Jun 24, 2023 · Operando SR-IRAS and XAFS characterization. Systematic spectroscopic and electrochemical analyses have demonstrated the fine structure and better CO 2 RR performance of Ni-N-C.

Aug 18, 2022 · According to theoretical calculations and in situ XAFS techniques, Ni dual-atom sites allow a significantly boosted electrochemical CO 2 reduction through sufficient CO 2 activation and ...

Nov 6, 2023 · Throughout the in situ XAFS, the FT-EXAFS spectra (Fig. 5b) show that the main peak shifts (~0.03 Å) to longer lengths, implying the expansion of the Ni-N bonds during the reaction.

In addition, in the extended X-ray absorption fine structure (EXAFS) spectra (Figure 1 b), the main peaks of NiPc and HS-NiPc at approximately 1.46 Å (Ni−N bond) exhibit similar intensity,...

Sep 6, 2023 · In the multiple H 2 Pc/NiPc-COFs, the electron-donating features of the H 2 Pc units provide electron transport to the NiPc centers and thus improved the binding ability of CO 2 and intermediates on the NiPc units.

This EXAFS database, which consists of just about every scan of data ever taken by Farrel Lytle, is a service of the International X-ray Absorption Society. The site is hosted by the Center for Synchrotron Radiation Research and Instrumentation at Illinois Institute of Technology.

Oct 1, 2022 · Here we employ operando high-energy resolution fluorescence-detected X-ray absorption spectroscopy (HERFD-XAS) to track the structural evolution of Ni (II) phthalocyanine (NiPc), considered as the model catalysts with uniform Ni-N 4 -C 8 moiety, during the CO 2 RR.

Residual Ni species after Ni removal treatment of carbon nanofibers have been investigated by use of XAFS analyses. Most of the Ni impurities are in Ni monomer which is located on defects in carbon nanofibers.

XAFS region (Ni Kedge XANES) with calculated partial densities of free states (Section 3.3). 2. EXPERIMENT The nickel phthalocyanine samples used in present work were synthesized by the Linstead method [1] using phthalonitrile and the corresponding salt of Ni. The reaction product was purified chemically by

Jul 1, 2011 · Analysis of atomic structure at the nanoscale is a challenging task, complicated by relaxation phenomena and thermal disorder. In this work, the x-ray absorption spectroscopy at the Ni K-edge was used to address this problem in nanocrystalline NiO (nano-NiO) at 300 K.