Study On The Performance Of Microchanneled Electrode-supporting Solid Oxide Cells

Solid oxide cells(SOC) include solid oxide fuel cells(SOFC) and solid oxide electrolysis cells(SOEC).Among them,SOFC directly converts the chemical energy stored in the fuel gas into electric energy with high efficiency and environmental friendliness,which can greatly alleviate the problems of rapid consumption of traditional energy and serious environmental pollution;while solid oxide electrolysis cells(SOEC) can utilize solar energy.Renewable energy,such as wind energy,generates greenhouse gases such as carbon dioxide,converts it into chemical energy,and stores energy,realizing the storage and utilization of renewable energy.Solid oxide batteries with nickel-based support electrodes are the most common.For SOFC,methane is the most common hydrocarbon fuel gas.It is the main component of natural gas.It has the advantages of abundant reserves,easy storage and low price.The use of CH4 as a fuel is a trend in the future.In addition,the burning of fossil energy now produces a large amount of carbon dioxide emissions,causing serious greenhouse problems such as sea level rise.Therefore,the development of CO2 utilization technology to reduce CO2 emissions has become a hot research topic.However,under the catalysis of Ni,both carbon dioxide and carbon dioxide have carbon deposition problems,which severely limit the performance of the battery.Therefore,it is particularly important to study the carbon deposition resistance of solid oxide battery fuel electrodes.Loading the catalyst by impregnation is one of the most common methods and is popular for its ease of operation.However,the conventional electrode structure cannot satisfy the rapid and uniform loading of the catalyst due to its curved and poorly continuous pores;and methane and carbon dioxide are macromolecular gases,which have high requirements for gas diffusion.Therefore,the pore structure has become the focus of this paper.In this paper,the performance of solid oxide cells was improved by microchannel structure to study the effect of microchannels on the performance of solid oxide cells.First,the microchannel anode supports the study of CH4 utilization of SOFC.Methane-fueled solid oxide fuel cells are expected to achieve high energy conversion efficiencies.The study uses an anode support with a novel microchannel structure that provides a fast gas diffusion pathway.In order to confirm these advantages,an anode having a half channel and no channel was also used for comparison.The microchannel structure reduces or eliminates concentration polarization within the anode carrier and utilizes a catalyst coating on the inner surface of the anode to improve cell polarization resistance,resulting in high and stable methane conversion.Methane conversion efficiency is defined as the power output per mole of methane used to compare with the reported results,and the microchannel SOFC produces the highest recorded methane power generation efficiency.Secondly,the microchannel cathode supports SOEC to study the electrolysis performance of CO2.The impregnation method is an effective way to improve the performance of the porous electrode of a solid oxide cell,and the catalyst preparation procedure and catalyst stability are still challenging.The microchannel structure of the cathode enables the catalyst to be introduced into the Ni-based cathode carrier of the solid oxide electrolysis cell by an infiltration process to accelerate CO2 electrolysis.Catalytic coatings prepared by infiltration of CeO2 colloid precursors have demonstrated more efficient catalyst preparation and more stable CO2 electrolysis performance than catalyst coatings prepared by impregnation of conventional nitrate precursors.Due to the stable catalyst microstructure,the optimization of the infiltration process resulted in a stability of 334 hours of CO2 electrolysis performance during battery operation.In addition,this paper studies the effects of microchannels on methane-hydrocarbon fuel gas-assisted electrolysis carbon dioxide cells.Methane assisted electrolytic carbon dioxide greatly reduces power consumption.Therefore,in the mode of fuel gas-assisted electrolysis of carbon dioxide,giving it a lower voltage can efficiently reduce carbon dioxide.In addition,the oxygen ions generated by the reduction of carbon dioxide react through the electrolyte to the battery anode and the hydrocarbon fuel gas such as methane to generate carbon monoxide and hydrogen synthesis gas.The catalyst is stabilized in this mode by loading the catalyst through the microchannel,and a large amount of syngas is generated,and the selectivity of hydrogen and carbon monoxide is relatively high.