储能科学与技术2026，Vol.15Issue(5)：1704-1715,12.DOI:10.19799/j.cnki.2095-4239.2026.0131
钼掺杂二氧化锰电极材料的制备及其超电性能研究
Synthesis and supercapacitive performance of molybdenum-doped manganese dioxide electrode materials
摘要
Abstract
The practical application of manganese dioxide(MnO2)in supercapacitors is limited by the difficulty of concurrently achieving high energy and power density.This study addresses this limitation through a"bottom-up"structural tuning strategy in which[MoO6]units,whose octahedral parameters closely match those of the host[MnO6],are introduced into the MnO2 lattice during hydrothermal synthesis to perturb[MnO6]octahedral assembly and enable precise structural modification.The[MoO6]concentration proved to be a critical parameter governing the resulting morphology,crystal phase,and defect density.Scanning electron microscopy(SEM)and transmission electron microscopy(TEM)confirmed pronounced morphological changes upon[MoO6]incorporation,while X-ray photoelectron spectroscopy(XPS)and high-resolution TEM(HRTEM)revealed the formation of additional oxygen vacancies and a disordered local structure.Electrochemical measurements showed that the optimally doped sample(Mo0.05-MnO2)achieved a specific capacitance of 158.9 F/g at 5 mV/s and retained 68％of this value at 200 mV/s.The role of[MoO6]in charge storage was further investigated by in situ electrochemical impedance spectroscopy,from which ion diffusion coefficients were determined for electrodes across a range of doping levels.Finite element analysis indicated that moderate[MoO6]doping produces a defect-rich yet locally ordered structure that optimally balances active-site density and ion diffusion relaxation time,thereby enhancing both energy and power density simultaneously.These findings establish a viable route for synthesizing high-performance Mo-doped MnO2 electrodes and clarify the underlying structure-performance relationship,offering design guidelines for advanced pseudocapacitive materials.关键词
超级电容器/二氧化锰/结构缺陷/离子扩散/构效关系Key words
supercapacitor/manganese dioxide/structural defect/ion diffusion/structure-property relationship分类
通用工业技术引用本文复制引用
杨添铄,王建韧,高发明..钼掺杂二氧化锰电极材料的制备及其超电性能研究[J].储能科学与技术,2026,15(5):1704-1715,12.基金项目
国家自然科学基金(22105164和22379112) （22105164和22379112）
河北省自然科学基金(B2025203011),河北省科技厅项目(C20230506和BJ20260701). （B2025203011）
