Po rous ceria(CeO_(2)) nanoparticles and iron-doped porous ceria with different iron co ntents(1 wt%,2.5 wt%,5 wt% and 10 wt%) were prepared using a one-pot simple process.Several characterization techniques were appl...Po rous ceria(CeO_(2)) nanoparticles and iron-doped porous ceria with different iron co ntents(1 wt%,2.5 wt%,5 wt% and 10 wt%) were prepared using a one-pot simple process.Several characterization techniques were applied to characterize the prepared materials,including inductively coupled plasma(ICP)ele mental analysis,X-ray diffraction(XRD),Fourier transform infrared(FTIR),N_(2) sorption measure ments,scanning electron microscopy(SEM),high resolution-transmission electron microscopy(HR-TEM),and DR-UV-Vis.The obtained results confirm the incorporation of iron ions in the CeO_(2) lattice,with no evidence for the formation of iron oxide as a separate phase.More importantly,the light absorption property of Fe-doped porous ceria samples is found to be red-shifted and the calculated bandgap decreases from 3.08 to 2.66 eV for pure porous ceria and 10 wt% Fe-doped ceria,respectively.Under the illumination of visible light,the photocatalytic activity of Fe-doped porous ceria was investigated through the decolourization reaction of methyl green aqueous solution as a model contaminant in industrial wastewater.The obtained photocatalytic data show a remarkable increase in activity by almost4.8 times higher compared to a pure ceria sample.Furthermore,the prepared Fe-doped ceria sample exhibits good reusability up to the fourth consecutive reaction without treatment.Moreover,the bestperforming sample was further investigated in two additional photocatalytic reactions;the first is the elimination of phenol in an aqueous solution,while the second is the degradation of a gas mixture containing four short-chain hydrocarbon gases.The results of both reactions confirm the great improvement in the photocatalytic performance of Fe-doped porous ceria compared to a pure porous ceria sample.展开更多
Seawater electrolysis holds great promise for sustainable green hydrogen production,but it is challenged by chloride-induced corrosion.Herein,we demonstrate the hydrothermal preparation of Pb-doped NiFe layered double...Seawater electrolysis holds great promise for sustainable green hydrogen production,but it is challenged by chloride-induced corrosion.Herein,we demonstrate the hydrothermal preparation of Pb-doped NiFe layered double hydroxide on Ni foam(Pb-NiFe LDH/NF)for alkaline seawater oxidation electrocatalysis.Our Pb-NiFe LDH/NF requires a low overpotential of only 381 mV to attain a current density of 1000 mA·cm^(-2),superior to its NiFe LDH/NF counterpart(423 mV).Additionally,it operates continuously for 1000 h with negligible performance degradation and minimal active chlorine production.In situ Raman spectroscopy analysis reveals that Pb incorporation facilitates catalyst surface reconstruction,thereby enhancing oxygen evolution reaction activity.Importantly,Pb selectively adsorbs free Cl^(-)to form stable Pb-Cl species under the influence of an applied electric field.This process creates a Cl^(-)-free layer near the anode surface,thereby enhancing the catalyst’s chlorine corrosion resistance.展开更多
Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions.However,the high concentration of chloride ions(Cl-)in seawater triggers competi...Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions.However,the high concentration of chloride ions(Cl-)in seawater triggers competitive chemical reactions and severe corrosion,posing a challenge to the durability of the anode.In this study,we present a hexafluoroantimonate-intercalated NiFe layered double hydroxide nanosheet array on Ni foam(SbF_(6)^(-)-NiFe LDH/NF),which serves as a highly active and stable electrocatalyst for alkaline seawater oxidation(ASO).SbF_(6)^(-)-NiFe LDH/NF requires only an overpotential of 379 mV to achieve a current density of 1000 mA cm^(-2),significantly outperforming NiFe LDH/NF(396 mV).Furthermore,it exhibits excellent long-term stability over 600 hours at 1000 mA cm^(-2),with only trace amounts of active chlorine detected during the ASO process.In situ Raman spectroscopy confirms that the insertion of SbF_(6)^(-)into the LDH layers promotes the formation of active sites.More importantly,SbF_(6)^(-)efficiently repels Cl-,thus providing robust protection to the anode.This development represents a significant advancement in the design of noble-metal-free,durable anode electrodes for ASO.展开更多
