Using nickel foam（NF）as both substrate and nickel（Ni）source,nickel-based phosphate was synthesized via a one-step hydrothermal method with acid-etched NF.The compositions,microstructures,and elemental valence states of the as-prepared materials were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,and X-ray photoelectron spectroscopy（XPS）.Effects of different acidic etchants on the hydrogen evolution reaction（HER）performance of the prepared electrocatalysts in a 1mol/LKOH alkaline electrolyte were systematically investigated.Results showed that the electrocatalyst NH₄NiPO₄@NF,hydrothermally synthesized after nitric acid（HNO₃）etching of NF ,exhibited excellent electrocatalytic performance with achieving an overpotential of 141 mV at a current density of 100A/m² and a Tafel slope of 40mV/dec.Moreover,the overpotential remained nearly unchanged after 3000 cyclic voltammetry cycles.

The impact of heavy objects on beams was studied with the theory of high order shear deformation. The deflection equation of a beam was substituted into the vibration equation as the first-order mode function,and the vibration solution of the beam under impact was derived by using the singular function and Galerkin principle. And the calculation method of the impact of heavy objects on the beam in the dynamic load problem of the material mechanics textbook was discussed and analyzed.It provides a high-precision calculation method for the impact of heavy objects on the beam.The results show that even the shear deformation and the moment of inertia of the thin beam will have a great influence on the calculation of the maximum bending stress and the maximum bending deflection of the beam.