Layered ammonium vanadate has become a promising cathode material for aqueous zinc ion batteries(ZIBs)due to its small mass and large ionic radius of ammonium ions as well as the consequent large layer spacing and hig...Layered ammonium vanadate has become a promising cathode material for aqueous zinc ion batteries(ZIBs)due to its small mass and large ionic radius of ammonium ions as well as the consequent large layer spacing and high specific capacity.However,the irreversible de-ammoniation caused by N·H···O bonds damaged would impair cycle life of ZIBs and the strong electrostatic interaction between Zn^(2+)and V-O frame could slower the mobility of Zn^(2+).Furthermore,the thermal instability of ammonium vanadate also limits the use of common carbon coating modification method to solve the problem.Herein,V_(2)CT_(X)MXene was innovatively selected as a bifunctional source to in-situ derivatized(NH_(4))_(2)V_(8)O_(20)·x H_(2)O with amorphous carbon-coated(NHVO@C)via one-step hydrothermal method in relatively moderate temperature.The amorphous carbon shell derived from the V_(2)CT_(X)MXene as a conductive framework to effectively improve the diffusion kinetics of Zn^(2+)and the robust carbon skeleton could alleviate the ammonium dissolution during long-term cycling.As a result,zinc ion batteries using NHVO@C as cathode exhibit superior electrochemical performance.Moreover,the assembled foldable or high loading(10.2 mg/cm^(2))soft-packed ZIBs further demonstrates its practical application.This study provided new insights into the development of the carbon cladding process for thermally unstable materials in moderate temperatures.展开更多
The development of advanced and efficient microwave-absorbing materials through the precise regulation of dielectric loss and impedance matching remains a significant challenge.In this study,(Hf_(0.25)Zr_(0.25)Ta_(0.2...The development of advanced and efficient microwave-absorbing materials through the precise regulation of dielectric loss and impedance matching remains a significant challenge.In this study,(Hf_(0.25)Zr_(0.25)Ta_(0.25)Nb_(0.25))C–SiC(HEC–SiC)biphasic ceramic powders were synthesized via a single-source-precursor route.The SiC content was systematically controlled by adjusting the amount of methyltrimethoxysilane.The resulting polymer-derived HEC–SiC composite exhibited a unique microstructure,with nanosized SiC particles uniformly distributed throughout the HEC matrix.As a result,the HEC–SiC-2 composite,containing approximately 21.21 wt%SiC,achieved a minimum reflection loss value(RL_(min))of−54.28 dB at 12.39 GHz with a thickness of 3.14 mm.The superior microwave attenuation capability is attributed to optimized impedance matching,enhanced interfacial polarization between the HEC matrix and nanosized SiC,and dipole polarization induced by defects within HEC.This study offers a novel strategy for the fabrication of high-entropy ceramic–SiC biphasic composites with excellent microwave absorbing properties,paving the way for their application in electromagnetic interference shielding and stealth technologies.展开更多
Colorectal cancer(CRC)is the second leading cause of cancer-related deaths worldwide1.Surgical radical resection with adjuvant chemotherapy remains the primary treatment choice for CRC,but the 5-year postoperative sur...Colorectal cancer(CRC)is the second leading cause of cancer-related deaths worldwide1.Surgical radical resection with adjuvant chemotherapy remains the primary treatment choice for CRC,but the 5-year postoperative survival rate is only approximately 60%,and approximately one-third of patients with CRC experience recurrence within 2 years of surgery2.Fortunately,the transformation of high-throughput sequencing has accelerated the development of precision medicine.For example,KRAS mutations indicate resistance to anti-epidermal growth factor receptor(EGFR)-targeted therapies in CRC3.Furthermore,molecular-guided individualized therapy has brought new promise in major clinical areas and challenges,such as novel biomarkers predicting sensitivity and resistance to immunotherapy for microsatellite stable(MSS)CRC.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.52402271,22005167 and52302273)the Youth Innovation Team Project for Talent Introduction and Cultivation in Universities of Shandong Province(No.2024KJH129)+2 种基金the Taishan Scholar Project of Shandong Provinceof China(Nos.tsqn202211160,tsqn202312199)Shandong Provincial Natural Science Foundation of China(Nos.ZR2022QE003 and ZR2023QE176)China Postdoctoral Science Foundation(No.2023M741810)。
