Infrared(IR)thermal imaging has aroused great interest due to its wide application in medical,scientific,and military fields.Most reported approaches for regulating thermal radiation are aimed to realize IR camouflage...Infrared(IR)thermal imaging has aroused great interest due to its wide application in medical,scientific,and military fields.Most reported approaches for regulating thermal radiation are aimed to realize IR camouflage and are not applicable to enhance thermal imaging.Here,we introduce a simple and effective method to process porous glass by femtosecond laser scanning,where distributed nanocavities and nanowires were produced,which caused improvement of the treated glass emissivity.The as-prepared sample possessed better IR thermal radiation performance but lower transmittance to visible light.We also demonstrated its applicability by placing it in different backgrounds,where the IR image temperature of laser-treated glass was closer to the actual environment,and this strategy may provide a new vision for enhanced thermal imaging.展开更多
Surface strain engineering is considered as an effective strategy to promote the electrocatalytic properties of noble metal nanocrystals.Herein,we construct a dual-phase palladium-copper(DP-PdCu)bimetallic electrocata...Surface strain engineering is considered as an effective strategy to promote the electrocatalytic properties of noble metal nanocrystals.Herein,we construct a dual-phase palladium-copper(DP-PdCu)bimetallic electrocatalyst with remarkable biaxial strain via a one-pot wet-chemical approach for formic acid oxidation.The biaxial strain originates from the lattice mismatch between the disordered face-centered cubic(FCC)phase and ordered body-centered cubic(BCC)phase in each of DP-PdCu:nanoparticles.The proportion of FCC and BCC phases and size of PdCu nanoparticles are dependent on the addition amount of:capping agent,cetyltrimethylammonium bromide(CTAB).Density functional theory calculations reveal the downshift of d-band:center of Pd atoms due to the interfacial strain,which weakens the adsorption strength of undesired intermediates.These merit the,DP-PdCu catalyst with superior mass activity of 0.55 A·mg_(pd)^(-1) and specific activity of 1.91 mA·cm_(pd)^(-2) toward formic acid oxidation,outperforming the single FCC/EICC PdCu and commercial Pd/C catalysts.This will provide new insights into the structure design of high-performance electrocatalysts via strain engineering.展开更多
Na-O_(2) and K-O_(2) batteries have attracted extensive attention in recent years.However,the parasitic reactions involving the discharge product of NaO_(2) or K anode with electrolytes and the severe Na or K dendrite...Na-O_(2) and K-O_(2) batteries have attracted extensive attention in recent years.However,the parasitic reactions involving the discharge product of NaO_(2) or K anode with electrolytes and the severe Na or K dendrites plague their rechargeability and cycle stability.Herein,we report a hybrid Na//K^(+)-containing electrolyte//O_(2) battery consisting of a Na anode,1.0 M of potassium trifate in diglyme,and a porous carbon cathode.Upon discharging,KO_(2) is preferentially produced via oxygen reduction in the cathode with Na+stripped from the Na anode,and reversely,the KO_(2) is electrochemically decomposed with Na+plated back onto the anode.Te new reaction pathway can circumvent the parasitic reactions involving instable NaO_(2) and active K anode,and alternatively,the good stability and conductivity of KO_(2) and stable Na stripping/plating in the presence of K^(+) enable the hybrid battery to exhibit an average discharge/charge voltage gap of 0.15 V,high Coulombic efciency of>96%,and superior cycling stability of 120 cycles.Tis will pave a new pathway to promote metal-air batteries.展开更多
基金support of National Natural Science Foundation of China(52171215)Tianjin Natural Science Foundation(19JCJQJC62400)Haihe Laboratory of Sustainable Chemical Transformations。
基金This work was supported by the National Natural Science Foundation of China(Nos.52075557 and 51805553)Natural Science Foundation of Hunan Province(No.2021JJ20067)+1 种基金Science and Technology Innovation Program of Hunan Province(No.2021RC3011)We thank Wuhan Huaray Ultrafast Fiber Laser Technology Co,Ltd.for their support.
文摘Infrared(IR)thermal imaging has aroused great interest due to its wide application in medical,scientific,and military fields.Most reported approaches for regulating thermal radiation are aimed to realize IR camouflage and are not applicable to enhance thermal imaging.Here,we introduce a simple and effective method to process porous glass by femtosecond laser scanning,where distributed nanocavities and nanowires were produced,which caused improvement of the treated glass emissivity.The as-prepared sample possessed better IR thermal radiation performance but lower transmittance to visible light.We also demonstrated its applicability by placing it in different backgrounds,where the IR image temperature of laser-treated glass was closer to the actual environment,and this strategy may provide a new vision for enhanced thermal imaging.
基金supported by the National Key Research and Development Program of China(No.2016YFB0101201)the National Natural Science Foundation of China(Nos.21822506 and 51761165025)the 111 project of B12015.
文摘Surface strain engineering is considered as an effective strategy to promote the electrocatalytic properties of noble metal nanocrystals.Herein,we construct a dual-phase palladium-copper(DP-PdCu)bimetallic electrocatalyst with remarkable biaxial strain via a one-pot wet-chemical approach for formic acid oxidation.The biaxial strain originates from the lattice mismatch between the disordered face-centered cubic(FCC)phase and ordered body-centered cubic(BCC)phase in each of DP-PdCu:nanoparticles.The proportion of FCC and BCC phases and size of PdCu nanoparticles are dependent on the addition amount of:capping agent,cetyltrimethylammonium bromide(CTAB).Density functional theory calculations reveal the downshift of d-band:center of Pd atoms due to the interfacial strain,which weakens the adsorption strength of undesired intermediates.These merit the,DP-PdCu catalyst with superior mass activity of 0.55 A·mg_(pd)^(-1) and specific activity of 1.91 mA·cm_(pd)^(-2) toward formic acid oxidation,outperforming the single FCC/EICC PdCu and commercial Pd/C catalysts.This will provide new insights into the structure design of high-performance electrocatalysts via strain engineering.
基金Financial support from National Key R&D Program of China(2017YFA0206700)NSFC(grant No.21603108&51671107)+1 种基金National Natural Science Foundation of ChinaResearch Grants Council of Hong Kong joint project(NSFCRGC project of 51761165025)the 111 project of B12015 is acknowledged.
文摘Na-O_(2) and K-O_(2) batteries have attracted extensive attention in recent years.However,the parasitic reactions involving the discharge product of NaO_(2) or K anode with electrolytes and the severe Na or K dendrites plague their rechargeability and cycle stability.Herein,we report a hybrid Na//K^(+)-containing electrolyte//O_(2) battery consisting of a Na anode,1.0 M of potassium trifate in diglyme,and a porous carbon cathode.Upon discharging,KO_(2) is preferentially produced via oxygen reduction in the cathode with Na+stripped from the Na anode,and reversely,the KO_(2) is electrochemically decomposed with Na+plated back onto the anode.Te new reaction pathway can circumvent the parasitic reactions involving instable NaO_(2) and active K anode,and alternatively,the good stability and conductivity of KO_(2) and stable Na stripping/plating in the presence of K^(+) enable the hybrid battery to exhibit an average discharge/charge voltage gap of 0.15 V,high Coulombic efciency of>96%,and superior cycling stability of 120 cycles.Tis will pave a new pathway to promote metal-air batteries.
