Study On The Electroless Depostion Rules And Properties Of Amorphous Ni Base Multielement Alloy Of Low Hydrogen Over-Potential

In electrochemical industry such as fabricating hydrogen,alkali,medicine by electrolysis,the properties of electrolytical electrode is an important question for study,because it can affect the energy consumption , ratio and purity of product,etc.Hydrogen is an important material in chemical industry,and also is high efficient, clean , ideal sencondary energy material .The electrolysis of water is one of the most important means to realize gaining hydrogen cheaply in industry .But there is cathodic polarization during the hydrogen evolution reaction,and the existence of hydrogen over-potential make the needful potential of electrolyser become higher and increase the energy consumption.During the producing alkali by electrolysing NaCl,the energy consumption is only less than that of gaining Al,so in order to decrease the energy consumption ,it is very important to research on the cathodic material of high electrocatalytic activity.And amorphous alloys gained by electroless deposition have excellent physical and chemical properties such as good corrosion resistance, wear resistance and electrocatalytic activity.In this paper,low hydrogen over-potential polybasic alloy electrodes Ni-Co-P,Ni-W-P, and Ni-Co-W-P were prepared by electroless method ,and their physical and chemical properties were studied.The main experiments and their results are as following:1. Ni-Co-P alloy was electroless deposited on the Fe base with our own complxant in weak acid system and the best technology was studied.The component alloy morphology, surface structure of the alloy were measured .The results showed electroless deposition Ni-W-P is amorphous. The experiment of the effect of the factors (complexant ,reducant,[Ni2"h]/[Co2+],etc.)on the deposition rate showed that if the concentrate ratio of Ni2+to Co2+ was higher,the deposition rate was more quick.2. The electrochemical behaviors of Ni-Co-P were studied in NaOH solution as cathodic electrode with cyclic votammertry,polarization curve method etc.,and the result showed that the electrocatalytic properties of hydrogen evolution ofamorphous Ni-Co-P was better than that of Fe and Ni-P.When the alloys were dipped in 5% NaCl for some time , the Ni-Co-P alloy had less pore than Ni-P,and the blue point experiment also proved this .And Ni-Co-P alloy had better corrosion resistance property than Ni-P in different medium.3.Sodium citrate as complexant,the Ni-W-P alloy was electroless deposited The effect of every component in the solution on the electrless deposition Ni-W-P was studied and the surface structure and component of the alloy were measured.We compared X-ray figure of different P content Ni-W-P alloy with that of Ni-P,the result showed that the P content can be much lower than that of Ni-P ,and we can get low P Ni-P base alloy with this method The alloy morphology was not changed after heat-treatment if the temperature was lower than 350癈 and turned into crystal form from amorpholoy if it was higher than 350癈.In the solution of gaining Ni-W-P,Na2WO4 can promote the cathodic and anodic reaction .And Ni-W-P had lower hydrogen over-potential than Ni-P and Ni-Co-P in Imol-L'1 NaOH solution.4.The Ni-Co-W-P alloy was successfully electroless deposited which was nearly not reported and the component, structure, behaviors of hydrogen evolution were studied.We find Ni-Co-W-P alloy electrode had higher electrocatalytic activity than Ni-P,Ni-Co-P,Ni-W-P and it -will be an ideal cathodic material.