Studies On The Anodic Reaction Mechanism And The Design Of Catalyst For Solar Assisted Indirect Carbon Fuel Cell

Nowadays,the global energy and environmental problems are increasingly prominent,which forces us to consider whether the existing energy utilization mode and energy development mode are really suitable for solving the energy and environmental problems in the world.At present,the energy used by human beings and the way of using it will cause a lot of waste and pollution to the environment.A new technology is urgently needed to improve the current situation.Because the operating temperature required by direct carbon fuel cells is too high,the commercialization of direct carbon fuel cells is very difficult at present,so the solution of stable efficiency is urgently needed.At present,the solution generally focuses on using indirect electric oxidation of carbon to reduce the operating temperature of fuel cells.At operating temperatures close to room temperature,indirect electrooxidation of carbon fuels is used to provide external power to the fuel cell.This type of carbon fuel cell is called indirect carbon fuel cell.The catalytic effect of phosphomolybdic acid on carbon electrooxidation was studied by introducing phosphomolybdic acid into the anode solution of low temperature carbon fuel cell as liquid phase medium.The electrochemical properties of phosphomolybdic acid were studied by cyclic voltammetry.The catalytic effect of phosphomolybdic acid on indirect electrooxidation of carbon was studied by linear scanning voltammetry and timing current method.It was found that Mo in molybdate has the ability to change in the+6 and+1 valence states.Then the linear scanning voltammetry test showed that the+6 valence Mo in molybdate could oxidize the carbon fuel and be reduced to the+5 valence Mo by the carbon fuel.the low-priced phosphomolybdic acid in the phosphomolybdic acid solution can produce electric oxidation on the carbon distribution electrode,generate a certain current density,and be oxidized back to the high-priced phosphomolybdic acid state.This process successfully transfers the electrons originally in the carbon fuel to the electrode,thus completing the indirect electric oxidation of carbon.Introducing a full-cell test of phosphomolybdic acid reacted with different types of biomass carbon fuels under pure sunlight,the discharge performance of light-assisted indirect carbon fuel cells can be compared;the photo-assistance can be observed by adjusting the concentration of the reaction solution or adjusting the flow rate of the liquid.The change of the performance of indirect carbon fuel cells.The overall performance of indirect carbon fuel cells after photocatalysis alone is not as good as that of indirect carbon fuel cells when there is a thermal effect,but the overall gap is small,even at high concentrations of phosphomolybdic acid.Very close to the full battery discharge performance after the introduction of thermal effects.Therefore,the use of photochemical reactions of polyoxometalates（phosphomolybdic acid）to indirectly electro-oxidize carbon fuels can result in stable discharge at low temperatures to achieve the electrical output of light-assisted indirect carbon fuel cells:the most active straw carbon The open-circuit voltage of the indirect carbon fuel cell used as fuel can reach 0.442 V.The highest power density can reach 0.119 m W cm^-2,which illustrates the feasibility of using straw carbon as a green fuel.The straw carbon showed the highest activity in the battery test.The open-circuit voltage of the light-assisted indirect carbon fuel cell can reach 0.366 V.The highest power density can reach 0.138 m W cm^-2 and the battery stability is better than the indirect carbon fuel cell,which directly proves that The feasibility of light-assisted indirect carbon fuel cells and the correctness of the research direction of straw as a green carbon fuel.