固体氧化物电解池的制备与优化

Preparation and optimization of solid oxide electrolysis cells

固体氧化物电解池(Solid Oxide Electrolysis Cell,SOEC)作为一种高效的能量转化装置,可将富余电力转化为氢能,具有广阔的应用前景。然而在SOEC实际运行中,由于H_(2)O分子体积远大于H_(2)分子,使得H_(2)O分子在传统的阴极结构中的传质效率下降,从而降低电解性能,因此提升水蒸气的传质效率对其性能提升具有重要意义。为提升水蒸气的传质效率,对电池结构进行了专门的设计;采用梯度孔结构的阴极,结合新型空气极材料,以Sc稳定的氧化锆(ScSZ)作为电解质制备得到了大面积SOEC单电池,并以单一孔径结构的阴极单电池作为对照组,对两种结构的阴极单电池的电解性能进行测试表征。结果表明在750℃时相同含量水蒸气下单一孔径阴极单电池的电解性能均低于阶梯孔阴极单电池的电解性能:在750℃@1.3 V-80%H_(2)O下10 cm×10 cm大面积单电池上,前者电解功率为32 W,后者40.2 W,即阶梯孔结构阴极的设计提升了电解性能。

Solid Oxide Electrolysis Cell(SOEC),as an efficient energy conversion device,can convert surplus electricity into hydrogen energy and has broad application prospects.However,in the actual operation of SOEC,due to the much larger volume of H_(2)O molecules,the mass transfer efficiency of H_(2)O molecules in the traditional cathode structure decreases,thereby reducing the electrolysis performance.Therefore,improving the mass transfer efficiency of water vapor is of great significance for its performance improvement.To improve the mass transfer efficiency of water vapor,the structure of cell has been specially designed;A large-area SOEC single cell was prepared using a gradient pore structure cathode,combined with a new air electrode material,and Sc stabilized zirconia(ScSZ)as the electrolyte.A single pore structure cathode single cell was used as the control group,and the electrolytic performance of the two structures of cathode single cells was tested and characterized.The results showed that the electrolysis performance of a single pore cathode single cell was lower than that of a gradient pore cathode single cell under the same content of water vapor at 750℃.The electrolysis power of a large area single cell with a diameter of 10cm x 10cm at 750℃@1.3 V-80%H_(2)O was 32 W for the former and 40.2 W for the latter,indicating that the design of the stepped pore structure cathode improved the electrolysis performance.