Joo, Jinwhan Park, YeJi Kim, Jun Kwon, Taehyun Jun, Minki Ahn, Docheon Baik, Hionsuck Jang, Jong Hyun Kim, Jin Young Lee, Kwangyeol 2024-01-19T13:02:05Z 2024-01-19T13:02:05Z 2022-01-25 2022-01 2366-9608 https://pubs.kist.re.kr/handle/201004/115876 Designing an efficient and durable electrocatalyst for the sluggish oxygen evolution reaction (OER) at the anode remains the foremost challenge in developing proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable cactus-like nanoparticle with an exposed heterointerface between the IrO2 and the low oxidation state Ru by introducing a trace amount of Mn dopant is reported. The heterostructure fabrication relies on initial mixing of the Ru and Ir phases before electrochemical oxidation to produce a conjoined Ru/IrO2 heterointerface. Benefitting from electron transfer at the heterointerface, the low oxidation state Ru species shows excellent initial activity, which is maintained even after 180 h of continuous OER test. In a half-cell test, the Mn-doped RuIr nanocactus (Mn-RuIr NCT) achieves a mass activity of 1.85 A mg(Ir+Ru)(-1) at 1.48 V-RHE, which is 139-fold higher than that of commercial IrO2. Moreover, the superior electrocatalytic performance of Mn-RuIr NCT in the PEM electrolysis system ensures its viability in practical uses. The results of the excellent catalytic performance for acidic OER indicate that the heterostructuring robust rutile IrO2 and the highly active Ru species with a low oxidation state on the catalyst surface drive a synergistic effect. English WILEY-V C H VERLAG GMBH Mn-Dopant Differentiating the Ru and Ir Oxidation States in Catalytic Oxides Toward Durable Oxygen Evolution Reaction in Acidic Electrolyte Article 10.1002/smtd.202101236 1 Small Methods, v.6, no.1 Small Methods 6 1 N scie scopus 000719618400001 2-s2.0-85119122657 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article STABILITY RUTHENIUM ELECTROCATALYSTS BUBBLES NANOPARTICLES DISSOLUTION MORPHOLOGY PARTICLES EFFICIENT BEHAVIOR heterostructures iridium oxidation states oxygen evolution reaction ruthenium