Studies On Electrocatalytic Reduction Of Carbon Dioxide To Formate On Nano-metallic Materials

With the rapid development of industrialization and modern civilization,We have to look to the sustainable development of energy due to a large amount of the energy consumption leading to the environmental issues erupted repeatedly.Carbon dioxide?CO₂?is an important part of C1 chemistry,and is also the most cheap and abundant carbon resource in the family of C1.By using the method of electric catalytic reduction,carbon dioxide can be reduced into formic acid,carbon monoxide,alcohols and hydrocarbon.Then the energy can be stored in the high energy density material to recycle,not only can it alleviate the "greenhouse effect" problem,but also it can reduce the human dependence on fossil fuels.The electrochemical reduction of carbon dioxide?CO₂?is a very gentle and effective method and we can use the energy generated by renewable energy during the reaction process of electrolysis,then it will not cause secondary pollution and be very clean.But there are still many problems of electric catalytic reduction CO₂ technology needing to solve,such as :???improving the current density to short the reaction time,???lowing the overpotential so that the reaction can occur more easily,???increasing the efficiency of current during the process of reaction to reduce side effects,???enhancing the stability of the working electrode and so on.Basing on the above problems,looking forthe new type of catalyst with predominant catalytic activity and high selectivity and at the same time with superior stability is the key to the development of the electric catalytic reduction technology of CO₂.In this work,we obtain the nano-Sn and nano-Bi catalyst by electrochemical deposition method.The detaily comments are as follows:By using the method of constant pressure plating,we has been fabricated nano-tin plating from non-aqueous solution as a catalyst with copper foil as base.This study mainly investigates electrochemical reduction of CO₂ in aqueous solution?0.1 mol/L KHCO₃ solution?.Compared with the traditional copper electrode,this kind of nanometer tin plating electrode has its unique advantages.Electrochemical reduction of CO₂ at the nano-tin electrode has more predominant catalytic activity and higher catalytic current density,and we find higher faraday efficiency at the same time.we has been deposited nano-tin plating from aqueous solution as a catalyst on copper foil and copper wire mesh by using the method of constant current plating.In this research,we mainly investigate electrochemical reduction of CO₂ in aqueous solution?0.1 mol/L KHCO₃solution?.Compared to nano-tin plating from non-aqueous solution,though the current density is slightly lower,it is conducive to transform the gold production of formic acid,we find higher faraday efficiency is92% at-1.8 V Vs.Ag/Ag Cl and the generation rate of formic acid is164.40 ?mol·h-1 on W-Sn/Cu electrode,the faraday efficiency is83.5%.and the generation rate of formic acid is 118 ?mol·h-1 on W-Sn/f-Cu electrode at the same time.We obtain nanometer bismuth film electrode as a catalyst by depositing bismuth on copper foil in situ from aqueous plating solution.we mainly investigate electrochemical reduction of CO₂ in aqueous solution?0.1 mol/L KHCO₃ solution?in this work.Compared with Cu,Ag or Sn electrode,this catalyst has many advantages,such as superior catalytic activity,short time of electrolytic,high catalytic current density and it can lower the electrochemical overpotential.