Jang, Yeju Kim, Hoyoung Park, Dongmin Han, Sunghoon Jun, Hyunwoo Park, Jinkyu Kim, Seongbeen Jung, Yousung Choi, Chang Hyuck Jang, Jong Hyun Lee, Seonggyu Lee, Jinwoo 2025-04-09T08:01:25Z 2025-04-09T08:01:25Z 2025-04-09 2025-04 1613-6810 https://pubs.kist.re.kr/handle/201004/152215 The primary hurdle faced in the practical application of proton exchange membrane water electrolyzer (PEMWE) involves improving the intrinsic kinetic activity of oxygen evolution reaction (OER) electrocatalysts while concurrently enhancing their durability. Although electrocatalysts based on lattice oxygen-mediated mechanism (LOM) have the potential to significantly enhance the activity in OER without being restricted by scaling relationships, they are neglected in acidic electrolytes due to limited durability. In this study, an innovative approach is presented to simultaneously promote the activation of lattice oxygen and improve the durability of LOM-based OER electrocatalysts by incorporating d(0) metal ions into the RuO2 electrocatalyst. Leveraging the unique electronic properties of the d(0) metal ion, the O 2p band center and Ru-O covalency of the electrocatalyst are successfully engineered, resulting in the change in OER mechanism. Furthermore, in a single cell of PEMWE, the LOM-based electrocatalyst demonstrates outstanding performance, achieving 3.0 A cm(-2) at 1.81 V and maintaining durability for 100 h at 200 mA cm(-2), surpassing commercial RuO2. This innovative strategy challenges the traditional viewpoint that suppressing lattice oxygen activation in OER is essential for enhancing PEMWE durability, offering new perspectives for the development of OER electrocatalysts in acidic electrolytes. English Wiley - V C H Verlag GmbbH & Co. Feasibility of Active and Durable Lattice Oxygen-Mediated Oxygen Evolution Electrocatalysts in Proton Exchange Membrane Water Electrolyzers Through d0 Metal Ion Incorporation Article 10.1002/smll.202411374 1 Small, v.21, no.17 Small 21 17 N scie scopus 001455617700001 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ELECTRONIC-STRUCTURE RUTHENIUM OXIDE STABILITY RUO2 ATOM lattice oxygen-mediated mechanism (LOM) metal-oxygen covalency oxygen evolution reaction (OER) proton electrolyte membrane water electrolysis d(0) metal ions