Layered double hydroxides(LDHs)have been shown to be efficient photocatalysts for the nitrogen fixation reaction.However,the effect of interlayer anions on the catalytic performance has not yet been reported.Herein,th...Layered double hydroxides(LDHs)have been shown to be efficient photocatalysts for the nitrogen fixation reaction.However,the effect of interlayer anions on the catalytic performance has not yet been reported.Herein,the anion regulated channel of LDHs blocked by carbonate(Car)was opened by controlling the suberate(Sub)intercalation.展开更多
Layered double hydroxide（LDH） comprising of Co^2＋ and La^3＋-ions with acetate counter anion was successfully synthesized by hydrogen peroxide catalyzed hydrolysis reaction and characterized extensively. The observ...Layered double hydroxide（LDH） comprising of Co^2＋ and La^3＋-ions with acetate counter anion was successfully synthesized by hydrogen peroxide catalyzed hydrolysis reaction and characterized extensively. The observed reflections in the powder X-ray diffraction pattern could be indexed in P3 space group with a=0.316 nm and c=2.97 nm. Lattice fringes of distances corresponding to the peaks observed in X-ray diffraction pattern were observed in high resolution transmission electron microscopic images. UV-visible diffuse reflectance spectroscopy results confirmed the presence of Co（OH）6 along with the presence of charge-transfer band due to the interlayer carboxylate anion. Magnetization measurements at room temperature indicated high spin configuration of Co^2＋-ion in the sample exhibiting paramagnetic behavior. The mixed metal oxide from calcination was used to reconstruct the parent layered structure. Intercalation experiments with other organic anions in Co-La LDH proved be successful.展开更多
Hydrogen production through seawater electrolysis represents a promising route for sustainable energy conversion.Nevertheless,its practical implementation is impeded by severe chloride‐induced corrosion and the compe...Hydrogen production through seawater electrolysis represents a promising route for sustainable energy conversion.Nevertheless,its practical implementation is impeded by severe chloride‐induced corrosion and the competing chlorine evolution reaction(CER),both of which predominantly affect the anodic oxygen evolution reaction(OER)and consequently deteriorate the overall efficiency and long‐term operational stability of the seawater electrolysis system for sustained hydrogen generation.To address these issues,this study introduces a Ni3N selective anion‐gating interlayer(SAGI)on a nickel foam substrate.This SAGI increases the electron density at the catalyst surface,effectively repelling Cl^(−)ions from the nickel foam skeleton while allowing OH^(−)ions to access the NiFeAl‐LDH catalytic surface.As a result,the electrolyzer requires only 1.92 and 2.12 V to achieve current densities of 400 and 1000 mA cm^(−2),respectively.Moreover,the electrode demonstrates excellent durability,showing only a 5.8%and 13.6%increase in cell voltage after 500 h of continuous operation at 400 mA cm^(−2) in simulated and real alkaline seawater,respectively.This strategy is broadly applicable,extending the operational lifespan of various seawater electrolysis catalysts by 2-10 times,offering a promising approach to developing corrosion‐resistant,high‐performance electrocatalysts for direct seawater splitting.展开更多
基金supported by the National Natural Science Foundation of China(22065030 and 21965027)the National Natural Science Foundation of Ningxia Province(2022AAC03109)+1 种基金the Undergraduate Innovation Program of Ningxia Province(202210749371)the National First-Rate Discipline Construction Project of Ningxia:Chemical Engineering and Technology(grant no.NXY-LXK2017A04).
文摘Layered double hydroxides(LDHs)have been shown to be efficient photocatalysts for the nitrogen fixation reaction.However,the effect of interlayer anions on the catalytic performance has not yet been reported.Herein,the anion regulated channel of LDHs blocked by carbonate(Car)was opened by controlling the suberate(Sub)intercalation.
基金Project supported by DST(SB/S1/PC-08/2012)Govt. of India and University of Delhi under the “Scheme to Strengthen R&D Doctoral Research Program” and DU-DST PURSE Grant
文摘Layered double hydroxide（LDH） comprising of Co^2＋ and La^3＋-ions with acetate counter anion was successfully synthesized by hydrogen peroxide catalyzed hydrolysis reaction and characterized extensively. The observed reflections in the powder X-ray diffraction pattern could be indexed in P3 space group with a=0.316 nm and c=2.97 nm. Lattice fringes of distances corresponding to the peaks observed in X-ray diffraction pattern were observed in high resolution transmission electron microscopic images. UV-visible diffuse reflectance spectroscopy results confirmed the presence of Co（OH）6 along with the presence of charge-transfer band due to the interlayer carboxylate anion. Magnetization measurements at room temperature indicated high spin configuration of Co^2＋-ion in the sample exhibiting paramagnetic behavior. The mixed metal oxide from calcination was used to reconstruct the parent layered structure. Intercalation experiments with other organic anions in Co-La LDH proved be successful.
基金National Natural Science Foundation of China,Grant/Award Number:U23A20684。
文摘Hydrogen production through seawater electrolysis represents a promising route for sustainable energy conversion.Nevertheless,its practical implementation is impeded by severe chloride‐induced corrosion and the competing chlorine evolution reaction(CER),both of which predominantly affect the anodic oxygen evolution reaction(OER)and consequently deteriorate the overall efficiency and long‐term operational stability of the seawater electrolysis system for sustained hydrogen generation.To address these issues,this study introduces a Ni3N selective anion‐gating interlayer(SAGI)on a nickel foam substrate.This SAGI increases the electron density at the catalyst surface,effectively repelling Cl^(−)ions from the nickel foam skeleton while allowing OH^(−)ions to access the NiFeAl‐LDH catalytic surface.As a result,the electrolyzer requires only 1.92 and 2.12 V to achieve current densities of 400 and 1000 mA cm^(−2),respectively.Moreover,the electrode demonstrates excellent durability,showing only a 5.8%and 13.6%increase in cell voltage after 500 h of continuous operation at 400 mA cm^(−2) in simulated and real alkaline seawater,respectively.This strategy is broadly applicable,extending the operational lifespan of various seawater electrolysis catalysts by 2-10 times,offering a promising approach to developing corrosion‐resistant,high‐performance electrocatalysts for direct seawater splitting.
