超级电容器
材料科学
阳极
电极
电容
电流密度
碳纤维
电化学
纳米技术
化学工程
功率密度
碳化
储能
复合材料
复合数
化学
扫描电子显微镜
物理化学
工程类
功率(物理)
物理
量子力学
作者
Sohaila Z. Noby,Ankita Mohanty,Peymen Zirak,Ananthakumar Ramadoss,Lukas Schmidt-Mende
标识
DOI:10.1016/j.jallcom.2022.165530
摘要
Molybdenum oxide (MoO3) is an appropriate electrode material for vast applications such as gas sensing, catalyst, and energy storage devices. Its high oxidation states provide the possibility for ion intercalation and de-intercalation to the electrode material, which is truly advantageous for supercapacitor application. Herein, we report about reduced vertically aligned α-MoO3 nanoblades on conducting substrates via a post-treatment in reduced gas environments (H2, N2 and vacuum) to tune their conductivity by introducing oxygen vacancies. These α-MoO3 nanoblades were further carbonized through decomposition of glucose as a carbohydrate material to obtain binder-free carbon coated vertically aligned α-MoO3 electrode. As a binder-free supercapacitor negative electrode, the vacuum treated α-MoO3 electrode showed the highest specific capacitance (39.8 mF cm−2), as compared to that achieved by N2 and H2 treated samples (29.2 mF cm−2 and 24.5 mF cm−2, respectively). Besides, the vacuum annealed electrode also maintained around 76.4% of its initial specific capacitance value after 10,000 cycles indicating a more stable electrochemical performance of such electrode. An asymmetric device 3D-MnO2//α-MoO3 was assembled and it attained maximum specific capacitance value of 37.5 mF/cm2 at current density value 1.5 mA cm− 2 and maximum energy density value of 16.875 µWh cm-2 at power density value of 675 µW cm-2. The results demonstrate that the proposed hybrid synthesis approach is very promising for preparation of binder-free materials for high-performance supercapacitors.
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