【摘要】 采用水热法制备了水滑石(Layered Double Hydroxides,LDHs)NiAl-LDHs、NiMnAl-LDHs及其分别与还原氧化石墨烯(reduced Graphene Oxide,rGO)的复合材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、X射线光电子能谱(XPS)、拉曼光谱、电化学工作站对合成的材料进行了结构形貌和电化学性能表征,并研究了Mn离子掺杂和rGO复合对超级电容性能的影响。结果表明,Mn离子掺杂降低了LDHs的结晶度和片层尺寸,提高了分散性,降低了内阻,使倍率性能提高;与rGO复合后,导电性和比容量进一步提高,其中NiAl-LDHs/rGO具有最高比电容,在1A/g时达1 345F/g,在5A/g循环1 000次后容量保持率为82.9%。更多还原

【Abstract】 Layered Double Hydroxides(LDHs)NiAl-LDHs,NiMnAl-LDHs,the composites combined with LDHs and the reduced Graphene Oxide(rGO)were prepared by hydro-thermal method.The structure and electrochemical synthesize materials performances were tested by X-Ray Diffractometer(XRD),Scanning Electron microscope(SEM),Energy Dispersive Spectrometer(EDS),X-ray Photoelectron Spectroscopy(XPS),Raman spectra,and electrochemical workstation.And the effects of Mn doping and rGO on supercapacitors were investigated.The results show that Mn doping reduces the crystallinity and lamellar size of LDHs,improves the dispersibility,decreases the internal resistance,and improves the rate performance.After compounding with rGO,the conductivity and specific capacity are further improved,among which NiAl-LDHs/rGO has the highest specific capacitance reaching 1 345 F/g at 1 A/g,and the capacity retention rate is 82.9% after 1 000 cycles at 5 A/g.更多还原