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Electronic Structure Control of Tungsten Oxide Activated by Ni for Ultrahigh‐Performance Supercapacitors
Author(s) -
Meng Tian,
Kou Zongkui,
Amiinu Ibrahim Saana,
Hong Xufeng,
Li Qingwei,
Tang Yongfu,
Zhao Yufeng,
Liu Shaojun,
Mai Liqiang,
Mu Shichun
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201800381
Subject(s) - pseudocapacitor , materials science , supercapacitor , tungsten , oxide , capacitance , doping , density functional theory , nanotechnology , fermi level , electrode , optoelectronics , electron , metallurgy , chemistry , computational chemistry , physics , quantum mechanics
Tuning the electron structure is of vital importance for designing high active electrode materials. Here, for boosting the capacitive performance of tungsten oxide, an atomic scale engineering approach to optimize the electronic structure of tungsten oxide by Ni doping is reported. Density functional theory calculations disclose that through Ni doping, the density of state at Fermi level for tungsten oxide can be enhanced, thus promoting its electron transfer. When used as electrode of supercapacitors, the obtained Ni‐doped tungsten oxide with 4.21 at% Ni exhibits an ultrahigh mass‐specific capacitance of 557 F g −1 at the current density of 1 A g −1 and preferable durability in a long‐term cycle test. To the best of knowledge, this is the highest supercapacitor performance reported so far in tungsten oxide and its composites. The present strategy demonstrates the validity of the electronic structure control in tungsten oxide via introducing Ni atoms for pseudocapacitors, which can be extended to other related fields as well.