The relationship between charge and structure dictates the properties of electrochemical systems. For example, reversible Na-ion intercalation - a low-cost alternative to Li-ion technology - often induces detrimental structural phase transformations coupled with charge compensation reactions. However, little is known about the underpinning charge-structure mechanisms because the reduction-oxidation (redox) reactions within coexisting structural phases have so far eluded direct operando investigation. Here, we distinguish x-ray spectra of individual crystalline phases operando during a redox-induced phase transformation in P2-Na2/3Ni1/3Mn2/3O2 - an archetypal layered oxide for sodium-ion batteries. We measure the resonant elastic scattering on the Bragg reflection corresponding to the P2-phase lattice spacing. These resonant spectra become static midway through the sodium extraction in an operando coin cell, while the overall sodium extraction proceeds as evidenced by the X-ray absorption averaging over all electrochemically active Ni atoms. The stop of redox activity in the P2-structure signifies its inability to host Ni4+ ions. The coincident emergence of the O2- structure reveals the rigid link between the local redox and the long-range order during the phase transformation. The structure-selective x-ray spectroscopy thus opens a powerful avenue for resolving the dynamic chemistry of different structural phases in multi-phase electrochemical systems.
Operando Raman probing of mode selective electron phonon coupling in two dimensional halide perovskites
Institut national de la recherche scientifique（国家科学研究学院）；Eindhoven University of Technology（埃因霍温理工大学）；CNR NANOTEC, c/o Department of Chemistry, University of Bari（巴里大学化学系附属意大利国家研究委员会纳米技术研究所）；Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente（特温特大学科学与技术学院及MESA+纳米技术研究所）
Operando Charge Carrier Dynamics by Intensity-Modulated Photoluminescence: From Perovskite Thin Films to Solar Cells
Technische Universität Chemnitz（开姆尼茨工业大学）；Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden (IFW)（德累斯顿莱布尼茨固体与材料研究所）；Chair for Emerging Electronic Technologies, Technische Universität Dresden（德累斯顿工业大学新兴电子技术系）
Quantifying Phase Transformations in Alloying Anodes via In-Situ Liquid Cell Hard X-ray Spectroscopy and Cryogenic Microscopy
Imperial College London（帝国理工学院）；Diamond Light Source（钻石光源）；Max-Planck Institute for Sustainable Materials（马克斯·普朗克可持续材料研究所）；Univ Rouen Normandie, CNRS, INSA Rouen Normandie, Groupe de Physique des Matériaux, UMR 6634（鲁昂诺曼底大学、法国国家科学研究中心、鲁昂诺曼底国立应用科学学院、材料物理研究组）
Spatially inhomogeneous delithiation in LiNiO2 positive electrode: the effect of X-rays dose
Synchrotron SOLEIL（Soleil 同步辐射光源）；Technische Universität München（慕尼黑工业大学）；Centre National de la Recherche Scientifique, CNRS UR1（法国国家科学研究中心）；Réseau sur le Stockage Electrochimique de l’Energie (RS2E), CNRS FR3459（电化学储能研究网络）；Sorbonne Université, CNRS, Physicochimie des Electrolytes et Nanosystèmes Interfaciaux, CNRS UMR8234（索邦大学）
Insights on the volume variation of LiCoxMn2-xO4 electrode upon cycling: a correlative operando XRD and XAS study
Sorbonne Université, CNRS, Physicochimie des Electrolytes et Nanosystèmes interfaciaux (PHENIX)（索邦大学，法国国家科学研究中心，电解质与界面纳米系统物理化学）；Sorbonne Université, CNRS, Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP)（索邦大学，法国国家科学研究中心，巴黎凝聚态物质化学实验室）；Réseau sur le Stockage Electrochimique de l’Energie (RS2E), FR CNRS 3459（电化学储能研究网络（RS2E），FR CNRS 3459）
Ultrafast order-selective electron imaging and spectroscopy
Georg-August-Universität Göttingen（哥廷根大学）；Max Planck Institute for Multidisciplinary Sciences（马克斯·普朗克多学科科学研究所）；University of Göttingen（哥廷根大学）；Philipps-Universität Marburg（马尔堡菲利普大学）
Unraveling the storage mechanism of Na$_{3}$V$_{2-x}$Ni$_x$(PO$_4$)$_2$F$_3$/C cathodes for sodium-ion batteries through electrochemical, {\it operando} X-ray diffraction and microscopy studies
本研究结合 EIS、GITT、CV、operando XRD 与原位同步辐射 TXM，揭示 Ni 掺杂 Na₃V₂(PO₄)₂F₃/C 正极的储钠机制、扩散动力学及长循环稳定性。
Ultrafast electron dynamics in Au/Fe/MgO(001) analyzed by Au- and Fe-selective pumping in time-resolved two-photon photoemission spectroscopy: Separation of excitations in adjacent metallic layers
Predictive autoencoder-transformer model of Cu oxidation state from EELS and XAS spectra
Brookhaven National Lab（布鲁克海文国家实验室）；Binghamton University（宾汉顿大学）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）；University of California, Berkeley（加州大学伯克利分校）
