Framework Doping of Ni Enhances Pseudocapacitive Na-Ion Storage of (Ni)MnO2 Layered Birnessite

Year: 2019

Type: article

Abstract: We report a (Ni)MnO 2 layered birnessite material with a framwork doping of Ni ions as the cathode for much enhanced aqueous Na-ion storage. Characterized by neutron total scattering and pair distribution function (PDF) analysis, in situ XRD, in situ X-ray PDF, XANES, and XPS, the synergistic interaction between disordered [NiO 6 ] and ordered [MnO 6 ] octahedra contribute to the enhanced specific capacity and cycle life (63 mAh g –1 at 0.2 A g –1 after 2000 full-cell cycles). Electro-kinetic analysis and structural characterizations show that stable local structure is maintained by [MO 6 ] octahedra during charge–discharge processes, while disordered [NiO 6 ] octahedra significantly improve pseudocapacitive redox charge storage. This finding may pave a new way for designing a new type of low-cost and high performance layered electrode materials.

Source: Chemistry of Materials

DOI: 10.1021/acs.chemmater.9b02568

Authors: Xiaoqiang Shan, Fenghua Guo, Katharine Page, Joerg C. Neuefeind, Bruce Ravel, A. M. Milinda Abeykoon, Gihan Kwon, Daniel Olds, Dong Su, Xiaowei Teng

Institutions: University of New Hampshire, Oak Ridge National Laboratory, National Institute of Standards and Technology, National Synchrotron Light Source II, Brookhaven National Laboratory, Center for Functional Nanomaterials

Language: English

Topic: Supercapacitor Materials and Fabrication

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

Funders: U.S. Department of Energy, Office of Science, Basic Energy Sciences, Oak Ridge National Laboratory, Brookhaven National Laboratory

OpenAlex ID: W2979610627