Journal
ANALYTICAL SCIENCES
Volume 36, Issue 1, Pages 47-53Publisher
SPRINGERNATURE
DOI: 10.2116/analsci.19SAP02
Keywords
Dispersive XAFS; time-resolved; transition metal; heterogeneous catalyst; secondary battery
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Funding
- Research & Development Initiative for Scientific Innovation of New Generation Batteries 2 (RISING2) project from the New Energy and Industrial Technology Development Organization (NEDO) in Japan
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Dispersive X-ray absorption fine structure (DXAFS) spectroscopy is a versatile measurement technique for analyzing chemical reactions in real time. We have developed a novel time-resolved DXAFS instrument based on two polychromators and a wide-range position-sensitive detector that permits direct observation of the synergistic effects of two elements. This system enables simultaneous acquisition of the X-ray absorption spectra for two different elements without any mechanical movement of the X-ray optics. The developed system was successfully applied to monitor both the synthesis of a Ni-Cu bimetallic catalyst, which revealed that the reduction of Ni occurred at a higher temperature than that of Cu, and the charge-discharge processes of a LixNi0.5Mn1.5O4-based lithium-ion battery, which demonstrated that the redox reactions of Ni and Mn occurred sequentially at specific electrode potentials.
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