Highly active and cost-effective oxygen evolution reaction electrocatalysts have become essential to replace commercial electrocatalysts that rely on rare noble metals.High-entropy sulfide nanomaterials,characterized ...Highly active and cost-effective oxygen evolution reaction electrocatalysts have become essential to replace commercial electrocatalysts that rely on rare noble metals.High-entropy sulfide nanomaterials,characterized by abundant randomly distributed elements and inherent stability,possess significant potential for applications.However,challenges such as uneven composition,partial oxidation,or imprecise synthesis control still remain in the materials preparation.Herein,a simple and effective two-step hydrothermal method was employed to synthesize NiCoFeCuS nanoparticles supported on foam nickel substrate.With the catalytic active sites produced by electron density redistribution in high-entropy and sulfurization,NiCoFeCuS exhibits excellent alkaline OER performance,with an overpotential of 261 mV and a Tafel slope of 57.97 mV dec^(−1) at the current density of 10 mA cm^(−2),which is only 88%of commercial RuO_(2) without any noble metals.展开更多
To improve room-temperature hydrogen storage, palladium (Pd) nanoparticles were innovatively decorated by carbon bridge onto the amino-group functioned Zr-terephthalate metal-organic framework (MOF) UiO-66 to reduce t...To improve room-temperature hydrogen storage, palladium (Pd) nanoparticles were innovatively decorated by carbon bridge onto the amino-group functioned Zr-terephthalate metal-organic framework (MOF) UiO-66 to reduce the diffusion energy barrier and then improve the hydrogen spillover effect. Powder X-ray diffraction shows broad Pd peak and retained UiO-66-NH_(2) integrity after Pd decoration. The hydrogen uptake capacity show that UiO-66-NH_(2)-Pd exhibits best hydrogen storage performance than UiO-66-NH_(2) and pristine UiO-66. The hydrogen up taken in Pd decorated UiO-66 (UiO-66-NH_(2)-1Pd) was close to 4 wt% under 20 MPa at room temperature. Density functional theory (DFT) calculations show that hydrogen adsorption energy of UiO-66-NH_(2)-Pd was −0.5897 eV, which was much lower than that of UiO-66-NH_(2) (−0.3716 eV) and UiO-66 (−0.2975 eV). Ultimately, Pd decorated NH_(2) group functioned UiO-66 enable improve storage capacities through hydrogen spillover under ambient conditions which could satisfy the demand for sustainable energy, especially for the long-term storage energy media.展开更多
基金supported by the Natural Science Foundation of Sichuan Province(grant No.2023NSFSC0971)the Science and Technology on Surface Physics and Chemistry Laboratory Fund(grant No.XKFZ202105).
文摘Highly active and cost-effective oxygen evolution reaction electrocatalysts have become essential to replace commercial electrocatalysts that rely on rare noble metals.High-entropy sulfide nanomaterials,characterized by abundant randomly distributed elements and inherent stability,possess significant potential for applications.However,challenges such as uneven composition,partial oxidation,or imprecise synthesis control still remain in the materials preparation.Herein,a simple and effective two-step hydrothermal method was employed to synthesize NiCoFeCuS nanoparticles supported on foam nickel substrate.With the catalytic active sites produced by electron density redistribution in high-entropy and sulfurization,NiCoFeCuS exhibits excellent alkaline OER performance,with an overpotential of 261 mV and a Tafel slope of 57.97 mV dec^(−1) at the current density of 10 mA cm^(−2),which is only 88%of commercial RuO_(2) without any noble metals.
基金supportedby the National Natural Science Foundation of China(No.52371242).
文摘To improve room-temperature hydrogen storage, palladium (Pd) nanoparticles were innovatively decorated by carbon bridge onto the amino-group functioned Zr-terephthalate metal-organic framework (MOF) UiO-66 to reduce the diffusion energy barrier and then improve the hydrogen spillover effect. Powder X-ray diffraction shows broad Pd peak and retained UiO-66-NH_(2) integrity after Pd decoration. The hydrogen uptake capacity show that UiO-66-NH_(2)-Pd exhibits best hydrogen storage performance than UiO-66-NH_(2) and pristine UiO-66. The hydrogen up taken in Pd decorated UiO-66 (UiO-66-NH_(2)-1Pd) was close to 4 wt% under 20 MPa at room temperature. Density functional theory (DFT) calculations show that hydrogen adsorption energy of UiO-66-NH_(2)-Pd was −0.5897 eV, which was much lower than that of UiO-66-NH_(2) (−0.3716 eV) and UiO-66 (−0.2975 eV). Ultimately, Pd decorated NH_(2) group functioned UiO-66 enable improve storage capacities through hydrogen spillover under ambient conditions which could satisfy the demand for sustainable energy, especially for the long-term storage energy media.
