources

Auto‐Generated Valence States in Electrocatalysts for Boosting Oxygen and Hydrogen Evolution Kinetics in Alkaline Water/Alkaline Seawater/Simulated Seawater/Natural Seawater

Advanced Functional Materials, EarlyView.
This review systematically highlights the latest achievements in mixed‐valence states relevant to hydrogen and oxygen evolution reactions, providing essential insights into future directions and methods for large‐scale practical implementation. This critical review is expected to provide an overview of recent advancements in diverse valence‐state metal
Jitendra N. Tiwari, Gokul Bhaskaran, Krishan Kumar, Yun Suk Huh, Young‐Kyu Han   +4 more
wiley   +1 more source

TXM-Pal: a companion software for advanced data processing in spectroscopic X-ray microscopy

Journal of Synchrotron Radiation
Transmission X-ray microscopy (TXM) is a powerful and non-destructive tool for interpreting the chemical states of a wide range of materials. It utilizes X-ray absorption near-edge structure (XANES) for the chemically sensitive mapping of specific ...
Sugeun Jo, Sangwoo Kim, Jun Lim
doaj   +1 more source

Trained to corrode: Cultivation in the presence of Fe(III) increases the electrochemical activity of iron reducing bacteria – An in situ electrochemical XANES study

Electrochemistry Communications, 2020
This paper reports results from in situ electrochemical X-ray absorption near-edge spectroscopy (XANES) studies of the corrosion processes on model thin iron films in the presence of iron reducing bacteria Shewanella putrefaciens. Here we investigate the
Nina Wurzler, Jan David Schutter, Ralph Wagner, Matthias Dimper, Dirk Lützenkirchen-Hecht, Ozlem Ozcan   +5 more
doaj   +1 more source

Simultaneous valence shift of Pr and Tb ions at the spin-state transition in ((Pr$_{1-y}$Tb$_{y})_{0.7}$Ca$_{0.3}$CoO$_{3}$

, 2013
Temperature dependence of the X-ray absorption near-edge structure (XANES) spectra at the Pr $L_{3}$- and Tb $L_{3}$-edges was measured for the (Pr$_{1-y}$Tb$_{y})_{0.7}$Ca$_{0.3}$CoO$_{3}$ system, in which a metal-insulator (MI) and spin-state (SS ...
Fujishiro, H., Hejtmanek, J., Jirak, Z., Knizek, K., Naito, T., Nitta, K., Takeda, D., Watanabe, T., Yoshida, N.   +8 more
core   +1 more source

XAS study of the local environment of impurities in doped TiO2 thin films [PDF]

, 2007
In this work we present an X-ray Absorption Spectroscopy characterization of the local environment of the impurity in room temperature ferromagnetic anatase TiO2 thin films doped with Co, Ni, Cu, or Zn, deposited on LaAlO3 substrate by Pulsed Laser ...
A.F. Cabrera, C.E. Rodríguez Torres, Chambers, Duhalde, Duhalde, Errico, F. Golmar, F.H. Sánchez, L.A. Errico, M. Rentería, Matsumoto, Park, S. Duhalde, Weng   +13 more
core   +2 more sources

Germanane Quantum Dots Promote Metabolic Reprogramming of Immune Cells Toward Regulatory T Cells and Suppress Inflammation In Vitro and In Vivo

Advanced Functional Materials, EarlyView.
Metabolic changes in immune cells direct the phenotype and function of the host immune system. Smart nanomaterials must target metabolic pathways to direct immune cell fate. This study reports the fabrication and first application of germanane quantum dots (GeHQDs) to modulate inflammation in vitro and in vivo.
Abhay Srivastava, Alireza Rafieerad, Weiang Yan, Keshav Narayan Alagarsamy, Qingdong Guan, Leena Regi Saleth, Michel Aliani, Sanjiv Dhingra   +7 more
wiley   +1 more source

Local Structure and Magnetism of LiFeSi0.01P0.99O4/C as a Cathode Material on Lithium-Ion Battery

Journal of Magnetism and Its Applications, 2021
The oxidation state and local structure of LiFeSi0.01P0.99O4/C composites as a cathode on lithium-ion battery were investigated by Fe K-edge X-ray Absorption Near Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS). The LiFeSi0.
Vera Laviara Maghfirohtuzzoimah, Sahara Hamas Intifadhah, Pelangi Az-zahra, Wantana Klysubun, Dita Puspita Sari, Isao Watanabe, Mochamad Zainuri, Fahmi Astuti   +7 more
doaj   +1 more source