The nano-MnO2 as active electrode material for supercapacitor was synt hesized by solid-state reaction between KMnO4 and manganese acetate at room temp erature. The products annealed at 100 ℃ and 200 ℃ were characte...The nano-MnO2 as active electrode material for supercapacitor was synt hesized by solid-state reaction between KMnO4 and manganese acetate at room temp erature. The products annealed at 100 ℃ and 200 ℃ were characterized by XRD an d TEM. The results showed the sample annealed at 100 ℃ was poorly crystallized phase with an average grain size of <20 nm. Electrochemical performances of mang anese oxide electrode were investigated by cyclic voltammetry and constant curre nt charge/discharge. The manganese oxide electrode annealed at 100 ℃ in 1 mol· L-1 Na2SO4 aqueous electrolyte exhibited excellent capacitive behavior between - 0.2 and +0.8 V (vs SCE). By 5 mA and 10 mA constant current charge/discharge, th e nano-MnO2 annealed at 100 ℃ can provide a specific capacitance of 158.5 F·g- 1 and 151.2 F·g-1, respectively.展开更多
Among the large energy storage batteries,the sodium ion batteries(SIBs)are attracted huge interest due to the fact of its abundant raw materials and low cost,and has become the most promising secondary battery.Tunnel-...Among the large energy storage batteries,the sodium ion batteries(SIBs)are attracted huge interest due to the fact of its abundant raw materials and low cost,and has become the most promising secondary battery.Tunnel-type sodium manganese oxides(TMOs)are industrialized cathode materials because of their simple synthesis method and proficient electrochemical performance.Na_(0.44)MnO_(2)(NMO)is considered the best candidate material for all tunnel-type structural materials.In this paper,the research progress in charge and discharge of cathode materials for tunnel-type structural SIBs is reviewed,the redox mechanism and all sorts of synthesis methods and different coating methods lead to different morphology and electrochemical properties of materials and the classification of electrolytes and nonaqueous electrolytes.The development and utility of aqueous solutions are discussed,and the mechanism is analyzed.Summarized the cationic potential of the transition metal oxide for tunnel structure,plays a vital role in predicting and designing the cathode material of this structure.In addition,the future opportunities and challenges for such tunnel-type SIBs in this field are described in detail.展开更多
Aqueous rechargeable batteries are a possible strategy for large-scale energy storage systems.However,limited choices of anode materials restrict their further application.Here we report phenazine(PNZ)as stable anode ...Aqueous rechargeable batteries are a possible strategy for large-scale energy storage systems.However,limited choices of anode materials restrict their further application.Here we report phenazine(PNZ)as stable anode materials in different alkali-ion(Li+,Na+,K+)electrolyte.A novel full cell is assembled by phenazine anode,Na0.44MnO2 cathode and 10 M NaOH electrolyte to further explore the electrochemical performance of phenazine anode.This battery is able to achieve high capacity(176.7 mAh·g^−1 at 4 C(1.2·Ag^−1)),ultralong cycling life(capacity retention of 80%after 13,000 cycles at 4 C),and excellent rate capacity(92 mAh·g^−1 at 100 C(30 A·g^−1)).The reaction mechanism of PNZ during charge—discharge process is demonstrated by in situ Raman spectroscopy,in situ Fourier transform infrared(FTIR)spectroscopy,X-ray photoelectron spectroscopy(XPS)and density functional theory(DFT)calculations.Furthermore,the system is able to successfully operate at wide temperature range from−20 to 70°C and achieves remarkable electrochemical performance.展开更多
文摘The nano-MnO2 as active electrode material for supercapacitor was synt hesized by solid-state reaction between KMnO4 and manganese acetate at room temp erature. The products annealed at 100 ℃ and 200 ℃ were characterized by XRD an d TEM. The results showed the sample annealed at 100 ℃ was poorly crystallized phase with an average grain size of <20 nm. Electrochemical performances of mang anese oxide electrode were investigated by cyclic voltammetry and constant curre nt charge/discharge. The manganese oxide electrode annealed at 100 ℃ in 1 mol· L-1 Na2SO4 aqueous electrolyte exhibited excellent capacitive behavior between - 0.2 and +0.8 V (vs SCE). By 5 mA and 10 mA constant current charge/discharge, th e nano-MnO2 annealed at 100 ℃ can provide a specific capacitance of 158.5 F·g- 1 and 151.2 F·g-1, respectively.
基金supported by the National Natural Science Foundation of China (NSFC, Nos. 51804035, 51874079 and 51674068the Hebei Province Key Research and Development Plan Project (No.19211302D)+2 种基金the support from Natural Science Foundation of Hebei Province (No. E2018501091)The Fundamental Research Funds for the Central Universities (Nos. N172302001, N182306001, N182312007, N2023040)the support from Research Project on the Distribution of Heavy Metals in Soil and Comprehensive Utilization Technology of Tailings in Typical Iron Tailing Reservoir Areas of Hebei Province (No. 802060671901)
文摘Among the large energy storage batteries,the sodium ion batteries(SIBs)are attracted huge interest due to the fact of its abundant raw materials and low cost,and has become the most promising secondary battery.Tunnel-type sodium manganese oxides(TMOs)are industrialized cathode materials because of their simple synthesis method and proficient electrochemical performance.Na_(0.44)MnO_(2)(NMO)is considered the best candidate material for all tunnel-type structural materials.In this paper,the research progress in charge and discharge of cathode materials for tunnel-type structural SIBs is reviewed,the redox mechanism and all sorts of synthesis methods and different coating methods lead to different morphology and electrochemical properties of materials and the classification of electrolytes and nonaqueous electrolytes.The development and utility of aqueous solutions are discussed,and the mechanism is analyzed.Summarized the cationic potential of the transition metal oxide for tunnel structure,plays a vital role in predicting and designing the cathode material of this structure.In addition,the future opportunities and challenges for such tunnel-type SIBs in this field are described in detail.
基金This study was supported by the National Key R&D Program of China(Nos.2016YFB0901500 and 2016YFB0101201)the National Natural Science Foundation of China(No.51771094)+1 种基金Ministry of Education of China(Nos.B12015 and IRT13R30)Tianjin High-Tech(No.18JCZDJC31500).
文摘Aqueous rechargeable batteries are a possible strategy for large-scale energy storage systems.However,limited choices of anode materials restrict their further application.Here we report phenazine(PNZ)as stable anode materials in different alkali-ion(Li+,Na+,K+)electrolyte.A novel full cell is assembled by phenazine anode,Na0.44MnO2 cathode and 10 M NaOH electrolyte to further explore the electrochemical performance of phenazine anode.This battery is able to achieve high capacity(176.7 mAh·g^−1 at 4 C(1.2·Ag^−1)),ultralong cycling life(capacity retention of 80%after 13,000 cycles at 4 C),and excellent rate capacity(92 mAh·g^−1 at 100 C(30 A·g^−1)).The reaction mechanism of PNZ during charge—discharge process is demonstrated by in situ Raman spectroscopy,in situ Fourier transform infrared(FTIR)spectroscopy,X-ray photoelectron spectroscopy(XPS)and density functional theory(DFT)calculations.Furthermore,the system is able to successfully operate at wide temperature range from−20 to 70°C and achieves remarkable electrochemical performance.
