It is highly desirable but still a challenging task to find a simple,fast and straightforward method to greatly improve the alkaline oxygen evolution reaction(OER)performance of a NiCo_(2)O_(4)catalyst.In this communi...It is highly desirable but still a challenging task to find a simple,fast and straightforward method to greatly improve the alkaline oxygen evolution reaction(OER)performance of a NiCo_(2)O_(4)catalyst.In this communication,we demonstrate that developing an amorphous borate shell on a NiCo_(2)O_(4)surface can boost its OER activity in alkaline media.As a 3D catalyst electrode,a NiCo_(2)O_(4)@Ni–Co–B nanoarray on carbon cloth needs an overpotential of only 270 mV to achieve a geometrical catalytic current density of 10 mA cm^(−2)in 1.0 M KOH,which is 100 mV less than that for a NiCo_(2)O_(4)nanoarray.Notably,this electrode also demonstrates strong electrochemical durability,maintaining its activity for at least 100 h.The superior activity of NiCo_(2)O_(4)@Ni–Co–B is attributed to the amorphous Ni–Co–B shell on NiCo_(2)O_(4)favoring the in situ electrochemical generation of more active species during water oxidation.展开更多
A new photoelectrocatalytic water purification system was investigated by combining photocatalysis and electrochemistry.This configuration achieves simultaneous removal of both organic compounds and inorganic heavy me...A new photoelectrocatalytic water purification system was investigated by combining photocatalysis and electrochemistry.This configuration achieves simultaneous removal of both organic compounds and inorganic heavy metal ions from water by taking a carbon electrode as the working electrode and another electrode coated with a photocatalyst as the counter electrode.A negative bias potential is imparted onto the working electrode to induce the reduction of heavy metal ions,whereas the photocatalytic degradation of organic pollutants on the counter electrode is amplified via the transfer of photoexcited electrons from the counter electrode to the working electrode.Evaluations conducted in bulk solutions demonstrated that photoelectrocatalysis surpassed photocatalysis by yielding an organic matter degradation efficiency 2.3 times higher,successfully degrading 98%of a 10μM methylene blue solution within 2 h.Simultaneously,the system realized the recovery of heavy metal ions,including copper,lead,and cadmium.This new photoelectrocatalytic water purification system was further integrated with microchannels,and the testing data affirm the substantial potential for system miniaturization.展开更多
基金supported by the National Natural Science Foundation of China(No.21575137 and 21375076).
文摘It is highly desirable but still a challenging task to find a simple,fast and straightforward method to greatly improve the alkaline oxygen evolution reaction(OER)performance of a NiCo_(2)O_(4)catalyst.In this communication,we demonstrate that developing an amorphous borate shell on a NiCo_(2)O_(4)surface can boost its OER activity in alkaline media.As a 3D catalyst electrode,a NiCo_(2)O_(4)@Ni–Co–B nanoarray on carbon cloth needs an overpotential of only 270 mV to achieve a geometrical catalytic current density of 10 mA cm^(−2)in 1.0 M KOH,which is 100 mV less than that for a NiCo_(2)O_(4)nanoarray.Notably,this electrode also demonstrates strong electrochemical durability,maintaining its activity for at least 100 h.The superior activity of NiCo_(2)O_(4)@Ni–Co–B is attributed to the amorphous Ni–Co–B shell on NiCo_(2)O_(4)favoring the in situ electrochemical generation of more active species during water oxidation.
基金sponsored by Environment and Natural Resources Trust Fund(ENRTF)funding in Minnesota.Portions of this work were conducted in the Minnesota Nano Center,which is supported by the National Science Foundation through the National Nano Coordinated Infrastructure Network(NNCI)under Award Number ECCS-1542202Parts of this work were carried out in the Characterization Facility,University of Minnesota,which receives partial support from the NSF through the NNCI under Award Number ECCS-2025124.
文摘A new photoelectrocatalytic water purification system was investigated by combining photocatalysis and electrochemistry.This configuration achieves simultaneous removal of both organic compounds and inorganic heavy metal ions from water by taking a carbon electrode as the working electrode and another electrode coated with a photocatalyst as the counter electrode.A negative bias potential is imparted onto the working electrode to induce the reduction of heavy metal ions,whereas the photocatalytic degradation of organic pollutants on the counter electrode is amplified via the transfer of photoexcited electrons from the counter electrode to the working electrode.Evaluations conducted in bulk solutions demonstrated that photoelectrocatalysis surpassed photocatalysis by yielding an organic matter degradation efficiency 2.3 times higher,successfully degrading 98%of a 10μM methylene blue solution within 2 h.Simultaneously,the system realized the recovery of heavy metal ions,including copper,lead,and cadmium.This new photoelectrocatalytic water purification system was further integrated with microchannels,and the testing data affirm the substantial potential for system miniaturization.
