| With the rapid development of global economy, the world’s need for energy is increasing. However,air pollution and CO2 greenhouse effect caused by large amount of fossil fuel combustion have been a serious threat to the survival of human. How to effectively reduce the emission of CO2 in order to alleviate the impact of the greenhouse effect will be an unavoidable issue for the global scientific workers. The fixation of carbon dioxide costs too much, and there is a potential damage to the environment. So, more and more countries around the world began to pay attention to the chemical conversion and utilization of CO2.The chemical utilization of carbon dioxide involves two aspects, one is how to obtain the hydrogen source to chemical conversion carbon dioxide, another is how to efficiently activate the inert CO2 molecules. The electrochemical reaction is achieved by the reactant gains and losses electrons on the electrode, without introducing other redox reagents in the reaction system. Reduce the potential pollution caused by chemical reaction to the environment.To solve the above two problems, this paper puts forward the following solutions. Firstly, using the mixed system of ionic liquid and water, solving the solubility of CO2 and the source of hydrogen at the same time. Secondly, synthesis nano composite electrode, using the electrochemical method to activate CO2 and hydrogenation, to achieve the purpose of electrochemical utilize CO2 to generate small organic molecule. To provide a new idea for the green and efficient use of CO2.In this paper, the nano-TiO2/Ti thin film electrode was prepared by anodic oxidation and high temperature treatment on the surface of Ti substrate, with 0.5% HF solution as the electrolyte. And we prepared Pb/nano-TiO2/Ti and Cu/nano-TiO2/Ti composite electrode by electrochemical deposition Pb and Cu on the thin film electrode.XRD, SEM and EDS results shows that the nano-TiO2/Ti thin film electrode surface is anatase TiO2 nanotube arrays. The Pb in the surface of Pb/nano-TiO2/Ti composite electrodes prepared by the constant potential electrodeposition showed large irregular morphology, and Pb in the surface of Pb/nano-TiO2/Ti composite electrode prepared by unipolar pulse electro-deposition showed spherical particles with uniform particle size. The Cu in the surface of Cu/nano-TiO2/Ti composite electrode prepared by unipolar pulse electro-deposition showed cluster distribution.We also research the performance of the electrode materials electrochemical reduction of CO2 in [EMIM][BF4]-H2 O system by cyclic voltammetry(CV). The experimental results show that pure Ti plate has a certain catalytic activity for the hydrogen evolution reaction, but almost no catalytic activity for the electrocatalytic activity of CO2.Nano-TiO2/Ti thin film electrode has a certain effect on the electrochemical reduction of CO2 reaction, the coupling effect of CO2 adsorption electro reduction and hydrogen evolution process was produced by the combination of nano TiO2 and metal Ti plate. The Pb/nano-TiO2/Ti composite electrode prepared by unipolar pulse electro-deposition showed a certain catalytic activity to the electro reduction reaction of CO2. The Cu/nano-TiO2/Ti composite electrode did not show catalytic activity in the test of the electro reduction of CO2 due to the unstable of Cu. |
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