首页|Multiscale control of MnO2 growth via[WO6]-perturbed[MnO6]assembly toward a favorable balance between capacitance and rate performance

Multiscale control of MnO2 growth via[WO6]-perturbed[MnO6]assembly toward a favorable balance between capacitance and rate performance

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Although pseudocapacitive manganese dioxide(MnO2)integrates the high-power merit of carbonaceous materials with the high-energy merit of battery-type materials,it still has a long way to go in achieving a more satisfactory balance of higher energy and power density,and in decoupling the relationship of structural character-istics with energy storage performance.To realize such goals,a bottom-up[WO6]-perturbed[MnO6]assembly strategy has been developed here due to their similar structure,yet mismatched lattice parameters.This facile protocol is capable of finely controlling the morphology and crystal structure of MnO2 by adjusting its internal[WO6]concentration.Therefore,the as-prepared Wx-MnO2 is treated as an ideal platform to scrutinize the correlations of the structure with the energy storage per-formance.The operando Raman spectra and finite element analysis have fully demonstrated the superiority of the locally ordered defects-enriched structure of W0.02-MnO2,which could reach a favorable balance between the ion diffusion equilibrium time and the number of active sites.As a result,the W0.02-MnO2 is able to deliver a high capacitance of 292 F·g-1 at a current density of 1 A·g-1 and a remarkable rate performance with a 60％ capacity retention at a current density of 50 A·g-1.The further unveiled structure-performance relationship provides a guideline for the design of better pseudocapacitive energy storage devices.

SupercapacitorsPseudocapacitive materialsMnO2Tungsten dopingCrystal structure regulation

Jin-Kang Liu、Tian-Shuo Yang、Zhi-Bin Ren、Adekunle-Adedapo Obisanya、Xin-Yi Tan、Yan-Di Rao、Jun-Shuang Zhou、Fa-Ming Gao、Jian-Ren Wang

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Hebei Key Laboratory of Applied Chemistry,Yanshan University,Qinhuangdao 06604,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of Hebei ProvinceHebei Province Foundation for the National Natural Science Foundationsubsidy for Hebei Key Laboratory of Applied Chemistry after Operation Performance

2210516421875205B2022203009206Z4404G22567616H

2024

10.1007/s12598-023-02542-3

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(4)
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