News / In Focus

Materials Chemistry Frontiers, Jin-Ming Chen, Kuehi-Tzu Lu, extended X-ray absorption fine structure (EXAFS), electrode material, bimetallic sulfide
Research Results of NSRRC Scientists, Jin-Ming Chen and Kuehi-Tzu Lu Highlighted as a Cover of Materials Chemistry Frontiers
In recent decades, energy storage technologies have become one of the mainstreams in research and development. As the growth of electric vehicles and some electronic devices, the electrode materials for energy storage devices play a very crucial role. The performance of electrode materials depends on their structures and electrochemical activities; bimetal system materials are notably better than single metal system materials, in terms of their electrochemical activities. The scientists from NSRRC, Dr. Jin-Ming Chen and Dr. Kueih-Tzu Lu, have expertise in developing energy-related materials and solid state electrolytes, as well as the study of crystal structure, electron spin state and electronic structure of novel material under high pressure using X-ray absorption spectroscopy and X-ray emission spectroscopy. In recent years, Dr. Jin-Ming Chen and Dr. Kueih-Tzu Lu lead their team to study new energy materials and the X-ray spectroscopies under electrochemical reaction. In 2021, their research results were published in the Materials Chemistry Frontiers, and highlighted as a front cover of the journal.
This article investigated high-performance bimetallic sulfides as electrode materials. The experimental results were mainly achieved by using TPS 44A and TLS 01C2 beamlines to conduct X-ray spectroscopy analysis which obtained in-depth information on material structure, valence state and the transformation of elemental composition during electrochemical charge and discharge processes. Dr. Chen’s team found that sulfide-based electrode was superior to the oxide electrode in electrochemical performance and the corresponding energy storage performance since sulfide electrodes were more electrochemically active than the corresponding oxide electrodes. It was further found from the extended X-ray absorption fine structure (EXAFS) spectra that the sulfide-based electrode material was converted to an oxide electrode during the electrochemical reaction processes.