文摘Layered ammonium vanadate has become a promising cathode material for aqueous zinc ion batteries(ZIBs)due to its small mass and large ionic radius of ammonium ions as well as the consequent large layer spacing and high specific capacity.However,the irreversible de-ammoniation caused by N·H···O bonds damaged would impair cycle life of ZIBs and the strong electrostatic interaction between Zn^(2+)and V-O frame could slower the mobility of Zn^(2+).Furthermore,the thermal instability of ammonium vanadate also limits the use of common carbon coating modification method to solve the problem.Herein,V_(2)CT_(X)MXene was innovatively selected as a bifunctional source to in-situ derivatized(NH_(4))_(2)V_(8)O_(20)·x H_(2)O with amorphous carbon-coated(NHVO@C)via one-step hydrothermal method in relatively moderate temperature.The amorphous carbon shell derived from the V_(2)CT_(X)MXene as a conductive framework to effectively improve the diffusion kinetics of Zn^(2+)and the robust carbon skeleton could alleviate the ammonium dissolution during long-term cycling.As a result,zinc ion batteries using NHVO@C as cathode exhibit superior electrochemical performance.Moreover,the assembled foldable or high loading(10.2 mg/cm^(2))soft-packed ZIBs further demonstrates its practical application.This study provided new insights into the development of the carbon cladding process for thermally unstable materials in moderate temperatures.
基金supported by the Basic and Application Basic Research of Guangzhou Science and Technology Plan Project(No.2023A04J1006)the National Natural Science Foundation of China(No.52272058)the Key Discipline of Materials Science and Engineering,Bureau of Education of Guangzhou(No.202255464).
文摘The development of advanced and efficient microwave-absorbing materials through the precise regulation of dielectric loss and impedance matching remains a significant challenge.In this study,(Hf_(0.25)Zr_(0.25)Ta_(0.25)Nb_(0.25))C–SiC(HEC–SiC)biphasic ceramic powders were synthesized via a single-source-precursor route.The SiC content was systematically controlled by adjusting the amount of methyltrimethoxysilane.The resulting polymer-derived HEC–SiC composite exhibited a unique microstructure,with nanosized SiC particles uniformly distributed throughout the HEC matrix.As a result,the HEC–SiC-2 composite,containing approximately 21.21 wt%SiC,achieved a minimum reflection loss value(RL_(min))of−54.28 dB at 12.39 GHz with a thickness of 3.14 mm.The superior microwave attenuation capability is attributed to optimized impedance matching,enhanced interfacial polarization between the HEC matrix and nanosized SiC,and dipole polarization induced by defects within HEC.This study offers a novel strategy for the fabrication of high-entropy ceramic–SiC biphasic composites with excellent microwave absorbing properties,paving the way for their application in electromagnetic interference shielding and stealth technologies.
基金the Ministry of Science and Technology of China(Grant No.2018YFE0201604)the National Natural Science Foundation of China(Grant No.81872137 and 82072917)the Science and Technology Commission of Shanghai Municipality(Grant No.20DZ1100100)。
文摘Colorectal cancer(CRC)is the second leading cause of cancer-related deaths worldwide1.Surgical radical resection with adjuvant chemotherapy remains the primary treatment choice for CRC,but the 5-year postoperative survival rate is only approximately 60%,and approximately one-third of patients with CRC experience recurrence within 2 years of surgery2.Fortunately,the transformation of high-throughput sequencing has accelerated the development of precision medicine.For example,KRAS mutations indicate resistance to anti-epidermal growth factor receptor(EGFR)-targeted therapies in CRC3.Furthermore,molecular-guided individualized therapy has brought new promise in major clinical areas and challenges,such as novel biomarkers predicting sensitivity and resistance to immunotherapy for microsatellite stable(MSS)CRC.
