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Enhancing the Rate Capability of Niobium Oxide Electrode through Rare‐Earth Doping Engineering
Author(s) -
Yin Dandan,
Zhao Hongyang,
Li Na,
Si Rui,
Sun Xiaolei,
Li Xinghua,
Du Yaping
Publication year - 2019
Publication title -
batteries and supercaps
Language(s) - English
Resource type - Journals
ISSN - 2566-6223
DOI - 10.1002/batt.201900069
Subject(s) - doping , materials science , niobium , electrode , niobium oxide , oxide , amorphous solid , electrochemistry , nanotechnology , optoelectronics , chemical engineering , analytical chemistry (journal) , metallurgy , chemistry , crystallography , engineering , chromatography
Niobium oxide is considered one of the most promising electrode materials for ultrafast electrochemical energy storage devices with high energy density. In this work, we first found that trace amounts (<1 %) of Yb 3+ doping remarkably enhanced the rate capability of T−Nb 2 O 5 , which was further proved to be because of the formation of a thin layer of amorphous YbNbO x . The capacity of YbNbO x ‐coated Nb 2 O 5 reached 124 mAh g −1 at 20 C, which is the highest value reported among pristine Nb 2 O 5 electrodes. Besides, we found that doping with other rare‐earth elements such as Nd 3+ , Sm 3+ , and Gd 3+ can also improve the rate capability of T−Nb 2 O 5 . It can be concluded that rare‐earth doping can be an effective and robust method to enhance the intrinsic rate performance of electrode materials without complicated modifications.