基金the Deanship of Scientific Research at King Khalid University,Saudi Arabia,for funding support through large group Research Project under Grant No. RGP2/236/44。
文摘Po rous ceria(CeO_(2)) nanoparticles and iron-doped porous ceria with different iron co ntents(1 wt%,2.5 wt%,5 wt% and 10 wt%) were prepared using a one-pot simple process.Several characterization techniques were applied to characterize the prepared materials,including inductively coupled plasma(ICP)ele mental analysis,X-ray diffraction(XRD),Fourier transform infrared(FTIR),N_(2) sorption measure ments,scanning electron microscopy(SEM),high resolution-transmission electron microscopy(HR-TEM),and DR-UV-Vis.The obtained results confirm the incorporation of iron ions in the CeO_(2) lattice,with no evidence for the formation of iron oxide as a separate phase.More importantly,the light absorption property of Fe-doped porous ceria samples is found to be red-shifted and the calculated bandgap decreases from 3.08 to 2.66 eV for pure porous ceria and 10 wt% Fe-doped ceria,respectively.Under the illumination of visible light,the photocatalytic activity of Fe-doped porous ceria was investigated through the decolourization reaction of methyl green aqueous solution as a model contaminant in industrial wastewater.The obtained photocatalytic data show a remarkable increase in activity by almost4.8 times higher compared to a pure ceria sample.Furthermore,the prepared Fe-doped ceria sample exhibits good reusability up to the fourth consecutive reaction without treatment.Moreover,the bestperforming sample was further investigated in two additional photocatalytic reactions;the first is the elimination of phenol in an aqueous solution,while the second is the degradation of a gas mixture containing four short-chain hydrocarbon gases.The results of both reactions confirm the great improvement in the photocatalytic performance of Fe-doped porous ceria compared to a pure porous ceria sample.
基金funding this work through Large Research Project under Grant(No.RGP2/28/46).
文摘Seawater electrolysis holds great promise for sustainable green hydrogen production,but it is challenged by chloride-induced corrosion.Herein,we demonstrate the hydrothermal preparation of Pb-doped NiFe layered double hydroxide on Ni foam(Pb-NiFe LDH/NF)for alkaline seawater oxidation electrocatalysis.Our Pb-NiFe LDH/NF requires a low overpotential of only 381 mV to attain a current density of 1000 mA·cm^(-2),superior to its NiFe LDH/NF counterpart(423 mV).Additionally,it operates continuously for 1000 h with negligible performance degradation and minimal active chlorine production.In situ Raman spectroscopy analysis reveals that Pb incorporation facilitates catalyst surface reconstruction,thereby enhancing oxygen evolution reaction activity.Importantly,Pb selectively adsorbs free Cl^(-)to form stable Pb-Cl species under the influence of an applied electric field.This process creates a Cl^(-)-free layer near the anode surface,thereby enhancing the catalyst’s chlorine corrosion resistance.
基金appreciation to the Deanship of Research and Graduate Studies at King Khalid University for funding this work through Large Research Project under Grant number RGP2/28/46.
文摘Renewable electricity-driven seawater electrolysis for hydrogen production offers substantial potential for sustainable energy solutions.However,the high concentration of chloride ions(Cl-)in seawater triggers competitive chemical reactions and severe corrosion,posing a challenge to the durability of the anode.In this study,we present a hexafluoroantimonate-intercalated NiFe layered double hydroxide nanosheet array on Ni foam(SbF_(6)^(-)-NiFe LDH/NF),which serves as a highly active and stable electrocatalyst for alkaline seawater oxidation(ASO).SbF_(6)^(-)-NiFe LDH/NF requires only an overpotential of 379 mV to achieve a current density of 1000 mA cm^(-2),significantly outperforming NiFe LDH/NF(396 mV).Furthermore,it exhibits excellent long-term stability over 600 hours at 1000 mA cm^(-2),with only trace amounts of active chlorine detected during the ASO process.In situ Raman spectroscopy confirms that the insertion of SbF_(6)^(-)into the LDH layers promotes the formation of active sites.More importantly,SbF_(6)^(-)efficiently repels Cl-,thus providing robust protection to the anode.This development represents a significant advancement in the design of noble-metal-free,durable anode electrodes for ASO.
