The effective utilization of IrO₂ nanoparticles, employed as the anode catalyst for proton exchange membrane water electrolysis (PEMWE), is compromised at low loadings (≤0.1 mg cm⁻²) due to poor in-plane electronic conductivity. Herein, we demonstrate a microporous layer (MPL)-supported catalyst-coated membrane (CCM) where a low-loaded IrO₂ catalyst layer is supported with 0.4 mg cm⁻² Pt black in a bilayer configuration. The MPL-supported CCM configuration is shown to significantly enhance the kinetics, mass transport, and conductivity of low-loaded IrO₂ anodes, achieving performance parity with high-loaded (1 mg cm⁻²) IrO₂ anodes for PEMWE. Stability testing indicates that oxidation of the anode flow plate is the primary source of anode instability. MPL material transfer onto the anode porous transport layer during stability testing precludes reusability of the MPL-supported CCMs, which requires further investigation.

IrO ₂ 纳米粒子用作质子交换膜水电解（PEMWE）阳极催化剂，其有效利用在低负载量（≤0.1 mg cm ⁻² ）下由于性能较差而受到影响。面内电子电导率。在此，我们展示了一种微孔层（MPL）负载的催化剂涂层膜（CCM），其中低负载量的 IrO ₂ 催化剂层负载有 0.4 mg cm ⁻² Pt 黑，双层结构。 MPL 支持的 CCM 配置可显着增强低负载 IrO ₂ 阳极的动力学、传质和电导率，实现与高负载（1 mg cm ⁻² 阳极。稳定性测试表明阳极流板的氧化是阳极不稳定的主要原因。在稳定性测试过程中，MPL 材料转移到阳极多孔传输层上，妨碍了 MPL 支持的 CCM 的可重复使用性，这需要进一步研究。