Latest Breaking News On - X ray absorption spectroscopy - Page 5 : comparemela.com

"In Situ Synchrotron X-Ray Absorption Spectroscopy Studies of Anode Mat" by Zhibin Wu, Wei Kong Pang et al.

Taking advantage of a high-flux light source, synchrotron X-ray absorption spectroscopy (XAS) beamline is able to perform in situ/ex situ, element-selective, and qualitative/quantitative experiments to elucidate electrochemical reaction mechanisms of batteries accurately and efficiently. In situ synchrotron XAS probes dynamic electronic and local atomic structure information, including valence state, charge transfer, local geometry and symmetry, bond number/length/type and disorder degree, of target elements of significance during battery operation, which facilitates to promote the development of rechargeable batteries by building accurate structure-performance relationships fundamentally. In this review, the basic principles for XAS are briefly introduced, design strategies for in situ XAS experiments are proposed, salient in situ XAS studies of battery anodes are summarized, and current challenges and future opportunities based on XAS measurements are also outlined.

"Synchrotron X-Ray Absorption Spectroscopy and Electrochemical Study of" by Zhibin Wu, Gemeng Liang et al.

Abstract Elucidating the battery operating mechanism is important for designing better conversion-type anodes as it determines the strategies used to improve electrochemical performances. Herein, the authors pioneered the electrochemical study of layered Bi O Se as anodes for lithium-ion batteries (LIBs) and potassium-ion batteries (PIBs). Surprisingly, the Bi O Se/graphite composite electrode shows even better cycle stability for PIBs. The electrochemical reaction mechanisms of the Bi O Se/graphite electrode for LIBs and PIBs are investigated by potential-resolved in situ and ex situ X-ray absorption spectroscopy based at the Bi L -edge and Se K-edge through characterizing the local atomic structure evolution, valence state change, and charge transfer. New insights are gained regarding the electrochemical process of Se anions in Bi O Se, where multiple Li–Se intermediates rather than the traditional single-phase Li Se are involved in this conversion-type anode. The advanced unde

From Antarctica to California: how water birds detoxify mercury