Pure silica zeolite MFI(silicalite-1)has been widely used in gas separation and volatile organic compounds(VOCs)adsorption.The molar ratio of tetrapropylammonium(TPA^(+))and SiO_(2)(TPA^(+)/SiO_(2))included in the fra...Pure silica zeolite MFI(silicalite-1)has been widely used in gas separation and volatile organic compounds(VOCs)adsorption.The molar ratio of tetrapropylammonium(TPA^(+))and SiO_(2)(TPA^(+)/SiO_(2))included in the framework of silicalite-1 is 0.042.Reducing the utilization of TPA^(+)will not only benefit the environment but also reduce the cost of silicalite-1.Herein,we reported the synthesis of highly crystalline silicalite-1 from a reaction mixture with a TPA^(+)/SiO_(2)molar ratio of 0.035 and a seed loading of 5 wt%or 0.01 and a seed loading of 10 wt%.展开更多
Hollow nanostructured materials have numerous applications in various fields,such as electrochemical energy storage and electrocatalysis.These materials are commonly synthesized by template-based techniques.However,ma...Hollow nanostructured materials have numerous applications in various fields,such as electrochemical energy storage and electrocatalysis.These materials are commonly synthesized by template-based techniques.However,many templating methods are known to be time-consuming,laborious,and unsuitable for large-scale production.Here,for the first time,we find that borax can efficiently promote the formation of hollow metal oxide and metal in solution.The key role of borax is recognized as a structuredirecting agent,different from the reported hard templating or Ostwald ripening.We prepared hollow Cu_(2)O nanospheres and Cu_(2)O coated hollow Cu single crystals(Cu/Cu_(2)O)under different reduction conditions by this scalable template-free method.The hollow structure improves the density of active sites per unit mass,meanwhile the well-defined Cu/Cu_(2)O heterojunction with a single-crystalline Cu core facilitates electron transfer.Therefore,the Cu/Cu_(2)O shows excellent electrocatalytic activities for glucose oxidation and hydrogen peroxide reduction.The as-fabricated nonenzymatic sensor has an ultrawide linear measurement range(up to 14 mM glucose)and high detection sensitivity for glucose(453μA cm^(−2) mM^(−1))and hydrogen peroxide(2.55μA cm^(−2) mM^(−1)).展开更多
基金support from the National Natural Science Foundation of China(U1967215,21835002,21621001,and 21875221)the 111 Project of China(B17020).
文摘Pure silica zeolite MFI(silicalite-1)has been widely used in gas separation and volatile organic compounds(VOCs)adsorption.The molar ratio of tetrapropylammonium(TPA^(+))and SiO_(2)(TPA^(+)/SiO_(2))included in the framework of silicalite-1 is 0.042.Reducing the utilization of TPA^(+)will not only benefit the environment but also reduce the cost of silicalite-1.Herein,we reported the synthesis of highly crystalline silicalite-1 from a reaction mixture with a TPA^(+)/SiO_(2)molar ratio of 0.035 and a seed loading of 5 wt%or 0.01 and a seed loading of 10 wt%.
基金financially supported by the National Natural Science Foundation Program of China(51604025,51574031,51574030,51574029,and 51604240)the Natural Science Foundation Program of Beijing(2174079 and 2162027)the Fundamental Research Funds for the Central Universities(FRF-TP-17-034A2).
文摘Hollow nanostructured materials have numerous applications in various fields,such as electrochemical energy storage and electrocatalysis.These materials are commonly synthesized by template-based techniques.However,many templating methods are known to be time-consuming,laborious,and unsuitable for large-scale production.Here,for the first time,we find that borax can efficiently promote the formation of hollow metal oxide and metal in solution.The key role of borax is recognized as a structuredirecting agent,different from the reported hard templating or Ostwald ripening.We prepared hollow Cu_(2)O nanospheres and Cu_(2)O coated hollow Cu single crystals(Cu/Cu_(2)O)under different reduction conditions by this scalable template-free method.The hollow structure improves the density of active sites per unit mass,meanwhile the well-defined Cu/Cu_(2)O heterojunction with a single-crystalline Cu core facilitates electron transfer.Therefore,the Cu/Cu_(2)O shows excellent electrocatalytic activities for glucose oxidation and hydrogen peroxide reduction.The as-fabricated nonenzymatic sensor has an ultrawide linear measurement range(up to 14 mM glucose)and high detection sensitivity for glucose(453μA cm^(−2) mM^(−1))and hydrogen peroxide(2.55μA cm^(−2) mM^(−1)).
