Application Of Copper-based Non-noble Metal Compounds/Nano-carbon Composites In Electrocatalysis

With the sustain development of science and technology,the problem of environmental pollution is becoming more and more serious.As the combustion product of hydrogen is only water,and the heat capacity of hydrogen is relatively large,hydrogen as a new energy has a great future,as a consequence that electrolysis of water to hydrogen is regarded as the most promising novel energy.Oxygen evolution reaction?OER?is the bottleneck reaction of water electrolysis.To accelerate OER reaction process,efficient catalysts can be used to promote the forward process of water electrolysis.Currently,OER catalysts commonly used are mainly noble metals such as rhodium and iridium and their oxides.Due to the high price of precious metals as well as low storage in the natural environment,and relatively high production cost,some adverse factors force the search for efficient,accessible and low-cost OER catalysts.At present,some compounds containing transition metals?iron,cobalt,nickel and copper,etc.?or catalysts doped with non-metallic heteroatoms to replace precious metals have attracted wide attention.Carbon nanotubes have been widely used in electrocatalytic OER because of their large specific surface area,good conductivity,and cheap availability.This paper mainly studies the application of copper based non-noble metal/nano carbon composites in electrocatalytic oxygen precipitation.This paper studies from the following two aspects:?1?Nano sized nitrogen-doped cuprous sulfide/carbon nanotubes?CNTs/N-Cu₂S?composites were prepared by electrochemical deposition.SEM,TEM,XPS and other methods were used to characterize the morphology and composition of the materials,which were proved that the nitrogen-doped cuprous sulfide was successfully generated in CNTs.And LSV,EIS,i-t and other electrochemical methods were used to test the properties of the prepared composites.When the current density was 10mA cm^-2,the overpotential was 280 mV and the slope of Tafel was 63mV dec^-1.After 15 hours of stability test in 1MKOH electrolyte,the current density did not significantly attenuate,which is further concluded that the material as OER catalyst achieves excellent catalytic effect and stability in alkaline electrolytes.?2?With sodium copper chlorophyll and mesoporous carbon as raw material,by high temperature annealing Cu_xO/CMK composite material,SEM images proved to have a uniform nano particle material production.Further prove that the new material is copper oxide by XRD and mapping,and so on.The catalysts showed high catalytic activity for OER and ORR?Oxygen Reduction Reaction?in alkaline medium.