Mn掺杂和还原氧化石墨烯复合对NiAl-LDHs超级电容性能影响

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射线衍射仪、扫描电子显微镜、能谱仪、X射线光电子能谱、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。研究发现：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1345F/g，在5A/g循环1000次后容量保持率为82.9%。

Effect of Mn doping and compositing with reduced graphene on the performance of NiAl-LDHs supercapacitors

Layered double hydroxides (LDHs) NiAl-LDHs, NiMnAl-LDHs and the composites combined with LDHs and reduced graphene oxide were prepared by hydro-thermal method. The structure and electrochemical performances were tested by X-ray diffractometer, scanning electron microscope, energy spectrometer, X ray photoelectron spectroscopy, Raman spectroscopy and electrochemical workstation for researching on effect of Mn doped and reduced graphene oxidation on supercapacitive properties.We found that Mn doped can reduce the crystallinity and lamellar size of LDHs which improved the dispersion and decreased the internal resistance of materials, leading to the increased specific capacity and the ratio performance. After compositing with reduced grapheme oxide, further increasing the electrical conductivity and the specific capacity. Especially, the NiAl-LDHs/rGO sample presented the highest specific capacitance which reached 1345F/g at 1A/g, and the capacity retention rate was 82.9% after 1000 cycles at 5A/g.