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)).
