Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications.Herein,a facile self-template strategy is applied to prepare Fe7Se8 architectures with a monolithic structur...Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications.Herein,a facile self-template strategy is applied to prepare Fe7Se8 architectures with a monolithic structure via a self-synthesized single precursor and subsequent calcination at high temperature.With the support of oleylamine,the precursor is structurally targeted to engineer the Fe7Se8 microstructure,featuring nanorod bundles arranged along the longitudinal direction.Because of their ordered hierarchical structure,the Fe7Se8 nanorod bundles deliver a high reversible capacity of 300 m Ah g^-1 at 0.5 A g^-1,along with exceptional rate capability up to 20 A g^-1 and long-term cycle life over 8000 cycles,which represents the highest stability of Fe7Se8 anodes for sodium-ion batteries reported to date.The feasibility of the present strategy to prepare metal selenide structures highlights its promising potential for the rational and effective engineering of electrode materials responsible for the electrochemical performance of energy storage systems.展开更多
As environmentally benign and high-efficiency energy storage devices,sodium-ion capacitors(SICs),which combine the merits of batteries and supercapacitors,are considered to have potentially high energy/power densities...As environmentally benign and high-efficiency energy storage devices,sodium-ion capacitors(SICs),which combine the merits of batteries and supercapacitors,are considered to have potentially high energy/power densities and long lifespan.However,the lack of high-rate anodes that can match the high-power-density cathode hinders the commercial application of SICs.In this work,heterostructured Fe/FeSe_(2)/Fe_(3)Se_(4)nanocomposite is pre-pared by chemical vapor deposition(CVD)method and investigated as the anode for SICs.Through heterointerface manipulation,Fe/FeSe_(2)/Fe_(3)Se_(4)demonstrates better sodium ion storage performances than the pure FeSe_(2)and FeSe_(2)/Fe_(3)Se_(4).It can deliver a specific capacity of 484.8 mAh·g^(-1)after 100 cycles at 0.5 A·g^(-1),as well as a good capacity retention.The excellent performance of Fe/FeSe_(2)/Fe_(3)Se_(4)nanocomposite can be ascribed to the synergistic effect of the heterointerface engineered components,where FeSe_(2)and Fe_(3)Se_(4) are responsible for offering a high capacity and metallic Fe can server as mini-current collectors,effec-tively accelerating the electron and charge transfer behavior.Meanwhile,the heterointerface significantly facilitates the sodium ion fast transport,and retards the structural variation during cycling.FeSe-1000//activated carbon(AC)SIC affords a high energy density of 112 Wh·kg^(-1)at 107.5 W·kg^(-1),its power density can achieve 10,750 W·kg^(-1)with remained energy density of 44.2 Wh·kg^(-1),as well as an outstanding cycling stability,demonstrating this effective heterointerface engineered anode strategy for high-performance SICs.展开更多
Tumor cell resistance is one of the big hurdles limiting the therapeutic efficacy of tumor necrosis factorrelated apoptosis-inducing ligand(TRAIL)-based cancer treatment.Therefore,the development of a sa fe and effect...Tumor cell resistance is one of the big hurdles limiting the therapeutic efficacy of tumor necrosis factorrelated apoptosis-inducing ligand(TRAIL)-based cancer treatment.Therefore,the development of a sa fe and effective sensitizer agent is greatly desired for optimizing TRAIL therapy.Herein,we successfully developed a Se/Fe complex with low toxicity to highly effectively inhibit tumor cells proliferation and migration capabilities through down-regulating ER stress related selenoproteins.Furthermore,it could more efficiently damage tumor spheroids with good penetration capability.More importantly,it could synergize with TRAIL treatment to induce the robust generation of reactive oxygen species(ROS),downregulating ER stress related selenoproteins for triggering tumor cells apoptosis in extrinsic and intrinsic signaling pathways.Taken together,this study provides a potential chemo-drug and sensitizer agent to improve the therapeutic efficacy of TRAIL-based cancer treatment.展开更多
We investigated the effect of processing conditions on the structure and physical properties of the polycrystalline samples of Ca0.8Fe2Se2 prepared via solid state reaction. X-ray diffraction showed that the main phas...We investigated the effect of processing conditions on the structure and physical properties of the polycrystalline samples of Ca0.8Fe2Se2 prepared via solid state reaction. X-ray diffraction showed that the main phase became FeSe when the sintering temperature increased above 350 ℃. The temperature dependence of magnetization （M-T curves） recorded in zero-field-cooled mode by SQUID magnetometer showed some bumps at around 120 K to 140 K. These bumps moved to lower temperatures when the processing temperature increased above 550 ℃. On the other hand, pure FeSe materials produced at 900 ℃ for 24 h showed a sharp superconducting transition Tconset = 8.16 K and the critical current density of 6,252 A/cm2 at 5 K, self-field. SEM results indicated an enhanced grain connectivity.展开更多
