Herein we present novel IrO₂ coated TiO₂ core-shell microparticles (IrO₂@TiO₂) as an oxygen evolution reaction catalyst. We compare the IrO₂@TiO₂ catalyst to commercial TiO₂ supported IrO₂ catalyst (IrO₂/TiO₂) and pure IrO₂ catalyst powder. A stability analysis via on-line inductively coupled plasma mass spectrometry based on the S-number, a descriptor considering both energy efficiency and catalyst utilization efficiency, shows that the IrO₂@TiO₂ catalyst shows high potential for practical applications. This was further confirmed by full-cell tests showing superior performance of the IrO₂@TiO₂ catalyst with moderate and low loadings of 1.2 mg_Ir cm^-2 and 0.4 mg_Ir cm^-2, respectively. The core-shell catalyst is synthesized via facile route suitable for large quantities. Moreover, stable inks from the synthesized catalyst powder make this system appealing for large scale manufacturing of cells. Given the facile synthesis route, high activity, and good stability, the IrO₂@TiO₂ catalyst is potentially suitable for industry proton exchange membrane water electrolysis application.

在本文中，我们提出了新颖的IrO ₂包覆的TiO ₂核壳微粒（IrO ₂ @TiO ₂）作为析氧反应催化剂。我们将IrO ₂ @TiO ₂催化剂与商用TiO ₂负载的IrO ₂催化剂（IrO ₂ / TiO ₂）和纯IrO ₂催化剂粉末进行了比较。通过基于S值的在线电感耦合等离子体质谱法（同时考虑能量效率和催化剂利用效率的描述符）进行的稳定性分析表明，IrO ₂ @TiO ₂催化剂在实际应用中显示出很高的潜力。全电池测试进一步证实了这一点，该实验显示出IrO ₂ @TiO ₂催化剂具有优异的性能，中等和低载量分别为1.2 mg _Ir  cm ^-2和0.4 mg _Ir  cm ^-2。核-壳催化剂通过适合大量的简便路线合成。而且，由合成的催化剂粉末制成的稳定油墨使该系统对电池的大规模生产具有吸引力。鉴于合成路线的简便，高活性和良好的稳定性，IrO ₂ @TiO ₂催化剂可能适合工业质子交换膜水电解应用。