摘要
为了提高双电解液体系镁空气电池的放电性能,选择在0.6mol/L NaCl电解液中加入水溶性石墨烯。采用改进的Hummers法制备了氧化石墨烯(GO),在GO的基础上制备出还原氧化石墨烯(RGO)和水溶性石墨烯(PG)。采用X射线衍射仪、傅里叶变换红外光谱仪以及扫描电子显微镜对所制石墨烯进行了结构以及形貌的表征。研究了镁阳极在加入不同浓度PG的NaCl溶液中的电化学性能和组装成电池之后的放电性能。结果表明:在0.6mol/L NaCl电液液中加入PG后的镁空气电池放电性能得到很好的提升,其中Mg(ClO_(4))_(2)-AN/NaCl+0.5g/L PG双电解液体系镁空气电池1mA/cm~2放电时放电性能最好,阳极利用率为89%,能量密度为2840Wh/kg,且放电电压可达到1.42V。电化学测试表明镁阳极在加入PG的NaCl电解液中有着较高的电化学活性。
In order to improve the discharge performance of dual-electrolyte Mg-air battery,water-soluble graphene was added to the 0.6mol/L NaCl electrolyte to prepare graphene oxide(GO)by modified Hummer method,and then,on the basis of GO,reduced graphene oxide(RGO)and water-soluble graphene(PG)were obtained.The structure and surface morphology of the prepared graphene were characterized by X-ray diffraction(XRD),Fourier transform infrared spectrometer(FT-IR)and scanning electron microscope(SEM).The electrochemical performance of magnesium anode in NaCl solution with different concentrations of PG and the discharge performance after being assembled into battery were studied.The results showed that the discharge performance of Mg-air batter was significantly improved after adding PG in 0.6mol/L electrolyte,among them,the discharge performance of Mg(ClO_(4))_2-AN/NaCl+0.5g/L PG dual-electrolyte liquid Mg-air battery was the best at 1mA/cm~2 discharge,the anode utilization rate was 89%,the energy density was 2840Wh/kg,and the discharge voltage could reach 1.42V.The electrochemical test revealed that Mg anode had high electrochemical activity in NaCl electrolyte with PG.
作者
马明生
马景灵
张毅
贾兴良
张晨飞
Ma Mingsheng;Ma Jingling;Zhang Yi;Jia Xingliang;Zhang Chenfei(Research Center for High Purity Materials,Henan University of Science and Technology,Luoyang 471023;Collaborative Innovation Center of Nonferrous Metals,Henan University of Science and Technology,Luoyang 471023)
出处
《化工新型材料》
CAS
CSCD
北大核心
2023年第4期158-163,共6页
New Chemical Materials
关键词
石墨烯
双电解液
镁空气电池
放电性能
电化学
graphene
dual electrolyte
Mg-air battery
discharge performance
electrochemistry
