As an emergent energy carrier,ammonia benefits from a well-established industrial infrastructure for its transportation and production,positioning it as a promising candidate toward a carbon-free energy landscape.With...As an emergent energy carrier,ammonia benefits from a well-established industrial infrastructure for its transportation and production,positioning it as a promising candidate toward a carbon-free energy landscape.Within this context,the electrocatalytic ammonia oxidation reaction(AOR)is pivotal.Platinum(Pt),recognized as the most efficient AOR catalyst,has undergone extensive development over the years,yielding notable advancements across various domains,ranging from elucidating the reaction mechanism to exploring innovative materials.This review begins by elucidating the mechanism of ammonia oxidation,summarizing the evolution of the mechanism and the diverse intermediates identified through various detection methods.Subsequently,it outlines the research progress surrounding different Pt-based catalysts,followed by a discussion on standard protocols for electrochemical ammonia oxidation testing,which facilitates meaningful comparisons across studies and catalyzes the development of more efficient and potent catalysts.Moreover,the review addresses current challenges in ammonia oxidation and outlines potential future directions,providing a comprehensive outlook on the field.展开更多
The development of technologically advanced fiber-based flexible microelectrodes has been of extensive research interest in healthcare systems because of their unique construction and synergistic effect on multifuncti...The development of technologically advanced fiber-based flexible microelectrodes has been of extensive research interest in healthcare systems because of their unique construction and synergistic effect on multifunctional properties.In this work,we constructed functional MXene fiber(MXF)by a simple and versatile wet spinning method,and then,a well-aligned ZIF-67 nanoarray was grown in situ on the surface.Using the chemical vapor deposition(CVD)method,carbon nanotubes(CNTs)were produced on MXF via the pyrolysis of ZIF-67 and melamine.Finally,Pt nanoparticles were electrodeposited on the CNTs forest,and a Pt@CNTs/MXF electrode was obtained.Owing to the plethora of surface active sites and the synergistic effects between MXene,CNTs,and Pt nanoparticles,the as-fabricated fiber electrode enabled the precise detection of ammonia under alkaline conditions via differential pulse voltammetry(DPV),which exhibited a linear range of 0.1μM–10 mM and a detection limit of 73.2 nM.Due to their good performance in ammonia detection,Pt@CNTs/MXF electrodes could be adopted to determine the ammonia concentration in urine for clinical estimation,which provides a practical approach for the diagnosis of urinary ammonia-associated diseases.展开更多
基金the National Key Research and Development Program of China(No.2022YFB4102000)the National Natural Science Foundation of China(Nos.22102018 and 52171201)+5 种基金the Huzhou Science and Technology Bureau(No.2022GZ45)the China Postdoctoral Science Foundation-Funded Project(No.2022M710601)the Huzhou Science and Technology Bureau(No.2023GZ02)the Natural Science Foundation of Sichuan Province(No.24NSFSC5779)the National Natural Science Foundation of China(Nos.22322201 and 22278067)the Natural Science Foundation of Sichuan Province(No.2023NSFSC0094)。
文摘As an emergent energy carrier,ammonia benefits from a well-established industrial infrastructure for its transportation and production,positioning it as a promising candidate toward a carbon-free energy landscape.Within this context,the electrocatalytic ammonia oxidation reaction(AOR)is pivotal.Platinum(Pt),recognized as the most efficient AOR catalyst,has undergone extensive development over the years,yielding notable advancements across various domains,ranging from elucidating the reaction mechanism to exploring innovative materials.This review begins by elucidating the mechanism of ammonia oxidation,summarizing the evolution of the mechanism and the diverse intermediates identified through various detection methods.Subsequently,it outlines the research progress surrounding different Pt-based catalysts,followed by a discussion on standard protocols for electrochemical ammonia oxidation testing,which facilitates meaningful comparisons across studies and catalyzes the development of more efficient and potent catalysts.Moreover,the review addresses current challenges in ammonia oxidation and outlines potential future directions,providing a comprehensive outlook on the field.
基金supported by the National Natural Science Foundation of China(No.51504168)the Key Research and Development Plan Project in Hubei Province(No.2022BAD009)the Graduate Education Innovation Foundation of Wuhan Institute of Technology(No.CX2022222).
文摘The development of technologically advanced fiber-based flexible microelectrodes has been of extensive research interest in healthcare systems because of their unique construction and synergistic effect on multifunctional properties.In this work,we constructed functional MXene fiber(MXF)by a simple and versatile wet spinning method,and then,a well-aligned ZIF-67 nanoarray was grown in situ on the surface.Using the chemical vapor deposition(CVD)method,carbon nanotubes(CNTs)were produced on MXF via the pyrolysis of ZIF-67 and melamine.Finally,Pt nanoparticles were electrodeposited on the CNTs forest,and a Pt@CNTs/MXF electrode was obtained.Owing to the plethora of surface active sites and the synergistic effects between MXene,CNTs,and Pt nanoparticles,the as-fabricated fiber electrode enabled the precise detection of ammonia under alkaline conditions via differential pulse voltammetry(DPV),which exhibited a linear range of 0.1μM–10 mM and a detection limit of 73.2 nM.Due to their good performance in ammonia detection,Pt@CNTs/MXF electrodes could be adopted to determine the ammonia concentration in urine for clinical estimation,which provides a practical approach for the diagnosis of urinary ammonia-associated diseases.
