2023年6月24日 · 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.

2022年8月18日 · 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 ...

2023年11月6日 · Importantly, through in situ XAFS and theoretical calculations, we reveal the structural evolution of Ni single-atom active sites (Ni-N 3 → O 1-Ni-N 2 → HOO-Ni-N 2) in surface reactions ...

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,...

Welcome to the IXAS XAFS database! 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.

2022年10月1日 · 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.

2023年9月6日 · 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.

2023年4月1日 · Furthermore, advanced characterization technologies, such as scanning transmission electron microscopy (STEM) and X-ray absorption fine structure (XAFS) measurement, facilitate the identification of ADMSs in COFs. The STEM enables direct visualization of the ADMSs and the surrounding atoms in COFs through the difference in contrast.

酞菁镍 (NiPc)因其具有可以调节的镍活性中心，而被认为是实现上述目标的一个极具前景的候选品。然而，原始NiPc由于在Ni位点处的CO2吸附和活化性能较差，因此通常表现出较低的CO2RR的活性和稳定性。

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. The XAFS analyses combined with the multiple scattering theory give useful information on nano-structures of small amount species ...