In this study,we present a convenient method to obtain two types of novel tetra-substituted Fe/Se salts through a dehalogenation reaction,aiming to advance research on mimicking the FeⅡFeⅡ oxidation state of[FeFe]-H...In this study,we present a convenient method to obtain two types of novel tetra-substituted Fe/Se salts through a dehalogenation reaction,aiming to advance research on mimicking the FeⅡFeⅡ oxidation state of[FeFe]-H_(2) ases.Initially,by treating[Fe_(2)(μ-SeBn)_(2)(CO)_(4)(dppv)](Bn=CH_(2)C_(6)H_(5),dppv=cis-1,2-bis(diphenylphosphino)ethylene)with one equivalent of dppv under UV and reflux conditions,the neutral FeIFeI and FeⅡFeⅡ precursors[Fe_(2)(μ-SeBn)_(2)(CO)_(2)(dppv)_(2)](1)and[Fe_(2)(μ-SeBn)_(2)(μ-Se)(CO)_(2)(dppv)_(2)](2)were successfully isolated in good yields.Subsequently,1 underwent dehalogenation reactions with halocarbons(such as CCl_(4) and CBr4)or I_(2),leading to the formation of tetra-substituted salts[Fe_(2)(μ-SeBn)_(2)(μ-X)(CO)_(2)(dppv)_(2)]+(X=Cl,Br,and I)([3]Cl,[4]Br and[5]I_(3)).GC-MS analysis of the reaction with carbon tetrachloride detected the formation of the homo-coupled product CCl_(3)-CCl_(3)(m/z=235),indicating the presence of a CCl_(3)·species.Notably,2 also exhibited intriguing reactivity with R-X and I_(2).Unlike 1,the reaction of 2 with RX or I_(2) involved cleavage of the C-Se bond,leading to the isolation of[Fe_(2)(μ-SeBn)(μ-Se_(2))(CO)_(2)(dppv)_(2)]+X-(X=Cl,Br,I_(3))([6]Cl,[6]Br and[6]I_(3))in good yields.The reaction involved debenzylation of 2 and was confirmed by GC-MS detection of C6H5CH_(2)CCl_(3)(m/z=208)in the reaction with CCl_(4),suggesting a radical pathway.展开更多
FeSe films have attracted extensive research interest in iron-based superconductors owing to their highly tunable superconducting properties.Here,we fabricated a series of Fe Se films with various thicknesses on Li F ...FeSe films have attracted extensive research interest in iron-based superconductors owing to their highly tunable superconducting properties.Here,we fabricated a series of Fe Se films with various thicknesses on Li F substrates using pulsed-laser deposition.展开更多
During the last few years,the electrocatalytic nitrogen reduction reaction(NRR)has provided an environmentally friendly and promising alternative to the Haber–Bosch process.However,due to the competing hydrogen evolu...During the last few years,the electrocatalytic nitrogen reduction reaction(NRR)has provided an environmentally friendly and promising alternative to the Haber–Bosch process.However,due to the competing hydrogen evolution reaction and the hard-to-break strong NuN bond with high bond energy(941 kJ mol^(-1)),the synthesis of efficient NRR catalysts is still a challenge.Herein,we report a cost-effective layered double hydroxide(LDH)derived bimetallic NiFe selenide(Ni_(0.75)Fe_(0.25)Se_(2))in Li_(2)SO_(4)solution for NRR under ambient conditions,which exhibits an NH_(3)yield rate of 5.64μg h^(-1)cm^(-2)_(cat)and faradaic efficiency of 12.3%at−0.1 V vs.RHE,being superior to those of pristine NiFe–LDH,NiSe_(2),and FeSe_(2)as well as several state-of-the-art noble metal catalysts.The high electrocatalytic NRR activity and selectivity of Ni_(0.75)Fe_(0.25)Se_(2)demonstrate the first example of NiFe selenide catalyst with a facile synthesis strategy towards efficient nitrogen fixation.展开更多
基金the National Natural Science Foundation of China(21871164)the Natural Science Foundation of Shandong Province(ZR2019MB024)the Taishan Scholar Project of Shandong Province(no.ts201511004).
文摘Ordered hierarchical architectures are attractive candidates for electrochemical energy storage applications.Herein,a facile self-template strategy is applied to prepare Fe7Se8 architectures with a monolithic structure via a self-synthesized single precursor and subsequent calcination at high temperature.With the support of oleylamine,the precursor is structurally targeted to engineer the Fe7Se8 microstructure,featuring nanorod bundles arranged along the longitudinal direction.Because of their ordered hierarchical structure,the Fe7Se8 nanorod bundles deliver a high reversible capacity of 300 m Ah g^-1 at 0.5 A g^-1,along with exceptional rate capability up to 20 A g^-1 and long-term cycle life over 8000 cycles,which represents the highest stability of Fe7Se8 anodes for sodium-ion batteries reported to date.The feasibility of the present strategy to prepare metal selenide structures highlights its promising potential for the rational and effective engineering of electrode materials responsible for the electrochemical performance of energy storage systems.
