The discovery and use of fossil fuels have contributed greatly to human development,yet along with rapid economic development is increasing global warming,destruction of ecosystems and a sharp decline in energy reserves.Therefore,it is particularly important to establish a clean and sustainable energy source on a global scale,and hydrogen fuel is a viable alternative energy source due to its high energy density and abundant natural resources.Hydrogen production by electrolysis of water can effectively convert intermittent electricity obtained from renewable energy sources into more valuable hydrogen,which has the advantages of high flexibility and applicability,and is an environmentally friendly hydrogen production technology with wide application prospects.In this paper,highly active low/non-platinum electrocatalytic materials were designed and prepared mainly by hydrothermal method,and applied to hydrogen precipitation reaction(HER)under full p H conditions by modulating the morphology and electronic structure,and the main research is as follows:1.Ag@Pt ortho-icosahedral nanocrystal catalysts were designed and prepared by a one-step solvothermal synthesis method to alleviate the current shortage of efficient,stable and inexpensive high-current-density electrocatalysts.The geometrical effects and electronic synergy triggered by the differences of different elements greatly enhance the hydrogen precipitation performance of Ag@Pt nanocrystals at high current densities over a wide p H range,broadening their potential industrial applications.Density flooding theory(DFT)calculations show that the electronic synergy due to the core-shell structure weakens the optimal free energy for hydrogen adsorption(ΔGH*),thus promoting the hydrogen decomposition kinetics and greatly enhancing the catalytic performance.2.Self-supported porous 2D Pd/NiFeOx nanosheets with peony flower shape were prepared on nickel foam by hydrothermal and thermal annealing methods.Pd/Ni Fe Oxnanosheets exhibit a large electrochemical active area due to the unique porous structure,exposing more active sites and effectively facilitating the electrolyte diffusion as well as the generation and release of bubbles on the catalyst surface,which can be used as an efficient dual The Pd/Ni Fe Ox nanosheets showed only 76,46 and 75 m V HER overpotentials at current densities up to 10 m A cm-2 under 1 M KOH,0.5 M H2SO4 and1 M phosphate buffered saline(PBS)conditions,and also showed good OER activity over a wide p H range.When porous Pd/Ni Fe Ox nanosheets were used as bifunctional hydrolysis catalysts,a cell voltage of only 1.57 V was required to achieve a current density of 20 m A cm-2.This work provides new ideas for the development of more cost-effective water electrolysis catalysts by improving the utilization of noble metals by modifying them on non-precious metals. |