调控用于超级电容器应用的分级MoO/CdO二元异质结构的电化学性能。

Tuning the electrochemical performance of a hierarchical MoO/CdO binary heterostructure for supercapacitor applications.

作者信息

Roy Probal, Zubair Md Abdullah, Islam Muhammad Rakibul

机构信息

Department of Physics, Bangladesh University of Engineering and Technology Dhaka Bangladesh.

Department of Nanomaterials and Ceramic Engineering, Bangladesh University of Engineering and Technology Dhaka Bangladesh

出版信息

Nanoscale Adv. 2025 Jul 22. doi: 10.1039/d5na00491h.

DOI:10.1039/d5na00491h

PMID:40801045

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12337772/

Abstract

Cadmium oxide (CdO)-incorporating molybdenum trioxide (MoO) nanocomposites were synthesized using a facile hydrothermal method by varying the CdO content (1%, 3%, and 5%) to comprehend the influence of CdO concentration on the electrochemical performance of MoO. The structural and morphological properties of the synthesized nanomaterials were characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). XRD showed that MoO has an orthorhombic structure, and FE-SEM showed that it has a nanobelt shape (0.8-3.2 μm long and 100-228 nm wide) with CdO nanoparticles grown on its surface. Electrochemical properties were analyzed through cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS). The 3%CdO-incorporating MoO electrode exhibited a higher specific capacitance of 671 F g at a current density of 0.50 A g, while the pristine MoO shows 386 F g. Kinetic analysis of CV data indicates that redox processes in the nanocomposite electrodes involve both capacitive and diffusion-controlled mechanisms. The MoO/CdO (3%) electrode showed low charge transfer resistance (2.35 Ω) and series resistance (6.20 Ω), enabling faster faradaic redox reactions and improved electrochemical performance. Moreover, the MoO/CdO (3%) electrode demonstrated excellent cycling stability, retaining more than 92% of its initial specific capacitance after 5000 cycles. The incorporation of CdO enhances the diffusion pathways within the nanocomposites, potentially boosting their conductivity and specific capacitance. The symmetric supercapacitor MoO/CdO (3%)//MoO/CdO (3%) exhibited a notable operating voltage of 1.6 V, achieving an energy density of 124 W h kg at a power density of 1067 W kg. It also exhibited a capacitance retention of 88.9% after 5000 cycles at a current density of 15 A g, highlighting its potential for energy storage applications.

摘要

采用简便的水热法，通过改变氧化镉（CdO）含量（1%、3%和5%）合成了含氧化镉（CdO）的三氧化钼（MoO₃）纳米复合材料，以了解CdO浓度对MoO₃电化学性能的影响。使用X射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）对合成的纳米材料的结构和形态特性进行了表征。XRD表明MoO₃具有正交结构，FE-SEM表明其具有纳米带形状（长0.8 - 3.2μm，宽100 - 228nm），表面生长有CdO纳米颗粒。通过循环伏安法（CV）、恒电流充放电（GCD）和电化学阻抗谱（EIS）分析了电化学性能。含3%CdO的MoO₃电极在电流密度为0.50 A g⁻¹时表现出更高的比电容，为671 F g⁻¹，而原始MoO₃的比电容为386 F g⁻¹。CV数据的动力学分析表明，纳米复合电极中的氧化还原过程涉及电容控制和扩散控制机制。MoO₃/CdO（3%）电极显示出低电荷转移电阻（2.35Ω）和串联电阻（6.20Ω），能够实现更快的法拉第氧化还原反应并改善电化学性能。此外，MoO₃/CdO（3%）电极表现出优异的循环稳定性，在5000次循环后保留了超过92%的初始比电容。CdO的掺入增强了纳米复合材料中的扩散途径，可能提高其导电性和比电容。对称超级电容器MoO₃/CdO（3%）//MoO₃/CdO（3%）表现出1.6 V的显著工作电压，在功率密度为1067 W kg⁻¹时实现了124 W h kg⁻¹的能量密度。在电流密度为15 A g⁻¹的情况下，经过5000次循环后，其电容保持率为88.9%，突出了其在储能应用中的潜力。