基金financially supported by the Natural Science Foundation of Hebei Province of China(Nos.E2021202011 and E2018202123)Jian-Hua Research Foundation of Hebei University of Technology(No.HB1921)+4 种基金High-strength,Highprecision,Superconducting Rail Transit Aluminum Research and Development and Industrialization Projects(No.2019TSLH0110)"One Belt,One Road"Technology Innovation Cooperation Project of Tianjin(No.18PTZWHZ00220)Ministry of Science and Higher Education of the Russian Federation as part of World-class Research Center program(No.075-15-2020-934)Foundation of Strengthening Program(No.2019-JCJQ-142-00)the Exchange Project of the Third Meeting of the Science and Technology Cooperation Subcommittee of the China-Ukraine Intergovernmental Cooperation Committee(No.CU03-11).
文摘As environmentally benign and high-efficiency energy storage devices,sodium-ion capacitors(SICs),which combine the merits of batteries and supercapacitors,are considered to have potentially high energy/power densities and long lifespan.However,the lack of high-rate anodes that can match the high-power-density cathode hinders the commercial application of SICs.In this work,heterostructured Fe/FeSe_(2)/Fe_(3)Se_(4)nanocomposite is pre-pared by chemical vapor deposition(CVD)method and investigated as the anode for SICs.Through heterointerface manipulation,Fe/FeSe_(2)/Fe_(3)Se_(4)demonstrates better sodium ion storage performances than the pure FeSe_(2)and FeSe_(2)/Fe_(3)Se_(4).It can deliver a specific capacity of 484.8 mAh·g^(-1)after 100 cycles at 0.5 A·g^(-1),as well as a good capacity retention.The excellent performance of Fe/FeSe_(2)/Fe_(3)Se_(4)nanocomposite can be ascribed to the synergistic effect of the heterointerface engineered components,where FeSe_(2)and Fe_(3)Se_(4) are responsible for offering a high capacity and metallic Fe can server as mini-current collectors,effec-tively accelerating the electron and charge transfer behavior.Meanwhile,the heterointerface significantly facilitates the sodium ion fast transport,and retards the structural variation during cycling.FeSe-1000//activated carbon(AC)SIC affords a high energy density of 112 Wh·kg^(-1)at 107.5 W·kg^(-1),its power density can achieve 10,750 W·kg^(-1)with remained energy density of 44.2 Wh·kg^(-1),as well as an outstanding cycling stability,demonstrating this effective heterointerface engineered anode strategy for high-performance SICs.
基金the National Natural Science Foundation of China(Nos.21877049,31871006)National Program for Support of Top-notch Young Professionals(No.W02070191)+1 种基金Major Program for Tackling Key Problems of Industrial Technology in Guangzhou(No.201902020013)Dedicated Fund for Promoting High-Quality Marine Economic Development in Guangdong Province(No.GDOE-2019-A31)。
文摘Tumor cell resistance is one of the big hurdles limiting the therapeutic efficacy of tumor necrosis factorrelated apoptosis-inducing ligand(TRAIL)-based cancer treatment.Therefore,the development of a sa fe and effective sensitizer agent is greatly desired for optimizing TRAIL therapy.Herein,we successfully developed a Se/Fe complex with low toxicity to highly effectively inhibit tumor cells proliferation and migration capabilities through down-regulating ER stress related selenoproteins.Furthermore,it could more efficiently damage tumor spheroids with good penetration capability.More importantly,it could synergize with TRAIL treatment to induce the robust generation of reactive oxygen species(ROS),downregulating ER stress related selenoproteins for triggering tumor cells apoptosis in extrinsic and intrinsic signaling pathways.Taken together,this study provides a potential chemo-drug and sensitizer agent to improve the therapeutic efficacy of TRAIL-based cancer treatment.
文摘We investigated the effect of processing conditions on the structure and physical properties of the polycrystalline samples of Ca0.8Fe2Se2 prepared via solid state reaction. X-ray diffraction showed that the main phase became FeSe when the sintering temperature increased above 350 ℃. The temperature dependence of magnetization （M-T curves） recorded in zero-field-cooled mode by SQUID magnetometer showed some bumps at around 120 K to 140 K. These bumps moved to lower temperatures when the processing temperature increased above 550 ℃. On the other hand, pure FeSe materials produced at 900 ℃ for 24 h showed a sharp superconducting transition Tconset = 8.16 K and the critical current density of 6,252 A/cm2 at 5 K, self-field. SEM results indicated an enhanced grain connectivity.
