Micro-sized anatase TiO_(2) displays inferior capacity as cathode material for magnesium ion batteries because of the higher diffusion energy barrier of Mg^(2+)in anatase TiO_(2) lattice.Herein,we report that nanosize...Micro-sized anatase TiO_(2) displays inferior capacity as cathode material for magnesium ion batteries because of the higher diffusion energy barrier of Mg^(2+)in anatase TiO_(2) lattice.Herein,we report that nanosized anatase TiO_(2) exposed(001)facet doubles the capacity compared to the micro-sized sample ascribed to the interfacial Mg^(2+)ion storage.First-principles calculations reveal that the diffusion energy barrier of Mg^(2+)on the(001)facet is significantly lower than those in the bulk phase and on(100)facet,and the adsorption energy of Mg^(2+)on the(001)facet is also considerably lower than that on(100)facet,which guarantees superior interfacial Mg^(2+)storage of(001)facet.Moreover,anatase TiO_(2) exposed(001)facet displays a significantly higher capacity of 312.9 mAh g^(−1) in Mg-Li dual-salt electrolyte compared to 234.3 mAh g^(−1) in Li salt electrolyte.The adsorption energies of Mg^(2+)on(001)facet are much lower than the adsorption energies of Li+on(001)facet,implying that the Mg^(2+)ion interfacial storage is more favorable.These results highlight that controlling the crystal facet of the nanocrystals effectively enhances the interfacial storage of multivalent ions.This work offers valuable guidance for the rational design of high-capacity storage systems.展开更多
Photoelectrochemical (PEC) hydrogen production holds great promise for applications in energy production. A novel strategy characterized by simplicity, stability, and high efficiency is developed to significantly boos...Photoelectrochemical (PEC) hydrogen production holds great promise for applications in energy production. A novel strategy characterized by simplicity, stability, and high efficiency is developed to significantly boost the PEC performance of TiO_(2) (anatase) nanotube arrays (TNTAs). This strategy entails a series of treatments, including a conventional anodic oxidation (etching) process, a primary annealing treatment, and a secondary annealing treatment via impregnation. As a result, nickel phosphide (Ni_(2)P) is composited onto well-ordered titanium dioxide (anatase) nanotube array photoanodes (Ni_(2)P/TNTAs), which exhibit hugely improved PEC H_(2) generation performance. A thorough and systematic investigation is conducted to comprehensively analyze the morphology, semiconductor band-gap structure, and PEC H_(2) production performance of the Ni_(2)P/TNTAs composites. The experimental results demonstrate that under identical experimental circumstances, the measured photocurrent density of the Ni_(2)P/TNTAs photoanode exhibits a 6.63-fold increase relative to that of TNTAs. The H_(2) production rate of Ni_(2)P/TNTAs reaches 182.96 μmol/cm^(2), 6.10 times higher than that of pure TNTAs. The excellent interfacial charge transfer pathway at the Ni_(2)P/TiO_(2) interface promotes photogenerated carrier separation and electron transfer from TiO_(2) to Ni_(2)P. This method offers a valuable reference for designing highly efficient PEC H_(2)-production catalysts.展开更多
In this work,the TiO_(2)/Sb_(2)S_(3) nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC...In this work,the TiO_(2)/Sb_(2)S_(3) nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC activity of TiO_(2)/Sb_(2)S_(3) composite sample was investigated by electrochemical impedance analysis,including Nyquist and Mott-Schottky(M-S)plots.It was demonstrated that vacuum annealing could crystallize Sb_(2)S_(3) component and change its color from red to black,leading to an increment of photocurrent density from 1.9 A/m^(2) to 4.25 A/m^(2) at 0 V versus saturated calomel electrode(VSCE).The enhanced PEC performance was mainly attributed to the improved visible light absorption.Moreover,annealing treatment facilitated retarding the electron-hole recombination occurred at the solid/liquid interfaces.Our work might provide a novel strategy for enhancing the PEC performance of a semiconductor electrode.展开更多
基金supported by the National Key R&D Program of China(No.2023YFB3809500)the Fundamental Research Funds for the Central Universities(No.2024CDJXY003)+1 种基金the Venture&Innovation Support Program for Chongqing Overseas Returnees(cx2023087)The Chongqing Technology Innovation and Application Development Project(No.2024TIAD-KPX0003).
