We report a very convenient and cost-effective approach for the fabrication of a self-supported Co@CoTe_(2)electrode comprising CoTe_(2)nanoparticles used for water oxidation catalysis,which is achieved by one-step hy...We report a very convenient and cost-effective approach for the fabrication of a self-supported Co@CoTe_(2)electrode comprising CoTe_(2)nanoparticles used for water oxidation catalysis,which is achieved by one-step hydrothermal treatment of commercially available cobalt foam.The characteristics of the as-fabricated Co@CoTe_(2)electrode in terms of the crystal structure,surface morphology and chemical components were analyzed.Moreover,the electrochemical properties of the Co@CoTe_(2)electrocatalyst used for water electrolysis were comprehensively investigated.When used to catalyze the oxygen evolution reaction(OER)in 1.0 M KOH,Co@CoTe_(2)electrodes exhibit outstanding catalytic activity and long-term durability,thus outperforming many well-studied cobalt based dichalcogenides(including tellurides,selenides and sulfides)that have been recently reported in the literature.Particularly,Co@CoTe_(2)prepared at 240℃(Co@CoTe_(2)-240)requires a low overpotential of only 286 mV to attain an anodic current density of 10 mA cm^(−2)and shows fast kinetics for the OER with a small Tafel slope of 42 mV dec^(−1).Moreover,the overpotential needed to maintain 10 mA cm^(−2)is merely increased by 20 mV after continuous OER electrolysis for 16 hours,exhibiting excellent long-term stability.Given the commercial availability of porous Co foam,the convenient and scalable approach of hydrothermal synthesis and the outstanding catalytic performance,the self-supported Co@CoTe_(2)electrode reported here holds great promise as an important OER electrocatalyst in water splitting devices and metal–air batteries.展开更多
基金financial support by the Open Project Program of Wuhan National Laboratory for Optoelectronics(No.2019WNLOKF018)the National Key Research and Development Program(No.2017YFE0192600)the Independent Innovation Foundation of Wuhan University of Technology(No.205201042)for the financial support for this research.
文摘We report a very convenient and cost-effective approach for the fabrication of a self-supported Co@CoTe_(2)electrode comprising CoTe_(2)nanoparticles used for water oxidation catalysis,which is achieved by one-step hydrothermal treatment of commercially available cobalt foam.The characteristics of the as-fabricated Co@CoTe_(2)electrode in terms of the crystal structure,surface morphology and chemical components were analyzed.Moreover,the electrochemical properties of the Co@CoTe_(2)electrocatalyst used for water electrolysis were comprehensively investigated.When used to catalyze the oxygen evolution reaction(OER)in 1.0 M KOH,Co@CoTe_(2)electrodes exhibit outstanding catalytic activity and long-term durability,thus outperforming many well-studied cobalt based dichalcogenides(including tellurides,selenides and sulfides)that have been recently reported in the literature.Particularly,Co@CoTe_(2)prepared at 240℃(Co@CoTe_(2)-240)requires a low overpotential of only 286 mV to attain an anodic current density of 10 mA cm^(−2)and shows fast kinetics for the OER with a small Tafel slope of 42 mV dec^(−1).Moreover,the overpotential needed to maintain 10 mA cm^(−2)is merely increased by 20 mV after continuous OER electrolysis for 16 hours,exhibiting excellent long-term stability.Given the commercial availability of porous Co foam,the convenient and scalable approach of hydrothermal synthesis and the outstanding catalytic performance,the self-supported Co@CoTe_(2)electrode reported here holds great promise as an important OER electrocatalyst in water splitting devices and metal–air batteries.
