Perovskite oxides are an important and effective class of mixed oxides which play a significant role in the fields of energy storage and conversion systems. Here we present a series of cobaltite perovskite LaCoO₃ particles which have been doped with 0, 5, 10, 20, and 30% of Sr²⁺ and have been synthesized by a combined sol–gel and molten-salt synthesis procedure, which provides a regular morphology of the particles. These Sr²⁺-doped LaCoO₃ particles have been characterized by powder X-ray diffraction, Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. Moreover, these Sr²⁺ doped LaCoO₃ particles have been demonstrated as efficient catalysts for oxygen evolution reaction (OER) based on the measured specific capacitance, total charge, most accessible charge, electrochemically active surface area, and roughness factor using rotating disk and rotating ring-disk electrode techniques. The 30% Sr²⁺-doped LaCoO₃ sample shows enhanced electrocatalytic OER activity in 0.5 M H₂SO₄ media compared to the LaCoO₃ samples doped with 0, 5, 10, and 20% Sr²⁺. Among all five LaCoO₃ samples, the doped LaCoO₃ samples demonstrate better OER activity than the undoped sample.

钙钛矿氧化物是一类重要而有效的混合氧化物，在能量存储和转换系统领域起着重要作用。在这里，我们介绍了一系列钙钛矿型LaCoO ₃粒子，这些粒子掺杂了0、5、10、20和30％的Sr ^2+，并通过溶胶-凝胶和熔融盐合成工艺合成，颗粒的规则形态。这些Sr ²⁺掺杂的LaCoO ₃颗粒已经通过粉末X射线衍射，拉曼光谱，红外光谱，X射线光电子能谱和扫描电子显微镜表征。此外，这些Sr ²⁺掺杂的LaCoO ₃基于使用旋转盘和旋转环盘电极技术测得的比电容，总电荷，最易接近的电荷，电化学活性表面积和粗糙度因子，已证明这些颗粒是用于氧释放反应（OER）的有效催化剂。与掺杂有0、5、10和20％Sr ²⁺的LaCoO ₃样品相比，掺杂30％Sr ^2+的LaCoO ₃样品在0.5 MH ₂ SO ₄介质中显示出增强的电催化OER活性。在所有五个LaCoO ₃样品中，掺杂的LaCoO ₃样品显示出比未掺杂的样品更好的OER活性。