文摘Micro-sized anatase TiO_(2) displays inferior capacity as cathode material for magnesium ion batteries because of the higher diffusion energy barrier of Mg^(2+)in anatase TiO_(2) lattice.Herein,we report that nanosized anatase TiO_(2) exposed(001)facet doubles the capacity compared to the micro-sized sample ascribed to the interfacial Mg^(2+)ion storage.First-principles calculations reveal that the diffusion energy barrier of Mg^(2+)on the(001)facet is significantly lower than those in the bulk phase and on(100)facet,and the adsorption energy of Mg^(2+)on the(001)facet is also considerably lower than that on(100)facet,which guarantees superior interfacial Mg^(2+)storage of(001)facet.Moreover,anatase TiO_(2) exposed(001)facet displays a significantly higher capacity of 312.9 mAh g^(−1) in Mg-Li dual-salt electrolyte compared to 234.3 mAh g^(−1) in Li salt electrolyte.The adsorption energies of Mg^(2+)on(001)facet are much lower than the adsorption energies of Li+on(001)facet,implying that the Mg^(2+)ion interfacial storage is more favorable.These results highlight that controlling the crystal facet of the nanocrystals effectively enhances the interfacial storage of multivalent ions.This work offers valuable guidance for the rational design of high-capacity storage systems.
基金financial support of the Natural Science Foundation of Fujian Province(2023H0046)the XMIREM autonomously deployment project(2023CX10,2023GG01)+3 种基金the Science and Technology Service Network Initiative from Chinese Academy of Science(STS2024T3071)the National Natural Science Foundation of China(22275185,22272069,22472074)the Major Research Project of Xiamen(3502Z20191015)the Fujian Science&Technology Innovation Laboratory for Optoelectronic Information。
文摘Photoelectrochemical (PEC) hydrogen production holds great promise for applications in energy production. A novel strategy characterized by simplicity, stability, and high efficiency is developed to significantly boost the PEC performance of TiO_(2) (anatase) nanotube arrays (TNTAs). This strategy entails a series of treatments, including a conventional anodic oxidation (etching) process, a primary annealing treatment, and a secondary annealing treatment via impregnation. As a result, nickel phosphide (Ni_(2)P) is composited onto well-ordered titanium dioxide (anatase) nanotube array photoanodes (Ni_(2)P/TNTAs), which exhibit hugely improved PEC H_(2) generation performance. A thorough and systematic investigation is conducted to comprehensively analyze the morphology, semiconductor band-gap structure, and PEC H_(2) production performance of the Ni_(2)P/TNTAs composites. The experimental results demonstrate that under identical experimental circumstances, the measured photocurrent density of the Ni_(2)P/TNTAs photoanode exhibits a 6.63-fold increase relative to that of TNTAs. The H_(2) production rate of Ni_(2)P/TNTAs reaches 182.96 μmol/cm^(2), 6.10 times higher than that of pure TNTAs. The excellent interfacial charge transfer pathway at the Ni_(2)P/TiO_(2) interface promotes photogenerated carrier separation and electron transfer from TiO_(2) to Ni_(2)P. This method offers a valuable reference for designing highly efficient PEC H_(2)-production catalysts.
基金supported by the Fundamental Research Funds for the Central Universities(No.2019ZDPY04).
文摘In this work,the TiO_(2)/Sb_(2)S_(3) nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC activity of TiO_(2)/Sb_(2)S_(3) composite sample was investigated by electrochemical impedance analysis,including Nyquist and Mott-Schottky(M-S)plots.It was demonstrated that vacuum annealing could crystallize Sb_(2)S_(3) component and change its color from red to black,leading to an increment of photocurrent density from 1.9 A/m^(2) to 4.25 A/m^(2) at 0 V versus saturated calomel electrode(VSCE).The enhanced PEC performance was mainly attributed to the improved visible light absorption.Moreover,annealing treatment facilitated retarding the electron-hole recombination occurred at the solid/liquid interfaces.Our work might provide a novel strategy for enhancing the PEC performance of a semiconductor electrode.
