以V_2O_5,AgNO_3和Y(NO_3)_3×6H_2O为原料、十二烷基苯磺酸钠为辅助剂,采用直接沉淀法和浸渍法制备单斜晶相Ag_3VO_4和Y_2O3_/Ag_3VO_4复合催化剂,表征了产物的结构和形貌,并分析了其形成机理;在可见光下研究了其催化可见光降解罗...以V_2O_5,AgNO_3和Y(NO_3)_3×6H_2O为原料、十二烷基苯磺酸钠为辅助剂,采用直接沉淀法和浸渍法制备单斜晶相Ag_3VO_4和Y_2O3_/Ag_3VO_4复合催化剂,表征了产物的结构和形貌,并分析了其形成机理;在可见光下研究了其催化可见光降解罗丹明B(Rh B)的性能.结果表明,所得Y_2O_3/Ag_3VO_4复合催化剂吸收边相对纯相Ag_3VO_4发生红移,禁带宽度减小至1.83 e V,电子-空穴对复合几率降低,对Rh B有较好的可见光催化活性和稳定性,可见光照射15 min后,0.08 g 3%Y2O_3/Ag_3VO_4催化200 m L 8 mg/L Rh B溶液的降解率达94.2%.展开更多
Over the past few years,the emission of organic pollutants into the environment has increased tremendously.Therefore,various photocatalysts have been developed for the degradation of organic pollutants.In this study,a...Over the past few years,the emission of organic pollutants into the environment has increased tremendously.Therefore,various photocatalysts have been developed for the degradation of organic pollutants.In this study,a step-scheme BiVO4/Ag3VO4 composite was synthesized via a hydrothermal and chemical deposition process for the degradation of methylene blue.The composite showed strong redox ability under visible light.The 40%BiVO4/Ag3VO4 composite showed excellent photocatalytic degradation properties with a Kapp of 0.05588 min^–1,which is 22.76 and 1.76 times higher than those of BiVO4(0.00247 min^–1)and Ag3VO4(0.03167 min^–1),respectively.The composite showed a stable performance and could retain 90%of its photocatalytic activity even after four cycles.The improved catalytic performance of the composite as compared to BiVO4 and Ag3VO4 can be attributed to its novel step-scheme mechanism,which facilitated the separation of the photogenerated charges and increased their lifetime.The photoluminescence measurement results and transient photocurrent response revealed that the composite showed efficient extraction of charge carriers.展开更多
Due to the high capacity,moderate voltage platform,and stable structure,Li3VO4(LVO) has attracted close attention as feasible anode material for lithium-ion capacitor.However,the intrinsic low electronic conductivity ...Due to the high capacity,moderate voltage platform,and stable structure,Li3VO4(LVO) has attracted close attention as feasible anode material for lithium-ion capacitor.However,the intrinsic low electronic conductivity and sluggish kinetics of the Li+ insertion process severely impede its practical application in lithium-ion capacitors(LICs).Herein,a carbon-coated Li3VO4(LVO/C) hierarchical structure was prepared by a facial one-step solid-state method.The synthesized LVO/C composite delivers an impressive capacity of 435 mAh/g at 0.07 A/g,remarkable rate capability,and nearly 100% capacity retention after 500 cycles at 0.5 A/g.The superior electrochemical properties of LVO/C composite materials are attributed to the improved conductivity of electron and stable carbon/LVO composite structures.Besides,the LIC device based on activated carbon(AC) cathode and optimal LVO/C as anode reveals a maximum energy density of 110 Wh/kg and long-term cycle life.These results provide a potential way for assembling the advanced hybrid lithium-ion capacitors.展开更多
Vanadium oxide Li3VO4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential （vs. Li metal）, high specific capacity and its cost is low. Howev...Vanadium oxide Li3VO4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential （vs. Li metal）, high specific capacity and its cost is low. However, the poor electronic conductivity and initial low coulombic efficiency limit its practical application. In this mini-review, the state-of-the-art results associated with Li3VO4 are summarized including structure, lithium insertion mechanism, preparation, modification, and electrochemical properties. Finally, the challenges and prospects are also discussed.展开更多
Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance....Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance. In this work, we fabricate carbon coated Li3VO4(C@LVO) rods by a facile morphology inheritance route. The as-prepared C@LVO rods are 400–800 nm in length and 200–400 nm in diameter,and orthorhombic phase with V5+. The unique core-shell rods structure greatly improves the transport ability of electrons and Li+. Such C@LVO submicron-rods as anode materials exhibit excellent rate capability(a reversible capability of 460,438, 416, 359 and 310 m A h g^-1 at 0.2, 1, 2, 5 and 10 C, respectively) and a high stable capacity of 440 and 313 m A h g^-1 up to 300 cycles at 0.2 and 5 C, respectively.展开更多
文摘以V_2O_5,AgNO_3和Y(NO_3)_3×6H_2O为原料、十二烷基苯磺酸钠为辅助剂,采用直接沉淀法和浸渍法制备单斜晶相Ag_3VO_4和Y_2O3_/Ag_3VO_4复合催化剂,表征了产物的结构和形貌,并分析了其形成机理;在可见光下研究了其催化可见光降解罗丹明B(Rh B)的性能.结果表明,所得Y_2O_3/Ag_3VO_4复合催化剂吸收边相对纯相Ag_3VO_4发生红移,禁带宽度减小至1.83 e V,电子-空穴对复合几率降低,对Rh B有较好的可见光催化活性和稳定性,可见光照射15 min后,0.08 g 3%Y2O_3/Ag_3VO_4催化200 m L 8 mg/L Rh B溶液的降解率达94.2%.
