Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window,ChemNanoMat

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Oxygen Vacancy‐Engineered Ti−Mo−Ni Ternary Oxide Nanotubes as Binder‐Free Supercapacitor Electrodes with Exceptional Potential Window
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-07-29 , DOI: 10.1002/cnma.202000357
Nourhan M. Deyab _{1,

2} , Nashaat Ahmed ₁ , Nageh K. Allam ₁

Affiliation

The charge storage performance of metal oxides as electrochemical supercapacitor electrodes is limited by their poor conductivity and limited operating potential window. Herein, we report on the oxygen‐vacancy engineering of Ti−Mo−Ni−O nanotubes via hydrogen annealing to boost their capacitive performance. Hydrogen treatment of the nanotubes resulted in 110% increase in specific capacitance as compared to the air‐annealed counterpart with excellent stability over 3700 cycles and an exceptional capacitance retention of 99%. The observed enhancement can be ascribed to the faradaic capacitance contribution from the several redox pairs of Nickel, Molybdenum, and Ti³⁺. This was further confirmed via the electrochemical impedance spectroscopy measurements, revealing a drastic decrease in the internal resistance upon hydrogen treatment. We hope our demonstrated two‐step interfacial engineering opens a new strategy to design high performance electrode materials for advanced electrochemical supercapacitors.

中文翻译：

氧空位设计的Ti-Mo-Ni三元氧化物纳米管作为无粘结剂超级电容器电极，具有出色的电位窗口

金属氧化物作为电化学超级电容器电极的电荷存储性能受到其导电性差和工作电势窗口有限的限制。在本文中，我们报告了通过氢退火提高Ti-Mo-Ni-O纳米管的电容性能的氧空位工程。与空气退火的纳米管相比，对碳纳米管进行氢气处理后，其比电容增加了110％，在3700个循环中具有出色的稳定性，并具有99％的出色电容保持率。观察到的增强可以归因于镍，钼和Ti ³⁺的几个氧化还原对的法拉第电容贡献。通过电化学阻抗谱测量进一步证实了这一点，表明氢处理后内阻急剧降低。我们希望我们经过验证的两步界面工程技术为设计用于高级电化学超级电容器的高性能电极材料开辟了新战略。

更新日期：2020-07-29

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