Electrocatalytic Reduction Of CO_2 In Pyridine Aqueous Solution Based On Metal Nanoparticle Modified Electrode

Envirommental pollution and energy crisis have become two serious problems that we must face in our society. The rapidly growing of CO2 in atmosphere pose big challenges to human survival environment. How to capture excessive CO2 in atmosphere and tansform it to useful fules not only reduce the increasingly serious environment problems but also satisfy the urgent demand for energy.The intermediates generated in the reaction process can be used in other organic reation for producing medical intermediate. Its product is a liquid form, that let it easy to store and transport safety.Pt、Au electrode have excellent chemical-stable property,wide electrochemical window and mild surface characteristics so that they could be used to study the surface control chemical reaction.Pt-NPs、Au-NPs modified electrode have high surface area,admirable catalytic activity and some special optical performance due to its nano-sized surface structure. In the electrochemical reaction,it can improve the efficiency remarkably.CZTS have a suitable band gape, large absorption coefficient that similar to ideal solar cell materials. So it was used as photocathode in electrochemical reaction.Our work mainly include the following sections:1、Reduction of CO2 by precious metal(Pt、Au)electrode with pyridinium ion as cocatalyst in 0.5M KCl solution. The reduction potential is-0.58 Vvs.SCE. The overpotential and reaction activation energy is reduced in the presence of pyridinium. To a large extent, it also inhibit the impact of hydrogen evolution reaction. The pyridine concentration and p H value were changed to explore its effect on reaction process so we can explore the reaction mechanism preliminarily. We find the reaction process is a transmission electron and H+ to CO2 at the same time on metal elelctrode surface.Mo S2 is a kind of good hydrogen-adsorption material. So we synthesis Mo S2/Au modified electrode to reduction of CO2 and find the current density is increased and the reduction potential is more positive than that on Au electrode.2、We prepared the Pt-NPs/GCE and Au-NPs/GCE modified electrode. We find the Pt-NPs/GCE electrode has good catalytic property for CO2 reduction with pyridinium as cocatalyst by CV and LSV method.It can achieve the same catalytic effect as the Pt electrode only deposite a small amount of Pt nanoparticles.The reduction potential on Au-NPs/GCEelectrode is more negative than it on Pt-NPs/GCEelectrode.3、We prepared Mo/Pt/CZTS/Cd S/Pt and FTO/ Pt/CZTS /Cd S/Pt electrode based on the CZTS material by sol-gel process and find Mo/Pt/CZTS/Cd S/Pt modified elelctrode has good good catalytic property for CO2 reduction with pyridinium as cocatalyst.Analyze the reaction process of photoelectric catalytic reduction of CO2 and compared the property of two different electrodes.We also studied the effect of electrolyte for photoelectric catalytic reduction of CO2 by changing and using differern electrolyte solution and find KCl solution is more suitable than Na2SO4 solution.