文摘Over the past few years,the emission of organic pollutants into the environment has increased tremendously.Therefore,various photocatalysts have been developed for the degradation of organic pollutants.In this study,a step-scheme BiVO4/Ag3VO4 composite was synthesized via a hydrothermal and chemical deposition process for the degradation of methylene blue.The composite showed strong redox ability under visible light.The 40%BiVO4/Ag3VO4 composite showed excellent photocatalytic degradation properties with a Kapp of 0.05588 min^–1,which is 22.76 and 1.76 times higher than those of BiVO4(0.00247 min^–1)and Ag3VO4(0.03167 min^–1),respectively.The composite showed a stable performance and could retain 90%of its photocatalytic activity even after four cycles.The improved catalytic performance of the composite as compared to BiVO4 and Ag3VO4 can be attributed to its novel step-scheme mechanism,which facilitated the separation of the photogenerated charges and increased their lifetime.The photoluminescence measurement results and transient photocurrent response revealed that the composite showed efficient extraction of charge carriers.
基金funded by the National Natural Science Foundation of China(Nos.51677182 and 51822706)the DNL Cooperation Fund(No.DNL201915)+1 种基金the Beijing Municipal Science and Technology Commission(No.Z181100000118006)the Beijing Nova Program(No.Z171100001117073)。
文摘Due to the high capacity,moderate voltage platform,and stable structure,Li3VO4(LVO) has attracted close attention as feasible anode material for lithium-ion capacitor.However,the intrinsic low electronic conductivity and sluggish kinetics of the Li+ insertion process severely impede its practical application in lithium-ion capacitors(LICs).Herein,a carbon-coated Li3VO4(LVO/C) hierarchical structure was prepared by a facial one-step solid-state method.The synthesized LVO/C composite delivers an impressive capacity of 435 mAh/g at 0.07 A/g,remarkable rate capability,and nearly 100% capacity retention after 500 cycles at 0.5 A/g.The superior electrochemical properties of LVO/C composite materials are attributed to the improved conductivity of electron and stable carbon/LVO composite structures.Besides,the LIC device based on activated carbon(AC) cathode and optimal LVO/C as anode reveals a maximum energy density of 110 Wh/kg and long-term cycle life.These results provide a potential way for assembling the advanced hybrid lithium-ion capacitors.
基金Acknowledgement Financial supports from National Materials Genome Project （No. 2016YFB0700600）, Natural Distinguished Youth Scientists Project of China （No. 51425301）, National Science Foundation Committee of China （Nos. 21374021 and U1601214） and Science and Technology Commission of Shanghai Municipality （No. 14520721800） are greatly appreciated.
文摘Vanadium oxide Li3VO4 has attracted much attention as anode material for Li-ion batteries in recent years since it has a low and safe redox potential （vs. Li metal）, high specific capacity and its cost is low. However, the poor electronic conductivity and initial low coulombic efficiency limit its practical application. In this mini-review, the state-of-the-art results associated with Li3VO4 are summarized including structure, lithium insertion mechanism, preparation, modification, and electrochemical properties. Finally, the challenges and prospects are also discussed.
基金supported by the National Natural Science Foundation of China(21476019 and 21676017)
文摘Li3VO4 shows great potential as an intercalation/de-intercalation type anode material for energy-storage devices. Morphology tailoring and surface modification are effective to enhance its lithium storage performance. In this work, we fabricate carbon coated Li3VO4(C@LVO) rods by a facile morphology inheritance route. The as-prepared C@LVO rods are 400–800 nm in length and 200–400 nm in diameter,and orthorhombic phase with V5+. The unique core-shell rods structure greatly improves the transport ability of electrons and Li+. Such C@LVO submicron-rods as anode materials exhibit excellent rate capability(a reversible capability of 460,438, 416, 359 and 310 m A h g^-1 at 0.2, 1, 2, 5 and 10 C, respectively) and a high stable capacity of 440 and 313 m A h g^-1 up to 300 cycles at 0.2 and 5 C, respectively.
