Widitha S. Samarakoon

Data for EMSL Project 50242 from September 2021

Scott Lea, Peter V. Sushko, Yingge Du, Donald R. Baer et autres

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Data for EMSL Project 50242 from September 2021

Scott Lea, Peter V. Sushko, Yingge Du, Donald R. Baer et autres

us, cn (code pays fourni par la source)

Decoupling Li out-diffusion and surface diffusion in the lithiation-assisted epitaxial growth of lithium tungstate

Jueli Shi, Widitha S. Samarakoon, Min‐Ju Choi, Le Wang et autres

Lithiation-assisted epitaxy offers a flexible and robust approach for synthesizing high-quality Li-containing materials and interfaces with precise control. In this study, we use lithium tungstate (${\mathrm{Li}}_{x}\mathrm{W}{\mathrm{O}}_{3+x/2}$, where $x=0$ to 2) as a model system to investigate the intertwined effects of Li out-diffusion-induced …

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Quantification of Oxygen Vacancies in SrFe 0.5 Cr 0.5 O 3−δ Thin Films: Correlating Lattice Expansion with Oxidation State Variability

Mohammad Delower Hossain, Krishna Prasad Koirala, Le Wang, Widitha S. Samarakoon et autres

Oxygen vacancies (V O ), even in the dilute regime, can significantly impact the physical and chemical properties of complex oxides. It is however challenging to reliably detect and adequately quantify such defects in thin film samples where the V O concentration …

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The role of nonmetallic ion substitution in perovskite LaCoO3 for improved oxygen evolution reaction activity

Maoyu Wang, Kingsley Chukwuma Chukwu, Brian A. Muhich, Widitha S. Samarakoon et autres

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The Role of Nonmetallic Ion Substitution in Perovskite Lacoo3 for Improved Oxygen Evolution Reaction Activity

My Wang, Kingsley Chukwuma Chukwu, Brian A. Muhich, Widitha S. Samarakoon et autres

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Transient electron scavengers modulate carrier density at a polar/nonpolar perovskite oxide heterojunction

Widitha S. Samarakoon, Peter V. Sushko, Dooyong Lee, Bharat Jalan et autres

Modern thin-film synthesis enables the fabrication of heterostructures in which individual phases can consist of as little as one unit cell. In this extreme thin-film limit, point defects can have a measurable effect on the electronic properties. Such is the case for …

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Direct Imaging of the Structural and Morphological Evolution of Epitaxial LiCoO2 Films during Charge and Overcharge

Widitha S. Samarakoon, Jiangtao Hu, Miao Song, Mark Bowden et autres

The capacity decay of layered cathodes in high-voltage applications underscores the need to utilize accurate and precise techniques to understand the underlying mechanisms. Here, we use well-defined epitaxial LiCoO 2 (LCO) films on SrRuO 3 /SrTiO 3 (SRO/STO) with controlled orientations and …

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Probing electronic dead layers in homoepitaxial n-SrTiO3(001) films

Scott A. Chambers, Dooyong Lee, Zhifei Yang, Yi Huang et autres

We combine state-of-the-art oxide epitaxial growth by hybrid molecular beam epitaxy with transport, x-ray photoemission, and surface diffraction, along with classical and first-principles quantum mechanical modeling to investigate the nuances of insulating layer formation in otherwise high-mobility homoepitaxial n-SrTiO3(001) films. Our analysis …

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Spontaneous Lithiation of Binary Oxides during Epitaxial Growth on LiCoO2

Le Wang, Zhenzhong Yang, Widitha S. Samarakoon, Yadong Zhou et autres

Epitaxial growth is a powerful tool for synthesizing heterostructures and integrating multiple functionalities. However, interfacial mixing can readily occur and significantly modify the properties of layered structures, particularly for those containing energy storage materials with smaller cations. Here, we show a two-step …

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The Restructuring-Induced CoOx Catalyst for Electrochemical Water Splitting

Maoyu Wang, Qingbo Wa, Xiaowan Bai, Zuyun He et autres

High Resolution Image Download MS PowerPoint Slide Restructuring is an important yet less understood phenomenon in the catalysis community. Recent studies have shown that a group of transition metal sulfide catalysts can completely or partially restructure during electrochemical reactions which then exhibit …

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Revealing the Fast and Durable Na+ Insertion Reactions in a Layered Na3Fe3(PO4)4 Anode for Aqueous Na-Ion Batteries

Qiu Shen, Marcos Lucero, Xianyong Wu, Qi Wang et autres

High Resolution Image Download MS PowerPoint Slide Aqueous sodium-ion batteries represent a promising approach for stationary energy storage; however, the lack of appropriate anode materials has substantially retarded their development. Herein, we demonstrated an iron-based phosphate material of Na 3 Fe 3 …

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