In situ activation of Br-confined Ni-based metal-organic ... - AAAS
Nov 10, 2021 · By using operando x-ray absorption fine structure (XAFS) spectroscopy, successive structural transformations of Br-Ni-MOF hollow prism electrocatalysts into the β-Ni (OH) 2 and γ-NiOOH analogs during the OER process are promptly observed.
Reversing sintering effect of Ni particles on γ-Mo2N via ... - Nature
Nov 30, 2021 · A Ni-4nm/γ-Mo 2 N model catalyst is synthesized and used to further study the reverse sintering effect by the combination of multiple in-situ characterization methods, including in-situ...
Sulfidation of Supported Ni, Mo and NiMo Catalysts Studied by In Situ XAFS
Jan 18, 2023 · Herein we present a comparative XAFS study where the in situ sulfidation of Mo/δ-Al 2 O 3 and Ni/δ-Al 2 O 3 is compared to that of δ-Al 2 O 3 supported NiMo catalysts with different NiMo ratios.
Coordination environment tuning of nickel sites by oxyanions to ...
May 25, 2022 · X-ray absorption fine structure (XAFS) spectra at the Ni K-edge were obtained at the Advanced Photon Source (APS), beamline 9-BM. The samples were pressed into pellets and measured in the...
Ultrathin Nickel Hydroxide and Oxide Nanosheets: Synthesis ...
Aug 29, 2014 · To investigate local atomic arrangements and electronic structures of ultrathin α-Ni(OH) 2 nanosheets, X-ray absorption fine structure spectroscopy (XAFS) measurements at Ni K-edge are...
Deciphering the Local Environment of ... - Wiley Online Library
XAFS enables the determination of active sites in complex systems, offers insights into the dynamic behavior of metal sites during catalytic reactions, and elucidates the structure–catalysis relationship. The review also outlines the main challenges and opportunities for XAFS in exploring electrocatalytic sites.
XAFS investigation of the structure and valency of nickel in some ...
Mar 1, 1995 · We report on the valency and local structure of nickel in α-Ni(OH) 2, β-Ni(OH) 2, Ni 2 O 3 ·6H 2 O, Ni 3 O 2 (OH) 4, β-NiOOH, γ-NiOOH, NiO 2 and NiKIO 6.
Ni K‐edge XAFS analysis of NiO thin film with multiple scattering ...
Mar 12, 2021 · We investigate the Ni K-edge X-ray absorption fine structure spectra of the nickel oxide thin films in order to obtain the structural information around Ni. For the X-ray absorption near edge structure (XANES) analyses, we apply a full multiple scattering theory.
Fluorescence x-ray absorption fine structure studies of Fe-Ni-S …
Apr 23, 2008 · We report Ni K-edge fluorescence x-ray absorption fine structure spectra (XAFS) for Fe 0.75 Ni 0.05 S 0.20 and Fe 0.75 Ni 0.05 Si 0.20 ternary alloys from room temperature up to 1600 K. A high-temperature furnace designed for these studies incorporates two x-ray transparent windows and enables both a vertical orientation of the molten sample ...
Interpretation of the Ni K-edge EXAFS in ... - ScienceDirect
Jul 1, 2011 · In particular, the Ni K-edge absorption is caused by the transition of a 1 s electron of nickel from its core atomic state to a final unoccupied state following to dipole (Δl = ± 1) or quadrupole (Δl = 0, ± 2) selection rules.