Preparation And Nitrogen Reduction Performance Of Re And Sn Based Sulfide Electrocatalytic Materials

With the increasing population in the world,people’s demand for energy is also increasing dramatically.Due to the use of non renewable energy such as coal,oil,natural gas,nuclear energy and so on,a large number of polluting gases and greenhouse gases will be produced,the environment is increasingly damaged,and the global warming is obviously intensified.In order to solve the above problems,people are committed to the development of renewable clean energy.NH₃ is widely used in chemical fertilizer,plastic,fiber and so on,and ammonia can be used as a fuel to burn without producing any greenhouse gases.It is a new green and renewable energy that people need urgently.Industrial production of ammonia is through Haber Bosch process,but Haber process itself will consume a lot of energy,and produce a lot of greenhouse gases,so people through the way of electrocatalysis,not only save energy,but also can control the start of reaction at any time,more convenient and fast.However,due to the high activity(940.95kJmol^-1)required for the cleavage of N≡N triple bond,it is difficult to directly convert N₂ to NH₃ by electrocatalysis,so it has become the research object to find efficient and durable catalysts.Metal sulfide electrocatalyst has been the main research topic,as a catalyst has good performance and durability,so the selection of metal sulfide electrocatalyst and its nitrogen reduction performance research has become our system content.（1）In this system,we successfully synthesized ReS₂/CC and characterized its morphology and properties,which were used to test the electrocatalytic NRR.In 0.1mol/L HCl,when the potential was-0.4V,the Faraday efficiency reached 0.78%,and the ammonia yield reached3.61×10^-10mols^-1cm^-2,with good catalytic performance and high stability.The characterization of ReS₂/CC after NRR test showed good durability of the catalyst.It is the first time that ReS₂/CC is applied to electrocatalysis of NRR,which provides a new idea for the research and utilization of noble metal catalysts in the future.（2）It was found in（1）that ReS₂/CC has high yield but low Faraday efficiency,because to have high Faraday efficiency,it is necessary not only to inhibit the competitive reaction of nitrogen reduction hydrogen evolution reaction,but also to improve the catalytic performance of NRR.Therefore,through consulting the literature,we know that SN is an element that can inhibit the hydrogen evolution reaction,and Fe is used as the catalyst of Haber process for industrial production of ammonia,In this system,we have successfully synthesized Fe-SnS₂,characterized its morphology and properties,and applied it to electrocatalytic NRR.In 0.1mol/L HCl,when the potential is-0.7V,the Faraday efficiency reaches 10.3%,and the ammonia yield reaches 66.3μgh^-1mg^-1.The Fe-SnS₂ catalyst with good catalytic performance and high stability was characterized after electrocatalytic NRR test,which showed good durability of the catalyst.This is the first time that Fe-SnS₂ has been applied to electrocatalytic NRR,and the idea of improving Faraday efficiency has been successfully confirmed,which provides new ideas and ideas for future research and utilization of catalysts.