An oxygen reduction reaction(ORR)catalyst is a crucial component of metal–air batteries.Herein,modified carbon nanotubes are used to support iron phthalocyanine,followed by the fabrication of single-atom and cluster ...An oxygen reduction reaction(ORR)catalyst is a crucial component of metal–air batteries.Herein,modified carbon nanotubes are used to support iron phthalocyanine,followed by the fabrication of single-atom and cluster coexisting catalysts by the fast microwave method.The two catalysts have Fe–N_(5)and Fe–P–N_(4)coordination structures,respectively.Electrochemical tests show that the FeNC/Fe–N_(5)–C and FeNC/Fe–P–N_(4)–C catalysts have half-wave potentials of 0.906 and 0.886 V in an alkaline solvent,respectively.The Zn–air battery prepared with the FeNC/Fe–N_(5)–C catalyst has a specific capacity of 791 mA h g^(−1)and a maximum power density of 190 mW cm^(−2).DFT calculations show that the axial coordination bonds in FeNC/Fe–N_(5)–C and FeNC/Fe–P–N_(4)–C are conducive to the acceleration of the transfer of electrons.The d-band centers of the axial coordination Fe–N_(5)and Fe–P–N_(4)are closer to the Fermi level,confirming that the presence of the axial coordination bonds enhances the adsorption of the reaction intermediates and reduces the ORR barriers.展开更多
A series of N-doped graphene(NG)and TiO_2 supported MnO_x–CeO_2 catalysts were prepared prepared by a hydrothermal method.The catalysts with different molar ratios of Mn/Ce(6:1,10:1,15:1)were investigated for the low...A series of N-doped graphene(NG)and TiO_2 supported MnO_x–CeO_2 catalysts were prepared prepared by a hydrothermal method.The catalysts with different molar ratios of Mn/Ce(6:1,10:1,15:1)were investigated for the low-temperature selective catalytic reduction(SCR)of NO_x with NH_3.The synthesized catalysts were characterized by HRTEM,SEM,XRD,BET,XPS,and NH_3-TPD technologies.The characterization results indicated that manganese and cerium oxide particles dispersed on the surface of the TiO_2–NG support uniformly,and that manganese and cerium oxides existed in different valences on the surface of the TiO_2–NG support.At Mn element loading of 8 wt%,MnO_x–CeO_2(10:1)/TiO_2–1%NG displayed superior activity and improved SO_(2 )resistance.On the basis of the catalyst characterization,excellent catalytic performance and SO_2 tolerance at low temperature were attributed to the high content of manganese with high oxidation valence,extensive oxidation of NO into NO_2 by CeO_2 and strong NO adsorption capacity,and electron transfer of N-doped graphene.展开更多
Dear Editor,Nasopharyngeal carcinoma(NPC)is a common malignancy in East and Southeast Asia,especially in South China.The etiology of NPC has been linked to genetic susceptibility,Epstein-Barr virus(EBV)infection,and e...Dear Editor,Nasopharyngeal carcinoma(NPC)is a common malignancy in East and Southeast Asia,especially in South China.The etiology of NPC has been linked to genetic susceptibility,Epstein-Barr virus(EBV)infection,and environmental factors.Accumulated evidence including multiple genome-wide association studies(GWASs)has revealed robust genetic predisposition of NPC.However,GWAS-identified genetic variants collectively account for only 8.2%of NPC heritability[1].The underlying inherited predisposition is largely undetermined.The strongest genetic signal for NPC consistently hits the human leukocyte antigen(HLA)region on 6p21[2].However,the highly polymorphic nature and complicated long-range linkage disequilibrium(LD)in the HLA region particularly obscure the causal variants driving the association.In addition,most genetic variants located in introns or intergenic regions.The causal genes mediating genetic effects on NPC risk have rarely been ascertained by GWAS alone.展开更多
Awe has been theorized as a kind of self-transcendence emotion that has an important impact on individual social behavior.Based on the self-transcendence of awe,this study examined how awe can increase small-self and ...Awe has been theorized as a kind of self-transcendence emotion that has an important impact on individual social behavior.Based on the self-transcendence of awe,this study examined how awe can increase small-self and self-other inclusion to facilitate cooperation among individuals across three studies(N=1162).First,the relationship between awe,cooperative propensity,and the mediating role of small-self and self-other inclusion in the relationship was examined using questionnaires on trait levels(Study 1).Second,awe emotions were induced from the state level through behavioral experiments to verify the facilitative effect on cooperative behavior in multiple rounds of public goods dilemma(Study 2).Third,by adding the induction of negative awe to discuss the impact of different valence of awe on cooperative behavior,the mediating role of small-self and self-other inclusion was supported(Study 3).Results show that awe has a facilitative effect on cooperation,which provides strong evidence for the positive social function of self-transcendent emotional awe.展开更多
基金supported by the National Natural Science Foundation of China(52362036)the Science and Technology Plan Project of Gansu Province(23JRRA691).
