资源环境科技发展态势分析平台

Solid oxide electrolysis cells can theoretically achieve high energy-conversion efficiency, but current density must be further increased to improve the hydrogen production rate, which is essential to realize widespread application. Here, we report a structure technology for solid oxide electrolysis cells to achieve a current density higher than 3鈥堿鈥塩m^鈭?, which exceeds that of state-of-the-art electrolyzers. Bimodal-structured nanocomposite oxygen electrodes are developed where nanometer-scale Sm_0.5Sr_0.5CoO_{3鈭捨?/sub> and Ce0.8Sm0.2O1.9 are highly dispersed and where submicrometer-scale particles form conductive networks with broad pore channels. Such structure is realized by fabricating the electrode structure from the raw powder material stage using spray pyrolysis. The solid oxide electrolysis cells with the nanocomposite electrodes exhibit high current density in steam electrolysis operation (e.g., at 1.3鈥塚), reaching 3.13鈥堿鈥塩m^鈭? at 750鈥壜癈 and 4.08鈥堿鈥塩m^鈭? at 800鈥壜癈, corresponding to a hydrogen production rate of 1.31 and 1.71鈥塋鈥塰^鈭? cm^鈭? respectively.}