Preparation Of Nickel-based Electrocatalyst And Study On Hydrogen Evolution Performance

With the decrease of energy storage and the aggravation of environmental pollution,much attention has been paid to the development of various new energy materials or renewable energy resource by many countries in recent years.As a secondary energy,hydrogen is considered as the most ideal energy carrier for its clean,high efficiency,storability and transportability.Among numerous hydrogen production technologies,the production of hydrogen through water splitting is potentially of great importance in solving the energy crisis and environmental problems.Catalysis plays a critical role in the design of efficient processes and systems,which is able to maximized the value of raw materials and minimize the waste generation and energy requirement.At present,noble metal?like Pt?nanoparticles have been proved to possess excellent catalytic activity for hydrogen evolution reaction?HER?.Considering the high cost of Pt,developing new kinds of catalytic materials with high catalytic activity and low cost is in progress.This paper focuses on the study of nickel-based materials.The crystal structures and hydrogen evolution activity of these catalysts were also investigated.The research achievements are listed as follows:1.Ternary nanocatalysts with a small amount of noble metal Pd?⁶% atomic?loaded can be prepared by the simple hydrothermal method.The experimental results show that Ni₃P/Ni-Pd catalyst requires an overpotential of 100 m V to reach a current density of 10 m A · cm-2 under the acidic condition,while requires an overpotential of 160 m V under the alkaline conditions.Therefore,the as-prepared Ni₃P/Ni-Pd is proved as a perfect HER nanocatalyst material.2.A new method to synthesize nickel-cobalt bimetallic phosphide is proposed.The bimetallic hydroxide obtained by a hydrothermal method,then subject to phosphating to obtain Ni Co P nanoflowers,which is highly efficient for electrolysis of seawater.The electrolysis of seawater under acidic conditions requires an overpotential of 81 m V to reach the current density of 10 m A·cm-2.The Ni Co P nanoflower balls also showes excellent HER catalytic activity,and stability under alkaline conditions.This bimetallic phosphide greatly reduces the economic cost of electrolytic water cathode materials.