Two-dimensional Sn2Ta2O7 nanosheets with a thickness of^10 nm were successfully prepared through a novel tantalic acid-based solid-state reaction method at reduced temperature.The as-obtained samples were characterize...Two-dimensional Sn2Ta2O7 nanosheets with a thickness of^10 nm were successfully prepared through a novel tantalic acid-based solid-state reaction method at reduced temperature.The as-obtained samples were characterized by powder X-ray diffraction(XRD),ultraviolet–visible(UV–Vis)diffuse reflectance spectra,scanning electron microscopy(SEM),transmission electron microscopy(TEM)and Brunauer–Emmett–Teller(BET)analysis.The photocatalytic performance of Sn2 Ta2 O7 nanosheets was evaluated by photocatalytic water splitting for hydrogen evolution under visible light irradiation(k C 400 nm).The Sn2Ta2O7 nanosheets with a large surface area of 25.9 m^2·g^-1 showed higher H2 production activity,which was about 4.4 times higher than that of bulk Sn2 Ta2O7 in lactic acid aqueous solutions using Pt as a cocatalyst.The improved photocatalytic performance mainly benefited from the nanosheet structure,which provided abundant surface active sites and facilitated the photogenerated charge carrier separation efficiently.This workmay open up new opportunity to develop novel nanostructured tantalum-based semiconductors with improved catalytic performance for solar energy conversion.展开更多
Nitrogen-doped Zn-Ni oxide nanoparticles prepared by ammonia treatment are efficient electrocatalysts for CO_(2) reduction to CO.The single-phase nanostructures of N-Zn-Ni oxide nanoparticles exhibited high electrocat...Nitrogen-doped Zn-Ni oxide nanoparticles prepared by ammonia treatment are efficient electrocatalysts for CO_(2) reduction to CO.The single-phase nanostructures of N-Zn-Ni oxide nanoparticles exhibited high electrocatalytic CO_(2) reduction activity with CO Faradaic efficiency of 91.5% and partial current density of 3.2 mA·cm^(-2) at-0.95 V(vs.reversible hydrogen electrode’RHE) in NaCl aqueous solution.Furthermore’ N-Zn-Ni oxides catalyst achieved CO Faradaic efficiency over 89%at—0.8 V(vs.RHE) in natural seawater’ much better than the CO_(2) reduction activity of benchmark Ag/C catalysts in seawater’ and demonstrated strong tolerance to several metal ion impurities with retained CO selectivity.The notable reactivity toward CO_(2) reduction and contamination-tolerance is attributed to peculiar synergistic effect from binary Zn-Ni oxide and nitrogen doping.展开更多
Burning of fuels is an irreversible entropy increasing process,requiring additional energies derived from the environment to let the process cycle.In theory,photon energy delivered from the sun could fix the huge ener...Burning of fuels is an irreversible entropy increasing process,requiring additional energies derived from the environment to let the process cycle.In theory,photon energy delivered from the sun could fix the huge energy demand in a clean and sustainable way.Photocatalysis is such an ideal approach to reconvert inert molecules directly into fuels and other chemical feedstocks using photon energy without any other energy inputs.展开更多
基金financially supported by the National Key R&D Program of China (Nos. 2017YFA0206904, 2017YFA0206900 and 2016YFB0600901)the National Natural Science Foundation of China (Nos. 51825205, U1662118, 51772305, 51572270, 21871279 and 21802154)+4 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB17000000)the Beijing Natural Science Foundation (No. 2182078), the Beijing Municipal Science and Technology Project (No. Z181100005118007)the Royal Society-Newton Advanced Fellowship (No. NA170422)the International Partnership Program of Chinese Academy of Sciences (No. GJHZ1819)the K. C. Wong Education Foundation
文摘Two-dimensional Sn2Ta2O7 nanosheets with a thickness of^10 nm were successfully prepared through a novel tantalic acid-based solid-state reaction method at reduced temperature.The as-obtained samples were characterized by powder X-ray diffraction(XRD),ultraviolet–visible(UV–Vis)diffuse reflectance spectra,scanning electron microscopy(SEM),transmission electron microscopy(TEM)and Brunauer–Emmett–Teller(BET)analysis.The photocatalytic performance of Sn2 Ta2 O7 nanosheets was evaluated by photocatalytic water splitting for hydrogen evolution under visible light irradiation(k C 400 nm).The Sn2Ta2O7 nanosheets with a large surface area of 25.9 m^2·g^-1 showed higher H2 production activity,which was about 4.4 times higher than that of bulk Sn2 Ta2O7 in lactic acid aqueous solutions using Pt as a cocatalyst.The improved photocatalytic performance mainly benefited from the nanosheet structure,which provided abundant surface active sites and facilitated the photogenerated charge carrier separation efficiently.This workmay open up new opportunity to develop novel nanostructured tantalum-based semiconductors with improved catalytic performance for solar energy conversion.
基金financially supported by the National Key R&D Program of China (No.2016YFB0600901)。
文摘Nitrogen-doped Zn-Ni oxide nanoparticles prepared by ammonia treatment are efficient electrocatalysts for CO_(2) reduction to CO.The single-phase nanostructures of N-Zn-Ni oxide nanoparticles exhibited high electrocatalytic CO_(2) reduction activity with CO Faradaic efficiency of 91.5% and partial current density of 3.2 mA·cm^(-2) at-0.95 V(vs.reversible hydrogen electrode’RHE) in NaCl aqueous solution.Furthermore’ N-Zn-Ni oxides catalyst achieved CO Faradaic efficiency over 89%at—0.8 V(vs.RHE) in natural seawater’ much better than the CO_(2) reduction activity of benchmark Ag/C catalysts in seawater’ and demonstrated strong tolerance to several metal ion impurities with retained CO selectivity.The notable reactivity toward CO_(2) reduction and contamination-tolerance is attributed to peculiar synergistic effect from binary Zn-Ni oxide and nitrogen doping.
文摘Burning of fuels is an irreversible entropy increasing process,requiring additional energies derived from the environment to let the process cycle.In theory,photon energy delivered from the sun could fix the huge energy demand in a clean and sustainable way.Photocatalysis is such an ideal approach to reconvert inert molecules directly into fuels and other chemical feedstocks using photon energy without any other energy inputs.
