Developing suitable anode materials for potassium-ion batteries(PIBs)remains a great challenge owing to the limited theoretical capacity of active materials and large radius of K+ion(1.38?).To solve these obstacles,by...Developing suitable anode materials for potassium-ion batteries(PIBs)remains a great challenge owing to the limited theoretical capacity of active materials and large radius of K+ion(1.38?).To solve these obstacles,by integrating the principles of multielectron transfer and rational porous crystal framework,we creatively propose the monoclinic Cu_(3)(OH)_(2)V_(2)O_(7)·2H_(2)O(CVO)as a novel anode for PIBs.Furthermore,inspired by the metastable nature of CVO under high temperature/pressure,we skillfully design a facile hydrothermal recrystallization strategy without the phase change and surfactants addition.Thus,for the first time,the porous composite of Cu_(3)(OH)_(2)V_(2)O_(7)·2H_(2)O nanobelts covered in situ by reduced graphene oxide(CVO NBs/r GO)was assembled,greatly improving the deficiencies of CVO.When used as a novel anode for PIBs,CVO NBs/r GO delivers large specific capacity(up to 551.4 m Ah g^(-1)at 50 m A g^(-1)),high-rate capability(215.3 m Ah g^(-1)at 2.5 A g^(-1))and super durability(203.6 m Ah g^(-1)at 500 m A g^(-1)even after 1000 cycles).The outstanding performance can be ascribed to the synergistic merits of desirable structural features of monoclinic CVO nanobelts and the highly conductive graphene 3D network,thus promoting the composite material stability and electrical/ionic conductivity.This work reveals a novel metal vanadate-based anode material for PIBs,would further motivate the subsequent batteries research on M_(3)(OH)_(2)V_(2)O_(7)-n H_(2)O(M;Co,Ni,Cu,Zn),and ultimately expands valuable fundamental understanding on designing other high-performance electrode materials,including the combined strategies of multielectron transfer with rational porous crystal framework,and the composite fabrication of 1D electrode nanostructure with conductive carbon matrix.展开更多
Molybdenum trioxide(MoO_(3))can be employed as an excellent host for intercalation due to its 2D lay-ered structure that connected by van der Waals interactions.Herein,a series of polyoxometalate-based MoO_(3) composi...Molybdenum trioxide(MoO_(3))can be employed as an excellent host for intercalation due to its 2D lay-ered structure that connected by van der Waals interactions.Herein,a series of polyoxometalate-based MoO_(3) composites(Al_(13)@MoO_(3))were successfully prepared by interpolating the Keggin-type polycationic AlO_(4)Al_(12)(OH)_(24)H_(2)O_(12)^(7+)(Al_(13))into MoO_(3)gallery.These composites can be applied to rapidly adsorb the anionic dye methyl orange(MO)through strong electrostatic interactions lead to compact and sta-ble gathering in the surrounding of the numerous charged Al_(13).Adsorption behaviors of composites with the different amount of Al_(13) were determined,these results revealed that Al_(13)-3.34%@MoO_(3)exhibited the most remarkable adsorption capacity.More importantly,the composite maintains superior adsorption capacity for five consecutive adsorption/desorption cycles,suggesting that Al_(13)@MoO_(3)can be an efficient and durable adsorbent.展开更多
The heterojunction effect can effectively improve the separation efficiency of the photocatalyst’s photo-generated electron and hole pairs,thereby greatly improving the photocatalytic hydrogen production performance ...The heterojunction effect can effectively improve the separation efficiency of the photocatalyst’s photo-generated electron and hole pairs,thereby greatly improving the photocatalytic hydrogen production performance of the photocatalyst.In this paper,Bi_(6)O_(6)(OH)_(3)(NO_(3))_(3)·1.5H_(2)O(BBN)and ZnO are used to construct and synthesize Bi_(6)O_(6)(OH)_(3)(NO_(3))_(3)·1.5H_(2)O/ZnO(BBN/ZnO)heterojunction photocatalyst.Under UV-vis light irradiation,the BBN/ZnO composite could generate H_(2)with a rate of 28.66μmol·g^(−1)·h^(−1),which is higher than pure BBN(0.92μmol·g^(−1)·h^(−1))and ZnO(6.54μmol·h^(−1)·g^(−1))at around 31.1 and 4.4 times,respectively.Moreover,the experimental results found that the composite still exhibits excellent photocatalytic activity and maintains a high and stable activity in the 12-hour experiment with 3 cycles.The possible mechanism to enhance the photocatalytic behavior is attributed to the expanded light absorption range,reduced surface migration resistance,and inhibited recombination of photo-generated electron and hole pairs.展开更多
基金supported by the National Natural Science Foundation of China(52072118,51772089)the Youth 1000 Talent Program of China+3 种基金the Research and Development Plan of Key Areas in Hunan Province(2019GK2235)the Key Research and Development Program of Ningxia(2020BDE03007)the China Postdoctoral Science Foundation(2019M653649)the Guangdong Basic and Applied Basic Research Fund(2019A1515110518,2019A1515111188,2020B0909030004)。
