title: Chemical insights into the roles of nanowire cores on the growth and supercapacitor performances of Ni-Co-O/Ni(OH)₂ core/shell electrodes.
abstract: Nanostructured core/shell electrodes have been experimentally demonstrated promising for high-performance electrochemical energy storage devices. However, chemical insights into the significant roles of nanowire cores on the growth of shells and their supercapacitor behaviors still remain as a research shortfall. In this work, by substituting 1/3 cobalt in the Co3O4 nanowire core with nickel, a 61% enhancement of the specific mass-loading of the Ni(OH)2 shell, a tremendous 93% increase of the volumetric capacitance and a superior cyclability were achieved in a novel NiCo2O4/Ni(OH)2 core/shell electrode in contrast to a Co3O4/Ni(OH)2 one. A comparative study suggested that not only the growth of Ni(OH)2 shells but also the contribution of cores were attributed to the overall performances. Importantly, their chemical origins were revealed through a theoretical simulation of the core/shell interfacial energy changes. Besides, asymmetric supercapacitor devices and applications were also explored. The scientific clues and practical potentials obtained in this work are helpful for the design and analysis of alternative core/shell electrode materials.
authors: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors: Xuesong
authors: X
authors: Yin
authors: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors: Chunhua
authors: C
authors: Tang
authors: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors: Liuyang
authors: L
authors: Zhang
authors: Institute of High Performance Computing, 1 Fusionopolis Way, Singapore 138632, Singapore.
authors: Zhi Gen
authors: ZG
authors: Yu
authors: Department of Materials Science and Engineering, National University of Singapore, 117576, Singapore.
authors: Hao
authors: H
authors: Gong