质子交换膜水电解一体化析氧电极载体催化剂

以氯铱酸为前体,钛网为支撑体,二氧化钛为载体,采用浸渍-热分解法首次成功制备了一体化IrO₂-TiO₂/Ti析氧电极,进一步采用热压法制备膜电极(MEA)。综合扫描电镜(SEM)、循环伏安(CV)、交流阻抗(EIS)以及单池极化曲线测试,研究了载体对于析氧电极形貌以及性能的影响。结果表明:未加入载体二氧化钛的析氧电极表面以裂缝为主,孔隙率较低;而加入载体二氧化钛的析氧电极表面裂纹基本消失,取而代之的是大量的催化剂簇以及孔结构的生成,极大地提高了析氧电极的电催化活性。单池测试表明,电流密度为1000mA/cm²时,添加载体二氧化钛后制备的析氧电极的析氧电位大约是1.70V。

Supported catalysts in integrated oxygen evolution electrode for Proton exchange membrane water electrolysis

Using chloroiridic acid as the precursor, titanium mesh as the substrate and titanium oxide as the support, integrated oxygen evolution electrode of IrO₂-TiO₂/Ti was prepared by thermal decomposition method successfully for the first time. Then a membrane electrode assembly (MEA) was prepared via hot-press. The effects of support on the electrode morphology and performance were investigated by scanning electron microscopy (SEM), cyclic voltammogram (CV), impedance and single cell test. The results showed that the electrode surface was mainly cracks and the porosity was very low. However, the cracks disappeared instead of dense catalyst clusters and pore structure, when the support was added to the oxygen evolution electrode, which improved the catalytic activity of the electrode immensely. The single cell test showed that the voltage was 1.70 V, at 1000mA/cm².