The main challenge for the anode electrocatalyst in a polymer electrolyte membrane water electrolyzer (PEMWE) is to maintain activity and stability simultaneously under the corrosive environment. We report a highly active and durable iridium electrocatalyst supported on boron carbide for the oxygen evolution reaction. The physical and electrochemical properties of the catalyst are controlled by changing the synthetic reduction temperature from 30 °C to 100 °C. The prepared Ir/B₄C-100 °C catalyst shows two times higher mass activity than Ir/B₄C-30 °C, even outperforming two commercial catalysts. The improved activity can be correlated to the high concentration of Ir (III) and OH species on the surface and the well-dispersed iridium nanoparticles on the support. Controlling the reduction temperature is also found to enhance iridium stability by developing the interactions between iridium and B₄C. These metal-support interactions inhibit the oxidative dissolution of Ir (III) and the aggregation of iridium species. Ir/B₄C-100 °C also shows better single cell performance than those of two commercial catalysts when tested in a PEMWE. The cell with the synthesized catalyst of Ir/B₄C-100 °C shows a current density of 1.98 A/cm² at 1.8 V, whereas those with two commercial catalysts exhibit values of 1.36 and 0.692 A/cm² at 1.8 V, respectively.

聚合物电解质膜水电解槽（PEMWE）中阳极电催化剂的主要挑战是在腐蚀环境下同时保持活性和稳定性。我们报告了一种以碳化硼为载体的高活性、耐用的铱电催化剂，用于析氧反应。通过将合成还原温度从 30°C 改变到 100°C 来控制催化剂的物理和电化学性能。制备的 Ir/B ₄ C-100 °C 催化剂显示出比 Ir/B ₄高两倍的质量活性C-30 °C，甚至优于两种商业催化剂。提高的活性可能与表面上高浓度的 Ir (III) 和 OH 物质以及载体上分散良好的铱纳米粒子有关。还发现控制还原温度可通过发展铱和 B ₄ C之间的相互作用来增强铱的稳定性。这些金属-载体相互作用抑制了 Ir (III) 的氧化溶解和铱物质的聚集。在 PEMWE 中测试时，Ir/B ₄ C-100 °C 还显示出比两种商业催化剂更好的单电池性能。具有 Ir/B ₄ C-100 °C合成催化剂的电池显示电流密度为 1.98 A/cm ²在 1.8 V 时，而那些使用两种商业催化剂的催化剂在 1.8 V 时分别表现出 1.36 和 0.692 A/cm ^{2 的}值。