基金the Natural Science Foundation of Shandong Province(No.ZR2020MB019)Introduction and Cultivation Project for Young Innovative Talents in Shandong Provincial Colleges and Universities for financial support.
文摘In this study,we present a convenient method to obtain two types of novel tetra-substituted Fe/Se salts through a dehalogenation reaction,aiming to advance research on mimicking the FeⅡFeⅡ oxidation state of[FeFe]-H_(2) ases.Initially,by treating[Fe_(2)(μ-SeBn)_(2)(CO)_(4)(dppv)](Bn=CH_(2)C_(6)H_(5),dppv=cis-1,2-bis(diphenylphosphino)ethylene)with one equivalent of dppv under UV and reflux conditions,the neutral FeIFeI and FeⅡFeⅡ precursors[Fe_(2)(μ-SeBn)_(2)(CO)_(2)(dppv)_(2)](1)and[Fe_(2)(μ-SeBn)_(2)(μ-Se)(CO)_(2)(dppv)_(2)](2)were successfully isolated in good yields.Subsequently,1 underwent dehalogenation reactions with halocarbons(such as CCl_(4) and CBr4)or I_(2),leading to the formation of tetra-substituted salts[Fe_(2)(μ-SeBn)_(2)(μ-X)(CO)_(2)(dppv)_(2)]+(X=Cl,Br,and I)([3]Cl,[4]Br and[5]I_(3)).GC-MS analysis of the reaction with carbon tetrachloride detected the formation of the homo-coupled product CCl_(3)-CCl_(3)(m/z=235),indicating the presence of a CCl_(3)·species.Notably,2 also exhibited intriguing reactivity with R-X and I_(2).Unlike 1,the reaction of 2 with RX or I_(2) involved cleavage of the C-Se bond,leading to the isolation of[Fe_(2)(μ-SeBn)(μ-Se_(2))(CO)_(2)(dppv)_(2)]+X-(X=Cl,Br,I_(3))([6]Cl,[6]Br and[6]I_(3))in good yields.The reaction involved debenzylation of 2 and was confirmed by GC-MS detection of C6H5CH_(2)CCl_(3)(m/z=208)in the reaction with CCl_(4),suggesting a radical pathway.
基金supported by the National Key R&D Program of China(Grant Nos.2022YFA1403900,2022YFA14030002022YFA1603900)+3 种基金the National Natural Science Foundation of China(Grant Nos.12374141,12225412,52588301,and 12504169)the Chinese Academy of Sciences(CAS)President’s International Fellowship Initiative(Grant Nos.2024DM0018 and 2025PG0007)CAS Project for Young Scientists in Basic Research(Grant No.2022YSBR-048)the Open Research Fund of the Pulsed High Magnetic Field Facility,Huazhong University of Science and Technology(Grant No.WHMFC2024001)。
文摘FeSe films have attracted extensive research interest in iron-based superconductors owing to their highly tunable superconducting properties.Here,we fabricated a series of Fe Se films with various thicknesses on Li F substrates using pulsed-laser deposition.
基金supported by the National Natural Science Foundation of China(grant no.21771021,21822501,and 22061130206)the Beijing Municipal Natural Science Foundation(JQ20003)+4 种基金the Newton Advanced Fellowship award(NAF\R1\201285)the Fok Ying-Tong Education Foundation(grant no.171008)the Beijing Nova Program(grant no.xx2018115)the Measurements Fund of Beijing Normal Universitythe Fundamental Research Funds for the Central Universities.
文摘During the last few years,the electrocatalytic nitrogen reduction reaction(NRR)has provided an environmentally friendly and promising alternative to the Haber–Bosch process.However,due to the competing hydrogen evolution reaction and the hard-to-break strong NuN bond with high bond energy(941 kJ mol^(-1)),the synthesis of efficient NRR catalysts is still a challenge.Herein,we report a cost-effective layered double hydroxide(LDH)derived bimetallic NiFe selenide(Ni_(0.75)Fe_(0.25)Se_(2))in Li_(2)SO_(4)solution for NRR under ambient conditions,which exhibits an NH_(3)yield rate of 5.64μg h^(-1)cm^(-2)_(cat)and faradaic efficiency of 12.3%at−0.1 V vs.RHE,being superior to those of pristine NiFe–LDH,NiSe_(2),and FeSe_(2)as well as several state-of-the-art noble metal catalysts.The high electrocatalytic NRR activity and selectivity of Ni_(0.75)Fe_(0.25)Se_(2)demonstrate the first example of NiFe selenide catalyst with a facile synthesis strategy towards efficient nitrogen fixation.