文摘Developing suitable anode materials for potassium-ion batteries(PIBs)remains a great challenge owing to the limited theoretical capacity of active materials and large radius of K+ion(1.38?).To solve these obstacles,by integrating the principles of multielectron transfer and rational porous crystal framework,we creatively propose the monoclinic Cu_(3)(OH)_(2)V_(2)O_(7)·2H_(2)O(CVO)as a novel anode for PIBs.Furthermore,inspired by the metastable nature of CVO under high temperature/pressure,we skillfully design a facile hydrothermal recrystallization strategy without the phase change and surfactants addition.Thus,for the first time,the porous composite of Cu_(3)(OH)_(2)V_(2)O_(7)·2H_(2)O nanobelts covered in situ by reduced graphene oxide(CVO NBs/r GO)was assembled,greatly improving the deficiencies of CVO.When used as a novel anode for PIBs,CVO NBs/r GO delivers large specific capacity(up to 551.4 m Ah g^(-1)at 50 m A g^(-1)),high-rate capability(215.3 m Ah g^(-1)at 2.5 A g^(-1))and super durability(203.6 m Ah g^(-1)at 500 m A g^(-1)even after 1000 cycles).The outstanding performance can be ascribed to the synergistic merits of desirable structural features of monoclinic CVO nanobelts and the highly conductive graphene 3D network,thus promoting the composite material stability and electrical/ionic conductivity.This work reveals a novel metal vanadate-based anode material for PIBs,would further motivate the subsequent batteries research on M_(3)(OH)_(2)V_(2)O_(7)-n H_(2)O(M;Co,Ni,Cu,Zn),and ultimately expands valuable fundamental understanding on designing other high-performance electrode materials,including the combined strategies of multielectron transfer with rational porous crystal framework,and the composite fabrication of 1D electrode nanostructure with conductive carbon matrix.
基金the National Natural Science Foundation of China(Nos.21872021,21671033,22172022 and 22071019).
文摘Molybdenum trioxide(MoO_(3))can be employed as an excellent host for intercalation due to its 2D lay-ered structure that connected by van der Waals interactions.Herein,a series of polyoxometalate-based MoO_(3) composites(Al_(13)@MoO_(3))were successfully prepared by interpolating the Keggin-type polycationic AlO_(4)Al_(12)(OH)_(24)H_(2)O_(12)^(7+)(Al_(13))into MoO_(3)gallery.These composites can be applied to rapidly adsorb the anionic dye methyl orange(MO)through strong electrostatic interactions lead to compact and sta-ble gathering in the surrounding of the numerous charged Al_(13).Adsorption behaviors of composites with the different amount of Al_(13) were determined,these results revealed that Al_(13)-3.34%@MoO_(3)exhibited the most remarkable adsorption capacity.More importantly,the composite maintains superior adsorption capacity for five consecutive adsorption/desorption cycles,suggesting that Al_(13)@MoO_(3)can be an efficient and durable adsorbent.
基金This work was supported by the Natural Science Foundation of Fujian Province[2020J01833]the Fujian Engineering Research Center of New Chinese lacquer Material[No.323030030702]+3 种基金the humbly acknowledge international funding provided by Fujian Agriculture and Forestry University[No.KXB16001A]the Education Research Program for Young and Middle-aged Teachers of Fujian Education Department[No.JAT190132]the open fund of the Key Laboratory of National Forestry&Grassland Bureau for Plant Fiber Functional Materials,Fujian Agriculture and Forestry University[No.2019KFJJ15]Key Laboratory of New Functional Textile Fiber and Material of Fujian Province will open fund project in 2020[MJUKF-FMSM202005,FKLTF 1708].
文摘The heterojunction effect can effectively improve the separation efficiency of the photocatalyst’s photo-generated electron and hole pairs,thereby greatly improving the photocatalytic hydrogen production performance of the photocatalyst.In this paper,Bi_(6)O_(6)(OH)_(3)(NO_(3))_(3)·1.5H_(2)O(BBN)and ZnO are used to construct and synthesize Bi_(6)O_(6)(OH)_(3)(NO_(3))_(3)·1.5H_(2)O/ZnO(BBN/ZnO)heterojunction photocatalyst.Under UV-vis light irradiation,the BBN/ZnO composite could generate H_(2)with a rate of 28.66μmol·g^(−1)·h^(−1),which is higher than pure BBN(0.92μmol·g^(−1)·h^(−1))and ZnO(6.54μmol·h^(−1)·g^(−1))at around 31.1 and 4.4 times,respectively.Moreover,the experimental results found that the composite still exhibits excellent photocatalytic activity and maintains a high and stable activity in the 12-hour experiment with 3 cycles.The possible mechanism to enhance the photocatalytic behavior is attributed to the expanded light absorption range,reduced surface migration resistance,and inhibited recombination of photo-generated electron and hole pairs.
