Amino-Borane Assisted Preparation Of Tiny Palladium Based Phosphide Nanoparticles For Electrocatalytic Hydrogen Evolution Reaction

Electrocatalysis plays a role as a transfer station in clean energy conversion,and the development of hydrogen production from electrolyzed water should be mainly driven by the development of efficient and stable catalysts.Platinum based materials have the most efficient and stable catalytic ability in both acidic and alkaline environments.The contradiction is that the low storage of platinum leads to high price.In order to reduce the cost of electrocatalytic hydrogen production,it is imperative to develop non platinum based high-efficiency electrocatalysts.In this paper,palladium based materials with similar physical and chemical properties to platinum are selected as the main research object,and an attempt is made to develop a catalytic material that can replace platinum.Because electrolyzing water to produce hydrogen in alkaline medium is one of the most convenient methods for industrial production and application at present,synthesis of palladium-based catalysts with high catalytic activity under alkaline conditions is the main objective of this paper.At present,the reported palladium-based materials usually exhibit a strong ability to absorb hydrogen in alkaline media,resulting in a slow reaction kinetics of hydrogen evolution.This paper adopted the borane tert-butylamine complex（BTB）as the reducing agent,with acetylacetone palladium（II）[Pd（acac）₂]as the source of palladium,by using a pan of solvent thermal synthesis of palladium fund phosphide,regulation,through to the material composition and morphology of palladium fund is phosphide in electrochemical stability and catalytic activity of hydrogen evolution reaction were studied.1.In chapter 3,PdP nanoparticles were synthesized with TPP as a phosphorus precursor.The physical characterization results showed that P was successfully embedded in the lattice of Pd,which changed the degree of porosity on the surface of PdP nano-alloy,and the electron interaction between Pd and P further increased the kinetic process of the reaction.After testing the catalytic performance of Pd₃P_0.95 NPs in alkaline media,when the current density is 10 mA cm²,the overpotential generated by Pd₃P_0.95 NPs is 75 mV,which is 185 mV lower than the commercial Pd/C under the same test conditions.Combined with the results of its physical characterization,the mass activity of Pd₃P_0.95 NPs was calculated to be more than twice that of commercial Pd/C,indicating that the PdP nanomaterial may be a potential catalyst for hydrogen production from splitting water.2.In chapter 4,the amorphous Pd-Co-P nano alloy（².4 nm nano particles）showed excellent activity in the process of hydrogen evolution reaction in alkaline environment.Its overpotential was very low at 14 mV,and its Tafel slope was 28 mV dec^-1.According to the results of physical characterization,the mass activity is 1.4 mAμg_Pd^-1,which is 15.6 times higher than commercial Pd/C.Co is not only a good partner for Pd and P to form amorphous alloy,but also can promote the reduction of element P,so that the metal Pd shows more positive electromagnetism in Pd-Co-P alloy.Because of the amorphous structure of ternary amorphous alloy,the positive electron of Pd and the synergistic effect between Pd and Co,these comprehensive factors weaken the adsorption energy of hydrogen and accelerate the dissociation of water.This work provides a new idea for the construction of ternary metal phosphides with amorphous morphology to improve the electrocatalytic performance,indicating that palladium based materials are a promising catalyst for hydrogen production from water cracking.This paper has 24 figures,3 tables and 101 references.