CAJ | 학술논문

通过带负电荷的MnO2纳米片与带正电荷的Co-Ni层状双氢氧化物(LDHs)纳米片的静电自组装外加后续热处理合成了异质层状结构的MnO2/NiCo2O4复合物.采用X射线衍射(XRD)、傅里叶变换红外(FTIR)光谱、拉曼光谱、原子吸收光谱(AAS)、场发射扫描电镜(FESEM)和透射电子显微镜(TEM)对其结构和形貌进行了表征.用循环伏安(CV)、恒流充放电和电化学交流阻抗技术对其电化学性能进行了测试.研究结果表明,该方法制得的异质复合物具有多孔层状堆垛结构,这种特殊的结构不仅增大了电解液离子的接触面积,而且还为其嵌入-脱出提供了有效途径.该复合物在1 A?g-1电流密度时,-0.6-0.45 V电位窗口内的比电容达482 F?g-1,优于纯组分MnO2和NiCo2O4的电容性能.
통과대부전하적MnO2납미편여대정전하적Co-Ni층상쌍경양화물(LDHs)납미편적정전자조장외가후속열처리합성료이질층상결구적MnO2/NiCo2O4복합물.채용X사선연사(XRD)、부리협변환홍외(FTIR)광보、랍만광보、원자흡수광보(AAS)、장발사소묘전경(FESEM)화투사전자현미경(TEM)대기결구화형모진행료표정.용순배복안(CV)、항류충방전화전화학교류조항기술대기전화학성능진행료측시.연구결과표명,해방법제득적이질복합물구유다공층상퇴타결구,저충특수적결구불부증대료전해액리자적접촉면적,이차환위기감입-탈출제공료유효도경.해복합물재1 A?g-1전류밀도시,-0.6-0.45 V전위창구내적비전용체482 F?g-1,우우순조분MnO2화NiCo2O4적전용성능.
A hetero-layered MnO2/NiCo2O4 composite was fabricated according to an electrostatic self-assembly process between negatively charged MnO2-layered nanosheets and positively charged Co-Ni-layered double hydroxide nanosheets, fol owed by a heat-treatment process. The morphology, composition, and microstructure characteristics of the resulting material were characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectrometry, atomic absorption spectrometry (AAS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Furthermore, the electrochemical behaviors of the composite were evaluated by cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS). The test results indicated that the hetero-layered composite showed porous stacking structure, which increased the effective liquid-solid interfacial area, and provided a fast path for the insertion and extraction of electrolyte ions. A specific capacitance of 482 F?g-1 was obtained in the potential window from -0.6 to 0.45 V at a current density of 1 A?g-1. These values were therefore superior to those of pure MnO2 or pure NiCo2O4.