Among all the known electrode materials, vanadium pentoxide(V_(2)O_(5)) has high reversible capacity. It is a very valuable material for research of the complexity, rich structure and morphology. However, it also has ...Among all the known electrode materials, vanadium pentoxide(V_(2)O_(5)) has high reversible capacity. It is a very valuable material for research of the complexity, rich structure and morphology. However, it also has some disadvantages,such as poor cycle stability, low discharge voltage, low conductivity and Li^(+) diffusion coefficient. In this regard, researchers have carried out a lot of research, such as using various methods to improve the nanostructures, introducing heterostructures,introducing point defects or cation doping in the crystal structure, etc. The electrochemical performance of V_(2)O_(5)has been significantly improved in reversible capacity, high-rate capacity and long-term cycle stability. In this paper, V_(2)O_(5)based nanostructure with different chemical composition are briefly introduced, and it covers V_(2)O_(5)nanomaterials with different morphology, including 1D nanorods, nanobelts, nanotubes, 2D leaf like nanosheets and other nanosheets, and 3D hollow structures, porous nanostructures, porous eggshell microsphere structures. The composite nanomaterials of V_(2)O_(5)and different carbonaceous supports are also introduced. Finally, the V_(2)O_(5)composite materials doped with cations are discussed. The electrochemical performance of V_(2)O_(5)based electrode can be improved effectively by obtaining appropriate nanostructure and optimized chemical composition.展开更多
What defines cancer?Numerous factors have been found to be associated with cancer onset and development.Rudolf Virchow suggested some 150 years ago that cancer was causally linked to persistent irritation.Later studie...What defines cancer?Numerous factors have been found to be associated with cancer onset and development.Rudolf Virchow suggested some 150 years ago that cancer was causally linked to persistent irritation.Later studies have revealed that overexposure to radiation,persistent microbial infection,genetic mutations,and chronic(sterile)inflammation could all potentially lead to cancer,and the same has been observed about intermittent hypoxia,iron overload,and intake of certain “carcinogens”.In parallel,considerable information has been collected regarding animals that never or rarely develop cancer,such as blind mole rats and whales.Yet no general frameworks have been published that can functionally link potential drivers to the formation and progression of cancer in a predictable manner,which is consistent with the aforementioned and other epidemiological data.Here,we outline one such framework.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 51702097 and U1804125)the Key Scientific and Technological Research Projects of Henan Province, China (Grant No. 202102210222)。
文摘Among all the known electrode materials, vanadium pentoxide(V_(2)O_(5)) has high reversible capacity. It is a very valuable material for research of the complexity, rich structure and morphology. However, it also has some disadvantages,such as poor cycle stability, low discharge voltage, low conductivity and Li^(+) diffusion coefficient. In this regard, researchers have carried out a lot of research, such as using various methods to improve the nanostructures, introducing heterostructures,introducing point defects or cation doping in the crystal structure, etc. The electrochemical performance of V_(2)O_(5)has been significantly improved in reversible capacity, high-rate capacity and long-term cycle stability. In this paper, V_(2)O_(5)based nanostructure with different chemical composition are briefly introduced, and it covers V_(2)O_(5)nanomaterials with different morphology, including 1D nanorods, nanobelts, nanotubes, 2D leaf like nanosheets and other nanosheets, and 3D hollow structures, porous nanostructures, porous eggshell microsphere structures. The composite nanomaterials of V_(2)O_(5)and different carbonaceous supports are also introduced. Finally, the V_(2)O_(5)composite materials doped with cations are discussed. The electrochemical performance of V_(2)O_(5)based electrode can be improved effectively by obtaining appropriate nanostructure and optimized chemical composition.
文摘What defines cancer?Numerous factors have been found to be associated with cancer onset and development.Rudolf Virchow suggested some 150 years ago that cancer was causally linked to persistent irritation.Later studies have revealed that overexposure to radiation,persistent microbial infection,genetic mutations,and chronic(sterile)inflammation could all potentially lead to cancer,and the same has been observed about intermittent hypoxia,iron overload,and intake of certain “carcinogens”.In parallel,considerable information has been collected regarding animals that never or rarely develop cancer,such as blind mole rats and whales.Yet no general frameworks have been published that can functionally link potential drivers to the formation and progression of cancer in a predictable manner,which is consistent with the aforementioned and other epidemiological data.Here,we outline one such framework.