文摘An oxygen reduction reaction(ORR)catalyst is a crucial component of metal–air batteries.Herein,modified carbon nanotubes are used to support iron phthalocyanine,followed by the fabrication of single-atom and cluster coexisting catalysts by the fast microwave method.The two catalysts have Fe–N_(5)and Fe–P–N_(4)coordination structures,respectively.Electrochemical tests show that the FeNC/Fe–N_(5)–C and FeNC/Fe–P–N_(4)–C catalysts have half-wave potentials of 0.906 and 0.886 V in an alkaline solvent,respectively.The Zn–air battery prepared with the FeNC/Fe–N_(5)–C catalyst has a specific capacity of 791 mA h g^(−1)and a maximum power density of 190 mW cm^(−2).DFT calculations show that the axial coordination bonds in FeNC/Fe–N_(5)–C and FeNC/Fe–P–N_(4)–C are conducive to the acceleration of the transfer of electrons.The d-band centers of the axial coordination Fe–N_(5)and Fe–P–N_(4)are closer to the Fermi level,confirming that the presence of the axial coordination bonds enhances the adsorption of the reaction intermediates and reduces the ORR barriers.
基金financially supported by the Program of Frontier Exploration Fund of China Building Materials Academy,"the whole process of air pollution control on new technology research" (No. 2016YFC0209302)
文摘A series of N-doped graphene(NG)and TiO_2 supported MnO_x–CeO_2 catalysts were prepared prepared by a hydrothermal method.The catalysts with different molar ratios of Mn/Ce(6:1,10:1,15:1)were investigated for the low-temperature selective catalytic reduction(SCR)of NO_x with NH_3.The synthesized catalysts were characterized by HRTEM,SEM,XRD,BET,XPS,and NH_3-TPD technologies.The characterization results indicated that manganese and cerium oxide particles dispersed on the surface of the TiO_2–NG support uniformly,and that manganese and cerium oxides existed in different valences on the surface of the TiO_2–NG support.At Mn element loading of 8 wt%,MnO_x–CeO_2(10:1)/TiO_2–1%NG displayed superior activity and improved SO_(2 )resistance.On the basis of the catalyst characterization,excellent catalytic performance and SO_2 tolerance at low temperature were attributed to the high content of manganese with high oxidation valence,extensive oxidation of NO into NO_2 by CeO_2 and strong NO adsorption capacity,and electron transfer of N-doped graphene.
基金the National Key Research and Development Program of China(2021YFC2500400)the Basic and Applied Basic Research Foundation of Guangdong Province,China(2021B1515420007)+4 种基金Sino-Sweden Joint Research Programme(81861138006)the Science and Technology Planning Project of Guangzhou,China(201804020094)the Special Support Program for High-level Professionals on Scientific and Technological Innovation of Guangdong Province,China(2014TX01R201)National Natural Science Foundation of China(81973131,81903395,81803319,82003520)National Science Fund for Distinguished Young Scholars of China(81325018).
文摘Dear Editor,Nasopharyngeal carcinoma(NPC)is a common malignancy in East and Southeast Asia,especially in South China.The etiology of NPC has been linked to genetic susceptibility,Epstein-Barr virus(EBV)infection,and environmental factors.Accumulated evidence including multiple genome-wide association studies(GWASs)has revealed robust genetic predisposition of NPC.However,GWAS-identified genetic variants collectively account for only 8.2%of NPC heritability[1].The underlying inherited predisposition is largely undetermined.The strongest genetic signal for NPC consistently hits the human leukocyte antigen(HLA)region on 6p21[2].However,the highly polymorphic nature and complicated long-range linkage disequilibrium(LD)in the HLA region particularly obscure the causal variants driving the association.In addition,most genetic variants located in introns or intergenic regions.The causal genes mediating genetic effects on NPC risk have rarely been ascertained by GWAS alone.
文摘Awe has been theorized as a kind of self-transcendence emotion that has an important impact on individual social behavior.Based on the self-transcendence of awe,this study examined how awe can increase small-self and self-other inclusion to facilitate cooperation among individuals across three studies(N=1162).First,the relationship between awe,cooperative propensity,and the mediating role of small-self and self-other inclusion in the relationship was examined using questionnaires on trait levels(Study 1).Second,awe emotions were induced from the state level through behavioral experiments to verify the facilitative effect on cooperative behavior in multiple rounds of public goods dilemma(Study 2).Third,by adding the induction of negative awe to discuss the impact of different valence of awe on cooperative behavior,the mediating role of small-self and self-other inclusion was supported(Study 3).Results show that awe has a facilitative effect on cooperation,which provides strong evidence for the positive social function of self-transcendent emotional awe.
