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Self‐Templated Formation of Uniform NiCo 2 O 4 Hollow Spheres with Complex Interior Structures for Lithium‐Ion Batteries and Supercapacitors
Author(s) -
Shen Laifa,
Yu Le,
Yu XinYao,
Zhang Xiaogang,
Lou Xiong Wen David
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201409776
Subject(s) - spheres , materials science , oxide , supercapacitor , nanotechnology , lithium (medication) , metal , nanoparticle , annealing (glass) , thermal treatment , chemical engineering , complex oxide , electrochemistry , electrode , composite material , chemistry , physics , metallurgy , medicine , astronomy , engineering , endocrinology
Despite the significant advancement in preparing metal oxide hollow structures, most approaches rely on template‐based multistep procedures for tailoring the interior structure. In this work, we develop a new generally applicable strategy toward the synthesis of mixed‐metal‐oxide complex hollow spheres. Starting with metal glycerate solid spheres, we show that subsequent thermal annealing in air leads to the formation of complex hollow spheres of the resulting metal oxide. We demonstrate the concept by synthesizing highly uniform NiCo 2 O 4 hollow spheres with a complex interior structure. With the small primary building nanoparticles, high structural integrity, complex interior architectures, and enlarged surface area, these unique NiCo 2 O 4 hollow spheres exhibit superior electrochemical performances as advanced electrode materials for both lithium‐ion batteries and supercapacitors. This approach can be an efficient self‐templated strategy for the preparation of mixed‐metal‐oxide hollow spheres with complex interior structures and functionalities.