In situ X-ray spectroscopies beyond conventional X-ray ... - Nature
2023年10月18日 · With the advances of high photon flux at new-generation synchrotron radiation facilities, advanced X-ray spectroscopies with high-energy resolution, such as high-energy-resolution...
Design of Single-Atom Catalysts and Tracking Their Fate Using
In this review, starting from their fundamentals, various techniques related to conventional XAS and X-ray photon in/out techniques applied to single sites are discussed with detailed mechanistic and in situ / operando studies.
Adsorbate Configurations in Ni Single-Atom Catalysts during
2024年11月25日 · Adsorbate Configurations in Ni Single-Atom Catalysts during CO 2 Electrocatalytic Reduction Unveiled by Operando XAS, XES, and Machine Learning. Andrea Martini 1, ... and x-ray absorption (XAS) at the Ni L 3-edge were employed to unveil the structure and electronic properties of the reaction intermediates. These techniques, coupled with ...
Approaches to achieve surface sensitivity in the in situ XAS of ...
2021年6月1日 · This review will present recent in situ XAS studies on single-atom, metal, and metal oxide electrocatalysts, highlighting the approaches taken to achieve surface sensitivity by careful designing of the sample under investigation.
X-ray absorption spectroscopy | Nature Reviews Methods Primers
3 天之前 · An XAS spectrum is obtained by measuring the modulation of the sample absorption coefficient as a function of the incident X-ray beam energy. ... the photoelectron scatters from one atom (single ...
In Situ X-ray Absorption Spectroscopy Studies of Nanoscale ...
2019年6月3日 · The fluorescence mode of XAS is well suited to study samples in diluted or low concentration. The resolution of EXAFS is sub-angstrom, making XAS a unique probe to study single-atom catalysts. Wang et al. reported a nitrogen-coordinated single cobalt atom catalyst with respectable ORR activity and stability in acidic media .
Probe active sites of heterogeneous electrocatalysts by X-ray ...
2019年4月1日 · Synchrotron-based X-ray absorption spectroscopy (XAS) is a powerful tool for detecting local electronic and atomic structures of single-metal sites 14, 15, and the high-brilliance synchrotron X-ray enable investigation on catalysts with ultralow metal-loading.
Detailed quantitative XAS investigation revealed single-atom Pt ...
2024年10月15日 · Herein we provide additional quantitative findings from extended X-ray absorption fine structure spectroscopy (EXAFS) to support the superior ethylene yield (YC2H4) of 87.6 % over (PtCuOx/Z) compared to 62.9 % over PtCoOx/Z at 200°C when acetylene conversion (XC2H2) was highest over both catalysts.
Understanding the Dynamic Aggregation in Single-Atom Catalysis
2024年1月29日 · The past decade has witnessed the explosion of research on atomically dispersed metal catalysts or “single-atom catalysts (SACs).” [1, 2] The interest is driven by the desire to mimic the homogeneous pathway for extremely high activity and chemoselectivity on durable, process-friendly heterogeneous supports.
Single metal atom and coordinated atoms constitute the active site, determining the catalytic activity. Electronic structures of SACs and adsorption of intermediates are depended on the