@article{9784d85805934c4ca9f902d5e210b9bc,
title = "Electrochemical generation of birnessite MnO2 nanoflowers for intercalation of Mg2+ ions",
abstract = "Rechargeable multivalent ion battery such as Mg-ion battery is considered as a candidate for high-density battery technology because of its high volumetric capacity and low tendency to form dendrites. Development of cathode materials for Mg-ion batteries requires good understanding of the intercalation and adsorption processes of Mg2+ ions into and on the host materials. We observed recently that nanostructure is beneficial for the development of Mg2+ cathode materials with high capacity. In this work, we describe the preparation of flower-like three-dimensional (3D) nanostructures of birnessite MnO2 through an electrochemical conversion reaction from γ-MnS. This 3D birnessite MnO2 exhibited a total capacity of ~360 mAh/g in aqueous electrolyte for the initial cycle. We further characterized the insertion of Mg2+ ions in the atomic layers of MnO2 nanoflowers using scanning transmission electron microscopy (STEM) technique, revealing the energy storage mechanism of Mg2+ ions in 3D, ion-accessible MnO2 nanostructures.",
keywords = "Aqueous battery, Birnessite, In-situ conversion, Intercalation, Mg-ion insertion, MnO",
author = "Cheng Zhang and Xun Zhan and Talha Al-Zoubi and Yanling Ma and Shih, {Pei Chieh} and Fangfang Wang and Wenxiang Chen and Saran Pidaparthy and Stephens, {Ryan M.} and Qian Chen and Zuo, {Jian Min} and Hong Yang",
note = "Funding Information: Jian-Min Zuo is Ivan Racheff professor of Materials Science and Engineering at University of Illinois. He received his Ph.D. in Physics from Arizona State University (ASU) in 1989. He then took a three-year postdoctoral fellowship at the National Science Foundation center for high resolution electron microscopy and the Physics department at ASU. He co-authored two books on Electron Microdiffraction and Advanced Transmission Electron Microscopy with John Spence. His research focuses on the advancement of electron diffraction and microscopy and understanding of structure-property relationships in a broad range of materials. Funding Information: This work is supported in part by the Energy & Biosciences Institute through the EBI-Shell program. Y. M. and F. W. thank a scholarship from China Scholarship Council (CSC). Electron microscopy characterizations were carried out at the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois. The X-ray diffraction was carried out at the George L. Clark X-ray Facility and 3 M Materials Laboratory, School of Chemical Science at University of Illinois at Urbana-Champaign. Funding Information: This work is supported in part by the Energy & Biosciences Institute through the EBI-Shell program. Y. M. and F. W. thank a scholarship from China Scholarship Council (CSC). Electron microscopy characterizations were carried out at the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois. The X-ray diffraction was carried out at the George L. Clark X-ray Facility and 3 M Materials Laboratory, School of Chemical Science at University of Illinois at Urbana-Champaign. Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",
year = "2022",
month = nov,
doi = "10.1016/j.nanoen.2022.107696",
language = "English (US)",
volume = "102",
journal = "Nano Energy",
issn = "2211-2855",
publisher = "Elsevier BV",
}