Ni-WC composite coating was obtained by using composite electrodeposition technique. The behavior of Ni-WC composite coating used as cathode material for hydro gen evolution reaction (HER) in a medium of 0.1 mol .L-1H...Ni-WC composite coating was obtained by using composite electrodeposition technique. The behavior of Ni-WC composite coating used as cathode material for hydro gen evolution reaction (HER) in a medium of 0.1 mol .L-1H2SO4+0.5mol.L-1 Na2SO4 was inverstigated. The experimental results show that the catalytic activity of Ni-WC composite electrode for HER in weak acidic medium is appearently higher than that of the electrode plated with Ni and is increased with the increasing of WC content in the coating. As compared with Ni plated electrode, the increase in catalytic activity of the composite electrode for HER should be attributed to the dispersion of WC particles in the Ni deposit, since the mechanism of HER for the two kinds of electrodes is the same.Owing to the incorporation of WC particles in Ni deposit, the standard activation free enthalpy for HER is decreased, and the defects and dislocations in the crystal sturcture of the composite coating are increased. This is equivalent to the addition of catalysis accelerator WC in the catalyst Ni.展开更多
Designing highly efficient Pt-free electrocatalysts with low overpotential for an alkaline hydrogen evolution reaction(HER)remains a significant challenge.Here,a novel and efficient cobalt(Co),ruthenium(Ru)bimetallic ...Designing highly efficient Pt-free electrocatalysts with low overpotential for an alkaline hydrogen evolution reaction(HER)remains a significant challenge.Here,a novel and efficient cobalt(Co),ruthenium(Ru)bimetallic electrocatalyst composed of CoRu nanoalloy decorated on the N-doped carbon nanotubes(CoRu@N-CNTs),was prepared by reacting fullerenol with melamine via hydrothermal treatment and followed by pyrolysis.Benefiting from the electronic communication between Co and Ru sites,the as-obtained CoRu@N-CNTs catalyst exhibited superior electrocatalytic HER activity.To deliver a current density of 10 mA·cm^(-2),it required an overpotential of merely 19 mV along with a Tafel slope of 26.19 mV·dec^(-1)in 1 mol·L^(-1)potassium hydroxide(KOH)solution,outperforming the benchmark Pt/C catalyst.The present work would pave a new way towards the design and construction of an efficient electrocatalyst for energy storage and conversion.展开更多
文摘Ni-WC composite coating was obtained by using composite electrodeposition technique. The behavior of Ni-WC composite coating used as cathode material for hydro gen evolution reaction (HER) in a medium of 0.1 mol .L-1H2SO4+0.5mol.L-1 Na2SO4 was inverstigated. The experimental results show that the catalytic activity of Ni-WC composite electrode for HER in weak acidic medium is appearently higher than that of the electrode plated with Ni and is increased with the increasing of WC content in the coating. As compared with Ni plated electrode, the increase in catalytic activity of the composite electrode for HER should be attributed to the dispersion of WC particles in the Ni deposit, since the mechanism of HER for the two kinds of electrodes is the same.Owing to the incorporation of WC particles in Ni deposit, the standard activation free enthalpy for HER is decreased, and the defects and dislocations in the crystal sturcture of the composite coating are increased. This is equivalent to the addition of catalysis accelerator WC in the catalyst Ni.
基金supported by the National Natural Science Foundation of China(No.52072226,U22A20144)Key Research and Development Program of Shaanxi(2024GX-YBXM-466)+1 种基金Science and Technology Program of Xi'an,China(22GXFW0013)Science and Technology Program of Weiyang District of Xi'an,China(202315)。
文摘Designing highly efficient Pt-free electrocatalysts with low overpotential for an alkaline hydrogen evolution reaction(HER)remains a significant challenge.Here,a novel and efficient cobalt(Co),ruthenium(Ru)bimetallic electrocatalyst composed of CoRu nanoalloy decorated on the N-doped carbon nanotubes(CoRu@N-CNTs),was prepared by reacting fullerenol with melamine via hydrothermal treatment and followed by pyrolysis.Benefiting from the electronic communication between Co and Ru sites,the as-obtained CoRu@N-CNTs catalyst exhibited superior electrocatalytic HER activity.To deliver a current density of 10 mA·cm^(-2),it required an overpotential of merely 19 mV along with a Tafel slope of 26.19 mV·dec^(-1)in 1 mol·L^(-1)potassium hydroxide(KOH)solution,outperforming the benchmark Pt/C catalyst.The present work would pave a new way towards the design and construction of an efficient electrocatalyst for energy storage and conversion.
