We here demonstrate a high efficient phosphorus-iridium (P-Ir) electrocatalyst for oxygen evolution reaction (OER). The P-Ir particles show an atomic ratio of 2:1 (P:Ir) and a highly uniform size of 1.8–3.6 nm (>90%). Compared to the Ir nanoparticles, the present P-Ir catalyst displays higher catalytic activities in acidic, alkaline, and neutral solutions. The P-Ir catalyst only requires an onset-potential of 190 mV for oxygen evolution in the solution of 0.1 M HClO₄. Compared with Ir catalyst, the P-Ir reduces the overpotential ~30 mV to achieve the oxygen-evolution current densities of 10 and 30 mA cm⁻², respectively. Additionally, at an overpotential of 266 mV, P-Ir obtains a mass activity 1.7 times higher than Ir. Importantly, the P-Ir catalyst shows ultrahigh stability in acidic condition. The enhancement in electrocatalysis should be ascribed to the phosphorus introduction. The work demonstrates that the present P-Ir nanocrystals are promising catalysts in electrochemical splitting water in a broad pH range.

我们在这里展示了一种用于氧释放反应（OER）的高效磷铱（P-Ir）电催化剂。P-Ir粒子的原子比为2：1（P：Ir），高度均匀的尺寸为1.8-3.6 nm（> 90％）。与Ir纳米颗粒相比，本发明的P-Ir催化剂在酸性，碱性和中性溶液中显示出更高的催化活性。P-Ir催化剂仅需要190 mV的起始电位才能在0.1 M HClO ₄溶液中释放出氧气。与Ir催化剂相比，P-Ir降低了〜30 mV的过电势，以实现10和30 mA cm ^-2的析氧电流密度， 分别。另外，在266 mV的超电势下，P-Ir获得的质量活度是Ir的1.7倍。重要的是，P-Ir催化剂在酸性条件下显示出超高的稳定性。电催化作用的增强应归因于磷的引入。这项工作表明，目前的P-Ir纳米晶体是在宽pH范围内电化学分解水中有希望的催化剂。