The lanthanum aluminum mesoporous materials were synthesized using sodium dodecyl sulfate as a template agent by ultrasonic hydrothermal method.The resulting samples were characterized by low angle X-ray diffraction（...The lanthanum aluminum mesoporous materials were synthesized using sodium dodecyl sulfate as a template agent by ultrasonic hydrothermal method.The resulting samples were characterized by low angle X-ray diffraction（XRD）,N2 adsorption-desorption studies,transmission electron microscopy（TEM）and surface morphology analysis（SEM）,surface acid（NH3-TPD）,reducibility properties（TPR）,X-ray energy dispersive spectrometer（EDS）and thermogravimetric analysis（TG/DTG）.A l/La composite mesoporous material were synthesized with n（Al）︰n（La）=70︰1.0,80°C of reaction temperature,20 h of reaction time,12 h of crystallization time,650°C of calcination temperature.The specific surface area of the sample is 273.90 m 2 ·g ？1 ,with the average diameter 5.642 nm and pore volume 0.2354 cm 3 ·g ？1 .The samples have mesoporous structure and its particles are similar to a worm-shaped tubular structure.The influence of calcination temperature on the surface physical and chemical properties of Al/La composited mesoporous materials was examined,and the results showed that the acid strength was increased but the amount of acidic sites is decreased as the calcination temperature increased.It was found that the sample calcined at 650°C had appropriate acid content,acid strength and better reducibility.展开更多
In this study,aqueous organic redox flow batteries(AORFBs)with NaCl as supporting electrolyte were investigated.In AORFBs,the chlorine evolution reaction should be retarded,not the hydrogen evolution reaction.To enhan...In this study,aqueous organic redox flow batteries(AORFBs)with NaCl as supporting electrolyte were investigated.In AORFBs,the chlorine evolution reaction should be retarded,not the hydrogen evolution reaction.To enhance the catalytic activity of the graphite fel(GF)electrode,the metal oxides were proposed to decorate on the GF surface.Among the loading oxides,significant enhancement of the mass transfer and reaction activity was obtained by the presence of LaSrOx nanoparticles.X-Ray photoclectron spectroscopy and contact angle measurements revealed that the content of oxygen-containing groups and the hydrophilicity were remarkably inereased.After the electrode assem-bled in the battery,the LaSrO/GF electrode presented huge enhancement of the battery performance,obviously increasing in the battery capacity and efficiency.At a current of 50 Am/cm^(2),the energy efficiency(EE)of the battery increased from 54.76%to 61.37%by the LaSrO/GF electrode.Furthermore,the cyclability of the system tested that no obviously fading was observed after 100 cycles,signifying the excellent stability of the LaSrOx/GF electrode.展开更多
文摘The lanthanum aluminum mesoporous materials were synthesized using sodium dodecyl sulfate as a template agent by ultrasonic hydrothermal method.The resulting samples were characterized by low angle X-ray diffraction（XRD）,N2 adsorption-desorption studies,transmission electron microscopy（TEM）and surface morphology analysis（SEM）,surface acid（NH3-TPD）,reducibility properties（TPR）,X-ray energy dispersive spectrometer（EDS）and thermogravimetric analysis（TG/DTG）.A l/La composite mesoporous material were synthesized with n（Al）︰n（La）=70︰1.0,80°C of reaction temperature,20 h of reaction time,12 h of crystallization time,650°C of calcination temperature.The specific surface area of the sample is 273.90 m 2 ·g ？1 ,with the average diameter 5.642 nm and pore volume 0.2354 cm 3 ·g ？1 .The samples have mesoporous structure and its particles are similar to a worm-shaped tubular structure.The influence of calcination temperature on the surface physical and chemical properties of Al/La composited mesoporous materials was examined,and the results showed that the acid strength was increased but the amount of acidic sites is decreased as the calcination temperature increased.It was found that the sample calcined at 650°C had appropriate acid content,acid strength and better reducibility.
基金Supported by the Natural Science Foundation of Jiangsu Province,China(No.BK20160297).
文摘In this study,aqueous organic redox flow batteries(AORFBs)with NaCl as supporting electrolyte were investigated.In AORFBs,the chlorine evolution reaction should be retarded,not the hydrogen evolution reaction.To enhance the catalytic activity of the graphite fel(GF)electrode,the metal oxides were proposed to decorate on the GF surface.Among the loading oxides,significant enhancement of the mass transfer and reaction activity was obtained by the presence of LaSrOx nanoparticles.X-Ray photoclectron spectroscopy and contact angle measurements revealed that the content of oxygen-containing groups and the hydrophilicity were remarkably inereased.After the electrode assem-bled in the battery,the LaSrO/GF electrode presented huge enhancement of the battery performance,obviously increasing in the battery capacity and efficiency.At a current of 50 Am/cm^(2),the energy efficiency(EE)of the battery increased from 54.76%to 61.37%by the LaSrO/GF electrode.Furthermore,the cyclability of the system tested that no obviously fading was observed after 100 cycles,signifying the excellent stability of the LaSrOx/GF electrode.
