Introduction of active centers,such as oxygen vacancy and metal single atoms,has emerged as a promising strategy to further improve the electrochemical properties of transition metal oxide electrodes for high-performa...Introduction of active centers,such as oxygen vacancy and metal single atoms,has emerged as a promising strategy to further improve the electrochemical properties of transition metal oxide electrodes for high-performance pseudocapacitors.Here,an unprecedented MoO_(3)with multiple active centers,Ni anchored reduced MoO_(3)with oxygen vacancy(NirMoO_(3-x)),was in situ synthesized via γ-ray radiationinduced one-pot strategy under ambient conditions.This approach leverages the synergistic effects of radiation activation,etching,and reduction.The characteristics of multiple valence states(Mo^(4+/5+/6+)and Ni^(0/2+)),oxygen vacancies,single atoms,and atomic clusters in NirMoO_(3-x) were determined by X-ray photoelectron spectroscopy(XPS),X-ray absorption fine structure spectroscopy(XAFS),and atomic-resolution aberrationcorrected high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)measurements.Notably,Ni-rMoO_(3-x)exhibited exceptional pseudocapacitive performance,with ultrahigh specific charge(881.0 C·g^(-1)at 1 A·g^(-1),more than twice that of MoO_(3)),fast charge/discharge rates,and remarkable cycle life stability(98.5% capacitance retention after 10,000 cycles).Furthermore,a hybrid supercapacitor device(Ni-rMoO_(3-x)//activated carbon(AC))demonstrated a high energy density of 97.8 Wh·kg^(-1)at a power density of 0.90 kW·kg^(-1)and exhibited excellent mechanical flexibility for practical applications.展开更多
A Mach-Zehnder interferometer(MZI)for high temperature(1000°C)sensing based on few mode fiber(FMF)was proposed and experimentally demonstrated.The sensor was fabricated by fusing a section of FMF between two sing...A Mach-Zehnder interferometer(MZI)for high temperature(1000°C)sensing based on few mode fiber(FMF)was proposed and experimentally demonstrated.The sensor was fabricated by fusing a section of FMF between two single-mode fibers(SMFs).The structure was proven to be an excellent high temperature sensor with good stability,repeatability,and high temperature sensitivity(48.2 pm/C)after annealing process at a high temperature lasting some hours,and a wide working temperature range(from room temperature to 1000 C).In addition,the simple fabrication process and the low cost offered a great potential for sensing in high temperature environments.展开更多
基金supported by the National Natural Science Foundation of China(Nos.22176194,22206016,and 12305397)the Natural Science Foundation of Jiangsu Province(No.BK20230511)+2 种基金Science Challenge Project(No.TZ2018004)Suzhou Fundamental Research Project(No.SJC2023001)Key Scientific Research Foundation of the Education Department of Province Anhui(No.2022AH051835).
文摘Introduction of active centers,such as oxygen vacancy and metal single atoms,has emerged as a promising strategy to further improve the electrochemical properties of transition metal oxide electrodes for high-performance pseudocapacitors.Here,an unprecedented MoO_(3)with multiple active centers,Ni anchored reduced MoO_(3)with oxygen vacancy(NirMoO_(3-x)),was in situ synthesized via γ-ray radiationinduced one-pot strategy under ambient conditions.This approach leverages the synergistic effects of radiation activation,etching,and reduction.The characteristics of multiple valence states(Mo^(4+/5+/6+)and Ni^(0/2+)),oxygen vacancies,single atoms,and atomic clusters in NirMoO_(3-x) were determined by X-ray photoelectron spectroscopy(XPS),X-ray absorption fine structure spectroscopy(XAFS),and atomic-resolution aberrationcorrected high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)measurements.Notably,Ni-rMoO_(3-x)exhibited exceptional pseudocapacitive performance,with ultrahigh specific charge(881.0 C·g^(-1)at 1 A·g^(-1),more than twice that of MoO_(3)),fast charge/discharge rates,and remarkable cycle life stability(98.5% capacitance retention after 10,000 cycles).Furthermore,a hybrid supercapacitor device(Ni-rMoO_(3-x)//activated carbon(AC))demonstrated a high energy density of 97.8 Wh·kg^(-1)at a power density of 0.90 kW·kg^(-1)and exhibited excellent mechanical flexibility for practical applications.
基金This work was funded by the National Natural Science Foundation of China(NSFC)(Grant Nos.41266001,61665007,and 61865013)National Key Research and Development Project from the Ministry of Science and Technology(Grant No.2018YFE0115700)+1 种基金Science and Technology Project of Jiangxi Education Department(Grant No.GJJ180518)Nanchang Hangkong University graduate student innovation special fund project(Grant No.YC2019053).
文摘A Mach-Zehnder interferometer(MZI)for high temperature(1000°C)sensing based on few mode fiber(FMF)was proposed and experimentally demonstrated.The sensor was fabricated by fusing a section of FMF between two single-mode fibers(SMFs).The structure was proven to be an excellent high temperature sensor with good stability,repeatability,and high temperature sensitivity(48.2 pm/C)after annealing process at a high temperature lasting some hours,and a wide working temperature range(from room temperature to 1000 C).In addition,the simple fabrication process and the low cost offered a great potential for sensing in high temperature environments.
